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/* |
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* %W% %E% |
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* |
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1.7 |
* Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
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* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. |
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*/ |
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package java.util; |
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/** |
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* The {@code Vector} class implements a growable array of |
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1.1 |
* objects. Like an array, it contains components that can be |
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* accessed using an integer index. However, the size of a |
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1.14 |
* {@code Vector} can grow or shrink as needed to accommodate |
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* adding and removing items after the {@code Vector} has been created. |
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* |
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1.9 |
* <p>Each vector tries to optimize storage management by maintaining a |
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1.14 |
* {@code capacity} and a {@code capacityIncrement}. The |
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* {@code capacity} is always at least as large as the vector |
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* size; it is usually larger because as components are added to the |
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* vector, the vector's storage increases in chunks the size of |
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* {@code capacityIncrement}. An application can increase the |
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* capacity of a vector before inserting a large number of |
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1.9 |
* components; this reduces the amount of incremental reallocation. |
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* |
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* <p>The Iterators returned by Vector's iterator and listIterator |
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* methods are <em>fail-fast</em>: if the Vector is structurally modified |
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* at any time after the Iterator is created, in any way except through the |
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* Iterator's own remove or add methods, the Iterator will throw a |
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* ConcurrentModificationException. Thus, in the face of concurrent |
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* modification, the Iterator fails quickly and cleanly, rather than risking |
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* arbitrary, non-deterministic behavior at an undetermined time in the future. |
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* The Enumerations returned by Vector's elements method are <em>not</em> |
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* fail-fast. |
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* |
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* <p>Note that the fail-fast behavior of an iterator cannot be guaranteed |
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* as it is, generally speaking, impossible to make any hard guarantees in the |
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* presence of unsynchronized concurrent modification. Fail-fast iterators |
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* throw {@code ConcurrentModificationException} on a best-effort basis. |
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* Therefore, it would be wrong to write a program that depended on this |
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* exception for its correctness: <i>the fail-fast behavior of iterators |
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* should be used only to detect bugs.</i> |
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* |
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* <p>As of the Java 2 platform v1.2, this class was retrofitted to |
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* implement the {@link List} interface, making it a member of the |
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1.13 |
* <a href="{@docRoot}/../technotes/guides/collections/index.html"> Java |
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1.9 |
* Collections Framework</a>. Unlike the new collection |
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* implementations, {@code Vector} is synchronized. |
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* |
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* @author Lee Boynton |
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* @author Jonathan Payne |
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* @version %I%, %G% |
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* @see Collection |
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* @see List |
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* @see ArrayList |
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* @see LinkedList |
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* @since JDK1.0 |
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*/ |
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public class Vector<E> |
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extends AbstractList<E> |
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implements List<E>, RandomAccess, Cloneable, java.io.Serializable |
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{ |
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/** |
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* The array buffer into which the components of the vector are |
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* stored. The capacity of the vector is the length of this array buffer, |
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* and is at least large enough to contain all the vector's elements. |
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* |
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* <p>Any array elements following the last element in the Vector are null. |
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* |
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* @serial |
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*/ |
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protected Object[] elementData; |
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/** |
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* The number of valid components in this {@code Vector} object. |
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* Components {@code elementData[0]} through |
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* {@code elementData[elementCount-1]} are the actual items. |
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* |
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* @serial |
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*/ |
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protected int elementCount; |
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/** |
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* The amount by which the capacity of the vector is automatically |
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* incremented when its size becomes greater than its capacity. If |
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* the capacity increment is less than or equal to zero, the capacity |
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* of the vector is doubled each time it needs to grow. |
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* |
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* @serial |
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*/ |
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protected int capacityIncrement; |
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/** use serialVersionUID from JDK 1.0.2 for interoperability */ |
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private static final long serialVersionUID = -2767605614048989439L; |
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/** |
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* Constructs an empty vector with the specified initial capacity and |
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* capacity increment. |
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* |
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* @param initialCapacity the initial capacity of the vector |
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* @param capacityIncrement the amount by which the capacity is |
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* increased when the vector overflows |
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* @throws IllegalArgumentException if the specified initial capacity |
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* is negative |
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*/ |
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public Vector(int initialCapacity, int capacityIncrement) { |
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super(); |
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if (initialCapacity < 0) |
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throw new IllegalArgumentException("Illegal Capacity: "+ |
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initialCapacity); |
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this.elementData = new Object[initialCapacity]; |
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this.capacityIncrement = capacityIncrement; |
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} |
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/** |
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* Constructs an empty vector with the specified initial capacity and |
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* with its capacity increment equal to zero. |
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* |
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* @param initialCapacity the initial capacity of the vector |
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* @throws IllegalArgumentException if the specified initial capacity |
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* is negative |
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*/ |
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public Vector(int initialCapacity) { |
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this(initialCapacity, 0); |
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} |
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/** |
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* Constructs an empty vector so that its internal data array |
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* has size {@code 10} and its standard capacity increment is |
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* zero. |
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*/ |
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public Vector() { |
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this(10); |
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} |
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/** |
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* Constructs a vector containing the elements of the specified |
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* collection, in the order they are returned by the collection's |
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* iterator. |
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* |
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* @param c the collection whose elements are to be placed into this |
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* vector |
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* @throws NullPointerException if the specified collection is null |
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* @since 1.2 |
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*/ |
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public Vector(Collection<? extends E> c) { |
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1.6 |
elementData = c.toArray(); |
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elementCount = elementData.length; |
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// c.toArray might (incorrectly) not return Object[] (see 6260652) |
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if (elementData.getClass() != Object[].class) |
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elementData = Arrays.copyOf(elementData, elementCount, Object[].class); |
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} |
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/** |
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* Copies the components of this vector into the specified array. |
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* The item at index {@code k} in this vector is copied into |
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* component {@code k} of {@code anArray}. |
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* |
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* @param anArray the array into which the components get copied |
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* @throws NullPointerException if the given array is null |
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* @throws IndexOutOfBoundsException if the specified array is not |
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* large enough to hold all the components of this vector |
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* @throws ArrayStoreException if a component of this vector is not of |
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* a runtime type that can be stored in the specified array |
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* @see #toArray(Object[]) |
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*/ |
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public synchronized void copyInto(Object[] anArray) { |
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System.arraycopy(elementData, 0, anArray, 0, elementCount); |
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} |
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/** |
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* Trims the capacity of this vector to be the vector's current |
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* size. If the capacity of this vector is larger than its current |
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* size, then the capacity is changed to equal the size by replacing |
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1.14 |
* its internal data array, kept in the field {@code elementData}, |
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1.1 |
* with a smaller one. An application can use this operation to |
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* minimize the storage of a vector. |
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*/ |
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public synchronized void trimToSize() { |
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modCount++; |
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int oldCapacity = elementData.length; |
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if (elementCount < oldCapacity) { |
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elementData = Arrays.copyOf(elementData, elementCount); |
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} |
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} |
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/** |
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* Increases the capacity of this vector, if necessary, to ensure |
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* that it can hold at least the number of components specified by |
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* the minimum capacity argument. |
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* |
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* <p>If the current capacity of this vector is less than |
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1.14 |
* {@code minCapacity}, then its capacity is increased by replacing its |
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* internal data array, kept in the field {@code elementData}, with a |
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1.1 |
* larger one. The size of the new data array will be the old size plus |
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1.14 |
* {@code capacityIncrement}, unless the value of |
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* {@code capacityIncrement} is less than or equal to zero, in which case |
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1.1 |
* the new capacity will be twice the old capacity; but if this new size |
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1.14 |
* is still smaller than {@code minCapacity}, then the new capacity will |
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* be {@code minCapacity}. |
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1.1 |
* |
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* @param minCapacity the desired minimum capacity |
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*/ |
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public synchronized void ensureCapacity(int minCapacity) { |
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modCount++; |
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ensureCapacityHelper(minCapacity); |
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} |
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/** |
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* This implements the unsynchronized semantics of ensureCapacity. |
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* Synchronized methods in this class can internally call this |
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* method for ensuring capacity without incurring the cost of an |
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* extra synchronization. |
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* |
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jsr166 |
1.15 |
* @see #ensureCapacity(int) |
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1.1 |
*/ |
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private void ensureCapacityHelper(int minCapacity) { |
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int oldCapacity = elementData.length; |
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if (minCapacity > oldCapacity) { |
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Object[] oldData = elementData; |
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int newCapacity = (capacityIncrement > 0) ? |
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(oldCapacity + capacityIncrement) : (oldCapacity * 2); |
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if (newCapacity < minCapacity) { |
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newCapacity = minCapacity; |
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} |
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elementData = Arrays.copyOf(elementData, newCapacity); |
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} |
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} |
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/** |
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* Sets the size of this vector. If the new size is greater than the |
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jsr166 |
1.14 |
* current size, new {@code null} items are added to the end of |
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1.1 |
* the vector. If the new size is less than the current size, all |
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jsr166 |
1.14 |
* components at index {@code newSize} and greater are discarded. |
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1.1 |
* |
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jsr166 |
1.16 |
* @param newSize the new size of this vector |
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* @throws ArrayIndexOutOfBoundsException if the new size is negative |
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1.1 |
*/ |
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public synchronized void setSize(int newSize) { |
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modCount++; |
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if (newSize > elementCount) { |
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ensureCapacityHelper(newSize); |
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} else { |
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for (int i = newSize ; i < elementCount ; i++) { |
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elementData[i] = null; |
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} |
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} |
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elementCount = newSize; |
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} |
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/** |
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* Returns the current capacity of this vector. |
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* |
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* @return the current capacity (the length of its internal |
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jsr166 |
1.14 |
* data array, kept in the field {@code elementData} |
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1.1 |
* of this vector) |
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*/ |
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public synchronized int capacity() { |
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return elementData.length; |
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} |
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/** |
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* Returns the number of components in this vector. |
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* |
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* @return the number of components in this vector |
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*/ |
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public synchronized int size() { |
268 |
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return elementCount; |
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} |
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/** |
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* Tests if this vector has no components. |
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* |
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jsr166 |
1.14 |
* @return {@code true} if and only if this vector has |
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1.1 |
* no components, that is, its size is zero; |
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jsr166 |
1.14 |
* {@code false} otherwise. |
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1.1 |
*/ |
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public synchronized boolean isEmpty() { |
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return elementCount == 0; |
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} |
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/** |
283 |
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* Returns an enumeration of the components of this vector. The |
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jsr166 |
1.14 |
* returned {@code Enumeration} object will generate all items in |
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* this vector. The first item generated is the item at index {@code 0}, |
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* then the item at index {@code 1}, and so on. |
287 |
dl |
1.1 |
* |
288 |
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* @return an enumeration of the components of this vector |
289 |
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* @see Iterator |
290 |
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*/ |
291 |
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public Enumeration<E> elements() { |
292 |
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return new Enumeration<E>() { |
293 |
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int count = 0; |
294 |
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295 |
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public boolean hasMoreElements() { |
296 |
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return count < elementCount; |
297 |
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} |
298 |
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299 |
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public E nextElement() { |
300 |
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synchronized (Vector.this) { |
301 |
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if (count < elementCount) { |
302 |
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return (E)elementData[count++]; |
303 |
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} |
304 |
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} |
305 |
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throw new NoSuchElementException("Vector Enumeration"); |
306 |
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} |
307 |
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}; |
308 |
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} |
309 |
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310 |
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/** |
311 |
jsr166 |
1.14 |
* Returns {@code true} if this vector contains the specified element. |
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* More formally, returns {@code true} if and only if this vector |
313 |
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* contains at least one element {@code e} such that |
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dl |
1.1 |
* <tt>(o==null ? e==null : o.equals(e))</tt>. |
315 |
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* |
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* @param o element whose presence in this vector is to be tested |
317 |
jsr166 |
1.14 |
* @return {@code true} if this vector contains the specified element |
318 |
dl |
1.1 |
*/ |
319 |
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public boolean contains(Object o) { |
320 |
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return indexOf(o, 0) >= 0; |
321 |
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} |
322 |
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323 |
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/** |
324 |
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* Returns the index of the first occurrence of the specified element |
325 |
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* in this vector, or -1 if this vector does not contain the element. |
326 |
jsr166 |
1.14 |
* More formally, returns the lowest index {@code i} such that |
327 |
dl |
1.1 |
* <tt>(o==null ? get(i)==null : o.equals(get(i)))</tt>, |
328 |
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* or -1 if there is no such index. |
329 |
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* |
330 |
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* @param o element to search for |
331 |
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* @return the index of the first occurrence of the specified element in |
332 |
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* this vector, or -1 if this vector does not contain the element |
333 |
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*/ |
334 |
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public int indexOf(Object o) { |
335 |
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return indexOf(o, 0); |
336 |
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} |
337 |
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338 |
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/** |
339 |
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* Returns the index of the first occurrence of the specified element in |
340 |
jsr166 |
1.14 |
* this vector, searching forwards from {@code index}, or returns -1 if |
341 |
dl |
1.1 |
* the element is not found. |
342 |
jsr166 |
1.14 |
* More formally, returns the lowest index {@code i} such that |
343 |
dl |
1.1 |
* <tt>(i >= index && (o==null ? get(i)==null : o.equals(get(i))))</tt>, |
344 |
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* or -1 if there is no such index. |
345 |
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* |
346 |
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* @param o element to search for |
347 |
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* @param index index to start searching from |
348 |
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* @return the index of the first occurrence of the element in |
349 |
jsr166 |
1.14 |
* this vector at position {@code index} or later in the vector; |
350 |
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* {@code -1} if the element is not found. |
351 |
dl |
1.1 |
* @throws IndexOutOfBoundsException if the specified index is negative |
352 |
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* @see Object#equals(Object) |
353 |
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*/ |
354 |
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public synchronized int indexOf(Object o, int index) { |
355 |
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if (o == null) { |
356 |
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for (int i = index ; i < elementCount ; i++) |
357 |
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if (elementData[i]==null) |
358 |
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return i; |
359 |
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} else { |
360 |
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for (int i = index ; i < elementCount ; i++) |
361 |
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if (o.equals(elementData[i])) |
362 |
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return i; |
363 |
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} |
364 |
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return -1; |
365 |
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} |
366 |
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367 |
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/** |
368 |
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* Returns the index of the last occurrence of the specified element |
369 |
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* in this vector, or -1 if this vector does not contain the element. |
370 |
jsr166 |
1.14 |
* More formally, returns the highest index {@code i} such that |
371 |
dl |
1.1 |
* <tt>(o==null ? get(i)==null : o.equals(get(i)))</tt>, |
372 |
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* or -1 if there is no such index. |
373 |
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* |
374 |
|
|
* @param o element to search for |
375 |
|
|
* @return the index of the last occurrence of the specified element in |
376 |
|
|
* this vector, or -1 if this vector does not contain the element |
377 |
|
|
*/ |
378 |
|
|
public synchronized int lastIndexOf(Object o) { |
379 |
|
|
return lastIndexOf(o, elementCount-1); |
380 |
|
|
} |
381 |
|
|
|
382 |
|
|
/** |
383 |
|
|
* Returns the index of the last occurrence of the specified element in |
384 |
jsr166 |
1.14 |
* this vector, searching backwards from {@code index}, or returns -1 if |
385 |
dl |
1.1 |
* the element is not found. |
386 |
jsr166 |
1.14 |
* More formally, returns the highest index {@code i} such that |
387 |
dl |
1.1 |
* <tt>(i <= index && (o==null ? get(i)==null : o.equals(get(i))))</tt>, |
388 |
|
|
* or -1 if there is no such index. |
389 |
|
|
* |
390 |
|
|
* @param o element to search for |
391 |
|
|
* @param index index to start searching backwards from |
392 |
|
|
* @return the index of the last occurrence of the element at position |
393 |
jsr166 |
1.14 |
* less than or equal to {@code index} in this vector; |
394 |
dl |
1.1 |
* -1 if the element is not found. |
395 |
|
|
* @throws IndexOutOfBoundsException if the specified index is greater |
396 |
|
|
* than or equal to the current size of this vector |
397 |
|
|
*/ |
398 |
|
|
public synchronized int lastIndexOf(Object o, int index) { |
399 |
|
|
if (index >= elementCount) |
400 |
|
|
throw new IndexOutOfBoundsException(index + " >= "+ elementCount); |
401 |
|
|
|
402 |
|
|
if (o == null) { |
403 |
|
|
for (int i = index; i >= 0; i--) |
404 |
|
|
if (elementData[i]==null) |
405 |
|
|
return i; |
406 |
|
|
} else { |
407 |
|
|
for (int i = index; i >= 0; i--) |
408 |
|
|
if (o.equals(elementData[i])) |
409 |
|
|
return i; |
410 |
|
|
} |
411 |
|
|
return -1; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
/** |
415 |
jsr166 |
1.15 |
* Returns the component at the specified index. |
416 |
dl |
1.1 |
* |
417 |
jsr166 |
1.15 |
* <p>This method is identical in functionality to the {@link #get(int)} |
418 |
|
|
* method (which is part of the {@link List} interface). |
419 |
dl |
1.1 |
* |
420 |
|
|
* @param index an index into this vector |
421 |
|
|
* @return the component at the specified index |
422 |
jsr166 |
1.15 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
423 |
|
|
* ({@code index < 0 || index >= size()}) |
424 |
dl |
1.1 |
*/ |
425 |
|
|
public synchronized E elementAt(int index) { |
426 |
|
|
if (index >= elementCount) { |
427 |
|
|
throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount); |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
return (E)elementData[index]; |
431 |
|
|
} |
432 |
|
|
|
433 |
|
|
/** |
434 |
jsr166 |
1.14 |
* Returns the first component (the item at index {@code 0}) of |
435 |
dl |
1.1 |
* this vector. |
436 |
|
|
* |
437 |
|
|
* @return the first component of this vector |
438 |
jsr166 |
1.15 |
* @throws NoSuchElementException if this vector has no components |
439 |
dl |
1.1 |
*/ |
440 |
|
|
public synchronized E firstElement() { |
441 |
|
|
if (elementCount == 0) { |
442 |
|
|
throw new NoSuchElementException(); |
443 |
|
|
} |
444 |
|
|
return (E)elementData[0]; |
445 |
|
|
} |
446 |
|
|
|
447 |
|
|
/** |
448 |
|
|
* Returns the last component of the vector. |
449 |
|
|
* |
450 |
|
|
* @return the last component of the vector, i.e., the component at index |
451 |
|
|
* <code>size() - 1</code>. |
452 |
jsr166 |
1.15 |
* @throws NoSuchElementException if this vector is empty |
453 |
dl |
1.1 |
*/ |
454 |
|
|
public synchronized E lastElement() { |
455 |
|
|
if (elementCount == 0) { |
456 |
|
|
throw new NoSuchElementException(); |
457 |
|
|
} |
458 |
|
|
return (E)elementData[elementCount - 1]; |
459 |
|
|
} |
460 |
|
|
|
461 |
|
|
/** |
462 |
jsr166 |
1.14 |
* Sets the component at the specified {@code index} of this |
463 |
dl |
1.1 |
* vector to be the specified object. The previous component at that |
464 |
jsr166 |
1.16 |
* position is discarded. |
465 |
dl |
1.1 |
* |
466 |
jsr166 |
1.16 |
* <p>The index must be a value greater than or equal to {@code 0} |
467 |
|
|
* and less than the current size of the vector. |
468 |
dl |
1.1 |
* |
469 |
jsr166 |
1.17 |
* <p>This method is identical in functionality to the |
470 |
|
|
* {@link #set(int, Object) set(int, E)} |
471 |
|
|
* method (which is part of the {@link List} interface). Note that the |
472 |
|
|
* {@code set} method reverses the order of the parameters, to more closely |
473 |
|
|
* match array usage. Note also that the {@code set} method returns the |
474 |
|
|
* old value that was stored at the specified position. |
475 |
dl |
1.1 |
* |
476 |
|
|
* @param obj what the component is to be set to |
477 |
|
|
* @param index the specified index |
478 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
479 |
|
|
* ({@code index < 0 || index >= size()}) |
480 |
dl |
1.1 |
*/ |
481 |
|
|
public synchronized void setElementAt(E obj, int index) { |
482 |
|
|
if (index >= elementCount) { |
483 |
|
|
throw new ArrayIndexOutOfBoundsException(index + " >= " + |
484 |
|
|
elementCount); |
485 |
|
|
} |
486 |
|
|
elementData[index] = obj; |
487 |
|
|
} |
488 |
|
|
|
489 |
|
|
/** |
490 |
|
|
* Deletes the component at the specified index. Each component in |
491 |
|
|
* this vector with an index greater or equal to the specified |
492 |
jsr166 |
1.14 |
* {@code index} is shifted downward to have an index one |
493 |
dl |
1.1 |
* smaller than the value it had previously. The size of this vector |
494 |
jsr166 |
1.15 |
* is decreased by {@code 1}. |
495 |
dl |
1.1 |
* |
496 |
jsr166 |
1.15 |
* <p>The index must be a value greater than or equal to {@code 0} |
497 |
|
|
* and less than the current size of the vector. |
498 |
dl |
1.1 |
* |
499 |
jsr166 |
1.17 |
* <p>This method is identical in functionality to the {@link #remove(int)} |
500 |
|
|
* method (which is part of the {@link List} interface). Note that the |
501 |
|
|
* {@code remove} method returns the old value that was stored at the |
502 |
|
|
* specified position. |
503 |
dl |
1.1 |
* |
504 |
|
|
* @param index the index of the object to remove |
505 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
506 |
|
|
* ({@code index < 0 || index >= size()}) |
507 |
dl |
1.1 |
*/ |
508 |
|
|
public synchronized void removeElementAt(int index) { |
509 |
|
|
modCount++; |
510 |
|
|
if (index >= elementCount) { |
511 |
|
|
throw new ArrayIndexOutOfBoundsException(index + " >= " + |
512 |
|
|
elementCount); |
513 |
|
|
} |
514 |
|
|
else if (index < 0) { |
515 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
516 |
|
|
} |
517 |
|
|
int j = elementCount - index - 1; |
518 |
|
|
if (j > 0) { |
519 |
|
|
System.arraycopy(elementData, index + 1, elementData, index, j); |
520 |
|
|
} |
521 |
|
|
elementCount--; |
522 |
|
|
elementData[elementCount] = null; /* to let gc do its work */ |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
/** |
526 |
|
|
* Inserts the specified object as a component in this vector at the |
527 |
jsr166 |
1.14 |
* specified {@code index}. Each component in this vector with |
528 |
|
|
* an index greater or equal to the specified {@code index} is |
529 |
dl |
1.1 |
* shifted upward to have an index one greater than the value it had |
530 |
jsr166 |
1.15 |
* previously. |
531 |
dl |
1.1 |
* |
532 |
jsr166 |
1.15 |
* <p>The index must be a value greater than or equal to {@code 0} |
533 |
dl |
1.1 |
* and less than or equal to the current size of the vector. (If the |
534 |
|
|
* index is equal to the current size of the vector, the new element |
535 |
jsr166 |
1.15 |
* is appended to the Vector.) |
536 |
dl |
1.1 |
* |
537 |
jsr166 |
1.17 |
* <p>This method is identical in functionality to the |
538 |
|
|
* {@link #add(int, Object) add(int, E)} |
539 |
|
|
* method (which is part of the {@link List} interface). Note that the |
540 |
|
|
* {@code add} method reverses the order of the parameters, to more closely |
541 |
|
|
* match array usage. |
542 |
dl |
1.1 |
* |
543 |
|
|
* @param obj the component to insert |
544 |
|
|
* @param index where to insert the new component |
545 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
546 |
|
|
* ({@code index < 0 || index > size()}) |
547 |
dl |
1.1 |
*/ |
548 |
|
|
public synchronized void insertElementAt(E obj, int index) { |
549 |
|
|
modCount++; |
550 |
|
|
if (index > elementCount) { |
551 |
|
|
throw new ArrayIndexOutOfBoundsException(index |
552 |
|
|
+ " > " + elementCount); |
553 |
|
|
} |
554 |
|
|
ensureCapacityHelper(elementCount + 1); |
555 |
|
|
System.arraycopy(elementData, index, elementData, index + 1, elementCount - index); |
556 |
|
|
elementData[index] = obj; |
557 |
|
|
elementCount++; |
558 |
|
|
} |
559 |
|
|
|
560 |
|
|
/** |
561 |
|
|
* Adds the specified component to the end of this vector, |
562 |
|
|
* increasing its size by one. The capacity of this vector is |
563 |
jsr166 |
1.16 |
* increased if its size becomes greater than its capacity. |
564 |
dl |
1.1 |
* |
565 |
jsr166 |
1.17 |
* <p>This method is identical in functionality to the |
566 |
jsr166 |
1.18 |
* {@link #add(Object) add(E)} |
567 |
|
|
* method (which is part of the {@link List} interface). |
568 |
dl |
1.1 |
* |
569 |
|
|
* @param obj the component to be added |
570 |
|
|
*/ |
571 |
|
|
public synchronized void addElement(E obj) { |
572 |
|
|
modCount++; |
573 |
|
|
ensureCapacityHelper(elementCount + 1); |
574 |
|
|
elementData[elementCount++] = obj; |
575 |
|
|
} |
576 |
|
|
|
577 |
|
|
/** |
578 |
|
|
* Removes the first (lowest-indexed) occurrence of the argument |
579 |
|
|
* from this vector. If the object is found in this vector, each |
580 |
|
|
* component in the vector with an index greater or equal to the |
581 |
|
|
* object's index is shifted downward to have an index one smaller |
582 |
jsr166 |
1.16 |
* than the value it had previously. |
583 |
dl |
1.1 |
* |
584 |
jsr166 |
1.18 |
* <p>This method is identical in functionality to the |
585 |
|
|
* {@link #remove(Object)} method (which is part of the |
586 |
|
|
* {@link List} interface). |
587 |
dl |
1.1 |
* |
588 |
|
|
* @param obj the component to be removed |
589 |
jsr166 |
1.14 |
* @return {@code true} if the argument was a component of this |
590 |
|
|
* vector; {@code false} otherwise. |
591 |
dl |
1.1 |
*/ |
592 |
|
|
public synchronized boolean removeElement(Object obj) { |
593 |
|
|
modCount++; |
594 |
|
|
int i = indexOf(obj); |
595 |
|
|
if (i >= 0) { |
596 |
|
|
removeElementAt(i); |
597 |
|
|
return true; |
598 |
|
|
} |
599 |
|
|
return false; |
600 |
|
|
} |
601 |
|
|
|
602 |
|
|
/** |
603 |
jsr166 |
1.17 |
* Removes all components from this vector and sets its size to zero. |
604 |
dl |
1.1 |
* |
605 |
jsr166 |
1.17 |
* <p>This method is identical in functionality to the {@link #clear} |
606 |
|
|
* method (which is part of the {@link List} interface). |
607 |
dl |
1.1 |
*/ |
608 |
|
|
public synchronized void removeAllElements() { |
609 |
|
|
modCount++; |
610 |
|
|
// Let gc do its work |
611 |
|
|
for (int i = 0; i < elementCount; i++) |
612 |
|
|
elementData[i] = null; |
613 |
|
|
|
614 |
|
|
elementCount = 0; |
615 |
|
|
} |
616 |
|
|
|
617 |
|
|
/** |
618 |
|
|
* Returns a clone of this vector. The copy will contain a |
619 |
|
|
* reference to a clone of the internal data array, not a reference |
620 |
jsr166 |
1.14 |
* to the original internal data array of this {@code Vector} object. |
621 |
dl |
1.1 |
* |
622 |
|
|
* @return a clone of this vector |
623 |
|
|
*/ |
624 |
|
|
public synchronized Object clone() { |
625 |
|
|
try { |
626 |
|
|
Vector<E> v = (Vector<E>) super.clone(); |
627 |
|
|
v.elementData = Arrays.copyOf(elementData, elementCount); |
628 |
|
|
v.modCount = 0; |
629 |
|
|
return v; |
630 |
|
|
} catch (CloneNotSupportedException e) { |
631 |
|
|
// this shouldn't happen, since we are Cloneable |
632 |
|
|
throw new InternalError(); |
633 |
|
|
} |
634 |
|
|
} |
635 |
|
|
|
636 |
|
|
/** |
637 |
|
|
* Returns an array containing all of the elements in this Vector |
638 |
|
|
* in the correct order. |
639 |
|
|
* |
640 |
|
|
* @since 1.2 |
641 |
|
|
*/ |
642 |
|
|
public synchronized Object[] toArray() { |
643 |
|
|
return Arrays.copyOf(elementData, elementCount); |
644 |
|
|
} |
645 |
|
|
|
646 |
|
|
/** |
647 |
|
|
* Returns an array containing all of the elements in this Vector in the |
648 |
|
|
* correct order; the runtime type of the returned array is that of the |
649 |
|
|
* specified array. If the Vector fits in the specified array, it is |
650 |
|
|
* returned therein. Otherwise, a new array is allocated with the runtime |
651 |
jsr166 |
1.16 |
* type of the specified array and the size of this Vector. |
652 |
dl |
1.1 |
* |
653 |
jsr166 |
1.16 |
* <p>If the Vector fits in the specified array with room to spare |
654 |
dl |
1.1 |
* (i.e., the array has more elements than the Vector), |
655 |
|
|
* the element in the array immediately following the end of the |
656 |
|
|
* Vector is set to null. (This is useful in determining the length |
657 |
|
|
* of the Vector <em>only</em> if the caller knows that the Vector |
658 |
|
|
* does not contain any null elements.) |
659 |
|
|
* |
660 |
|
|
* @param a the array into which the elements of the Vector are to |
661 |
|
|
* be stored, if it is big enough; otherwise, a new array of the |
662 |
|
|
* same runtime type is allocated for this purpose. |
663 |
|
|
* @return an array containing the elements of the Vector |
664 |
jsr166 |
1.17 |
* @throws ArrayStoreException if the runtime type of a is not a supertype |
665 |
dl |
1.1 |
* of the runtime type of every element in this Vector |
666 |
|
|
* @throws NullPointerException if the given array is null |
667 |
|
|
* @since 1.2 |
668 |
|
|
*/ |
669 |
|
|
public synchronized <T> T[] toArray(T[] a) { |
670 |
|
|
if (a.length < elementCount) |
671 |
|
|
return (T[]) Arrays.copyOf(elementData, elementCount, a.getClass()); |
672 |
|
|
|
673 |
|
|
System.arraycopy(elementData, 0, a, 0, elementCount); |
674 |
|
|
|
675 |
|
|
if (a.length > elementCount) |
676 |
|
|
a[elementCount] = null; |
677 |
|
|
|
678 |
|
|
return a; |
679 |
|
|
} |
680 |
|
|
|
681 |
|
|
// Positional Access Operations |
682 |
|
|
|
683 |
|
|
/** |
684 |
|
|
* Returns the element at the specified position in this Vector. |
685 |
|
|
* |
686 |
|
|
* @param index index of the element to return |
687 |
|
|
* @return object at the specified index |
688 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
689 |
|
|
* ({@code index < 0 || index >= size()}) |
690 |
dl |
1.1 |
* @since 1.2 |
691 |
|
|
*/ |
692 |
|
|
public synchronized E get(int index) { |
693 |
|
|
if (index >= elementCount) |
694 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
695 |
|
|
|
696 |
|
|
return (E)elementData[index]; |
697 |
|
|
} |
698 |
|
|
|
699 |
|
|
/** |
700 |
|
|
* Replaces the element at the specified position in this Vector with the |
701 |
|
|
* specified element. |
702 |
|
|
* |
703 |
|
|
* @param index index of the element to replace |
704 |
|
|
* @param element element to be stored at the specified position |
705 |
|
|
* @return the element previously at the specified position |
706 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
707 |
|
|
* ({@code index < 0 || index >= size()}) |
708 |
dl |
1.1 |
* @since 1.2 |
709 |
|
|
*/ |
710 |
|
|
public synchronized E set(int index, E element) { |
711 |
|
|
if (index >= elementCount) |
712 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
713 |
|
|
|
714 |
|
|
Object oldValue = elementData[index]; |
715 |
|
|
elementData[index] = element; |
716 |
|
|
return (E)oldValue; |
717 |
|
|
} |
718 |
|
|
|
719 |
|
|
/** |
720 |
|
|
* Appends the specified element to the end of this Vector. |
721 |
|
|
* |
722 |
|
|
* @param e element to be appended to this Vector |
723 |
jsr166 |
1.14 |
* @return {@code true} (as specified by {@link Collection#add}) |
724 |
dl |
1.1 |
* @since 1.2 |
725 |
|
|
*/ |
726 |
|
|
public synchronized boolean add(E e) { |
727 |
|
|
modCount++; |
728 |
|
|
ensureCapacityHelper(elementCount + 1); |
729 |
|
|
elementData[elementCount++] = e; |
730 |
|
|
return true; |
731 |
|
|
} |
732 |
|
|
|
733 |
|
|
/** |
734 |
|
|
* Removes the first occurrence of the specified element in this Vector |
735 |
|
|
* If the Vector does not contain the element, it is unchanged. More |
736 |
|
|
* formally, removes the element with the lowest index i such that |
737 |
jsr166 |
1.14 |
* {@code (o==null ? get(i)==null : o.equals(get(i)))} (if such |
738 |
dl |
1.1 |
* an element exists). |
739 |
|
|
* |
740 |
|
|
* @param o element to be removed from this Vector, if present |
741 |
|
|
* @return true if the Vector contained the specified element |
742 |
|
|
* @since 1.2 |
743 |
|
|
*/ |
744 |
|
|
public boolean remove(Object o) { |
745 |
|
|
return removeElement(o); |
746 |
|
|
} |
747 |
|
|
|
748 |
|
|
/** |
749 |
|
|
* Inserts the specified element at the specified position in this Vector. |
750 |
|
|
* Shifts the element currently at that position (if any) and any |
751 |
|
|
* subsequent elements to the right (adds one to their indices). |
752 |
|
|
* |
753 |
|
|
* @param index index at which the specified element is to be inserted |
754 |
|
|
* @param element element to be inserted |
755 |
jsr166 |
1.17 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
756 |
|
|
* ({@code index < 0 || index > size()}) |
757 |
dl |
1.1 |
* @since 1.2 |
758 |
|
|
*/ |
759 |
|
|
public void add(int index, E element) { |
760 |
|
|
insertElementAt(element, index); |
761 |
|
|
} |
762 |
|
|
|
763 |
|
|
/** |
764 |
|
|
* Removes the element at the specified position in this Vector. |
765 |
|
|
* Shifts any subsequent elements to the left (subtracts one from their |
766 |
|
|
* indices). Returns the element that was removed from the Vector. |
767 |
|
|
* |
768 |
jsr166 |
1.18 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
769 |
|
|
* ({@code index < 0 || index >= size()}) |
770 |
dl |
1.1 |
* @param index the index of the element to be removed |
771 |
|
|
* @return element that was removed |
772 |
|
|
* @since 1.2 |
773 |
|
|
*/ |
774 |
|
|
public synchronized E remove(int index) { |
775 |
|
|
modCount++; |
776 |
|
|
if (index >= elementCount) |
777 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
778 |
|
|
Object oldValue = elementData[index]; |
779 |
|
|
|
780 |
|
|
int numMoved = elementCount - index - 1; |
781 |
|
|
if (numMoved > 0) |
782 |
|
|
System.arraycopy(elementData, index+1, elementData, index, |
783 |
|
|
numMoved); |
784 |
|
|
elementData[--elementCount] = null; // Let gc do its work |
785 |
|
|
|
786 |
|
|
return (E)oldValue; |
787 |
|
|
} |
788 |
|
|
|
789 |
|
|
/** |
790 |
|
|
* Removes all of the elements from this Vector. The Vector will |
791 |
|
|
* be empty after this call returns (unless it throws an exception). |
792 |
|
|
* |
793 |
|
|
* @since 1.2 |
794 |
|
|
*/ |
795 |
|
|
public void clear() { |
796 |
|
|
removeAllElements(); |
797 |
|
|
} |
798 |
|
|
|
799 |
|
|
// Bulk Operations |
800 |
|
|
|
801 |
|
|
/** |
802 |
|
|
* Returns true if this Vector contains all of the elements in the |
803 |
|
|
* specified Collection. |
804 |
|
|
* |
805 |
|
|
* @param c a collection whose elements will be tested for containment |
806 |
|
|
* in this Vector |
807 |
|
|
* @return true if this Vector contains all of the elements in the |
808 |
|
|
* specified collection |
809 |
|
|
* @throws NullPointerException if the specified collection is null |
810 |
|
|
*/ |
811 |
|
|
public synchronized boolean containsAll(Collection<?> c) { |
812 |
|
|
return super.containsAll(c); |
813 |
|
|
} |
814 |
|
|
|
815 |
|
|
/** |
816 |
|
|
* Appends all of the elements in the specified Collection to the end of |
817 |
|
|
* this Vector, in the order that they are returned by the specified |
818 |
|
|
* Collection's Iterator. The behavior of this operation is undefined if |
819 |
|
|
* the specified Collection is modified while the operation is in progress. |
820 |
|
|
* (This implies that the behavior of this call is undefined if the |
821 |
|
|
* specified Collection is this Vector, and this Vector is nonempty.) |
822 |
|
|
* |
823 |
|
|
* @param c elements to be inserted into this Vector |
824 |
jsr166 |
1.14 |
* @return {@code true} if this Vector changed as a result of the call |
825 |
dl |
1.1 |
* @throws NullPointerException if the specified collection is null |
826 |
|
|
* @since 1.2 |
827 |
|
|
*/ |
828 |
|
|
public synchronized boolean addAll(Collection<? extends E> c) { |
829 |
|
|
modCount++; |
830 |
|
|
Object[] a = c.toArray(); |
831 |
|
|
int numNew = a.length; |
832 |
|
|
ensureCapacityHelper(elementCount + numNew); |
833 |
|
|
System.arraycopy(a, 0, elementData, elementCount, numNew); |
834 |
|
|
elementCount += numNew; |
835 |
|
|
return numNew != 0; |
836 |
|
|
} |
837 |
|
|
|
838 |
|
|
/** |
839 |
|
|
* Removes from this Vector all of its elements that are contained in the |
840 |
|
|
* specified Collection. |
841 |
|
|
* |
842 |
|
|
* @param c a collection of elements to be removed from the Vector |
843 |
|
|
* @return true if this Vector changed as a result of the call |
844 |
|
|
* @throws ClassCastException if the types of one or more elements |
845 |
|
|
* in this vector are incompatible with the specified |
846 |
|
|
* collection (optional) |
847 |
|
|
* @throws NullPointerException if this vector contains one or more null |
848 |
|
|
* elements and the specified collection does not support null |
849 |
|
|
* elements (optional), or if the specified collection is null |
850 |
|
|
* @since 1.2 |
851 |
|
|
*/ |
852 |
|
|
public synchronized boolean removeAll(Collection<?> c) { |
853 |
|
|
return super.removeAll(c); |
854 |
|
|
} |
855 |
|
|
|
856 |
|
|
/** |
857 |
|
|
* Retains only the elements in this Vector that are contained in the |
858 |
|
|
* specified Collection. In other words, removes from this Vector all |
859 |
|
|
* of its elements that are not contained in the specified Collection. |
860 |
|
|
* |
861 |
|
|
* @param c a collection of elements to be retained in this Vector |
862 |
|
|
* (all other elements are removed) |
863 |
|
|
* @return true if this Vector changed as a result of the call |
864 |
|
|
* @throws ClassCastException if the types of one or more elements |
865 |
|
|
* in this vector are incompatible with the specified |
866 |
|
|
* collection (optional) |
867 |
|
|
* @throws NullPointerException if this vector contains one or more null |
868 |
|
|
* elements and the specified collection does not support null |
869 |
|
|
* elements (optional), or if the specified collection is null |
870 |
|
|
* @since 1.2 |
871 |
|
|
*/ |
872 |
|
|
public synchronized boolean retainAll(Collection<?> c) { |
873 |
|
|
return super.retainAll(c); |
874 |
|
|
} |
875 |
|
|
|
876 |
|
|
/** |
877 |
|
|
* Inserts all of the elements in the specified Collection into this |
878 |
|
|
* Vector at the specified position. Shifts the element currently at |
879 |
|
|
* that position (if any) and any subsequent elements to the right |
880 |
|
|
* (increases their indices). The new elements will appear in the Vector |
881 |
|
|
* in the order that they are returned by the specified Collection's |
882 |
|
|
* iterator. |
883 |
|
|
* |
884 |
|
|
* @param index index at which to insert the first element from the |
885 |
|
|
* specified collection |
886 |
|
|
* @param c elements to be inserted into this Vector |
887 |
jsr166 |
1.14 |
* @return {@code true} if this Vector changed as a result of the call |
888 |
jsr166 |
1.18 |
* @throws ArrayIndexOutOfBoundsException if the index is out of range |
889 |
|
|
* ({@code index < 0 || index > size()}) |
890 |
dl |
1.1 |
* @throws NullPointerException if the specified collection is null |
891 |
|
|
* @since 1.2 |
892 |
|
|
*/ |
893 |
|
|
public synchronized boolean addAll(int index, Collection<? extends E> c) { |
894 |
|
|
modCount++; |
895 |
|
|
if (index < 0 || index > elementCount) |
896 |
|
|
throw new ArrayIndexOutOfBoundsException(index); |
897 |
|
|
|
898 |
|
|
Object[] a = c.toArray(); |
899 |
|
|
int numNew = a.length; |
900 |
|
|
ensureCapacityHelper(elementCount + numNew); |
901 |
|
|
|
902 |
|
|
int numMoved = elementCount - index; |
903 |
|
|
if (numMoved > 0) |
904 |
|
|
System.arraycopy(elementData, index, elementData, index + numNew, |
905 |
|
|
numMoved); |
906 |
|
|
|
907 |
|
|
System.arraycopy(a, 0, elementData, index, numNew); |
908 |
|
|
elementCount += numNew; |
909 |
|
|
return numNew != 0; |
910 |
|
|
} |
911 |
|
|
|
912 |
|
|
/** |
913 |
|
|
* Compares the specified Object with this Vector for equality. Returns |
914 |
|
|
* true if and only if the specified Object is also a List, both Lists |
915 |
|
|
* have the same size, and all corresponding pairs of elements in the two |
916 |
jsr166 |
1.14 |
* Lists are <em>equal</em>. (Two elements {@code e1} and |
917 |
|
|
* {@code e2} are <em>equal</em> if {@code (e1==null ? e2==null : |
918 |
|
|
* e1.equals(e2))}.) In other words, two Lists are defined to be |
919 |
dl |
1.1 |
* equal if they contain the same elements in the same order. |
920 |
|
|
* |
921 |
|
|
* @param o the Object to be compared for equality with this Vector |
922 |
|
|
* @return true if the specified Object is equal to this Vector |
923 |
|
|
*/ |
924 |
|
|
public synchronized boolean equals(Object o) { |
925 |
|
|
return super.equals(o); |
926 |
|
|
} |
927 |
|
|
|
928 |
|
|
/** |
929 |
|
|
* Returns the hash code value for this Vector. |
930 |
|
|
*/ |
931 |
|
|
public synchronized int hashCode() { |
932 |
|
|
return super.hashCode(); |
933 |
|
|
} |
934 |
|
|
|
935 |
|
|
/** |
936 |
|
|
* Returns a string representation of this Vector, containing |
937 |
|
|
* the String representation of each element. |
938 |
|
|
*/ |
939 |
|
|
public synchronized String toString() { |
940 |
|
|
return super.toString(); |
941 |
|
|
} |
942 |
|
|
|
943 |
|
|
/** |
944 |
|
|
* Removes from this List all of the elements whose index is between |
945 |
|
|
* fromIndex, inclusive and toIndex, exclusive. Shifts any succeeding |
946 |
|
|
* elements to the left (reduces their index). |
947 |
dl |
1.10 |
* This call shortens the Vector by (toIndex - fromIndex) elements. (If |
948 |
dl |
1.1 |
* toIndex==fromIndex, this operation has no effect.) |
949 |
|
|
* |
950 |
|
|
* @param fromIndex index of first element to be removed |
951 |
|
|
* @param toIndex index after last element to be removed |
952 |
|
|
*/ |
953 |
|
|
protected synchronized void removeRange(int fromIndex, int toIndex) { |
954 |
|
|
modCount++; |
955 |
|
|
int numMoved = elementCount - toIndex; |
956 |
|
|
System.arraycopy(elementData, toIndex, elementData, fromIndex, |
957 |
|
|
numMoved); |
958 |
|
|
|
959 |
|
|
// Let gc do its work |
960 |
|
|
int newElementCount = elementCount - (toIndex-fromIndex); |
961 |
|
|
while (elementCount != newElementCount) |
962 |
|
|
elementData[--elementCount] = null; |
963 |
|
|
} |
964 |
|
|
|
965 |
|
|
/** |
966 |
jsr166 |
1.14 |
* Save the state of the {@code Vector} instance to a stream (that |
967 |
dl |
1.1 |
* is, serialize it). This method is present merely for synchronization. |
968 |
|
|
* It just calls the default writeObject method. |
969 |
|
|
*/ |
970 |
|
|
private synchronized void writeObject(java.io.ObjectOutputStream s) |
971 |
|
|
throws java.io.IOException |
972 |
|
|
{ |
973 |
|
|
s.defaultWriteObject(); |
974 |
|
|
} |
975 |
|
|
|
976 |
|
|
/** |
977 |
|
|
* Returns a list-iterator of the elements in this list (in proper |
978 |
|
|
* sequence), starting at the specified position in the list. |
979 |
dl |
1.10 |
* Obeys the general contract of {@link List#listIterator(int)}. |
980 |
dl |
1.1 |
* |
981 |
dl |
1.10 |
* <p>The list-iterator is <i>fail-fast</i>: if the list is structurally |
982 |
dl |
1.1 |
* modified at any time after the Iterator is created, in any way except |
983 |
dl |
1.10 |
* through the list-iterator's own {@code remove} or {@code add} |
984 |
dl |
1.1 |
* methods, the list-iterator will throw a |
985 |
dl |
1.10 |
* {@code ConcurrentModificationException}. Thus, in the face of |
986 |
dl |
1.1 |
* concurrent modification, the iterator fails quickly and cleanly, rather |
987 |
|
|
* than risking arbitrary, non-deterministic behavior at an undetermined |
988 |
|
|
* time in the future. |
989 |
|
|
* |
990 |
|
|
* @param index index of the first element to be returned from the |
991 |
dl |
1.10 |
* list-iterator (by a call to {@link ListIterator#next}) |
992 |
|
|
* @return a list-iterator of the elements in this list (in proper |
993 |
dl |
1.1 |
* sequence), starting at the specified position in the list |
994 |
|
|
* @throws IndexOutOfBoundsException {@inheritDoc} |
995 |
|
|
*/ |
996 |
|
|
public synchronized ListIterator<E> listIterator(int index) { |
997 |
|
|
if (index < 0 || index > elementCount) |
998 |
|
|
throw new IndexOutOfBoundsException("Index: "+index); |
999 |
dl |
1.10 |
return new VectorIterator(index, elementCount); |
1000 |
dl |
1.1 |
} |
1001 |
jsr166 |
1.2 |
|
1002 |
dl |
1.1 |
/** |
1003 |
dl |
1.3 |
* {@inheritDoc} |
1004 |
|
|
*/ |
1005 |
|
|
public synchronized ListIterator<E> listIterator() { |
1006 |
dl |
1.10 |
return new VectorIterator(0, elementCount); |
1007 |
dl |
1.3 |
} |
1008 |
|
|
|
1009 |
|
|
/** |
1010 |
dl |
1.1 |
* Returns an iterator over the elements in this list in proper sequence. |
1011 |
|
|
* |
1012 |
|
|
* @return an iterator over the elements in this list in proper sequence |
1013 |
|
|
*/ |
1014 |
|
|
public synchronized Iterator<E> iterator() { |
1015 |
dl |
1.10 |
return new VectorIterator(0, elementCount); |
1016 |
dl |
1.1 |
} |
1017 |
|
|
|
1018 |
|
|
/** |
1019 |
dl |
1.10 |
* Helper method to access array elements under synchronization by |
1020 |
|
|
* iterators. The caller performs index check with respect to |
1021 |
|
|
* expected bounds, so errors accessing the element are reported |
1022 |
|
|
* as ConcurrentModificationExceptions. |
1023 |
|
|
*/ |
1024 |
|
|
final synchronized Object iteratorGet(int index, int expectedModCount) { |
1025 |
|
|
if (modCount == expectedModCount) { |
1026 |
|
|
try { |
1027 |
|
|
return elementData[index]; |
1028 |
|
|
} catch(IndexOutOfBoundsException fallThrough) { |
1029 |
|
|
} |
1030 |
|
|
} |
1031 |
|
|
throw new ConcurrentModificationException(); |
1032 |
|
|
} |
1033 |
|
|
|
1034 |
|
|
/** |
1035 |
|
|
* Streamlined specialization of AbstractList version of iterator. |
1036 |
jsr166 |
1.19 |
* Locally performs bounds checks, but relies on outer Vector |
1037 |
dl |
1.10 |
* to access elements under synchronization. |
1038 |
dl |
1.1 |
*/ |
1039 |
dl |
1.3 |
private final class VectorIterator implements ListIterator<E> { |
1040 |
dl |
1.10 |
int cursor; // Index of next element to return; |
1041 |
|
|
int fence; // Upper bound on cursor (cache of size()) |
1042 |
|
|
int lastRet; // Index of last element, or -1 if no such |
1043 |
|
|
int expectedModCount; // To check for CME |
1044 |
|
|
|
1045 |
|
|
VectorIterator(int index, int fence) { |
1046 |
|
|
this.cursor = index; |
1047 |
|
|
this.fence = fence; |
1048 |
|
|
this.lastRet = -1; |
1049 |
|
|
this.expectedModCount = Vector.this.modCount; |
1050 |
dl |
1.1 |
} |
1051 |
|
|
|
1052 |
|
|
public boolean hasNext() { |
1053 |
dl |
1.10 |
return cursor < fence; |
1054 |
dl |
1.1 |
} |
1055 |
|
|
|
1056 |
|
|
public boolean hasPrevious() { |
1057 |
dl |
1.10 |
return cursor > 0; |
1058 |
dl |
1.1 |
} |
1059 |
|
|
|
1060 |
|
|
public int nextIndex() { |
1061 |
|
|
return cursor; |
1062 |
|
|
} |
1063 |
|
|
|
1064 |
|
|
public int previousIndex() { |
1065 |
|
|
return cursor - 1; |
1066 |
|
|
} |
1067 |
|
|
|
1068 |
|
|
public E next() { |
1069 |
dl |
1.10 |
int i = cursor; |
1070 |
|
|
if (i >= fence) |
1071 |
dl |
1.3 |
throw new NoSuchElementException(); |
1072 |
dl |
1.10 |
Object next = Vector.this.iteratorGet(i, expectedModCount); |
1073 |
|
|
lastRet = i; |
1074 |
|
|
cursor = i + 1; |
1075 |
|
|
return (E)next; |
1076 |
dl |
1.1 |
} |
1077 |
jsr166 |
1.4 |
|
1078 |
dl |
1.10 |
public E previous() { |
1079 |
|
|
int i = cursor - 1; |
1080 |
|
|
if (i < 0) |
1081 |
dl |
1.3 |
throw new NoSuchElementException(); |
1082 |
dl |
1.10 |
Object prev = Vector.this.iteratorGet(i, expectedModCount); |
1083 |
|
|
lastRet = i; |
1084 |
|
|
cursor = i; |
1085 |
|
|
return (E)prev; |
1086 |
dl |
1.1 |
} |
1087 |
|
|
|
1088 |
dl |
1.10 |
public void set(E e) { |
1089 |
|
|
if (lastRet < 0) |
1090 |
dl |
1.1 |
throw new IllegalStateException(); |
1091 |
dl |
1.10 |
if (Vector.this.modCount != expectedModCount) |
1092 |
|
|
throw new ConcurrentModificationException(); |
1093 |
|
|
try { |
1094 |
|
|
Vector.this.set(lastRet, e); |
1095 |
|
|
expectedModCount = Vector.this.modCount; |
1096 |
jsr166 |
1.4 |
} catch (IndexOutOfBoundsException ex) { |
1097 |
dl |
1.3 |
throw new ConcurrentModificationException(); |
1098 |
|
|
} |
1099 |
dl |
1.1 |
} |
1100 |
|
|
|
1101 |
dl |
1.10 |
public void remove() { |
1102 |
|
|
int i = lastRet; |
1103 |
|
|
if (i < 0) |
1104 |
dl |
1.1 |
throw new IllegalStateException(); |
1105 |
dl |
1.10 |
if (Vector.this.modCount != expectedModCount) |
1106 |
dl |
1.3 |
throw new ConcurrentModificationException(); |
1107 |
dl |
1.10 |
try { |
1108 |
|
|
Vector.this.remove(i); |
1109 |
|
|
if (i < cursor) |
1110 |
|
|
cursor--; |
1111 |
|
|
lastRet = -1; |
1112 |
|
|
fence = Vector.this.size(); |
1113 |
|
|
expectedModCount = Vector.this.modCount; |
1114 |
dl |
1.3 |
} catch (IndexOutOfBoundsException ex) { |
1115 |
|
|
throw new ConcurrentModificationException(); |
1116 |
|
|
} |
1117 |
dl |
1.1 |
} |
1118 |
|
|
|
1119 |
|
|
public void add(E e) { |
1120 |
dl |
1.10 |
if (Vector.this.modCount != expectedModCount) |
1121 |
dl |
1.3 |
throw new ConcurrentModificationException(); |
1122 |
|
|
try { |
1123 |
|
|
int i = cursor; |
1124 |
dl |
1.10 |
Vector.this.add(i, e); |
1125 |
dl |
1.3 |
cursor = i + 1; |
1126 |
dl |
1.10 |
lastRet = -1; |
1127 |
|
|
fence = Vector.this.size(); |
1128 |
|
|
expectedModCount = Vector.this.modCount; |
1129 |
dl |
1.3 |
} catch (IndexOutOfBoundsException ex) { |
1130 |
|
|
throw new ConcurrentModificationException(); |
1131 |
|
|
} |
1132 |
dl |
1.1 |
} |
1133 |
|
|
} |
1134 |
dl |
1.10 |
|
1135 |
|
|
/** |
1136 |
|
|
* Returns a view of the portion of this List between fromIndex, |
1137 |
|
|
* inclusive, and toIndex, exclusive. (If fromIndex and toIndex are |
1138 |
|
|
* equal, the returned List is empty.) The returned List is backed by this |
1139 |
|
|
* List, so changes in the returned List are reflected in this List, and |
1140 |
|
|
* vice-versa. The returned List supports all of the optional List |
1141 |
jsr166 |
1.16 |
* operations supported by this List. |
1142 |
dl |
1.10 |
* |
1143 |
jsr166 |
1.16 |
* <p>This method eliminates the need for explicit range operations (of |
1144 |
dl |
1.10 |
* the sort that commonly exist for arrays). Any operation that expects |
1145 |
|
|
* a List can be used as a range operation by operating on a subList view |
1146 |
|
|
* instead of a whole List. For example, the following idiom |
1147 |
|
|
* removes a range of elements from a List: |
1148 |
|
|
* <pre> |
1149 |
|
|
* list.subList(from, to).clear(); |
1150 |
|
|
* </pre> |
1151 |
|
|
* Similar idioms may be constructed for indexOf and lastIndexOf, |
1152 |
|
|
* and all of the algorithms in the Collections class can be applied to |
1153 |
jsr166 |
1.16 |
* a subList. |
1154 |
dl |
1.10 |
* |
1155 |
jsr166 |
1.16 |
* <p>The semantics of the List returned by this method become undefined if |
1156 |
dl |
1.10 |
* the backing list (i.e., this List) is <i>structurally modified</i> in |
1157 |
|
|
* any way other than via the returned List. (Structural modifications are |
1158 |
|
|
* those that change the size of the List, or otherwise perturb it in such |
1159 |
|
|
* a fashion that iterations in progress may yield incorrect results.) |
1160 |
|
|
* |
1161 |
|
|
* @param fromIndex low endpoint (inclusive) of the subList |
1162 |
|
|
* @param toIndex high endpoint (exclusive) of the subList |
1163 |
|
|
* @return a view of the specified range within this List |
1164 |
jsr166 |
1.18 |
* @throws IndexOutOfBoundsException if an endpoint index value is out of range |
1165 |
|
|
* {@code (fromIndex < 0 || toIndex > size)} |
1166 |
|
|
* @throws IllegalArgumentException if the endpoint indices are out of order |
1167 |
|
|
* {@code (fromIndex > toIndex)} |
1168 |
dl |
1.10 |
*/ |
1169 |
|
|
public synchronized List<E> subList(int fromIndex, int toIndex) { |
1170 |
|
|
return new VectorSubList(this, this, fromIndex, fromIndex, toIndex); |
1171 |
|
|
} |
1172 |
|
|
|
1173 |
|
|
/** |
1174 |
|
|
* This class specializes the AbstractList version of SubList to |
1175 |
|
|
* avoid the double-indirection penalty that would arise using a |
1176 |
|
|
* synchronized wrapper, as well as to avoid some unnecessary |
1177 |
|
|
* checks in sublist iterators. |
1178 |
|
|
*/ |
1179 |
|
|
private static final class VectorSubList<E> extends AbstractList<E> implements RandomAccess { |
1180 |
|
|
final Vector<E> base; // base list |
1181 |
|
|
final AbstractList<E> parent; // Creating list |
1182 |
|
|
final int baseOffset; // index wrt Vector |
1183 |
|
|
final int parentOffset; // index wrt parent |
1184 |
|
|
int length; // length of sublist |
1185 |
|
|
|
1186 |
jsr166 |
1.11 |
VectorSubList(Vector<E> base, AbstractList<E> parent, int baseOffset, |
1187 |
dl |
1.10 |
int fromIndex, int toIndex) { |
1188 |
|
|
if (fromIndex < 0) |
1189 |
|
|
throw new IndexOutOfBoundsException("fromIndex = " + fromIndex); |
1190 |
|
|
if (toIndex > parent.size()) |
1191 |
|
|
throw new IndexOutOfBoundsException("toIndex = " + toIndex); |
1192 |
|
|
if (fromIndex > toIndex) |
1193 |
|
|
throw new IllegalArgumentException("fromIndex(" + fromIndex + |
1194 |
|
|
") > toIndex(" + toIndex + ")"); |
1195 |
|
|
|
1196 |
|
|
this.base = base; |
1197 |
|
|
this.parent = parent; |
1198 |
|
|
this.baseOffset = baseOffset; |
1199 |
|
|
this.parentOffset = fromIndex; |
1200 |
|
|
this.length = toIndex - fromIndex; |
1201 |
|
|
modCount = base.modCount; |
1202 |
|
|
} |
1203 |
|
|
|
1204 |
|
|
/** |
1205 |
|
|
* Returns an IndexOutOfBoundsException with nicer message |
1206 |
|
|
*/ |
1207 |
|
|
private IndexOutOfBoundsException indexError(int index) { |
1208 |
jsr166 |
1.11 |
return new IndexOutOfBoundsException("Index: " + index + |
1209 |
dl |
1.10 |
", Size: " + length); |
1210 |
|
|
} |
1211 |
|
|
|
1212 |
|
|
public E set(int index, E element) { |
1213 |
|
|
synchronized(base) { |
1214 |
|
|
if (index < 0 || index >= length) |
1215 |
|
|
throw indexError(index); |
1216 |
|
|
if (base.modCount != modCount) |
1217 |
|
|
throw new ConcurrentModificationException(); |
1218 |
|
|
return base.set(index + baseOffset, element); |
1219 |
|
|
} |
1220 |
|
|
} |
1221 |
|
|
|
1222 |
|
|
public E get(int index) { |
1223 |
|
|
synchronized(base) { |
1224 |
|
|
if (index < 0 || index >= length) |
1225 |
|
|
throw indexError(index); |
1226 |
|
|
if (base.modCount != modCount) |
1227 |
|
|
throw new ConcurrentModificationException(); |
1228 |
|
|
return base.get(index + baseOffset); |
1229 |
|
|
} |
1230 |
|
|
} |
1231 |
|
|
|
1232 |
|
|
public int size() { |
1233 |
|
|
synchronized(base) { |
1234 |
|
|
if (base.modCount != modCount) |
1235 |
|
|
throw new ConcurrentModificationException(); |
1236 |
|
|
return length; |
1237 |
|
|
} |
1238 |
|
|
} |
1239 |
|
|
|
1240 |
|
|
public void add(int index, E element) { |
1241 |
|
|
synchronized(base) { |
1242 |
|
|
if (index < 0 || index > length) |
1243 |
|
|
throw indexError(index); |
1244 |
|
|
if (base.modCount != modCount) |
1245 |
|
|
throw new ConcurrentModificationException(); |
1246 |
|
|
parent.add(index + parentOffset, element); |
1247 |
|
|
length++; |
1248 |
|
|
modCount = base.modCount; |
1249 |
|
|
} |
1250 |
|
|
} |
1251 |
|
|
|
1252 |
|
|
public E remove(int index) { |
1253 |
|
|
synchronized(base) { |
1254 |
|
|
if (index < 0 || index >= length) |
1255 |
|
|
throw indexError(index); |
1256 |
|
|
if (base.modCount != modCount) |
1257 |
|
|
throw new ConcurrentModificationException(); |
1258 |
|
|
E result = parent.remove(index + parentOffset); |
1259 |
|
|
length--; |
1260 |
|
|
modCount = base.modCount; |
1261 |
|
|
return result; |
1262 |
|
|
} |
1263 |
|
|
} |
1264 |
|
|
|
1265 |
|
|
protected void removeRange(int fromIndex, int toIndex) { |
1266 |
|
|
synchronized(base) { |
1267 |
|
|
if (base.modCount != modCount) |
1268 |
|
|
throw new ConcurrentModificationException(); |
1269 |
jsr166 |
1.11 |
parent.removeRange(fromIndex + parentOffset, |
1270 |
dl |
1.10 |
toIndex + parentOffset); |
1271 |
|
|
length -= (toIndex-fromIndex); |
1272 |
|
|
modCount = base.modCount; |
1273 |
|
|
} |
1274 |
|
|
} |
1275 |
|
|
|
1276 |
|
|
public boolean addAll(Collection<? extends E> c) { |
1277 |
|
|
return addAll(length, c); |
1278 |
|
|
} |
1279 |
|
|
|
1280 |
|
|
public boolean addAll(int index, Collection<? extends E> c) { |
1281 |
|
|
synchronized(base) { |
1282 |
|
|
if (index < 0 || index > length) |
1283 |
|
|
throw indexError(index); |
1284 |
|
|
int cSize = c.size(); |
1285 |
|
|
if (cSize==0) |
1286 |
|
|
return false; |
1287 |
jsr166 |
1.11 |
|
1288 |
dl |
1.10 |
if (base.modCount != modCount) |
1289 |
|
|
throw new ConcurrentModificationException(); |
1290 |
|
|
parent.addAll(parentOffset + index, c); |
1291 |
|
|
modCount = base.modCount; |
1292 |
|
|
length += cSize; |
1293 |
|
|
return true; |
1294 |
|
|
} |
1295 |
|
|
} |
1296 |
|
|
|
1297 |
|
|
public boolean equals(Object o) { |
1298 |
|
|
synchronized(base) {return super.equals(o);} |
1299 |
|
|
} |
1300 |
|
|
|
1301 |
|
|
public int hashCode() { |
1302 |
|
|
synchronized(base) {return super.hashCode();} |
1303 |
|
|
} |
1304 |
|
|
|
1305 |
|
|
public int indexOf(Object o) { |
1306 |
|
|
synchronized(base) {return super.indexOf(o);} |
1307 |
|
|
} |
1308 |
|
|
|
1309 |
|
|
public int lastIndexOf(Object o) { |
1310 |
|
|
synchronized(base) {return super.lastIndexOf(o);} |
1311 |
|
|
} |
1312 |
|
|
|
1313 |
|
|
public List<E> subList(int fromIndex, int toIndex) { |
1314 |
jsr166 |
1.11 |
return new VectorSubList(base, this, fromIndex + baseOffset, |
1315 |
dl |
1.10 |
fromIndex, toIndex); |
1316 |
|
|
} |
1317 |
|
|
|
1318 |
|
|
public Iterator<E> iterator() { |
1319 |
|
|
synchronized(base) { |
1320 |
|
|
return new VectorSubListIterator(this, 0); |
1321 |
|
|
} |
1322 |
|
|
} |
1323 |
jsr166 |
1.11 |
|
1324 |
dl |
1.10 |
public synchronized ListIterator<E> listIterator() { |
1325 |
|
|
synchronized(base) { |
1326 |
|
|
return new VectorSubListIterator(this, 0); |
1327 |
|
|
} |
1328 |
|
|
} |
1329 |
|
|
|
1330 |
|
|
public ListIterator<E> listIterator(int index) { |
1331 |
|
|
synchronized(base) { |
1332 |
|
|
if (index < 0 || index > length) |
1333 |
|
|
throw indexError(index); |
1334 |
|
|
return new VectorSubListIterator(this, index); |
1335 |
|
|
} |
1336 |
|
|
} |
1337 |
|
|
|
1338 |
|
|
/** |
1339 |
|
|
* Same idea as VectorIterator, except routing structural |
1340 |
|
|
* change operations through the sublist. |
1341 |
|
|
*/ |
1342 |
|
|
private static final class VectorSubListIterator<E> implements ListIterator<E> { |
1343 |
|
|
final Vector<E> base; // base list |
1344 |
|
|
final VectorSubList<E> outer; // Sublist creating this iteraor |
1345 |
|
|
final int offset; // cursor offset wrt base |
1346 |
|
|
int cursor; // Current index |
1347 |
|
|
int fence; // Upper bound on cursor |
1348 |
|
|
int lastRet; // Index of returned element, or -1 |
1349 |
|
|
int expectedModCount; // Expected modCount of base Vector |
1350 |
jsr166 |
1.11 |
|
1351 |
dl |
1.10 |
VectorSubListIterator(VectorSubList<E> list, int index) { |
1352 |
|
|
this.lastRet = -1; |
1353 |
|
|
this.cursor = index; |
1354 |
|
|
this.outer = list; |
1355 |
|
|
this.offset = list.baseOffset; |
1356 |
|
|
this.fence = list.length; |
1357 |
|
|
this.base = list.base; |
1358 |
|
|
this.expectedModCount = base.modCount; |
1359 |
|
|
} |
1360 |
jsr166 |
1.11 |
|
1361 |
dl |
1.10 |
public boolean hasNext() { |
1362 |
|
|
return cursor < fence; |
1363 |
|
|
} |
1364 |
jsr166 |
1.11 |
|
1365 |
dl |
1.10 |
public boolean hasPrevious() { |
1366 |
|
|
return cursor > 0; |
1367 |
|
|
} |
1368 |
jsr166 |
1.11 |
|
1369 |
dl |
1.10 |
public int nextIndex() { |
1370 |
|
|
return cursor; |
1371 |
|
|
} |
1372 |
jsr166 |
1.11 |
|
1373 |
dl |
1.10 |
public int previousIndex() { |
1374 |
|
|
return cursor - 1; |
1375 |
|
|
} |
1376 |
jsr166 |
1.11 |
|
1377 |
dl |
1.10 |
public E next() { |
1378 |
|
|
int i = cursor; |
1379 |
|
|
if (cursor >= fence) |
1380 |
|
|
throw new NoSuchElementException(); |
1381 |
|
|
Object next = base.iteratorGet(i + offset, expectedModCount); |
1382 |
|
|
lastRet = i; |
1383 |
|
|
cursor = i + 1; |
1384 |
|
|
return (E)next; |
1385 |
|
|
} |
1386 |
jsr166 |
1.11 |
|
1387 |
dl |
1.10 |
public E previous() { |
1388 |
|
|
int i = cursor - 1; |
1389 |
|
|
if (i < 0) |
1390 |
|
|
throw new NoSuchElementException(); |
1391 |
|
|
Object prev = base.iteratorGet(i + offset, expectedModCount); |
1392 |
|
|
lastRet = i; |
1393 |
|
|
cursor = i; |
1394 |
|
|
return (E)prev; |
1395 |
|
|
} |
1396 |
jsr166 |
1.11 |
|
1397 |
dl |
1.10 |
public void set(E e) { |
1398 |
|
|
if (lastRet < 0) |
1399 |
|
|
throw new IllegalStateException(); |
1400 |
|
|
if (base.modCount != expectedModCount) |
1401 |
|
|
throw new ConcurrentModificationException(); |
1402 |
|
|
try { |
1403 |
|
|
outer.set(lastRet, e); |
1404 |
|
|
expectedModCount = base.modCount; |
1405 |
|
|
} catch (IndexOutOfBoundsException ex) { |
1406 |
|
|
throw new ConcurrentModificationException(); |
1407 |
|
|
} |
1408 |
|
|
} |
1409 |
jsr166 |
1.11 |
|
1410 |
dl |
1.10 |
public void remove() { |
1411 |
|
|
int i = lastRet; |
1412 |
|
|
if (i < 0) |
1413 |
|
|
throw new IllegalStateException(); |
1414 |
|
|
if (base.modCount != expectedModCount) |
1415 |
|
|
throw new ConcurrentModificationException(); |
1416 |
|
|
try { |
1417 |
|
|
outer.remove(i); |
1418 |
|
|
if (i < cursor) |
1419 |
|
|
cursor--; |
1420 |
|
|
lastRet = -1; |
1421 |
|
|
fence = outer.length; |
1422 |
|
|
expectedModCount = base.modCount; |
1423 |
|
|
} catch (IndexOutOfBoundsException ex) { |
1424 |
|
|
throw new ConcurrentModificationException(); |
1425 |
|
|
} |
1426 |
|
|
} |
1427 |
jsr166 |
1.11 |
|
1428 |
dl |
1.10 |
public void add(E e) { |
1429 |
|
|
if (base.modCount != expectedModCount) |
1430 |
|
|
throw new ConcurrentModificationException(); |
1431 |
|
|
try { |
1432 |
|
|
int i = cursor; |
1433 |
|
|
outer.add(i, e); |
1434 |
|
|
cursor = i + 1; |
1435 |
|
|
lastRet = -1; |
1436 |
|
|
fence = outer.length; |
1437 |
|
|
expectedModCount = base.modCount; |
1438 |
|
|
} catch (IndexOutOfBoundsException ex) { |
1439 |
|
|
throw new ConcurrentModificationException(); |
1440 |
|
|
} |
1441 |
|
|
} |
1442 |
|
|
} |
1443 |
|
|
} |
1444 |
dl |
1.1 |
} |
1445 |
dl |
1.10 |
|
1446 |
|
|
|
1447 |
jsr166 |
1.11 |
|