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dl |
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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
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/** |
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* This is an incomplete implementation of a wrapper class |
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* that places read-write locks around unsynchronized Collections. |
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* Exists as a sample input for CollectionLoops test. |
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*/ |
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public final class RWCollection<E> implements Collection<E> { |
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private final Collection c; |
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private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
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public RWCollection(Collection<E> c) { |
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if (c == null) |
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throw new NullPointerException(); |
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this.c = c; |
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} |
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public RWCollection() { |
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this(new ArrayList<E>()); |
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} |
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public final int size() { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.size();} finally { l.unlock(); } |
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} |
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public final boolean isEmpty(){ |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.isEmpty();} finally { l.unlock(); } |
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} |
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public final boolean contains(Object o) { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.contains(o);} finally { l.unlock(); } |
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} |
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public final boolean equals(Object o) { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.equals(o);} finally { l.unlock(); } |
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} |
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public final int hashCode() { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.hashCode();} finally { l.unlock(); } |
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} |
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public final String toString() { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.toString();} finally { l.unlock(); } |
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} |
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public final Iterator<E> iterator() { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.iterator();} finally { l.unlock(); } |
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} |
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public final Object[] toArray() { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return c.toArray();} finally { l.unlock(); } |
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} |
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public final <T> T[] toArray(T[] a) { |
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final ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
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l.lock(); try {return (T[])c.toArray(a);} finally { l.unlock(); } |
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} |
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public final boolean add(E e) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.add(e);} finally { l.unlock(); } |
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} |
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public final boolean remove(Object o) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.remove(o);} finally { l.unlock(); } |
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} |
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public final boolean containsAll(Collection<?> coll) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.containsAll(coll);} finally { l.unlock(); } |
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} |
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public final boolean addAll(Collection<? extends E> coll) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.addAll(coll);} finally { l.unlock(); } |
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} |
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public final boolean removeAll(Collection<?> coll) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.removeAll(coll);} finally { l.unlock(); } |
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} |
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public final boolean retainAll(Collection<?> coll) { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {return c.retainAll(coll);} finally { l.unlock(); } |
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} |
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public final void clear() { |
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final ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
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l.lock(); try {c.clear();} finally { l.unlock(); } |
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} |
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} |
