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dl |
1.1 |
/* |
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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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jsr166 |
1.3 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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dl |
1.1 |
*/ |
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// A set wrapper over CHM for testing |
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jsr166 |
1.4 |
import java.io.*; |
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dl |
1.1 |
import java.util.*; |
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import java.util.concurrent.*; |
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public class ConcurrentHashSet<E> extends AbstractSet<E> |
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implements Set<E>, Serializable { |
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private final ConcurrentHashMap<E, Boolean> m; // The backing map |
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private transient Set<E> keySet; // Its keySet |
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jsr166 |
1.2 |
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public ConcurrentHashSet() { |
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dl |
1.1 |
m = new ConcurrentHashMap<E, Boolean>(); |
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keySet = m.keySet(); |
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} |
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public ConcurrentHashSet(int initialCapacity) { |
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m = new ConcurrentHashMap<E, Boolean>(initialCapacity); |
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keySet = m.keySet(); |
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} |
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jsr166 |
1.2 |
public ConcurrentHashSet(int initialCapacity, float loadFactor, |
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dl |
1.1 |
int concurrencyLevel) { |
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jsr166 |
1.2 |
m = new ConcurrentHashMap<E, Boolean>(initialCapacity, loadFactor, |
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dl |
1.1 |
concurrencyLevel); |
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keySet = m.keySet(); |
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} |
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public int size() { return m.size(); } |
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public boolean isEmpty() { return m.isEmpty(); } |
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public boolean contains(Object o) { return m.containsKey(o); } |
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public Iterator<E> iterator() { return keySet.iterator(); } |
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public Object[] toArray() { return keySet.toArray(); } |
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public <T> T[] toArray(T[] a) { return keySet.toArray(a); } |
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public boolean add(E e) { |
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return m.put(e, Boolean.TRUE) == null; |
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} |
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public boolean remove(Object o) { return m.remove(o) != null; } |
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public boolean removeAll(Collection<?> c) { |
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return keySet.removeAll(c); |
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} |
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public boolean retainAll(Collection<?> c) { |
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return keySet.retainAll(c); |
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} |
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public void clear() { m.clear(); } |
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public boolean equals(Object o) { return keySet.equals(o); } |
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public int hashCode() { return keySet.hashCode(); } |
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private static final long serialVersionUID = 2454657854757543876L; |
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private void readObject(java.io.ObjectInputStream s) |
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throws IOException, ClassNotFoundException |
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{ |
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s.defaultReadObject(); |
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keySet = m.keySet(); |
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} |
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} |
