/*
* Copyright 2000-2012 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.util.containers;
import gnu.trove.TObjectHashingStrategy;
import org.jetbrains.annotations.NotNull;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
public class ConcurrentHashSet<K> implements Set<K> {
private final ConcurrentMap<K, Boolean> map;
public ConcurrentHashSet(int initialCapacity) {
map = new ConcurrentHashMap<K, Boolean>(initialCapacity);
}
public ConcurrentHashSet() {
map = new ConcurrentHashMap<K, Boolean>();
}
public ConcurrentHashSet(TObjectHashingStrategy<K> hashingStrategy) {
map = new ConcurrentHashMap<K, Boolean>(hashingStrategy);
}
@Override
public int size() {
return map.size();
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
@Override
public boolean contains(Object o) {
return map.containsKey(o);
}
@NotNull
@Override
public Iterator<K> iterator() {
return map.keySet().iterator();
}
@NotNull
@Override
public Object[] toArray() {
return map.keySet().toArray();
}
@NotNull
@Override
public <T> T[] toArray(T[] a) {
return map.keySet().toArray(a);
}
@Override
public boolean add(K o) {
return map.putIfAbsent(o, Boolean.TRUE) == null;
}
@Override
public boolean remove(Object o) {
return map.keySet().remove(o);
}
@Override
public boolean containsAll(Collection<?> c) {
return map.keySet().containsAll(c);
}
@Override
public boolean addAll(Collection<? extends K> c) {
boolean ret = false;
for (K o : c) {
ret |= add(o);
}
return ret;
}
@Override
public boolean retainAll(Collection<?> c) {
return map.keySet().retainAll(c);
}
@Override
public boolean removeAll(Collection<?> c) {
return map.keySet().removeAll(c);
}
@Override
public void clear() {
map.clear();
}
@Override
public String toString() {
return map.keySet().toString();
}
}