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PartiallySynchronizedMap.java
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PartiallySynchronizedMap.java
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package me.nallar.collections;
import java.util.AbstractSet;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class PartiallySynchronizedMap<K, V> extends HashMap<K, V> {
private KeySet ks;
public PartiallySynchronizedMap(final int initialCapacity, final float loadFactor) {
super(initialCapacity, loadFactor);
}
public PartiallySynchronizedMap(final int initialCapacity) {
super(initialCapacity);
}
public PartiallySynchronizedMap() {
super();
}
public PartiallySynchronizedMap(final Map<? extends K, ? extends V> m) {
super(m);
}
@Override
public synchronized V put(final K key, final V value) {
return super.put(key, value);
}
@Override
public synchronized void putAll(final Map<? extends K, ? extends V> m) {
super.putAll(m);
}
@Override
public synchronized V remove(final Object key) {
return super.remove(key);
}
@Override
public synchronized void clear() {
super.clear();
}
@Override
public Set<K> keySet() {
return ks == null ? (ks = new KeySet(super.keySet())) : ks;
}
private final class KeySet extends AbstractSet<K> {
private final Set<K> realSet;
KeySet(final Set<K> realSet) {
this.realSet = realSet;
}
@Override
public Iterator<K> iterator() {
return realSet.iterator();
}
@Override
public int size() {
return PartiallySynchronizedMap.this.size();
}
@Override
public boolean contains(Object o) {
return containsKey(o);
}
@Override
public boolean remove(Object o) {
return PartiallySynchronizedMap.this.remove(o) != null;
}
@Override
public void clear() {
PartiallySynchronizedMap.this.clear();
}
}
}