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CHashMap.java
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CHashMap.java
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package nallar.collections;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* Concurrent HashMap, which extends HashMap.
* Necessary as ConcurrentHashMap does not, so it's
* much harder to replace usages of HashMap with it
*/
public class CHashMap<K, V> extends HashMap<K, V> {
private static final long serialVersionUID = 7249069246763182397L;
protected ConcurrentHashMap<K, V> hashMap;
public CHashMap(int initialCapacity, float loadFactor) {
hashMap = new ConcurrentHashMap<K, V>(initialCapacity);
}
public CHashMap(int initialCapacity) {
hashMap = new ConcurrentHashMap<K, V>(initialCapacity);
}
public CHashMap() {
hashMap = new ConcurrentHashMap<K, V>();
}
public CHashMap(Map<? extends K, ? extends V> m) {
hashMap = new ConcurrentHashMap<K, V>(m.size());
hashMap.putAll(m);
}
@Override
public int size() {
return hashMap.size();
}
@Override
public boolean isEmpty() {
return hashMap.isEmpty();
}
@Override
public V get(Object key) {
return key == null ? null : hashMap.get(key);
}
@Override
public boolean containsKey(Object key) {
return key != null && hashMap.containsKey(key);
}
@Override
public V put(K key, V value) {
return (key == null || value == null) ? null : hashMap.put(key, value);
}
@Override
public void putAll(Map<? extends K, ? extends V> m) {
hashMap.putAll(m);
}
@Override
public V remove(Object key) {
return key == null ? null : hashMap.remove(key);
}
@Override
public void clear() {
hashMap.clear();
}
@Override
public boolean containsValue(Object value) {
return value != null && hashMap.containsValue(value);
}
@Override
public Set<K> keySet() {
return hashMap.keySet();
}
@Override
public Collection<V> values() {
return hashMap.values();
}
@Override
public Set<Map.Entry<K, V>> entrySet() {
return hashMap.entrySet();
}
@SuppressWarnings ("EqualsWhichDoesntCheckParameterClass")
@Override
public boolean equals(Object o) {
return hashMap.equals(o);
}
@Override
public int hashCode() {
return hashMap.hashCode();
}
@Override
public String toString() {
return hashMap.toString();
}
}