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package edu.uci.ics.jung.algorithms.util;
import java.util.HashMap;
import java.util.Map;
/**
* An simple minimal implementation of <code>Map.Entry</code>.
*
* @param <K> the key type
* @param <V> the value type
*/
public class BasicMapEntry<K,V> implements Map.Entry<K,V> {
final K key;
V value;
/**
* Create new entry.
*/
public BasicMapEntry(K k, V v) {
value = v;
key = k;
}
public K getKey() {
return key;
}
public V getValue() {
return value;
}
public V setValue(V newValue) {
V oldValue = value;
value = newValue;
return oldValue;
}
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object o) {
if (!(o instanceof Map.Entry))
return false;
Map.Entry e = (Map.Entry)o;
Object k1 = getKey();
Object k2 = e.getKey();
if (k1 == k2 || (k1 != null && k1.equals(k2))) {
Object v1 = getValue();
Object v2 = e.getValue();
if (v1 == v2 || (v1 != null && v1.equals(v2)))
return true;
}
return false;
}
@Override
public int hashCode() {
return (key==null ? 0 : key.hashCode()) ^
(value==null ? 0 : value.hashCode());
}
@Override
public String toString() {
return getKey() + "=" + getValue();
}
/**
* This method is invoked whenever the value in an entry is
* overwritten by an invocation of put(k,v) for a key k that's already
* in the HashMap.
*/
void recordAccess(HashMap<K,V> m) {
}
/**
* This method is invoked whenever the entry is
* removed from the table.
*/
void recordRemoval(HashMap<K,V> m) {
}
}
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