SimpleEntry.java

package com.openedit.util;

import java.util.Map;

/**
 * Copied from AbstractMap
 * @author cburkey
 * @date Feb 6, 2003
 */
public class SimpleEntry implements Map.Entry
{
	Object key;
	Object value;
	
	public SimpleEntry(Object key, Object value) {
		this.key   = key;
		this.value = value;
	}
	
	public SimpleEntry(Map.Entry e) {
		this.key   = e.getKey();
		this.value = e.getValue();
	}
	
	public Object getKey() {
		return key;
	}
	
	public Object getValue() {
		return value;
	}
	
	public Object setValue(Object value) {
		Object oldValue = this.value;
		this.value = value;
		return oldValue;
	}
	
	public boolean equals(Object o) {
		if (!(o instanceof Map.Entry))
		return false;
		Map.Entry e = (Map.Entry)o;
		return eq(key, e.getKey()) &&  eq(value, e.getValue());
	}
	
	public int hashCode() {
		Object v;
		return ((key   == null)   ? 0 :   key.hashCode()) ^
			((value == null)   ? 0 : value.hashCode());
	}
	
	public String toString() {
		return key + "=" + value;
	}
	
	private static boolean eq(Object o1, Object o2) {
		return (o1 == null ? o2 == null : o1.equals(o2));
	}
}