SimpleMapEntry.java

/*
 * The JabaJaba class library
 *  Copyright (C) 1997-1998  ASAMI, Tomoharu (tasami@ibm.net)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package com.AsamiOffice.util;

import java.util.*;

/**
 * SimpleArrayEntry
 *
 * @since   Dec. 28, 1998
 * @version Dec. 28, 1998
 * @author  ASAMI, Tomoharu (tasami@ibm.net)
 */
public class SimpleMapEntry implements Map.Entry {
    protected int hash_;
    protected Object key_;
    protected Object value_;

    public SimpleMapEntry(Object key) {
	key_ = key;
    }

    public SimpleMapEntry(Object key, Object value) {
	key_ = key;
	value_ = value;
    }

    public Object getKey() {
	return (key_);
    }

    public Object getValue() {
	return (value_);
    }

    public Object setValue(Object value) {
	Object oldValue = value_;
	value_ = value;
	return (oldValue);
    }

    public boolean equals(Object o) {
	if (!(o instanceof Map.Entry)) {
	    return (false);
	}
	Map.Entry entry = (Map.Entry)o;
	Object key = entry.getKey();
	if (key_ == null) {
	    if (key != null) {
		return (false);
	    }
	} else {
	    if (!key_.equals(key)) {
		return (false);
	    }
	}
	Object value = entry.getValue();
	if (value_ == null) {
	    if (value != null) {
		return (false);
	    }
	} else {
	    if (!value_.equals(value)) {
		return (false);
	    }
	}
	return (true);
    }

    public int hashCode() {
	if (value_ == null) {
	    return (0);
	}
	return (value_.hashCode());
    }

    public String toString() {
	return (key_.toString() + "=" + value_.toString());
    }
}