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Groovy: A powerful, dynamic language for the JVM

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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.util;

import java.util.Map;

import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

/**
 * A Map.Entry implementation.
 * 
 * @author James Strachan
 * @version $Revision$
 */
public class MapEntry implements Map.Entry {

    private Object key;
    private Object value;

    public MapEntry(Object key, Object value) {
        this.key = key;
        this.value = value;
    }

    public boolean equals(Object that) {
        if (that instanceof MapEntry) {
            return equals((MapEntry) that);
        }
        return false;
    }

    public boolean equals(MapEntry that) {
        return DefaultTypeTransformation.compareEqual(this.key, that.key) && DefaultTypeTransformation.compareEqual(this.value, that.value);
    }

    public int hashCode() {
        return hash(key) ^ hash(value);
    }

    public String toString() {
        return "" + key + ":" + value;
    }

    public Object getKey() {
        return key;
    }

    public void setKey(Object key) {
        this.key = key;
    }

    public Object getValue() {
        return value;
    }

    public Object setValue(Object value) {
        this.value = value;
        return value;
    }

    /**
     * Helper method to handle object hashes for possibly null values
     */
    protected int hash(Object object) {
        return (object == null) ? 0xbabe : object.hashCode();
    }

}