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Groovy example source code file (MapEntry.java)

This example Groovy source code file (MapEntry.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

mapentry, mapentry, object, object, string, string, util

The Groovy MapEntry.java source code

/*
 * 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 <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 16850 $
 */
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();
    }

}

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