jef.common.Entry.java Source code

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Here is the source code for jef.common.Entry.java

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/*
 * JEF - Copyright 2009-2010 Jiyi (mr.jiyi@gmail.com)
 *
 * 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 jef.common;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.ObjectUtils;

/**
 * ???
 * @author Administrator
 *
 * @param <K>
 * @param <V>
 */
public class Entry<K, V> implements Serializable, java.util.Map.Entry<K, V> {
    private static final long serialVersionUID = 2805658306682403737L;
    private K key;
    private V value;

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

    public K getKey() {
        return key;
    }

    public V getValue() {
        return value;
    }

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

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

    public Entry() {
    };

    public Entry(K k, V v) {
        this.key = k;
        this.value = v;
    }

    public static <K, V> List<Entry<K, V>> fromMap(Map<K, V> map) {
        List<Entry<K, V>> list = new ArrayList<Entry<K, V>>();
        for (K k : map.keySet()) {
            list.add(new Entry<K, V>(k, map.get(k)));
        }
        return list;
    }

    @Override
    public int hashCode() {
        int i = 0;
        if (key != null)
            i += key.hashCode();
        if (value != null)
            i += value.hashCode();
        return i;
    }

    @SuppressWarnings("rawtypes")
    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Entry) {
            if (!ObjectUtils.equals(((Entry) obj).getKey(), key))
                return false;
            if (!ObjectUtils.equals(((Entry) obj).getValue(), value))
                return false;
            return true;
        } else {
            return false;
        }
    }
}