Pair.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.zookeeper.inspector.manager;

/**
 * A utility class for storing a pair of objects
 * 
 * @param <K>
 * @param <V>
 */
public class Pair<K, V> {
    private K key;
    private V value;

    /**
     * @param key
     * @param value
     */
    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }

    /**
	 * 
	 */
    public Pair() {
        // Do Nothing
    }

    /**
     * @return key
     */
    public K getKey() {
        return key;
    }

    /**
     * @param key
     */
    public void setKey(K key) {
        this.key = key;
    }

    /**
     * @return value
     */
    public V getValue() {
        return value;
    }

    /**
     * @param value
     */
    public void setValue(V value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "Pair [" + key + ", " + value + "]";
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((key == null) ? 0 : key.hashCode());
        result = prime * result + ((value == null) ? 0 : value.hashCode());
        return result;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Pair<?, ?> other = (Pair<?, ?>) obj;
        if (key == null) {
            if (other.key != null)
                return false;
        } else if (!key.equals(other.key))
            return false;
        if (value == null) {
            if (other.value != null)
                return false;
        } else if (!value.equals(other.value))
            return false;
        return true;
    }

}