/*
* Copyright 2012-2015 org.opencloudb.
*
* 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 org.opencloudb.parser.util;
/**
* (created at 2010-7-21)
*
* @author mycat
*/
public final class Pair<K, V> {
private final K key;
private final V value;
public Pair(K key, V value) {
this.key = key;
this.value = value;
}
public K getKey() {
return key;
}
public V getValue() {
return value;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("(").append(key).append(", ").append(value).append(")");
return sb.toString();
}
private static final int HASH_CONST = 37;
@Override
public int hashCode() {
int hash = 17;
if (key == null) {
hash += HASH_CONST;
} else {
hash = hash << 5 + hash << 1 + hash + key.hashCode();
}
if (value == null) {
hash += HASH_CONST;
} else {
hash = hash << 5 + hash << 1 + hash + value.hashCode();
}
return hash;
}
@SuppressWarnings("rawtypes")
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof Pair)) return false;
Pair that = (Pair) obj;
return isEquals(this.key, that.key) && isEquals(this.value, that.value);
}
private boolean isEquals(Object o1, Object o2) {
if (o1 == o2) return true;
if (o1 == null) return o2 == null;
return o1.equals(o2);
}
}