package com.planet_ink.coffee_mud.core.collections; import java.util.*; /* Copyright 2010-2019 Bo Zimmerman 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. */ public class Pair<T, K> implements Map.Entry<T, K> { public T first; public K second; public Pair() { first = null; second = null; } public Pair(final T frst, final K scnd) { first = frst; second = scnd; } public static final class FirstConverter<T, K> implements Converter<Pair<T, K>, T> { @Override public T convert(final Pair<T, K> obj) { return obj.first; } } public static final class SecondConverter<T, K> implements Converter<Pair<T, K>, K> { @Override public K convert(final Pair<T, K> obj) { return obj.second; } } @Override public T getKey() { return first; } @Override public K getValue() { return second; } @Override public K setValue(final K value) { second = value; return value; } @Override public boolean equals(final Object o) { if (o == this) return true; if (o instanceof Pair) { final Pair<?,?> p = (Pair<?,?>) o; return ((p.first == first) || ((p.first != null) && (p.first.equals(first)))) && ((p.second == second) || ((p.second != null) && (p.second.equals(second)))); } return super.equals(o); } @Override public int hashCode() { return ((first == null) ? 0 : first.hashCode()) ^ ((second == null) ? 0 : second.hashCode()); } }