001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.core.impl;
020
021/**
022 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
023 */
024public final class TypeAdapterKey {
025
026    public final Class<?> input;
027
028    public final Class<?> output;
029
030    private int hashCode;
031
032    public TypeAdapterKey(Class<?> input, Class<?> output) {
033        this.input = input;
034        this.output = output;
035    }
036
037    @Override
038    public boolean equals(Object obj) {
039        if (this == obj) {
040            return true;
041        }
042        // this class is final - do not need instanceof check.
043        if (obj == null) {
044            return false;
045        }
046        if (obj.getClass() == TypeAdapterKey.class) {
047            TypeAdapterKey key = (TypeAdapterKey) obj;
048            return key.input == input && key.output == output;
049        }
050        return false;
051    }
052
053    @Override
054    public String toString() {
055        return input + ":" + output;
056    }
057
058    @Override
059    public int hashCode() {
060        if (hashCode == 0) {
061            hashCode = createHashCode();
062        }
063        return hashCode;
064    }
065
066    protected int createHashCode() {
067        int result = input.hashCode() | output.hashCode();
068        return result == 0 ? 0xbabe : result;
069    }
070
071}