001/*
002 *  Copyright 2017 Anyware Services
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 */
016package org.ametys.cms.search.query.join;
017
018import java.util.Optional;
019
020import org.ametys.cms.search.query.JoinQuery;
021import org.ametys.cms.search.query.Query;
022
023/**
024 * Class representing a join key and its (optional) nested query for creating a {@link JoinQuery}
025 */
026public class JoinKey
027{
028    private String _key;
029    private Optional<Query> _nestedQuery;
030    
031    /**
032     * Creates a JoinKey
033     * @param key The key. Cannot be null
034     * @param nestedQuery The nested query of the join key. Can be null
035     */
036    public JoinKey(String key, Query nestedQuery)
037    {
038        if (key == null)
039        {
040            throw new IllegalArgumentException("The key of the JoinKey cannot be null");
041        }
042        _key = key;
043        _nestedQuery = Optional.ofNullable(nestedQuery);
044    }
045    
046    /**
047     * Gets the key of the JoinKey
048     * @return the key of the JoinKey
049     */
050    public String getKey()
051    {
052        return _key;
053    }
054
055    /**
056     * Gets the optional nested query of the join key
057     * @return the optional nested query of the join key
058     */
059    public Optional<Query> getNestedQuery()
060    {
061        return _nestedQuery;
062    }
063
064    @Override
065    public int hashCode()
066    {
067        final int prime = 31;
068        int result = 1;
069        result = prime * result + ((_key == null) ? 0 : _key.hashCode());
070        result = prime * result + ((_nestedQuery == null) ? 0 : _nestedQuery.hashCode());
071        return result;
072    }
073
074    @Override
075    public boolean equals(Object obj)
076    {
077        if (this == obj)
078        {
079            return true;
080        }
081        if (obj == null)
082        {
083            return false;
084        }
085        if (getClass() != obj.getClass())
086        {
087            return false;
088        }
089        JoinKey other = (JoinKey) obj;
090        if (_key == null)
091        {
092            if (other._key != null)
093            {
094                return false;
095            }
096        }
097        else if (!_key.equals(other._key))
098        {
099            return false;
100        }
101        if (_nestedQuery == null)
102        {
103            if (other._nestedQuery != null)
104            {
105                return false;
106            }
107        }
108        else if (!_nestedQuery.equals(other._nestedQuery))
109        {
110            return false;
111        }
112        return true;
113    }
114    
115    @Override
116    public String toString()
117    {
118        return "JoinKey [key=" + _key + ", nestedQuery=" + _nestedQuery.map(Query::toString).orElse("<no nested query>") + "]";
119    }
120}