/**
* Copyright 2014 National University of Ireland, Galway.
*
* This file is part of the SIREn project. Project and contact information:
*
* https://github.com/rdelbru/SIREn
*
* 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.sindice.siren.qparser.json.dsl;
import java.util.ArrayList;
import java.util.List;
import org.apache.lucene.queryparser.flexible.core.QueryNodeException;
import org.apache.lucene.search.Query;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.node.ArrayNode;
import org.codehaus.jackson.node.ObjectNode;
import org.sindice.siren.qparser.json.dsl.QueryClause.Occur;
import org.sindice.siren.qparser.json.parser.BooleanPropertyParser;
import org.sindice.siren.qparser.json.parser.OccurPropertyParser;
import org.sindice.siren.search.node.LuceneProxyNodeQuery;
/**
* Class that represents a boolean query object of the JSON query syntax.
*/
public class BooleanQuery extends AbstractQuery {
private final List<QueryClause> clauses;
BooleanQuery(final ObjectMapper mapper) {
super(mapper);
clauses = new ArrayList<QueryClause>();
}
@Override
public BooleanQuery setBoost(final float boost) {
throw new UnsupportedOperationException("Boost on BooleanQuery not supported");
}
/**
* Adds a boolean clause with a
* {@link org.apache.lucene.search.BooleanClause.Occur#MUST} operator.
* <p>
* Use this method for clauses that must appear in the matching documents.
*
* @see {@link org.apache.lucene.search.BooleanClause.Occur#MUST}
*/
public BooleanQuery with(final AbstractNodeQuery node) {
clauses.add(new BasicQueryClause(node, Occur.MUST));
return this;
}
/**
* Adds a boolean clause with a
* {@link org.apache.lucene.search.BooleanClause.Occur#MUST_NOT} operator.
* <p>
* Use this method for clauses that must not appear in the matching documents.
*
* @see {@link org.apache.lucene.search.BooleanClause.Occur#MUST}
*/
public BooleanQuery without(final AbstractNodeQuery node) {
clauses.add(new BasicQueryClause(node, Occur.MUST_NOT));
return this;
}
/**
* Adds a boolean clause with a
* {@link org.apache.lucene.search.BooleanClause.Occur#SHOULD} operator.
* <p>
* Use this method for clauses that should appear in the matching documents.
*
* @see {@link org.apache.lucene.search.BooleanClause.Occur#SHOULD}
*/
public BooleanQuery optional(final AbstractNodeQuery node) {
clauses.add(new BasicQueryClause(node, Occur.SHOULD));
return this;
}
@Override
public org.apache.lucene.search.BooleanQuery toQuery(final boolean proxy) throws QueryNodeException {
final org.apache.lucene.search.BooleanQuery query = new org.apache.lucene.search.BooleanQuery(true);
// convert clauses
for (final QueryClause clause : clauses) {
// wrap node query into a lucene proxy query
final Query q = new LuceneProxyNodeQuery((org.sindice.siren.search.node.NodeQuery) clause.getQuery().toQuery(false));
query.add(q, clause.getBooleanOccur());
}
// add boost
if (this.hasBoost()) {
query.setBoost(this.getBoost());
}
return query;
}
@Override
ObjectNode toJson() {
final ObjectNode obj = mapper.createObjectNode();
final ArrayNode bool = obj.putArray(BooleanPropertyParser.BOOLEAN_PROPERTY);
for (final QueryClause clause : clauses) {
final ObjectNode e = bool.addObject();
e.put(OccurPropertyParser.OCCUR_PROPERTY, clause.getOccur().toString());
e.putAll(clause.getQuery().toJson());
}
return obj;
}
}