package org.apache.lucene.queryParser.standard.builders;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.util.List;
import org.apache.lucene.messages.MessageImpl;
import org.apache.lucene.queryParser.core.QueryNodeException;
import org.apache.lucene.queryParser.core.builders.QueryTreeBuilder;
import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
import org.apache.lucene.queryParser.core.nodes.BooleanQueryNode;
import org.apache.lucene.queryParser.core.nodes.ModifierQueryNode;
import org.apache.lucene.queryParser.core.nodes.QueryNode;
import org.apache.lucene.queryParser.standard.parser.EscapeQuerySyntaxImpl;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.BooleanQuery.TooManyClauses;
/**
* Builds a {@link BooleanQuery} object from a {@link BooleanQueryNode} object.
* Every children in the {@link BooleanQueryNode} object must be already tagged
* using {@link QueryTreeBuilder#QUERY_TREE_BUILDER_TAGID} with a {@link Query}
* object. <br/>
* <br/>
* It takes in consideration if the children is a {@link ModifierQueryNode} to
* define the {@link BooleanClause}.
*/
public class BooleanQueryNodeBuilder implements StandardQueryBuilder {
public BooleanQueryNodeBuilder() {
// empty constructor
}
public BooleanQuery build(QueryNode queryNode) throws QueryNodeException {
BooleanQueryNode booleanNode = (BooleanQueryNode) queryNode;
BooleanQuery bQuery = new BooleanQuery();
List<QueryNode> children = booleanNode.getChildren();
if (children != null) {
for (QueryNode child : children) {
Object obj = child.getTag(QueryTreeBuilder.QUERY_TREE_BUILDER_TAGID);
if (obj != null) {
Query query = (Query) obj;
try {
bQuery.add(query, getModifierValue(child));
} catch (TooManyClauses ex) {
throw new QueryNodeException(new MessageImpl(
QueryParserMessages.TOO_MANY_BOOLEAN_CLAUSES, BooleanQuery
.getMaxClauseCount(), queryNode
.toQueryString(new EscapeQuerySyntaxImpl())), ex);
}
}
}
}
return bQuery;
}
private static BooleanClause.Occur getModifierValue(QueryNode node)
throws QueryNodeException {
if (node instanceof ModifierQueryNode) {
ModifierQueryNode mNode = ((ModifierQueryNode) node);
switch (mNode.getModifier()) {
case MOD_REQ:
return BooleanClause.Occur.MUST;
case MOD_NOT:
return BooleanClause.Occur.MUST_NOT;
case MOD_NONE:
return BooleanClause.Occur.SHOULD;
}
}
return BooleanClause.Occur.SHOULD;
}
}