package org.apache.lucene.queryParser.standard.processors;
/**
* 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.queryParser.core.QueryNodeException;
import org.apache.lucene.queryParser.core.nodes.FieldQueryNode;
import org.apache.lucene.queryParser.core.nodes.MatchAllDocsQueryNode;
import org.apache.lucene.queryParser.core.nodes.QueryNode;
import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
import org.apache.lucene.queryParser.standard.nodes.WildcardQueryNode;
import org.apache.lucene.search.MatchAllDocsQuery;
/**
* This processor converts every {@link WildcardQueryNode} that is "*:*" to
* {@link MatchAllDocsQueryNode}.
*
* @see MatchAllDocsQueryNode
* @see MatchAllDocsQuery
*/
public class MatchAllDocsQueryNodeProcessor extends QueryNodeProcessorImpl {
public MatchAllDocsQueryNodeProcessor() {
// empty constructor
}
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
if (node instanceof FieldQueryNode) {
FieldQueryNode fqn = (FieldQueryNode) node;
if (fqn.getField().toString().equals("*")
&& fqn.getText().toString().equals("*")) {
return new MatchAllDocsQueryNode();
}
}
return node;
}
protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
return node;
}
protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
throws QueryNodeException {
return children;
}
}