package org.apache.lucene.queryParser.core.nodes;
/**
* 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.ArrayList;
import java.util.List;
import org.apache.lucene.messages.MessageImpl;
import org.apache.lucene.queryParser.core.QueryNodeError;
import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
/**
* A {@link GroupQueryNode} represents a location where the original user typed
* real parenthesis on the query string. This class is useful for queries like:
* a) a AND b OR c b) ( a AND b) OR c
*
* Parenthesis might be used to define the boolean operation precedence.
*/
public class GroupQueryNode extends QueryNodeImpl {
private static final long serialVersionUID = -9204673493869114999L;
/**
* This QueryNode is used to identify parenthesis on the original query string
*/
public GroupQueryNode(QueryNode query) {
if (query == null) {
throw new QueryNodeError(new MessageImpl(
QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));
}
allocate();
setLeaf(false);
add(query);
}
public QueryNode getChild() {
return getChildren().get(0);
}
@Override
public String toString() {
return "<group>" + "\n" + getChild().toString() + "\n</group>";
}
public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
if (getChild() == null)
return "";
return "( " + getChild().toQueryString(escapeSyntaxParser) + " )";
}
@Override
public QueryNode cloneTree() throws CloneNotSupportedException {
GroupQueryNode clone = (GroupQueryNode) super.cloneTree();
return clone;
}
/**
* @param child
*/
public void setChild(QueryNode child) {
List<QueryNode> list = new ArrayList<QueryNode>();
list.add(child);
this.set(list);
}
}