/**
* 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.keyword.processors;
import java.util.List;
import org.apache.lucene.queryparser.flexible.core.QueryNodeException;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl;
import org.sindice.siren.qparser.keyword.config.KeywordQueryConfigHandler.KeywordConfigurationKeys;
import org.sindice.siren.qparser.keyword.nodes.TwigQueryNode;
/**
* This processor sets the level of the root of the {@link TwigQueryNode}.
*
* @see TwigQueryNode#setRootLevel(int)
*/
public class RootLevelTwigQueryNodeProcessor
extends QueryNodeProcessorImpl {
private final int DEFAULT_ROOT = 1;
@Override
protected QueryNode preProcessNode(final QueryNode node)
throws QueryNodeException {
if (node instanceof TwigQueryNode) {
final int root;
if (this.getQueryConfigHandler().has(KeywordConfigurationKeys.ROOT_LEVEL)) {
root = this.getQueryConfigHandler().get(KeywordConfigurationKeys.ROOT_LEVEL);
} else {
root = DEFAULT_ROOT;
}
// Set the ROOT level of the query
/*
* When adding nested TwigQueries, their root level is set to the current
* Twig level + 1. See {@link TwigQuery#addChild}.
*/
final TwigQueryNode twigNode = (TwigQueryNode) node;
twigNode.setRootLevel(root);
}
return node;
}
@Override
protected QueryNode postProcessNode(final QueryNode node)
throws QueryNodeException {
return node;
}
@Override
protected List<QueryNode> setChildrenOrder(final List<QueryNode> children)
throws QueryNodeException {
return children;
}
}