/**
* 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.BooleanQueryNode;
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.NodeBooleanQueryNode;
import org.sindice.siren.qparser.keyword.nodes.TwigQueryNode;
/**
* This processor converts a {@link BooleanQueryNode} into a {@link NodeBooleanQueryNode}.
* If {@link KeywordConfigurationKeys#ALLOW_TWIG} is <code>true</code>, only
* those within a {@link TwigQueryNode} are converted.
*
* @see NodeBooleanQueryNode
* @see KeywordConfigurationKeys#ALLOW_TWIG
*/
public class NodeBooleanQueryNodeProcessor
extends QueryNodeProcessorImpl {
/**
* Number of twigs
*/
private int nbTwigs = 0;
@Override
protected QueryNode preProcessNode(final QueryNode node)
throws QueryNodeException {
if (node instanceof TwigQueryNode) {
nbTwigs++;
} else if (node instanceof BooleanQueryNode) {
/*
* - if twig is allowed, convert the boolean querynode only if within a twig querynode
* - if twig is not allowed, convert ALL the boolean querynodes
*/
if (this.getQueryConfigHandler().has(KeywordConfigurationKeys.ALLOW_TWIG)) {
if (this.getQueryConfigHandler().get(KeywordConfigurationKeys.ALLOW_TWIG) &&
nbTwigs == 0) {
return node;
}
} else {
throw new IllegalArgumentException("KeywordConfigurationKeys.ALLOW_TWIG should be set on the KeywordQueryConfigHandler");
}
return new NodeBooleanQueryNode((BooleanQueryNode) node);
}
return node;
}
@Override
protected QueryNode postProcessNode(final QueryNode node)
throws QueryNodeException {
if (node instanceof TwigQueryNode) {
nbTwigs--;
assert nbTwigs >= 0;
}
return node;
}
@Override
protected List<QueryNode> setChildrenOrder(final List<QueryNode> children)
throws QueryNodeException {
return children;
}
}