/*
* 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.
*/
package org.apache.clerezza.rdf.cris;
import java.util.Collection;
import java.util.Iterator;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryparser.classic.MultiFieldQueryParser;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.util.Version;
/**
* A generic condition using the Apache Lucene {@link QueryParser}.
*
* This supports full Lucene query syntax.
*
* @author daniel
*/
public class GenericCondition extends Condition {
private final MultiFieldQueryParser queryParser;
private final String searchQuery;
private final String[] fields;
/**
* Creates a new GenericCondition.
*
* Special characters in the query string are not escaped.
*
* @param properties the properties to search for.
* @param searchQuery the search string (pattern).
*/
public GenericCondition(Collection<VirtualProperty> properties, String searchQuery) {
this(properties, searchQuery, false);
}
/**
* Creates a new GenericCondition.
*
* @param properties the properties to search for.
* @param searchQuery the search string (pattern).
* @param escapeQuery whether to escape special characters in the query string or not.
*/
public GenericCondition(Collection<VirtualProperty> properties, String searchQuery, boolean escapeQuery) {
fields = new String[properties.size()];
Iterator<VirtualProperty> it = properties.iterator();
for(int i = 0; i < properties.size(); ++i) {
fields[i] = it.next().stringKey;
}
if(escapeQuery) {
searchQuery = QueryParser.escape(searchQuery);
}
this.searchQuery = searchQuery;
this.queryParser = new MultiFieldQueryParser(Version.LUCENE_41,
fields,
new StandardAnalyzer(Version.LUCENE_41));
queryParser.setAllowLeadingWildcard(true);
}
@Override
public Query query() {
try {
Query q = queryParser.parse(searchQuery);
return q;
} catch (ParseException ex) {
throw new RuntimeException(ex.getMessage());
}
}
}