package org.apache.lucene.queryparser.xml.builders;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.ParserException;
import org.apache.lucene.queryparser.xml.QueryBuilder;
import org.apache.lucene.sandbox.queries.FuzzyLikeThisQuery;
import org.apache.lucene.sandbox.queries.SlowFuzzyQuery;
import org.apache.lucene.search.Query;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
/*
* 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.
*/
/**
* Builder for {@link FuzzyLikeThisQuery}
*/
public class FuzzyLikeThisQueryBuilder implements QueryBuilder {
private static final int DEFAULT_MAX_NUM_TERMS = 50;
private static final float DEFAULT_MIN_SIMILARITY = SlowFuzzyQuery.defaultMinSimilarity;
private static final int DEFAULT_PREFIX_LENGTH = 1;
private static final boolean DEFAULT_IGNORE_TF = false;
private final Analyzer analyzer;
public FuzzyLikeThisQueryBuilder(Analyzer analyzer) {
this.analyzer = analyzer;
}
@Override
public Query getQuery(Element e) throws ParserException {
NodeList nl = e.getElementsByTagName("Field");
int maxNumTerms = DOMUtils.getAttribute(e, "maxNumTerms", DEFAULT_MAX_NUM_TERMS);
FuzzyLikeThisQuery fbq = new FuzzyLikeThisQuery(maxNumTerms, analyzer);
fbq.setIgnoreTF(DOMUtils.getAttribute(e, "ignoreTF", DEFAULT_IGNORE_TF));
for (int i = 0; i < nl.getLength(); i++) {
Element fieldElem = (Element) nl.item(i);
float minSimilarity = DOMUtils.getAttribute(fieldElem, "minSimilarity", DEFAULT_MIN_SIMILARITY);
int prefixLength = DOMUtils.getAttribute(fieldElem, "prefixLength", DEFAULT_PREFIX_LENGTH);
String fieldName = DOMUtils.getAttributeWithInheritance(fieldElem, "fieldName");
String value = DOMUtils.getText(fieldElem);
fbq.addTerms(value, fieldName, minSimilarity, prefixLength);
}
fbq.setBoost(DOMUtils.getAttribute(e, "boost", 1.0f));
return fbq;
}
}