package org.apache.lucene.analysis.ngram;
/*
* 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.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.NGramTokenFilter;
import org.apache.lucene.analysis.util.TokenFilterFactory;
/**
* Factory for {@link NGramTokenFilter}.
* <pre class="prettyprint" >
* <fieldType name="text_ngrm" class="solr.TextField" positionIncrementGap="100">
* <analyzer>
* <tokenizer class="solr.WhitespaceTokenizerFactory"/>
* <filter class="solr.NGramFilterFactory" minGramSize="1" maxGramSize="2"/>
* </analyzer>
* </fieldType></pre>
*
*/
public class NGramFilterFactory extends TokenFilterFactory {
private int maxGramSize = 0;
private int minGramSize = 0;
/** Initialize the n-gram min and max sizes and the side from which one should start tokenizing. */
@Override
public void init(Map<String, String> args) {
super.init(args);
String maxArg = args.get("maxGramSize");
maxGramSize = (maxArg != null ? Integer.parseInt(maxArg)
: NGramTokenFilter.DEFAULT_MAX_NGRAM_SIZE);
String minArg = args.get("minGramSize");
minGramSize = (minArg != null ? Integer.parseInt(minArg)
: NGramTokenFilter.DEFAULT_MIN_NGRAM_SIZE);
}
@Override
public NGramTokenFilter create(TokenStream input) {
return new NGramTokenFilter(input, minGramSize, maxGramSize);
}
}