// original code from Apache Solr - ported to work with Lucene 3.x and reformatted to Search coding style
package org.apache.solr.analysis;
/**
* 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.io.Reader;
import java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
/**
* Creates new instances of {@link NGramTokenizer}.
*/
public class NGramTokenizerFactory extends BaseTokenizerFactory {
private int maxGramSize = 0;
private int minGramSize = 0;
/**
* Initializes 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 ) : NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE );
String minArg = args.get( "minGramSize" );
minGramSize = ( minArg != null ? Integer.parseInt( minArg ) : NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE );
}
/**
* Creates the {@link TokenStream} of n-grams from the given {@link Reader}.
*/
public NGramTokenizer create(Reader input) {
return new NGramTokenizer( input, minGramSize, maxGramSize );
}
}