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Hibernate Search Analyzer Framework based on Apache Solr

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// 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 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 );
	}
}