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The source code

package org.apache.lucene.analysis;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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;

/**
 * LowerCaseTokenizer performs the function of LetterTokenizer
 * and LowerCaseFilter together.  It divides text at non-letters and converts
 * them to lower case.  While it is functionally equivalent to the combination
 * of LetterTokenizer and LowerCaseFilter, there is a performance advantage
 * to doing the two tasks at once, hence this (redundant) implementation.
 * 

* Note: this does a decent job for most European languages, but does a terrible * job for some Asian languages, where words are not separated by spaces. */ public final class LowerCaseTokenizer extends LetterTokenizer { /** Construct a new LowerCaseTokenizer. */ public LowerCaseTokenizer(Reader in) { super(in); } /** Collects only characters which satisfy * {@link Character#isLetter(char)}.*/ protected char normalize(char c) { return Character.toLowerCase(c); } }

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