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package org.apache.lucene.analysis.de;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* This algorithm is updated based on code located at:
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* http://members.unine.ch/jacques.savoy/clef/
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* Full copyright for that code follows:
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* Copyright (c) 2005, Jacques Savoy
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer. Redistributions in binary
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* form must reproduce the above copyright notice, this list of conditions and
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* the following disclaimer in the documentation and/or other materials
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* provided with the distribution. Neither the name of the author nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* Minimal Stemmer for German.
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* This stemmer implements the following algorithm:
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* <i>Morphologie et recherche d'information</i>
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public class GermanMinimalStemmer {
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public int stem(char s[], int len) {
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for (int i = 0; i < len; i++)
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case 'ä': s[i] = 'a'; break;
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case 'ö': s[i] = 'o'; break;
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case 'ü': s[i] = 'u'; break;
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if (len > 6 && s[len-3] == 'n' && s[len-2] == 'e' && s[len-1] == 'n')
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case 'n': if (s[len-2] == 'e') return len - 2; else break;
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case 'e': if (s[len-2] == 's') return len - 2; else break;
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case 's': if (s[len-2] == 'e') return len - 2; else break;
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case 'r': if (s[len-2] == 'e') return len - 2; else break;
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case 'r': return len - 1;