+++ /dev/null
-package org.apache.lucene.analysis.de;
-
-/**
- * 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.
- */
-
-/*
- * This algorithm is updated based on code located at:
- * http://members.unine.ch/jacques.savoy/clef/
- *
- * Full copyright for that code follows:
- */
-
-/*
- * Copyright (c) 2005, Jacques Savoy
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer. Redistributions in binary
- * form must reproduce the above copyright notice, this list of conditions and
- * the following disclaimer in the documentation and/or other materials
- * provided with the distribution. Neither the name of the author nor the names
- * of its contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * Light Stemmer for German.
- * <p>
- * This stemmer implements the "UniNE" algorithm in:
- * <i>Light Stemming Approaches for the French, Portuguese, German and Hungarian Languages</i>
- * Jacques Savoy
- */
-public class GermanLightStemmer {
-
- public int stem(char s[], int len) {
- for (int i = 0; i < len; i++)
- switch(s[i]) {
- case 'ä':
- case 'à':
- case 'á':
- case 'â': s[i] = 'a'; break;
- case 'ö':
- case 'ò':
- case 'ó':
- case 'ô': s[i] = 'o'; break;
- case 'ï':
- case 'ì':
- case 'í':
- case 'î': s[i] = 'i'; break;
- case 'ü':
- case 'ù':
- case 'ú':
- case 'û': s[i] = 'u'; break;
- }
-
- len = step1(s, len);
- return step2(s, len);
- }
-
- private boolean stEnding(char ch) {
- switch(ch) {
- case 'b':
- case 'd':
- case 'f':
- case 'g':
- case 'h':
- case 'k':
- case 'l':
- case 'm':
- case 'n':
- case 't': return true;
- default: return false;
- }
- }
-
- private int step1(char s[], int len) {
- if (len > 5 && s[len-3] == 'e' && s[len-2] == 'r' && s[len-1] == 'n')
- return len - 3;
-
- if (len > 4 && s[len-2] == 'e')
- switch(s[len-1]) {
- case 'm':
- case 'n':
- case 'r':
- case 's': return len - 2;
- }
-
- if (len > 3 && s[len-1] == 'e')
- return len - 1;
-
- if (len > 3 && s[len-1] == 's' && stEnding(s[len-2]))
- return len - 1;
-
- return len;
- }
-
- private int step2(char s[], int len) {
- if (len > 5 && s[len-3] == 'e' && s[len-2] == 's' && s[len-1] == 't')
- return len - 3;
-
- if (len > 4 && s[len-2] == 'e' && (s[len-1] == 'r' || s[len-1] == 'n'))
- return len - 2;
-
- if (len > 4 && s[len-2] == 's' && s[len-1] == 't' && stEnding(s[len-3]))
- return len - 2;
-
- return len;
- }
-}
fnp / pylucene.git / blobdiff