X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/sv/SwedishLightStemmer.java?ds=sidebyside diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/sv/SwedishLightStemmer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/sv/SwedishLightStemmer.java new file mode 100644 index 0000000..036ba5f --- /dev/null +++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/sv/SwedishLightStemmer.java @@ -0,0 +1,111 @@ +package org.apache.lucene.analysis.sv; + +/** + * 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. + */ + +import static org.apache.lucene.analysis.util.StemmerUtil.*; + +/** + * Light Stemmer for Swedish. + *

+ * This stemmer implements the algorithm described in: + * Report on CLEF-2003 Monolingual Tracks + * Jacques Savoy + */ +public class SwedishLightStemmer { + + public int stem(char s[], int len) { + if (len > 4 && s[len-1] == 's') + len--; + + if (len > 7 && + (endsWith(s, len, "elser") || + endsWith(s, len, "heten"))) + return len - 5; + + if (len > 6 && + (endsWith(s, len, "arne") || + endsWith(s, len, "erna") || + endsWith(s, len, "ande") || + endsWith(s, len, "else") || + endsWith(s, len, "aste") || + endsWith(s, len, "orna") || + endsWith(s, len, "aren"))) + return len - 4; + + if (len > 5 && + (endsWith(s, len, "are") || + endsWith(s, len, "ast") || + endsWith(s, len, "het"))) + return len - 3; + + if (len > 4 && + (endsWith(s, len, "ar") || + endsWith(s, len, "er") || + endsWith(s, len, "or") || + endsWith(s, len, "en") || + endsWith(s, len, "at") || + endsWith(s, len, "te") || + endsWith(s, len, "et"))) + return len - 2; + + if (len > 3) + switch(s[len-1]) { + case 't': + case 'a': + case 'e': + case 'n': return len - 1; + } + + return len; + } +}