pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.4.0 / lucene / contrib / analyzers / common / src / java / org / apache / lucene / analysis / cz / CzechStemmer.java

diff --git a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/cz/CzechStemmer.java b/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/cz/CzechStemmer.java
deleted file mode 100644 (file)
index 32980cc..0000000
--- a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/cz/CzechStemmer.java
+++ /dev/null
@@ -1,171 +0,0 @@
-package org.apache.lucene.analysis.cz;
-
-/**
- * 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 static org.apache.lucene.analysis.util.StemmerUtil.*;
-
-/**
- * Light Stemmer for Czech.
- * <p>
- * Implements the algorithm described in:  
- * <i>
- * Indexing and stemming approaches for the Czech language
- * </i>
- * http://portal.acm.org/citation.cfm?id=1598600
- * </p>
- */
-public class CzechStemmer {
-  
-  /**
-   * Stem an input buffer of Czech text.
-   * 
-   * @param s input buffer
-   * @param len length of input buffer
-   * @return length of input buffer after normalization
-   * 
-   * <p><b>NOTE</b>: Input is expected to be in lowercase, 
-   * but with diacritical marks</p>
-   */
-  public int stem(char s[], int len) {
-    len = removeCase(s, len);
-    len = removePossessives(s, len);
-    len = normalize(s, len);
-    return len;
-  }
-  
-  private int removeCase(char s[], int len) {  
-    if (len > 7 && endsWith(s, len, "atech"))
-      return len - 5;
-    
-    if (len > 6 && 
-        (endsWith(s, len,"ětem") ||
-        endsWith(s, len,"etem") ||
-        endsWith(s, len,"atům")))
-      return len - 4;
-        
-    if (len > 5 && 
-        (endsWith(s, len, "ech") ||
-        endsWith(s, len, "ich") ||
-        endsWith(s, len, "ích") ||
-        endsWith(s, len, "ého") ||
-        endsWith(s, len, "ěmi") ||
-        endsWith(s, len, "emi") ||
-        endsWith(s, len, "ému") ||
-        endsWith(s, len, "ěte") ||
-        endsWith(s, len, "ete") ||
-        endsWith(s, len, "ěti") ||
-        endsWith(s, len, "eti") ||
-        endsWith(s, len, "ího") ||
-        endsWith(s, len, "iho") ||
-        endsWith(s, len, "ími") ||
-        endsWith(s, len, "ímu") ||
-        endsWith(s, len, "imu") ||
-        endsWith(s, len, "ách") ||
-        endsWith(s, len, "ata") ||
-        endsWith(s, len, "aty") ||
-        endsWith(s, len, "ých") ||
-        endsWith(s, len, "ama") ||
-        endsWith(s, len, "ami") ||
-        endsWith(s, len, "ové") ||
-        endsWith(s, len, "ovi") ||
-        endsWith(s, len, "ými")))
-      return len - 3;
-    
-    if (len > 4 && 
-        (endsWith(s, len, "em") ||
-        endsWith(s, len, "es") ||
-        endsWith(s, len, "ém") ||
-        endsWith(s, len, "ím") ||
-        endsWith(s, len, "ům") ||
-        endsWith(s, len, "at") ||
-        endsWith(s, len, "ám") ||
-        endsWith(s, len, "os") ||
-        endsWith(s, len, "us") ||
-        endsWith(s, len, "ým") ||
-        endsWith(s, len, "mi") ||
-        endsWith(s, len, "ou")))
-      return len - 2;
-    
-    if (len > 3) {
-      switch (s[len - 1]) {
-        case 'a':
-        case 'e':
-        case 'i':
-        case 'o':
-        case 'u':
-        case 'ů':
-        case 'y':
-        case 'á':
-        case 'é':
-        case 'í':
-        case 'ý':
-        case 'ě':
-          return len - 1;
-      }
-    }
-    
-    return len;
-  }
-  
-  private int removePossessives(char s[], int len) {
-    if (len > 5 &&
-        (endsWith(s, len, "ov") ||
-        endsWith(s, len, "in") ||
-        endsWith(s, len, "ův")))
-      return len - 2;
-
-    return len;
-  }
-  
-  private int normalize(char s[], int len) {
-    if (endsWith(s, len, "čt")) { // čt -> ck
-      s[len - 2] = 'c';
-      s[len - 1] = 'k';
-      return len;
-    }
-    
-    if (endsWith(s, len, "št")) { // št -> sk
-      s[len - 2] = 's';
-      s[len - 1] = 'k';
-      return len;
-    }
-    
-    switch(s[len - 1]) {
-      case 'c': // [cč] -> k
-      case 'č':
-        s[len - 1] = 'k';
-        return len;
-      case 'z': // [zž] -> h
-      case 'ž':
-        s[len - 1] = 'h';
-        return len;
-    }
-    
-    if (len > 1 && s[len - 2] == 'e') {
-      s[len - 2] = s[len - 1]; // e* > *
-      return len - 1;
-    }
-    
-    if (len > 2 && s[len - 2] == 'ů') {
-      s[len - 2] = 'o'; // *ů* -> *o*
-      return len;
-    }
-
-    return len;
-  }
-}