pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / analyzers / common / src / java / org / apache / lucene / analysis / gl / GalicianStemmer.java

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/gl/GalicianStemmer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/gl/GalicianStemmer.java
new file mode 100644 (file)
index 0000000..ba2ffb3
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/gl/GalicianStemmer.java
@@ -0,0 +1,83 @@
+package org.apache.lucene.analysis.gl;
+
+/**
+ * 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 java.util.Map;
+
+import org.apache.lucene.analysis.pt.RSLPStemmerBase;
+
+/**
+ * Galician stemmer implementing "Regras do lematizador para o galego".
+ * 
+ * @see RSLPStemmerBase
+ * @see <a href="http://bvg.udc.es/recursos_lingua/stemming.jsp">Description of rules</a>
+ */
+public class GalicianStemmer extends RSLPStemmerBase {
+  private static final Step plural, unification, adverb, augmentative, noun, verb, vowel;
+  
+  static {
+    Map<String,Step> steps = parse(GalicianStemmer.class, "galician.rslp");
+    plural = steps.get("Plural");
+    unification = steps.get("Unification");
+    adverb = steps.get("Adverb");
+    augmentative = steps.get("Augmentative");
+    noun = steps.get("Noun");
+    verb = steps.get("Verb");
+    vowel = steps.get("Vowel");
+  }
+  
+  /**
+   * @param s buffer, oversized to at least <code>len+1</code>
+   * @param len initial valid length of buffer
+   * @return new valid length, stemmed
+   */
+  public int stem(char s[], int len) {
+    assert s.length >= len + 1 : "this stemmer requires an oversized array of at least 1";
+    
+    len = plural.apply(s, len);
+    len = unification.apply(s, len);
+    len = adverb.apply(s, len);
+    
+    int oldlen;
+    do {
+      oldlen = len;
+      len = augmentative.apply(s, len);
+    } while (len != oldlen);
+    
+    oldlen = len;
+    len = noun.apply(s, len);
+    if (len == oldlen) { /* suffix not removed */
+      len = verb.apply(s, len);
+    }
+      
+    len = vowel.apply(s, len);
+    
+    // RSLG accent removal
+    for (int i = 0; i < len; i++)
+      switch(s[i]) {
+        case 'á': s[i] = 'a'; break;
+        case 'é':
+        case 'ê': s[i] = 'e'; break;
+        case 'í': s[i] = 'i'; break;
+        case 'ó': s[i] = 'o'; break;
+        case 'ú': s[i] = 'u'; break;
+      }
+    
+    return len;
+  }
+}