content: 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;
    }
  }
  