content: package org.apache.lucene.analysis.en;
  
  /**
   * 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.
   */
  
  /**
   * Minimal plural stemmer for English.
   * <p>
   * This stemmer implements the "S-Stemmer" from
   * <i>How Effective Is Suffixing?</i>
   * Donna Harman.
   */
  public class EnglishMinimalStemmer {
    @SuppressWarnings("fallthrough")
    public int stem(char s[], int len) {
      if (len < 3 || s[len-1] != 's')
        return len;
      
      switch(s[len-2]) {
        case 'u':
        case 's': return len;
        case 'e':
          if (len > 3 && s[len-3] == 'i' && s[len-4] != 'a' && s[len-4] != 'e') {
            s[len - 3] = 'y';
            return len - 2;
          }
          if (s[len-3] == 'i' || s[len-3] == 'a' || s[len-3] == 'o' || s[len-3] == 'e')
            return len; /* intentional fallthrough */
        default: return len - 1;
      }
    }
  }
  