pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/en/EnglishMinimalStemmer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/en/EnglishMinimalStemmer.java
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+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;
+    }
+  }
+}