pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/en/EnglishPossessiveFilter.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/en/EnglishPossessiveFilter.java
new file mode 100644 (file)
index 0000000..7653248
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/en/EnglishPossessiveFilter.java
@@ -0,0 +1,52 @@
+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.
+ */
+
+import java.io.IOException;
+
+import org.apache.lucene.analysis.TokenFilter;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+
+/**
+ * TokenFilter that removes possessives (trailing 's) from words.
+ */
+public final class EnglishPossessiveFilter extends TokenFilter {
+  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
+
+  public EnglishPossessiveFilter(TokenStream input) {
+    super(input);
+  }
+
+  @Override
+  public boolean incrementToken() throws IOException {
+    if (!input.incrementToken()) {
+      return false;
+    }
+    
+    final char[] buffer = termAtt.buffer();
+    final int bufferLength = termAtt.length();
+    
+    if (bufferLength >= 2 &&
+        buffer[bufferLength-2] == '\'' &&
+        (buffer[bufferLength-1] == 's' || buffer[bufferLength-1] == 'S'))
+      termAtt.setLength(bufferLength - 2); // Strip last 2 characters off
+
+    return true;
+  }
+}