pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/id/IndonesianStemFilter.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/id/IndonesianStemFilter.java
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/id/IndonesianStemFilter.java
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+package org.apache.lucene.analysis.id;
+
+/**
+ * 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;
+import org.apache.lucene.analysis.tokenattributes.KeywordAttribute;
+
+/**
+ * A {@link TokenFilter} that applies {@link IndonesianStemmer} to stem Indonesian words.
+ */
+public final class IndonesianStemFilter extends TokenFilter {
+  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
+  private final KeywordAttribute keywordAtt = addAttribute(KeywordAttribute.class);
+  private final IndonesianStemmer stemmer = new IndonesianStemmer();
+  private final boolean stemDerivational;
+
+  /**
+   * Calls {@link #IndonesianStemFilter(TokenStream, boolean) IndonesianStemFilter(input, true)}
+   */
+  public IndonesianStemFilter(TokenStream input) {
+    this(input, true);
+  }
+  
+  /**
+   * Create a new IndonesianStemFilter.
+   * <p>
+   * If <code>stemDerivational</code> is false, 
+   * only inflectional suffixes (particles and possessive pronouns) are stemmed.
+   */
+  public IndonesianStemFilter(TokenStream input, boolean stemDerivational) {
+    super(input);
+    this.stemDerivational = stemDerivational;
+  }
+
+  @Override
+  public boolean incrementToken() throws IOException {
+    if (input.incrementToken()) {
+      if(!keywordAtt.isKeyword()) {
+        final int newlen = 
+          stemmer.stem(termAtt.buffer(), termAtt.length(), stemDerivational);
+        termAtt.setLength(newlen);
+      }
+      return true;
+    } else {
+      return false;
+    }
+  }
+}