pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/hi/HindiStemmer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/hi/HindiStemmer.java
new file mode 100644 (file)
index 0000000..68ef2cc
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/hi/HindiStemmer.java
@@ -0,0 +1,121 @@
+package org.apache.lucene.analysis.hi;
+
+/**
+ * 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 static org.apache.lucene.analysis.util.StemmerUtil.*;
+
+/**
+ * Light Stemmer for Hindi.
+ * <p>
+ * Implements the algorithm specified in:
+ * <i>A Lightweight Stemmer for Hindi</i>
+ * Ananthakrishnan Ramanathan and Durgesh D Rao.
+ * http://computing.open.ac.uk/Sites/EACLSouthAsia/Papers/p6-Ramanathan.pdf
+ * </p>
+ */
+public class HindiStemmer {
+  public int stem(char buffer[], int len) {
+    // 5
+    if ((len > 6) && (endsWith(buffer, len, "ाएंगी")
+        || endsWith(buffer, len, "ाएंगे")
+        || endsWith(buffer, len, "ाऊंगी")
+        || endsWith(buffer, len, "ाऊंगा")
+        || endsWith(buffer, len, "ाइयाँ")
+        || endsWith(buffer, len, "ाइयों")
+        || endsWith(buffer, len, "ाइयां")
+      ))
+      return len - 5;
+    
+    // 4
+    if ((len > 5) && (endsWith(buffer, len, "ाएगी")
+        || endsWith(buffer, len, "ाएगा")
+        || endsWith(buffer, len, "ाओगी")
+        || endsWith(buffer, len, "ाओगे")
+        || endsWith(buffer, len, "एंगी")
+        || endsWith(buffer, len, "ेंगी")
+        || endsWith(buffer, len, "एंगे")
+        || endsWith(buffer, len, "ेंगे")
+        || endsWith(buffer, len, "ूंगी")
+        || endsWith(buffer, len, "ूंगा")
+        || endsWith(buffer, len, "ातीं")
+        || endsWith(buffer, len, "नाओं")
+        || endsWith(buffer, len, "नाएं")
+        || endsWith(buffer, len, "ताओं")
+        || endsWith(buffer, len, "ताएं")
+        || endsWith(buffer, len, "ियाँ")
+        || endsWith(buffer, len, "ियों")
+        || endsWith(buffer, len, "ियां")
+        ))
+      return len - 4;
+    
+    // 3
+    if ((len > 4) && (endsWith(buffer, len, "ाकर")
+        || endsWith(buffer, len, "ाइए")
+        || endsWith(buffer, len, "ाईं")
+        || endsWith(buffer, len, "ाया")
+        || endsWith(buffer, len, "ेगी")
+        || endsWith(buffer, len, "ेगा")
+        || endsWith(buffer, len, "ोगी")
+        || endsWith(buffer, len, "ोगे")
+        || endsWith(buffer, len, "ाने")
+        || endsWith(buffer, len, "ाना")
+        || endsWith(buffer, len, "ाते")
+        || endsWith(buffer, len, "ाती")
+        || endsWith(buffer, len, "ाता")
+        || endsWith(buffer, len, "तीं")
+        || endsWith(buffer, len, "ाओं")
+        || endsWith(buffer, len, "ाएं")
+        || endsWith(buffer, len, "ुओं")
+        || endsWith(buffer, len, "ुएं")
+        || endsWith(buffer, len, "ुआं")
+        ))
+      return len - 3;
+    
+    // 2
+    if ((len > 3) && (endsWith(buffer, len, "कर")
+        || endsWith(buffer, len, "ाओ")
+        || endsWith(buffer, len, "िए")
+        || endsWith(buffer, len, "ाई")
+        || endsWith(buffer, len, "ाए")
+        || endsWith(buffer, len, "ने")
+        || endsWith(buffer, len, "नी")
+        || endsWith(buffer, len, "ना")
+        || endsWith(buffer, len, "ते")
+        || endsWith(buffer, len, "ीं")
+        || endsWith(buffer, len, "ती")
+        || endsWith(buffer, len, "ता")
+        || endsWith(buffer, len, "ाँ")
+        || endsWith(buffer, len, "ां")
+        || endsWith(buffer, len, "ों")
+        || endsWith(buffer, len, "ें")
+        ))
+      return len - 2;
+    
+    // 1
+    if ((len > 2) && (endsWith(buffer, len, "ो")
+        || endsWith(buffer, len, "े")
+        || endsWith(buffer, len, "ू")
+        || endsWith(buffer, len, "ु")
+        || endsWith(buffer, len, "ी")
+        || endsWith(buffer, len, "ि")
+        || endsWith(buffer, len, "ा")
+       ))
+      return len - 1;
+    return len;
+  }
+}