pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/fa/PersianNormalizer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/fa/PersianNormalizer.java
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/fa/PersianNormalizer.java
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+package org.apache.lucene.analysis.fa;
+
+/**
+ * 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.*;
+
+/**
+ * Normalizer for Persian.
+ * <p>
+ * Normalization is done in-place for efficiency, operating on a termbuffer.
+ * <p>
+ * Normalization is defined as:
+ * <ul>
+ * <li>Normalization of various heh + hamza forms and heh goal to heh.
+ * <li>Normalization of farsi yeh and yeh barree to arabic yeh
+ * <li>Normalization of persian keheh to arabic kaf
+ * </ul>
+ * 
+ */
+public class PersianNormalizer {
+  public static final char YEH = '\u064A';
+
+  public static final char FARSI_YEH = '\u06CC';
+
+  public static final char YEH_BARREE = '\u06D2';
+
+  public static final char KEHEH = '\u06A9';
+
+  public static final char KAF = '\u0643';
+
+  public static final char HAMZA_ABOVE = '\u0654';
+
+  public static final char HEH_YEH = '\u06C0';
+
+  public static final char HEH_GOAL = '\u06C1';
+
+  public static final char HEH = '\u0647';
+
+  /**
+   * Normalize an input buffer of Persian text
+   * 
+   * @param s input buffer
+   * @param len length of input buffer
+   * @return length of input buffer after normalization
+   */
+  public int normalize(char s[], int len) {
+
+    for (int i = 0; i < len; i++) {
+      switch (s[i]) {
+      case FARSI_YEH:
+      case YEH_BARREE:
+        s[i] = YEH;
+        break;
+      case KEHEH:
+        s[i] = KAF;
+        break;
+      case HEH_YEH:
+      case HEH_GOAL:
+        s[i] = HEH;
+        break;
+      case HAMZA_ABOVE: // necessary for HEH + HAMZA
+        len = delete(s, i, len);
+        i--;
+        break;
+      default:
+        break;
+      }
+    }
+
+    return len;
+  }
+}