pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.4.0 / lucene / contrib / analyzers / common / src / java / org / apache / lucene / analysis / tr / TurkishLowerCaseFilter.java

diff --git a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/tr/TurkishLowerCaseFilter.java b/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/tr/TurkishLowerCaseFilter.java
deleted file mode 100644 (file)
index 923c4fc..0000000
--- a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/tr/TurkishLowerCaseFilter.java
+++ /dev/null
@@ -1,124 +0,0 @@
-package org.apache.lucene.analysis.tr;
-
-/**
- * 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;
-
-/**
- * Normalizes Turkish token text to lower case.
- * <p>
- * Turkish and Azeri have unique casing behavior for some characters. This
- * filter applies Turkish lowercase rules. For more information, see <a
- * href="http://en.wikipedia.org/wiki/Turkish_dotted_and_dotless_I"
- * >http://en.wikipedia.org/wiki/Turkish_dotted_and_dotless_I</a>
- * </p>
- */
-public final class TurkishLowerCaseFilter extends TokenFilter {
-  private static final int LATIN_CAPITAL_LETTER_I = '\u0049';
-  private static final int LATIN_SMALL_LETTER_I = '\u0069';
-  private static final int LATIN_SMALL_LETTER_DOTLESS_I = '\u0131';
-  private static final int COMBINING_DOT_ABOVE = '\u0307';
-  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
-  
-  /**
-   * Create a new TurkishLowerCaseFilter, that normalizes Turkish token text 
-   * to lower case.
-   * 
-   * @param in TokenStream to filter
-   */
-  public TurkishLowerCaseFilter(TokenStream in) {
-    super(in);
-  }
-  
-  @Override
-  public final boolean incrementToken() throws IOException {
-    boolean iOrAfter = false;
-    
-    if (input.incrementToken()) {
-      final char[] buffer = termAtt.buffer();
-      int length = termAtt.length();
-      for (int i = 0; i < length;) {
-        final int ch = Character.codePointAt(buffer, i);
-    
-        iOrAfter = (ch == LATIN_CAPITAL_LETTER_I || 
-            (iOrAfter && Character.getType(ch) == Character.NON_SPACING_MARK));
-        
-        if (iOrAfter) { // all the special I turkish handling happens here.
-          switch(ch) {
-            // remove COMBINING_DOT_ABOVE to mimic composed lowercase
-            case COMBINING_DOT_ABOVE:
-              length = delete(buffer, i, length);
-              continue;
-            // i itself, it depends if it is followed by COMBINING_DOT_ABOVE
-            // if it is, we will make it small i and later remove the dot
-            case LATIN_CAPITAL_LETTER_I:
-              if (isBeforeDot(buffer, i + 1, length)) {
-                buffer[i] = LATIN_SMALL_LETTER_I;
-              } else {
-                buffer[i] = LATIN_SMALL_LETTER_DOTLESS_I;
-                // below is an optimization. no COMBINING_DOT_ABOVE follows,
-                // so don't waste time calculating Character.getType(), etc
-                iOrAfter = false;
-              }
-              i++;
-              continue;
-          }
-        }
-        
-        i += Character.toChars(Character.toLowerCase(ch), buffer, i);
-      }
-      
-      termAtt.setLength(length);
-      return true;
-    } else
-      return false;
-  }
-  
-  
-  /**
-   * lookahead for a combining dot above.
-   * other NSMs may be in between.
-   */
-  private boolean isBeforeDot(char s[], int pos, int len) {
-    for (int i = pos; i < len;) {
-      final int ch = Character.codePointAt(s, i);
-      if (Character.getType(ch) != Character.NON_SPACING_MARK)
-        return false;
-      if (ch == COMBINING_DOT_ABOVE)
-        return true;
-      i += Character.charCount(ch);
-    }
-    
-    return false;
-  }
-  
-  /**
-   * delete a character in-place.
-   * rarely happens, only if COMBINING_DOT_ABOVE is found after an i
-   */
-  private int delete(char s[], int pos, int len) {
-    if (pos < len) 
-      System.arraycopy(s, pos + 1, s, pos, len - pos - 1);
-    
-    return len - 1;
-  }
-}