pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.4.0 / lucene / contrib / icu / src / java / org / apache / lucene / analysis / icu / ICUNormalizer2Filter.java

diff --git a/lucene-java-3.4.0/lucene/contrib/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2Filter.java b/lucene-java-3.4.0/lucene/contrib/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2Filter.java
deleted file mode 100644 (file)
index ef14f25..0000000
--- a/lucene-java-3.4.0/lucene/contrib/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2Filter.java
+++ /dev/null
@@ -1,91 +0,0 @@
-package org.apache.lucene.analysis.icu;
-
-/**
- * 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 com.ibm.icu.text.Normalizer;
-import com.ibm.icu.text.Normalizer2;
-
-/**
- * Normalize token text with ICU's {@link com.ibm.icu.text.Normalizer2}
- * <p>
- * With this filter, you can normalize text in the following ways:
- * <ul>
- *  <li> NFKC Normalization, Case Folding, and removing Ignorables (the default)
- *  <li> Using a standard Normalization mode (NFC, NFD, NFKC, NFKD)
- *  <li> Based on rules from a custom normalization mapping.
- * </ul>
- * <p>
- * If you use the defaults, this filter is a simple way to standardize Unicode text
- * in a language-independent way for search:
- * <ul>
- *  <li> The case folding that it does can be seen as a replacement for
- *  LowerCaseFilter: For example, it handles cases such as the Greek sigma, so that
- * "Μάϊος" and "ΜΆΪΟΣ" will match correctly.
- *  <li> The normalization will standardizes different forms of the same 
- *  character in Unicode. For example, CJK full-width numbers will be standardized
- *  to their ASCII forms.
- *  <li> Ignorables such as Zero-Width Joiner and Variation Selectors are removed.
- *  These are typically modifier characters that affect display.
- * </ul>
- * 
- * @see com.ibm.icu.text.Normalizer2
- * @see com.ibm.icu.text.FilteredNormalizer2
- */
-public class ICUNormalizer2Filter extends TokenFilter {
-  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
-  private final Normalizer2 normalizer;
-  private final StringBuilder buffer = new StringBuilder();
-
-  /**
-   * Create a new Normalizer2Filter that combines NFKC normalization, Case
-   * Folding, and removes Default Ignorables (NFKC_Casefold)
-   */
-  public ICUNormalizer2Filter(TokenStream input) {
-    this(input, Normalizer2.getInstance(null, "nfkc_cf", Normalizer2.Mode.COMPOSE));
-  }
-
-  /**
-   * Create a new Normalizer2Filter with the specified Normalizer2
-   * @param input stream
-   * @param normalizer normalizer to use
-   */
-  public ICUNormalizer2Filter(TokenStream input, Normalizer2 normalizer) {
-    super(input);
-    this.normalizer = normalizer;
-  }
-
-  @Override
-  public final boolean incrementToken() throws IOException {
-    if (input.incrementToken()) {
-      if (normalizer.quickCheck(termAtt) != Normalizer.YES) {
-        buffer.setLength(0);
-        normalizer.normalize(termAtt, buffer);
-        termAtt.setEmpty().append(buffer);
-      }
-      return true;
-    } else {
-      return false;
-    }
-  }
-}