pylucene 3.5.0-3

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

diff --git a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/NGramTokenFilter.java b/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/NGramTokenFilter.java
deleted file mode 100644 (file)
index c73208b..0000000
--- a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/NGramTokenFilter.java
+++ /dev/null
@@ -1,106 +0,0 @@
-package org.apache.lucene.analysis.ngram;
-
-/**
- * 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.OffsetAttribute;
-import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
-
-/**
- * Tokenizes the input into n-grams of the given size(s).
- */
-public final class NGramTokenFilter extends TokenFilter {
-  public static final int DEFAULT_MIN_NGRAM_SIZE = 1;
-  public static final int DEFAULT_MAX_NGRAM_SIZE = 2;
-
-  private int minGram, maxGram;
-  
-  private char[] curTermBuffer;
-  private int curTermLength;
-  private int curGramSize;
-  private int curPos;
-  private int tokStart;
-  
-  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
-  private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
-
-  /**
-   * Creates NGramTokenFilter with given min and max n-grams.
-   * @param input {@link TokenStream} holding the input to be tokenized
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public NGramTokenFilter(TokenStream input, int minGram, int maxGram) {
-    super(input);
-    if (minGram < 1) {
-      throw new IllegalArgumentException("minGram must be greater than zero");
-    }
-    if (minGram > maxGram) {
-      throw new IllegalArgumentException("minGram must not be greater than maxGram");
-    }
-    this.minGram = minGram;
-    this.maxGram = maxGram;
-  }
-
-  /**
-   * Creates NGramTokenFilter with default min and max n-grams.
-   * @param input {@link TokenStream} holding the input to be tokenized
-   */
-  public NGramTokenFilter(TokenStream input) {
-    this(input, DEFAULT_MIN_NGRAM_SIZE, DEFAULT_MAX_NGRAM_SIZE);
-  }
-
-  /** Returns the next token in the stream, or null at EOS. */
-  @Override
-  public final boolean incrementToken() throws IOException {
-    while (true) {
-      if (curTermBuffer == null) {
-        if (!input.incrementToken()) {
-          return false;
-        } else {
-          curTermBuffer = termAtt.buffer().clone();
-          curTermLength = termAtt.length();
-          curGramSize = minGram;
-          curPos = 0;
-          tokStart = offsetAtt.startOffset();
-        }
-      }
-      while (curGramSize <= maxGram) {
-        while (curPos+curGramSize <= curTermLength) {     // while there is input
-          clearAttributes();
-          termAtt.copyBuffer(curTermBuffer, curPos, curGramSize);
-          offsetAtt.setOffset(tokStart + curPos, tokStart + curPos + curGramSize);
-          curPos++;
-          return true;
-        }
-        curGramSize++;                         // increase n-gram size
-        curPos = 0;
-      }
-      curTermBuffer = null;
-    }
-  }
-
-  @Override
-  public void reset() throws IOException {
-    super.reset();
-    curTermBuffer = null;
-  }
-}