X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/EdgeNGramTokenizer.java

diff --git a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/EdgeNGramTokenizer.java b/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/EdgeNGramTokenizer.java
deleted file mode 100644
index b11814b..0000000
--- a/lucene-java-3.4.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/ngram/EdgeNGramTokenizer.java
+++ /dev/null
@@ -1,229 +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 org.apache.lucene.analysis.Tokenizer;
-import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
-import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
-import org.apache.lucene.util.AttributeSource;
-
-import java.io.IOException;
-import java.io.Reader;
-
-/**
- * Tokenizes the input from an edge into n-grams of given size(s).
- * <p>
- * This {@link Tokenizer} create n-grams from the beginning edge or ending edge of a input token.
- * MaxGram can't be larger than 1024 because of limitation.
- * </p>
- */
-public final class EdgeNGramTokenizer extends Tokenizer {
-  public static final Side DEFAULT_SIDE = Side.FRONT;
-  public static final int DEFAULT_MAX_GRAM_SIZE = 1;
-  public static final int DEFAULT_MIN_GRAM_SIZE = 1;
-  
-  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
-  private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
-
-  /** Specifies which side of the input the n-gram should be generated from */
-  public static enum Side {
-
-    /** Get the n-gram from the front of the input */
-    FRONT {
-      @Override
-      public String getLabel() { return "front"; }
-    },
-
-    /** Get the n-gram from the end of the input */
-    BACK  {
-      @Override
-      public String getLabel() { return "back"; }
-    };
-
-    public abstract String getLabel();
-
-    // Get the appropriate Side from a string
-    public static Side getSide(String sideName) {
-      if (FRONT.getLabel().equals(sideName)) {
-        return FRONT;
-      }
-      if (BACK.getLabel().equals(sideName)) {
-        return BACK;
-      }
-      return null;
-    }
-  }
-
-  private int minGram;
-  private int maxGram;
-  private int gramSize;
-  private Side side;
-  private boolean started = false;
-  private int inLen;
-  private String inStr;
-
-
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   *
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param side the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(Reader input, Side side, int minGram, int maxGram) {
-    super(input);
-    init(side, minGram, maxGram);
-  }
-
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   *
-   * @param source {@link AttributeSource} to use
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param side the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(AttributeSource source, Reader input, Side side, int minGram, int maxGram) {
-    super(source, input);
-    init(side, minGram, maxGram);
-  }
-
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   * 
-   * @param factory {@link org.apache.lucene.util.AttributeSource.AttributeFactory} to use
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param side the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(AttributeFactory factory, Reader input, Side side, int minGram, int maxGram) {
-    super(factory, input);
-    init(side, minGram, maxGram);
-  }
-  
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   *
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param sideLabel the name of the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(Reader input, String sideLabel, int minGram, int maxGram) {
-    this(input, Side.getSide(sideLabel), minGram, maxGram);
-  }
-
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   *
-   * @param source {@link AttributeSource} to use
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param sideLabel the name of the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(AttributeSource source, Reader input, String sideLabel, int minGram, int maxGram) {
-    this(source, input, Side.getSide(sideLabel), minGram, maxGram);
-  }
-
-  /**
-   * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
-   * 
-   * @param factory {@link org.apache.lucene.util.AttributeSource.AttributeFactory} to use
-   * @param input {@link Reader} holding the input to be tokenized
-   * @param sideLabel the name of the {@link Side} from which to chop off an n-gram
-   * @param minGram the smallest n-gram to generate
-   * @param maxGram the largest n-gram to generate
-   */
-  public EdgeNGramTokenizer(AttributeFactory factory, Reader input, String sideLabel, int minGram, int maxGram) {
-    this(factory, input, Side.getSide(sideLabel), minGram, maxGram);
-  }
-  
-  private void init(Side side, int minGram, int maxGram) {
-    if (side == null) {
-      throw new IllegalArgumentException("sideLabel must be either front or back");
-    }
-
-    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;
-    this.side = side;
-  }
-
-  /** Returns the next token in the stream, or null at EOS. */
-  @Override
-  public final boolean incrementToken() throws IOException {
-    clearAttributes();
-    // if we are just starting, read the whole input
-    if (!started) {
-      started = true;
-      char[] chars = new char[1024];
-      int charsRead = input.read(chars);
-      inStr = new String(chars, 0, charsRead).trim();  // remove any leading or trailing spaces
-      inLen = inStr.length();
-      gramSize = minGram;
-    }
-
-    // if the remaining input is too short, we can't generate any n-grams
-    if (gramSize > inLen) {
-      return false;
-    }
-
-    // if we have hit the end of our n-gram size range, quit
-    if (gramSize > maxGram) {
-      return false;
-    }
-
-    // grab gramSize chars from front or back
-    int start = side == Side.FRONT ? 0 : inLen - gramSize;
-    int end = start + gramSize;
-    termAtt.setEmpty().append(inStr, start, end);
-    offsetAtt.setOffset(correctOffset(start), correctOffset(end));
-    gramSize++;
-    return true;
-  }
-  
-  @Override
-  public final void end() {
-    // set final offset
-    final int finalOffset = inLen;
-    this.offsetAtt.setOffset(finalOffset, finalOffset);
-  }    
-
-  @Override
-  public void reset(Reader input) throws IOException {
-    super.reset(input);
-    reset();
-  }
-
-  @Override
-  public void reset() throws IOException {
-    super.reset();
-    started = false;
-  }
-}