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Import the new n-gram tokenizers and filters from Lucene. 

Lucene 4.4 will feature new n-gram tokenizers and filters that should not
generate broken offsets (that cause highlighting bugs) anymore. They also
correctly handle supplementary characters and the tokenizers can work in a
streaming fashion (they are not limited to the first 1024 chars of the
stream anymore).
This commit is contained in:
Adrien Grand 2013-06-13 23:28:06 +02:00
parent a388588b1f
commit fccbe9c185
14 changed files with 1619 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

214
src/main/java/org/apache/lucene/analysis/ngram/XEdgeNGramTokenFilter.java Normal file
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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.elasticsearch.common.lucene.Lucene;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.reverse.ReverseStringFilter;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionLengthAttribute;
import org.apache.lucene.analysis.util.XCharacterUtils;
import org.apache.lucene.util.Version;
import java.io.IOException;
/**
* Tokenizes the given token into n-grams of given size(s).
* <p>
* This {@link TokenFilter} create n-grams from the beginning edge or ending edge of a input token.
* <p><a name="version"/>As of Lucene 4.4, this filter does not support
* {@link Side#BACK} (you can use {@link ReverseStringFilter} up-front and
* afterward to get the same behavior), handles supplementary characters
* correctly and does not update offsets anymore.
*/
public final class XEdgeNGramTokenFilter extends TokenFilter {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
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;
/** 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 */
@Deprecated
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 final XCharacterUtils charUtils;
private final int minGram;
private final int maxGram;
private Side side;
private char[] curTermBuffer;
private int curTermLength;
private int curCodePointCount;
private int curGramSize;
private int tokStart;
private int tokEnd;
private int savePosIncr;
private int savePosLen;
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.class);
private final PositionLengthAttribute posLenAtt = addAttribute(PositionLengthAttribute.class);
/**
* Creates XEdgeNGramTokenFilter that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param input {@link TokenStream} 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
*/
@Deprecated
public XEdgeNGramTokenFilter(Version version, TokenStream input, Side side, int minGram, int maxGram) {
super(input);
if (version == null) {
throw new IllegalArgumentException("version must not be null");
}
if (side == Side.BACK) {
throw new IllegalArgumentException("Side.BACK is not supported anymore as of Lucene 4.4, use ReverseStringFilter up-front and afterward");
}
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.charUtils = XCharacterUtils.getInstance(version);
this.minGram = minGram;
this.maxGram = maxGram;
this.side = side;
}
/**
* Creates XEdgeNGramTokenFilter that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param input {@link TokenStream} 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
*/
@Deprecated
public XEdgeNGramTokenFilter(Version version, TokenStream input, String sideLabel, int minGram, int maxGram) {
this(version, input, Side.getSide(sideLabel), minGram, maxGram);
}
/**
* Creates XEdgeNGramTokenFilter that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @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 XEdgeNGramTokenFilter(Version version, TokenStream input, int minGram, int maxGram) {
this(version, input, Side.FRONT, minGram, maxGram);
}
@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();
curCodePointCount = charUtils.codePointCount(termAtt);
curGramSize = minGram;
tokStart = offsetAtt.startOffset();
tokEnd = offsetAtt.endOffset();
savePosIncr += posIncrAtt.getPositionIncrement();
savePosLen = posLenAtt.getPositionLength();
}
}
if (curGramSize <= maxGram) { // if we have hit the end of our n-gram size range, quit
if (curGramSize <= curCodePointCount) { // if the remaining input is too short, we can't generate any n-grams
// grab gramSize chars from front or back
final int start = side == Side.FRONT ? 0 : charUtils.offsetByCodePoints(curTermBuffer, 0, curTermLength, curTermLength, -curGramSize);
final int end = charUtils.offsetByCodePoints(curTermBuffer, 0, curTermLength, start, curGramSize);
clearAttributes();
offsetAtt.setOffset(tokStart, tokEnd);
// first ngram gets increment, others don't
if (curGramSize == minGram) {
posIncrAtt.setPositionIncrement(savePosIncr);
savePosIncr = 0;
} else {
posIncrAtt.setPositionIncrement(0);
}
posLenAtt.setPositionLength(savePosLen);
termAtt.copyBuffer(curTermBuffer, start, end - start);
curGramSize++;
return true;
}
}
curTermBuffer = null;
}
}
@Override
public void reset() throws IOException {
super.reset();
curTermBuffer = null;
savePosIncr = 0;
}
}

77
src/main/java/org/apache/lucene/analysis/ngram/XEdgeNGramTokenizer.java Normal file
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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.elasticsearch.common.lucene.Lucene;
import java.io.Reader;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.util.Version;
/**
* 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.
* <p><a name="version" /> As of Lucene 4.4, this tokenizer<ul>
* <li>can handle <code>maxGram</code> larger than 1024 chars, but beware that this will result in increased memory usage
* <li>doesn't trim the input,
* <li>sets position increments equal to 1 instead of 1 for the first token and 0 for all other ones
* <li>doesn't support backward n-grams anymore.
* <li>supports {@link #isTokenChar(int) pre-tokenization},
* <li>correctly handles supplementary characters.
* </ul>
* <p>Although <b style="color:red">highly</b> discouraged, it is still possible
* to use the old behavior through {@link Lucene43XEdgeXNGramTokenizer}.
*/
public class XEdgeNGramTokenizer extends XNGramTokenizer {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
public static final int DEFAULT_MAX_GRAM_SIZE = 1;
public static final int DEFAULT_MIN_GRAM_SIZE = 1;
/**
* Creates XEdgeXNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XEdgeNGramTokenizer(Version version, Reader input, int minGram, int maxGram) {
super(version, input, minGram, maxGram, true);
}
/**
* Creates XEdgeXNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param factory {@link org.apache.lucene.util.AttributeSource.AttributeFactory} to use
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XEdgeNGramTokenizer(Version version, AttributeFactory factory, Reader input, int minGram, int maxGram) {
super(version, factory, input, minGram, maxGram, true);
}
}

281
src/main/java/org/apache/lucene/analysis/ngram/XLucene43EdgeNGramTokenizer.java Normal file
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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.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import java.io.Reader;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.util.ArrayUtil;
import org.apache.lucene.util.Version;
/**
* Old version of {@link EdgeNGramTokenizer} which doesn't handle correctly
* supplementary characters.
*/
@Deprecated
public final class XLucene43EdgeNGramTokenizer extends Tokenizer {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
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);
private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.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;
private int inLen; // length of the input AFTER trim()
private int charsRead; // length of the input
private String inStr;
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @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
*/
@Deprecated
public XLucene43EdgeNGramTokenizer(Version version, Reader input, Side side, int minGram, int maxGram) {
super(input);
init(version, side, minGram, maxGram);
}
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @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
*/
@Deprecated
public XLucene43EdgeNGramTokenizer(Version version, AttributeFactory factory, Reader input, Side side, int minGram, int maxGram) {
super(factory, input);
init(version, side, minGram, maxGram);
}
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @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
*/
@Deprecated
public XLucene43EdgeNGramTokenizer(Version version, Reader input, String sideLabel, int minGram, int maxGram) {
this(version, input, Side.getSide(sideLabel), minGram, maxGram);
}
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @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
*/
@Deprecated
public XLucene43EdgeNGramTokenizer(Version version, AttributeFactory factory, Reader input, String sideLabel, int minGram, int maxGram) {
this(version, factory, input, Side.getSide(sideLabel), minGram, maxGram);
}
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XLucene43EdgeNGramTokenizer(Version version, Reader input, int minGram, int maxGram) {
this(version, input, Side.FRONT, minGram, maxGram);
}
/**
* Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
*
* @param version the <a href="#version">Lucene match version</a>
* @param factory {@link org.apache.lucene.util.AttributeSource.AttributeFactory} to use
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XLucene43EdgeNGramTokenizer(Version version, AttributeFactory factory, Reader input, int minGram, int maxGram) {
this(version, factory, input, Side.FRONT, minGram, maxGram);
}
private void init(Version version, Side side, int minGram, int maxGram) {
if (version == null) {
throw new IllegalArgumentException("version must not be null");
}
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");
}
maxGram = Math.min(maxGram, 1024);
this.minGram = minGram;
this.maxGram = maxGram;
this.side = side;
}
/** Returns the next token in the stream, or null at EOS. */
@Override
public boolean incrementToken() throws IOException {
clearAttributes();
// if we are just starting, read the whole input
if (!started) {
started = true;
gramSize = minGram;
final int limit = side == Side.FRONT ? maxGram : 1024;
char[] chars = new char[Math.min(1024, limit)];
charsRead = 0;
// TODO: refactor to a shared readFully somewhere:
boolean exhausted = false;
while (charsRead < limit) {
final int inc = input.read(chars, charsRead, chars.length-charsRead);
if (inc == -1) {
exhausted = true;
break;
}
charsRead += inc;
if (charsRead == chars.length && charsRead < limit) {
chars = ArrayUtil.grow(chars);
}
}
inStr = new String(chars, 0, charsRead);
inStr = inStr.trim();
if (!exhausted) {
// Read extra throwaway chars so that on end() we
// report the correct offset:
char[] throwaway = new char[1024];
while(true) {
final int inc = input.read(throwaway, 0, throwaway.length);
if (inc == -1) {
break;
}
charsRead += inc;
}
}
inLen = inStr.length();
if (inLen == 0) {
return false;
}
posIncrAtt.setPositionIncrement(1);
} else {
posIncrAtt.setPositionIncrement(0);
}
// 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 || gramSize > inLen) {
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 void end() {
// set final offset
final int finalOffset = correctOffset(charsRead);
this.offsetAtt.setOffset(finalOffset, finalOffset);
}
@Override
public void reset() throws IOException {
super.reset();
started = false;
}
}

164
src/main/java/org/apache/lucene/analysis/ngram/XLucene43NGramTokenizer.java Normal file
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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.util.Version;
import org.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import java.io.Reader;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
/**
* Old broken version of {@link NGramTokenizer}.
*/
@Deprecated
public final class XLucene43NGramTokenizer extends Tokenizer {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
public static final int DEFAULT_MIN_NGRAM_SIZE = 1;
public static final int DEFAULT_MAX_NGRAM_SIZE = 2;
private int minGram, maxGram;
private int gramSize;
private int pos;
private int inLen; // length of the input AFTER trim()
private int charsRead; // length of the input
private String inStr;
private boolean started;
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
/**
* Creates NGramTokenizer with given min and max n-grams.
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XLucene43NGramTokenizer(Reader input, int minGram, int maxGram) {
super(input);
init(minGram, maxGram);
}
/**
* Creates NGramTokenizer with given min and max n-grams.
* @param factory {@link org.apache.lucene.util.AttributeSource.AttributeFactory} to use
* @param input {@link Reader} holding the input to be tokenized
* @param minGram the smallest n-gram to generate
* @param maxGram the largest n-gram to generate
*/
public XLucene43NGramTokenizer(AttributeFactory factory, Reader input, int minGram, int maxGram) {
super(factory, input);
init(minGram, maxGram);
}
/**
* Creates NGramTokenizer with default min and max n-grams.
* @param input {@link Reader} holding the input to be tokenized
*/
public XLucene43NGramTokenizer(Reader input) {
this(input, DEFAULT_MIN_NGRAM_SIZE, DEFAULT_MAX_NGRAM_SIZE);
}
private void init(int minGram, int maxGram) {
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;
}
/** Returns the next token in the stream, or null at EOS. */
@Override
public boolean incrementToken() throws IOException {
clearAttributes();
if (!started) {
started = true;
gramSize = minGram;
char[] chars = new char[1024];
charsRead = 0;
// TODO: refactor to a shared readFully somewhere:
while (charsRead < chars.length) {
int inc = input.read(chars, charsRead, chars.length-charsRead);
if (inc == -1) {
break;
}
charsRead += inc;
}
inStr = new String(chars, 0, charsRead).trim(); // remove any trailing empty strings
if (charsRead == chars.length) {
// Read extra throwaway chars so that on end() we
// report the correct offset:
char[] throwaway = new char[1024];
while(true) {
final int inc = input.read(throwaway, 0, throwaway.length);
if (inc == -1) {
break;
}
charsRead += inc;
}
}
inLen = inStr.length();
if (inLen == 0) {
return false;
}
}
if (pos+gramSize > inLen) { // if we hit the end of the string
pos = 0; // reset to beginning of string
gramSize++; // increase n-gram size
if (gramSize > maxGram) // we are done
return false;
if (pos+gramSize > inLen)
return false;
}
int oldPos = pos;
pos++;
termAtt.setEmpty().append(inStr, oldPos, oldPos+gramSize);
offsetAtt.setOffset(correctOffset(oldPos), correctOffset(oldPos+gramSize));
return true;
}
@Override
public void end() {
// set final offset
final int finalOffset = correctOffset(charsRead);
this.offsetAtt.setOffset(finalOffset, finalOffset);
}
@Override
public void reset() throws IOException {
super.reset();
started = false;
pos = 0;
}
}

81
src/main/java/org/apache/lucene/analysis/ngram/XNGramTokenFilter.java
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@ -17,6 +17,8 @@ package org.apache.lucene.analysis.ngram;
* limitations under the License.
*/
import org.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import org.apache.lucene.analysis.TokenFilter;
@ -26,14 +28,15 @@ import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionLengthAttribute;
import org.apache.lucene.analysis.util.XCharacterUtils;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.lucene.Lucene;
/**
* Tokenizes the input into n-grams of the given size(s).
* <a name="version"/>
* <p>You must specify the required {@link Version} compatibility when
* creating a {@link NGramTokenFilter}. As of Lucene 4.4, this token filters:<ul>
* creating a {@link XNGramTokenFilter}. As of Lucene 4.4, this token filters:<ul>
* <li>handles supplementary characters correctly,</li>
* <li>emits all n-grams for the same token at the same position,</li>
* <li>does not modify offsets,</li>
* <li>sorts n-grams by their offset in the original token first, then
@ -43,13 +46,18 @@ import org.elasticsearch.common.lucene.Lucene;
* {@link Version#LUCENE_44} in the constructor but this is not recommended as
* it will lead to broken {@link TokenStream}s that will cause highlighting
* bugs.
* <p>If you were using this {@link TokenFilter} to perform partial highlighting,
* this won't work anymore since this filter doesn't update offsets. You should
* modify your analysis chain to use {@link NGramTokenizer}, and potentially
* override {@link NGramTokenizer#isTokenChar(int)} to perform pre-tokenization.
*/
public final class XNGramTokenFilter extends TokenFilter {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1476563
assert Lucene.VERSION.ordinal() < Version.LUCENE_42.ordinal()+2 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this should can be removed";
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
public static final int DEFAULT_MIN_NGRAM_SIZE = 1;
public static final int DEFAULT_MAX_NGRAM_SIZE = 2;
@ -57,21 +65,21 @@ public final class XNGramTokenFilter extends TokenFilter {
private char[] curTermBuffer;
private int curTermLength;
private int curCodePointCount;
private int curGramSize;
private int curPos;
private int curPosInc, curPosLen;
private int tokStart;
private int tokEnd;
private boolean hasIllegalOffsets; // only if the length changed before this filter
private final Version version;
private final XCharacterUtils charUtils;
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final PositionIncrementAttribute posIncAtt;
private final PositionLengthAttribute posLenAtt;
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
/**
* Creates NGramTokenFilter with given min and max n-grams.
* Creates XNGramTokenFilter with given min and max n-grams.
* @param version Lucene version to enable correct position increments.
* See <a href="#version">above</a> for details.
* @param input {@link TokenStream} holding the input to be tokenized
@ -80,7 +88,7 @@ public final class XNGramTokenFilter extends TokenFilter {
*/
public XNGramTokenFilter(Version version, TokenStream input, int minGram, int maxGram) {
super(new LengthFilter(true, input, minGram, Integer.MAX_VALUE));
this.version = version;
this.charUtils = XCharacterUtils.getInstance(version);
if (minGram < 1) {
throw new IllegalArgumentException("minGram must be greater than zero");
}
@ -89,31 +97,12 @@ public final class XNGramTokenFilter extends TokenFilter {
}
this.minGram = minGram;
this.maxGram = maxGram;
if (version.onOrAfter(Version.LUCENE_42)) {
posIncAtt = addAttribute(PositionIncrementAttribute.class);
posLenAtt = addAttribute(PositionLengthAttribute.class);
} else {
posIncAtt = new PositionIncrementAttribute() {
@Override
public void setPositionIncrement(int positionIncrement) {}
@Override
public int getPositionIncrement() {
return 0;
}
};
posLenAtt = new PositionLengthAttribute() {
@Override
public void setPositionLength(int positionLength) {}
@Override
public int getPositionLength() {
return 0;
}
};
}
posIncAtt = addAttribute(PositionIncrementAttribute.class);
posLenAtt = addAttribute(PositionLengthAttribute.class);
}
/**
* Creates NGramTokenFilter with default min and max n-grams.
* Creates XNGramTokenFilter with default min and max n-grams.
* @param version Lucene version to enable correct position increments.
* See <a href="#version">above</a> for details.
* @param input {@link TokenStream} holding the input to be tokenized
@ -132,25 +121,24 @@ public final class XNGramTokenFilter extends TokenFilter {
} else {
curTermBuffer = termAtt.buffer().clone();
curTermLength = termAtt.length();
curCodePointCount = charUtils.codePointCount(termAtt);
curGramSize = minGram;
curPos = 0;
curPosInc = posIncAtt.getPositionIncrement();
curPosLen = posLenAtt.getPositionLength();
tokStart = offsetAtt.startOffset();
tokEnd = offsetAtt.endOffset();
// if length by start + end offsets doesn't match the term text then assume
// this is a synonym and don't adjust the offsets.
hasIllegalOffsets = (tokStart + curTermLength) != tokEnd;
}
}
if (version.onOrAfter(Version.LUCENE_42)) {
if (curGramSize > maxGram || curPos + curGramSize > curTermLength) {
if (curGramSize > maxGram || (curPos + curGramSize) > curCodePointCount) {
++curPos;
curGramSize = minGram;
}
if (curPos + curGramSize <= curTermLength) {
if ((curPos + curGramSize) <= curCodePointCount) {
clearAttributes();
termAtt.copyBuffer(curTermBuffer, curPos, curGramSize);
final int start = charUtils.offsetByCodePoints(curTermBuffer, 0, curTermLength, 0, curPos);
final int end = charUtils.offsetByCodePoints(curTermBuffer, 0, curTermLength, start, curGramSize);
termAtt.copyBuffer(curTermBuffer, start, end - start);
posIncAtt.setPositionIncrement(curPosInc);
curPosInc = 0;
posLenAtt.setPositionLength(curPosLen);
@ -158,23 +146,6 @@ public final class XNGramTokenFilter extends TokenFilter {
curGramSize++;
return true;
}
} else {
while (curGramSize <= maxGram) {
while (curPos+curGramSize <= curTermLength) { // while there is input
clearAttributes();
termAtt.copyBuffer(curTermBuffer, curPos, curGramSize);
if (hasIllegalOffsets) {
offsetAtt.setOffset(tokStart, tokEnd);
} else {
offsetAtt.setOffset(tokStart + curPos, tokStart + curPos + curGramSize);
}
curPos++;
return true;
}
curGramSize++; // increase n-gram size
curPos = 0;
}
}
curTermBuffer = null;
}
}

186
src/main/java/org/apache/lucene/analysis/ngram/XNGramTokenizer.java
View File

@ -17,6 +17,8 @@ package org.apache.lucene.analysis.ngram;
* limitations under the License.
*/
import org.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import java.io.Reader;
@ -25,8 +27,8 @@ import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionLengthAttribute;
import org.apache.lucene.analysis.util.XCharacterUtils;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.lucene.Lucene;
/**
* Tokenizes the input into n-grams of the given size(s).
@ -41,34 +43,53 @@ import org.elasticsearch.common.lucene.Lucene;
* <tr><th>Offsets</th><td>[0,2[</td><td>[0,3[</td><td>[1,3[</td><td>[1,4[</td><td>[2,4[</td><td>[2,5[</td><td>[3,5[</td></tr>
* </table>
* <a name="version"/>
* <p>Before Lucene 4.4, this class had a different behavior:<ul>
* <li>It didn't support more than 1024 chars of input, the rest was trashed.</li>
* <li>The last whitespaces of the 1024 chars block were trimmed.</li>
* <li>Tokens were emitted in a different order (by increasing lengths).</li></ul>
* <p>Although highly discouraged, it is still possible to use the old behavior
* through {@link Lucene43NGramTokenizer}.
* <p>This tokenizer changed a lot in Lucene 4.4 in order to:<ul>
* <li>tokenize in a streaming fashion to support streams which are larger
* than 1024 chars (limit of the previous version),
* <li>count grams based on unicode code points instead of java chars (and
* never split in the middle of surrogate pairs),
* <li>give the ability to {@link #isTokenChar(int) pre-tokenize} the stream
* before computing n-grams.</ul>
* <p>Additionally, this class doesn't trim trailing whitespaces and emits
* tokens in a different order, tokens are now emitted by increasing start
* offsets while they used to be emitted by increasing lengths (which prevented
* from supporting large input streams).
* <p>Although <b style="color:red">highly</b> discouraged, it is still possible
* to use the old behavior through {@link Lucene43NGramTokenizer}.
*/
public final class XNGramTokenizer extends Tokenizer {
// non-final to allow for overriding isTokenChar, but all other methods should be final
public class XNGramTokenizer extends Tokenizer {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
public static final int DEFAULT_MIN_NGRAM_SIZE = 1;
public static final int DEFAULT_MAX_NGRAM_SIZE = 2;
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1476563
assert Lucene.VERSION.ordinal() < Version.LUCENE_42.ordinal()+2 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this should can be removed";
}
private char[] buffer;
private int bufferStart, bufferEnd; // remaining slice of the buffer
private XCharacterUtils charUtils;
private XCharacterUtils.CharacterBuffer charBuffer;
private int[] buffer; // like charBuffer, but converted to code points
private int bufferStart, bufferEnd; // remaining slice in buffer
private int offset;
private int gramSize;
private int minGram, maxGram;
private boolean exhausted;
private int lastCheckedChar; // last offset in the buffer that we checked
private int lastNonTokenChar; // last offset that we found to not be a token char
private boolean edgesOnly; // leading edges n-grams only
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final PositionIncrementAttribute posIncAtt = addAttribute(PositionIncrementAttribute.class);
private final PositionLengthAttribute posLenAtt = addAttribute(PositionLengthAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
XNGramTokenizer(Version version, Reader input, int minGram, int maxGram, boolean edgesOnly) {
super(input);
init(version, minGram, maxGram, edgesOnly);
}
/**
* Creates NGramTokenizer with given min and max n-grams.
* @param version the lucene compatibility <a href="#version">version</a>
@ -77,8 +98,12 @@ public final class XNGramTokenizer extends Tokenizer {
* @param maxGram the largest n-gram to generate
*/
public XNGramTokenizer(Version version, Reader input, int minGram, int maxGram) {
super(input);
init(version, minGram, maxGram);
this(version, input, minGram, maxGram, false);
}
XNGramTokenizer(Version version, AttributeFactory factory, Reader input, int minGram, int maxGram, boolean edgesOnly) {
super(factory, input);
init(version, minGram, maxGram, edgesOnly);
}
/**
@ -90,8 +115,7 @@ public final class XNGramTokenizer extends Tokenizer {
* @param maxGram the largest n-gram to generate
*/
public XNGramTokenizer(Version version, AttributeFactory factory, Reader input, int minGram, int maxGram) {
super(factory, input);
init(version, minGram, maxGram);
this(version, factory, input, minGram, maxGram, false);
}
/**
@ -103,10 +127,13 @@ public final class XNGramTokenizer extends Tokenizer {
this(version, input, DEFAULT_MIN_NGRAM_SIZE, DEFAULT_MAX_NGRAM_SIZE);
}
private void init(Version version, int minGram, int maxGram) {
if (!version.onOrAfter(Version.LUCENE_42)) {
throw new IllegalArgumentException("This class only works with Lucene 4.4+. To emulate the old (broken) behavior of NGramTokenizer, use Lucene43NGramTokenizer");
private void init(Version version, int minGram, int maxGram, boolean edgesOnly) {
if (!version.onOrAfter(Version.LUCENE_43)) {
throw new IllegalArgumentException("This class only works with Lucene 4.4+. To emulate the old (broken) behavior of NGramTokenizer, use Lucene43NGramTokenizer/Lucene43EdgeNGramTokenizer");
}
charUtils = version.onOrAfter(Version.LUCENE_43)
? XCharacterUtils.getInstance(version)
: XCharacterUtils.getJava4Instance();
if (minGram < 1) {
throw new IllegalArgumentException("minGram must be greater than zero");
}
@ -115,66 +142,107 @@ public final class XNGramTokenizer extends Tokenizer {
}
this.minGram = minGram;
this.maxGram = maxGram;
buffer = new char[maxGram + 1024];
this.edgesOnly = edgesOnly;
charBuffer = XCharacterUtils.newCharacterBuffer(2 * maxGram + 1024); // 2 * maxGram in case all code points require 2 chars and + 1024 for buffering to not keep polling the Reader
buffer = new int[charBuffer.getBuffer().length];
// Make the term att large enough
termAtt.resizeBuffer(2 * maxGram);
}
/** Returns the next token in the stream, or null at EOS. */
@Override
public boolean incrementToken() throws IOException {
public final boolean incrementToken() throws IOException {
clearAttributes();
// compact
if (bufferStart >= buffer.length - maxGram) {
System.arraycopy(buffer, bufferStart, buffer, 0, bufferEnd - bufferStart);
bufferEnd -= bufferStart;
bufferStart = 0;
// termination of this loop is guaranteed by the fact that every iteration
// either advances the buffer (calls consumes()) or increases gramSize
while (true) {
// compact
if (bufferStart >= bufferEnd - maxGram - 1 && !exhausted) {
System.arraycopy(buffer, bufferStart, buffer, 0, bufferEnd - bufferStart);
bufferEnd -= bufferStart;
lastCheckedChar -= bufferStart;
lastNonTokenChar -= bufferStart;
bufferStart = 0;
// fill in remaining space
if (!exhausted) {
// TODO: refactor to a shared readFully
while (bufferEnd < buffer.length) {
final int read = input.read(buffer, bufferEnd, buffer.length - bufferEnd);
if (read == -1) {
exhausted = true;
break;
}
bufferEnd += read;
// fill in remaining space
exhausted = !charUtils.fill(charBuffer, input, buffer.length - bufferEnd);
// convert to code points
bufferEnd += charUtils.toCodePoints(charBuffer.getBuffer(), 0, charBuffer.getLength(), buffer, bufferEnd);
}
// should we go to the next offset?
if (gramSize > maxGram || (bufferStart + gramSize) > bufferEnd) {
if (bufferStart + 1 + minGram > bufferEnd) {
assert exhausted;
return false;
}
consume();
gramSize = minGram;
}
updateLastNonTokenChar();
// retry if the token to be emitted was going to not only contain token chars
final boolean termContainsNonTokenChar = lastNonTokenChar >= bufferStart && lastNonTokenChar < (bufferStart + gramSize);
final boolean isEdgeAndPreviousCharIsTokenChar = edgesOnly && lastNonTokenChar != bufferStart - 1;
if (termContainsNonTokenChar || isEdgeAndPreviousCharIsTokenChar) {
consume();
gramSize = minGram;
continue;
}
final int length = charUtils.toChars(buffer, bufferStart, gramSize, termAtt.buffer(), 0);
termAtt.setLength(length);
posIncAtt.setPositionIncrement(1);
posLenAtt.setPositionLength(1);
offsetAtt.setOffset(correctOffset(offset), correctOffset(offset + length));
++gramSize;
return true;
}
}
private void updateLastNonTokenChar() {
final int termEnd = bufferStart + gramSize - 1;
if (termEnd > lastCheckedChar) {
for (int i = termEnd; i > lastCheckedChar; --i) {
if (!isTokenChar(buffer[i])) {
lastNonTokenChar = i;
break;
}
}
lastCheckedChar = termEnd;
}
}
// should we go to the next offset?
if (gramSize > maxGram || bufferStart + gramSize > bufferEnd) {
bufferStart++;
offset++;
gramSize = minGram;
}
/** Consume one code point. */
private void consume() {
offset += Character.charCount(buffer[bufferStart++]);
}
// are there enough chars remaining?
if (bufferStart + gramSize > bufferEnd) {
return false;
}
termAtt.copyBuffer(buffer, bufferStart, gramSize);
posIncAtt.setPositionIncrement(1);
posLenAtt.setPositionLength(1);
offsetAtt.setOffset(correctOffset(offset), correctOffset(offset + gramSize));
++gramSize;
/** Only collect characters which satisfy this condition. */
protected boolean isTokenChar(int chr) {
return true;
}
@Override
public void end() {
final int endOffset = correctOffset(offset + bufferEnd - bufferStart);
public final void end() {
assert bufferStart <= bufferEnd;
int endOffset = offset;
for (int i = bufferStart; i < bufferEnd; ++i) {
endOffset += Character.charCount(buffer[i]);
}
endOffset = correctOffset(endOffset);
offsetAtt.setOffset(endOffset, endOffset);
}
@Override
public void reset() throws IOException {
public final void reset() throws IOException {
super.reset();
bufferStart = bufferEnd = buffer.length;
lastNonTokenChar = lastCheckedChar = bufferStart - 1;
offset = 0;
gramSize = minGram;
exhausted = false;
charBuffer.reset();
}
}

394
src/main/java/org/apache/lucene/analysis/util/XCharacterUtils.java Normal file
View File

@ -0,0 +1,394 @@
package org.apache.lucene.analysis.util;
/*
* 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.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import java.io.Reader;
import org.apache.lucene.util.Version;
/**
* {@link XCharacterUtils} provides a unified interface to Character-related
* operations to implement backwards compatible character operations based on a
* {@link Version} instance.
*
* @lucene.internal
*/
public abstract class XCharacterUtils {
static {
// LUCENE MONITOR: this should be in Lucene 4.4 copied from Revision: 1492640.
assert Lucene.VERSION == Version.LUCENE_43 : "Elasticsearch has upgraded to Lucene Version: [" + Lucene.VERSION + "] this class should be removed";
}
private static final Java4XCharacterUtils JAVA_4 = new Java4XCharacterUtils();
private static final Java5XCharacterUtils JAVA_5 = new Java5XCharacterUtils();
/**
* Returns a {@link XCharacterUtils} implementation according to the given
* {@link Version} instance.
*
* @param matchVersion
* a version instance
* @return a {@link XCharacterUtils} implementation according to the given
* {@link Version} instance.
*/
public static XCharacterUtils getInstance(final Version matchVersion) {
return matchVersion.onOrAfter(Version.LUCENE_31) ? JAVA_5 : JAVA_4;
}
/** Return a {@link XCharacterUtils} instance compatible with Java 1.4. */
public static XCharacterUtils getJava4Instance() {
return JAVA_4;
}
/**
* Returns the code point at the given index of the {@link CharSequence}.
* Depending on the {@link Version} passed to
* {@link XCharacterUtils#getInstance(Version)} this method mimics the behavior
* of {@link Character#codePointAt(char[], int)} as it would have been
* available on a Java 1.4 JVM or on a later virtual machine version.
*
* @param seq
* a character sequence
* @param offset
* the offset to the char values in the chars array to be converted
*
* @return the Unicode code point at the given index
* @throws NullPointerException
* - if the sequence is null.
* @throws IndexOutOfBoundsException
* - if the value offset is negative or not less than the length of
* the character sequence.
*/
public abstract int codePointAt(final CharSequence seq, final int offset);
/**
* Returns the code point at the given index of the char array where only elements
* with index less than the limit are used.
* Depending on the {@link Version} passed to
* {@link XCharacterUtils#getInstance(Version)} this method mimics the behavior
* of {@link Character#codePointAt(char[], int)} as it would have been
* available on a Java 1.4 JVM or on a later virtual machine version.
*
* @param chars
* a character array
* @param offset
* the offset to the char values in the chars array to be converted
* @param limit the index afer the last element that should be used to calculate
* codepoint.
*
* @return the Unicode code point at the given index
* @throws NullPointerException
* - if the array is null.
* @throws IndexOutOfBoundsException
* - if the value offset is negative or not less than the length of
* the char array.
*/
public abstract int codePointAt(final char[] chars, final int offset, final int limit);
/** Return the number of characters in <code>seq</code>. */
public abstract int codePointCount(CharSequence seq);
/**
* Creates a new {@link CharacterBuffer} and allocates a <code>char[]</code>
* of the given bufferSize.
*
* @param bufferSize
* the internal char buffer size, must be <code>&gt;= 2</code>
* @return a new {@link CharacterBuffer} instance.
*/
public static CharacterBuffer newCharacterBuffer(final int bufferSize) {
if (bufferSize < 2) {
throw new IllegalArgumentException("buffersize must be >= 2");
}
return new CharacterBuffer(new char[bufferSize], 0, 0);
}
/**
* Converts each unicode codepoint to lowerCase via {@link Character#toLowerCase(int)} starting
* at the given offset.
* @param buffer the char buffer to lowercase
* @param offset the offset to start at
* @param limit the max char in the buffer to lower case
*/
public final void toLowerCase(final char[] buffer, final int offset, final int limit) {
assert buffer.length >= limit;
assert offset <=0 && offset <= buffer.length;
for (int i = offset; i < limit;) {
i += Character.toChars(
Character.toLowerCase(
codePointAt(buffer, i, limit)), buffer, i);
}
}
/** Converts a sequence of Java characters to a sequence of unicode code points.
* @return the number of code points written to the destination buffer */
public final int toCodePoints(char[] src, int srcOff, int srcLen, int[] dest, int destOff) {
if (srcLen < 0) {
throw new IllegalArgumentException("srcLen must be >= 0");
}
int codePointCount = 0;
for (int i = 0; i < srcLen; ) {
final int cp = codePointAt(src, srcOff + i, srcOff + srcLen);
final int charCount = Character.charCount(cp);
dest[destOff + codePointCount++] = cp;
i += charCount;
}
return codePointCount;
}
/** Converts a sequence of unicode code points to a sequence of Java characters.
* @return the number of chars written to the destination buffer */
public final int toChars(int[] src, int srcOff, int srcLen, char[] dest, int destOff) {
if (srcLen < 0) {
throw new IllegalArgumentException("srcLen must be >= 0");
}
int written = 0;
for (int i = 0; i < srcLen; ++i) {
written += Character.toChars(src[srcOff + i], dest, destOff + written);
}
return written;
}
/**
* Fills the {@link CharacterBuffer} with characters read from the given
* reader {@link Reader}. This method tries to read <code>numChars</code>
* characters into the {@link CharacterBuffer}, each call to fill will start
* filling the buffer from offset <code>0</code> up to <code>numChars</code>.
* In case code points can span across 2 java characters, this method may
* only fill <code>numChars - 1</code> characters in order not to split in
* the middle of a surrogate pair, even if there are remaining characters in
* the {@link Reader}.
* <p>
* Depending on the {@link Version} passed to
* {@link XCharacterUtils#getInstance(Version)} this method implements
* supplementary character awareness when filling the given buffer. For all
* {@link Version} &gt; 3.0 {@link #fill(CharacterBuffer, Reader, int)} guarantees
* that the given {@link CharacterBuffer} will never contain a high surrogate
* character as the last element in the buffer unless it is the last available
* character in the reader. In other words, high and low surrogate pairs will
* always be preserved across buffer boarders.
* </p>
* <p>
* A return value of <code>false</code> means that this method call exhausted
* the reader, but there may be some bytes which have been read, which can be
* verified by checking whether <code>buffer.getLength() &gt; 0</code>.
* </p>
*
* @param buffer
* the buffer to fill.
* @param reader
* the reader to read characters from.
* @param numChars
* the number of chars to read
* @return <code>false</code> if and only if reader.read returned -1 while trying to fill the buffer
* @throws IOException
* if the reader throws an {@link IOException}.
*/
public abstract boolean fill(CharacterBuffer buffer, Reader reader, int numChars) throws IOException;
/** Convenience method which calls <code>fill(buffer, reader, buffer.buffer.length)</code>. */
public final boolean fill(CharacterBuffer buffer, Reader reader) throws IOException {
return fill(buffer, reader, buffer.buffer.length);
}
/** Return the index within <code>buf[start:start+count]</code> which is by <code>offset</code>
* code points from <code>index</code>. */
public abstract int offsetByCodePoints(char[] buf, int start, int count, int index, int offset);
static int readFully(Reader reader, char[] dest, int offset, int len) throws IOException {
int read = 0;
while (read < len) {
final int r = reader.read(dest, offset + read, len - read);
if (r == -1) {
break;
}
read += r;
}
return read;
}
private static final class Java5XCharacterUtils extends XCharacterUtils {
Java5XCharacterUtils() {
}
@Override
public int codePointAt(final CharSequence seq, final int offset) {
return Character.codePointAt(seq, offset);
}
@Override
public int codePointAt(final char[] chars, final int offset, final int limit) {
return Character.codePointAt(chars, offset, limit);
}
@Override
public boolean fill(final CharacterBuffer buffer, final Reader reader, int numChars) throws IOException {
assert buffer.buffer.length >= 2;
if (numChars < 2 || numChars > buffer.buffer.length) {
throw new IllegalArgumentException("numChars must be >= 2 and <= the buffer size");
}
final char[] charBuffer = buffer.buffer;
buffer.offset = 0;
final int offset;
// Install the previously saved ending high surrogate:
if (buffer.lastTrailingHighSurrogate != 0) {
charBuffer[0] = buffer.lastTrailingHighSurrogate;
buffer.lastTrailingHighSurrogate = 0;
offset = 1;
} else {
offset = 0;
}
final int read = readFully(reader, charBuffer, offset, numChars - offset);
buffer.length = offset + read;
final boolean result = buffer.length == numChars;
if (buffer.length < numChars) {
// We failed to fill the buffer. Even if the last char is a high
// surrogate, there is nothing we can do
return result;
}
if (Character.isHighSurrogate(charBuffer[buffer.length - 1])) {
buffer.lastTrailingHighSurrogate = charBuffer[--buffer.length];
}
return result;
}
@Override
public int codePointCount(CharSequence seq) {
return Character.codePointCount(seq, 0, seq.length());
}
@Override
public int offsetByCodePoints(char[] buf, int start, int count, int index, int offset) {
return Character.offsetByCodePoints(buf, start, count, index, offset);
}
}
private static final class Java4XCharacterUtils extends XCharacterUtils {
Java4XCharacterUtils() {
}
@Override
public int codePointAt(final CharSequence seq, final int offset) {
return seq.charAt(offset);
}
@Override
public int codePointAt(final char[] chars, final int offset, final int limit) {
if(offset >= limit)
throw new IndexOutOfBoundsException("offset must be less than limit");
return chars[offset];
}
@Override
public boolean fill(CharacterBuffer buffer, Reader reader, int numChars)
throws IOException {
assert buffer.buffer.length >= 1;
if (numChars < 1 || numChars > buffer.buffer.length) {
throw new IllegalArgumentException("numChars must be >= 1 and <= the buffer size");
}
buffer.offset = 0;
final int read = readFully(reader, buffer.buffer, 0, numChars);
buffer.length = read;
buffer.lastTrailingHighSurrogate = 0;
return read == numChars;
}
@Override
public int codePointCount(CharSequence seq) {
return seq.length();
}
@Override
public int offsetByCodePoints(char[] buf, int start, int count, int index, int offset) {
final int result = index + offset;
if (result < 0 || result > count) {
throw new IndexOutOfBoundsException();
}
return result;
}
}
/**
* A simple IO buffer to use with
* {@link XCharacterUtils#fill(CharacterBuffer, Reader)}.
*/
public static final class CharacterBuffer {
private final char[] buffer;
private int offset;
private int length;
// NOTE: not private so outer class can access without
// $access methods:
char lastTrailingHighSurrogate;
CharacterBuffer(char[] buffer, int offset, int length) {
this.buffer = buffer;
this.offset = offset;
this.length = length;
}
/**
* Returns the internal buffer
*
* @return the buffer
*/
public char[] getBuffer() {
return buffer;
}
/**
* Returns the data offset in the internal buffer.
*
* @return the offset
*/
public int getOffset() {
return offset;
}
/**
* Return the length of the data in the internal buffer starting at
* {@link #getOffset()}
*
* @return the length
*/
public int getLength() {
return length;
}
/**
* Resets the CharacterBuffer. All internals are reset to its default
* values.
*/
public void reset() {
offset = 0;
length = 0;
lastTrailingHighSurrogate = 0;
}
}
}

137
src/main/java/org/elasticsearch/index/analysis/CharMatcher.java Normal file
View File

@ -0,0 +1,137 @@
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.
*/
package org.elasticsearch.index.analysis;
import java.util.HashSet;
import java.util.Set;
/**
* A class to match character code points.
*/
public interface CharMatcher {
public static class ByUnicodeCategory implements CharMatcher {
public static CharMatcher of(byte unicodeCategory) {
return new ByUnicodeCategory(unicodeCategory);
}
private final byte unicodeType;
ByUnicodeCategory(byte unicodeType) {
this.unicodeType = unicodeType;
}
@Override
public boolean isTokenChar(int c) {
return Character.getType(c) == unicodeType;
}
}
public enum Basic implements CharMatcher {
LETTER {
@Override
public boolean isTokenChar(int c) {
return Character.isLetter(c);
}
},
DIGIT {
@Override
public boolean isTokenChar(int c) {
return Character.isDigit(c);
}
},
WHITESPACE {
@Override
public boolean isTokenChar(int c) {
return Character.isWhitespace(c);
}
},
PUNCTUATION {
@Override
public boolean isTokenChar(int c) {
switch (Character.getType(c)) {
case Character.START_PUNCTUATION:
case Character.END_PUNCTUATION:
case Character.OTHER_PUNCTUATION:
case Character.CONNECTOR_PUNCTUATION:
case Character.DASH_PUNCTUATION:
case Character.INITIAL_QUOTE_PUNCTUATION:
case Character.FINAL_QUOTE_PUNCTUATION:
return true;
default:
return false;
}
}
},
SYMBOL {
@Override
public boolean isTokenChar(int c) {
switch (Character.getType(c)) {
case Character.CURRENCY_SYMBOL:
case Character.MATH_SYMBOL:
case Character.OTHER_SYMBOL:
return true;
default:
return false;
}
}
}
}
public final class Builder {
private final Set<CharMatcher> matchers;
Builder() {
matchers = new HashSet<CharMatcher>();
}
public Builder or(CharMatcher matcher) {
matchers.add(matcher);
return this;
}
public CharMatcher build() {
switch (matchers.size()) {
case 0:
return new CharMatcher() {
@Override
public boolean isTokenChar(int c) {
return false;
}
};
case 1:
return matchers.iterator().next();
default:
return new CharMatcher() {
@Override
public boolean isTokenChar(int c) {
for (CharMatcher matcher : matchers) {
if (matcher.isTokenChar(c)) {
return true;
}
}
return false;
}
};
}
}
}
/** Returns true if, and only if, the provided character matches this character class. */
public boolean isTokenChar(int c);
}

22
src/main/java/org/elasticsearch/index/analysis/EdgeNGramTokenFilterFactory.java
View File

@ -20,9 +20,10 @@
package org.elasticsearch.index.analysis;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenFilter;
import org.apache.lucene.analysis.ngram.*;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter.Side;
import org.apache.lucene.analysis.reverse.ReverseStringFilter;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
@ -51,6 +52,19 @@ public class EdgeNGramTokenFilterFactory extends AbstractTokenFilterFactory {
@Override
public TokenStream create(TokenStream tokenStream) {
return new EdgeNGramTokenFilter(tokenStream, side, minGram, maxGram);
if (version.onOrAfter(Version.LUCENE_43)) {
TokenStream result = tokenStream;
// side=BACK is not supported anymore but applying ReverseStringFilter up-front and after the token filter has the same effect
if (side == Side.BACK) {
result = new ReverseStringFilter(version, result);
}
result = new XEdgeNGramTokenFilter(version, result, minGram, maxGram);
if (side == Side.BACK) {
result = new ReverseStringFilter(version, result);
}
return result;
} else {
return new EdgeNGramTokenFilter(tokenStream, side, minGram, maxGram);
}
}
}

29
src/main/java/org/elasticsearch/index/analysis/EdgeNGramTokenizerFactory.java
View File

@ -19,9 +19,13 @@
package org.elasticsearch.index.analysis;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
import org.apache.lucene.analysis.ngram.XEdgeNGramTokenizer;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
@ -30,6 +34,8 @@ import org.elasticsearch.index.settings.IndexSettings;
import java.io.Reader;
import static org.elasticsearch.index.analysis.NGramTokenizerFactory.parseTokenChars;
/**
*
*/
@ -41,16 +47,37 @@ public class EdgeNGramTokenizerFactory extends AbstractTokenizerFactory {
private final EdgeNGramTokenizer.Side side;
private final CharMatcher matcher;
@Inject
public EdgeNGramTokenizerFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name, settings);
this.minGram = settings.getAsInt("min_gram", NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE);
this.maxGram = settings.getAsInt("max_gram", NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE);
this.side = EdgeNGramTokenizer.Side.getSide(settings.get("side", EdgeNGramTokenizer.DEFAULT_SIDE.getLabel()));
this.matcher = parseTokenChars(settings.getAsArray("token_chars"));
}
@Override
public Tokenizer create(Reader reader) {
return new EdgeNGramTokenizer(reader, side, minGram, maxGram);
if (version.onOrAfter(Version.LUCENE_43)) {
if (side == EdgeNGramTokenizer.Side.BACK) {
throw new ElasticSearchIllegalArgumentException("side=BACK is not supported anymore. Please fix your analysis chain or use"
+ " an older compatibility version (<=4.2) but beware that it might cause highlighting bugs.");
}
// LUCENE MONITOR: this token filter is a copy from lucene trunk and should go away once we upgrade to lucene 4.4
if (matcher == null) {
return new XEdgeNGramTokenizer(version, reader, minGram, maxGram);
} else {
return new XEdgeNGramTokenizer(version, reader, minGram, maxGram) {
@Override
protected boolean isTokenChar(int chr) {
return matcher.isTokenChar(chr);
}
};
}
} else {
return new EdgeNGramTokenizer(reader, side, minGram, maxGram);
}
}
}

2
src/main/java/org/elasticsearch/index/analysis/NGramTokenFilterFactory.java
View File

@ -49,7 +49,7 @@ public class NGramTokenFilterFactory extends AbstractTokenFilterFactory {
@Override
public TokenStream create(TokenStream tokenStream) {
if (this.version.onOrAfter(Version.LUCENE_42)) {
if (this.version.onOrAfter(Version.LUCENE_43)) {
// LUCENE MONITOR: this token filter is a copy from lucene trunk and should go away once we upgrade to lucene 4.4
return new XNGramTokenFilter(version, tokenStream, minGram, maxGram);
}

67
src/main/java/org/elasticsearch/index/analysis/NGramTokenizerFactory.java
View File

@ -19,10 +19,12 @@
package org.elasticsearch.index.analysis;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
import org.apache.lucene.analysis.ngram.XNGramTokenizer;
import org.apache.lucene.util.Version;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
@ -30,6 +32,10 @@ import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettings;
import java.io.Reader;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Locale;
import java.util.Map;
/**
*
@ -37,22 +43,75 @@ import java.io.Reader;
public class NGramTokenizerFactory extends AbstractTokenizerFactory {
private final int minGram;
private final int maxGram;
private final CharMatcher matcher;
static final Map<String, CharMatcher> MATCHERS;
static {
ImmutableMap.Builder<String, CharMatcher> builder = ImmutableMap.builder();
builder.put("letter", CharMatcher.Basic.LETTER);
builder.put("digit", CharMatcher.Basic.DIGIT);
builder.put("whitespace", CharMatcher.Basic.WHITESPACE);
builder.put("punctuation", CharMatcher.Basic.PUNCTUATION);
builder.put("symbol", CharMatcher.Basic.SYMBOL);
// Populate with unicode categories from java.lang.Character
for (Field field : Character.class.getFields()) {
if (!field.getName().startsWith("DIRECTIONALITY")
&& Modifier.isPublic(field.getModifiers())
&& Modifier.isStatic(field.getModifiers())
&& field.getType() == byte.class) {
try {
builder.put(field.getName().toLowerCase(Locale.ROOT), CharMatcher.ByUnicodeCategory.of(field.getByte(null)));
} catch (Exception e) {
// just ignore
continue;
}
}
}
MATCHERS = builder.build();
}
static CharMatcher parseTokenChars(String[] characterClasses) {
if (characterClasses == null || characterClasses.length == 0) {
return null;
}
CharMatcher.Builder builder = new CharMatcher.Builder();
for (String characterClass : characterClasses) {
characterClass = characterClass.toLowerCase(Locale.ROOT).trim();
CharMatcher matcher = MATCHERS.get(characterClass);
if (matcher == null) {
throw new ElasticSearchIllegalArgumentException("Unknown token type: '" + characterClass + "', must be one of " + MATCHERS.keySet());
}
builder.or(matcher);
}
return builder.build();
}
@Inject
public NGramTokenizerFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name, settings);
this.minGram = settings.getAsInt("min_gram", NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE);
this.maxGram = settings.getAsInt("max_gram", NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE);
this.matcher = parseTokenChars(settings.getAsArray("token_chars"));
}
@Override
public Tokenizer create(Reader reader) {
if (this.version.onOrAfter(Version.LUCENE_42)) {
// LUCENE MONITOR: this token filter is a copy from lucene trunk and should go away once we upgrade to lucene 4.4
return new XNGramTokenizer(version, reader, minGram, maxGram);
if (this.version.onOrAfter(Version.LUCENE_43)) {
// LUCENE MONITOR: this token filter is a copy from lucene trunk and should go away once we upgrade to lucene 4.4
if (matcher == null) {
return new XNGramTokenizer(version, reader, minGram, maxGram);
} else {
return new XNGramTokenizer(version, reader, minGram, maxGram) {
@Override
protected boolean isTokenChar(int chr) {
return matcher.isTokenChar(chr);
}
};
}
}
return new NGramTokenizer(reader, minGram, maxGram);
}
}

2
src/test/java/org/elasticsearch/test/integration/search/highlight/HighlighterSearchTests.java
View File

@ -94,6 +94,7 @@ public class HighlighterSearchTests extends AbstractSharedClusterTest {
.put("index.number_of_shards", 1)
.put("analysis.tokenizer.autocomplete.max_gram", 20)
.put("analysis.tokenizer.autocomplete.min_gram", 1)
.put("analysis.tokenizer.autocomplete.token_chars", "letter,digit")
.put("analysis.tokenizer.autocomplete.type", "nGram")
.put("analysis.filter.wordDelimiter.type", "word_delimiter")
.putArray("analysis.filter.wordDelimiter.type_table",
@ -283,6 +284,7 @@ public class HighlighterSearchTests extends AbstractSharedClusterTest {
.put("analysis.filter.my_ngram.type", "ngram")
.put("analysis.tokenizer.my_ngramt.max_gram", 20)
.put("analysis.tokenizer.my_ngramt.min_gram", 1)
.put("analysis.tokenizer.my_ngramt.token_chars", "letter,digit")
.put("analysis.tokenizer.my_ngramt.type", "ngram")
.put("analysis.analyzer.name_index_analyzer.tokenizer", "my_ngramt")
.put("analysis.analyzer.name2_index_analyzer.tokenizer", "whitespace")

87
src/test/java/org/elasticsearch/test/unit/index/analysis/NGramTokenizerFactoryTests.java Normal file
View File

@ -0,0 +1,87 @@
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.
*/
package org.elasticsearch.test.unit.index.analysis;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.analysis.EdgeNGramTokenizerFactory;
import org.elasticsearch.index.analysis.NGramTokenizerFactory;
import org.testng.annotations.Test;
import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import static org.testng.Assert.fail;
public class NGramTokenizerFactoryTests {
@Test
public void testParseTokenChars() {
final Index index = new Index("test");
final String name = "ngr";
final Settings indexSettings = ImmutableSettings.EMPTY;
for (String tokenChars : Arrays.asList("letters", "number", "DIRECTIONALITY_UNDEFINED")) {
final Settings settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", tokenChars).build();
try {
new NGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader(""));
fail();
} catch (ElasticSearchIllegalArgumentException expected) {
// OK
}
}
for (String tokenChars : Arrays.asList("letter", " digit ", "punctuation", "DIGIT", "CoNtRoL", "dash_punctuation")) {
final Settings settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", tokenChars).build();
new NGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader(""));
// no exception
}
}
@Test
public void testPreTokenization() throws IOException {
// Make sure that pretokenization works well and that it can be used even with token chars which are supplementary characters
final Index index = new Index("test");
final String name = "ngr";
final Settings indexSettings = ImmutableSettings.EMPTY;
Settings settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", "letter,digit").build();
AnalysisTestsHelper.assertSimpleTSOutput(new NGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader("Åbc déf g\uD801\uDC00f ")),
new String[] {"Åb", "Åbc", "bc", "dé", "déf", "éf", "g\uD801\uDC00", "g\uD801\uDC00f", "\uD801\uDC00f"});
settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", "letter,digit,punctuation,whitespace,symbol").build();
AnalysisTestsHelper.assertSimpleTSOutput(new NGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader(" a!$ 9")),
new String[] {" a", " a!", "a!", "a!$", "!$", "!$ ", "$ ", "$ 9", " 9"});
}
@Test
public void testPreTokenizationEdge() throws IOException {
// Make sure that pretokenization works well and that it can be used even with token chars which are supplementary characters
final Index index = new Index("test");
final String name = "ngr";
final Settings indexSettings = ImmutableSettings.EMPTY;
Settings settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", "letter,digit").build();
AnalysisTestsHelper.assertSimpleTSOutput(new EdgeNGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader("Åbc déf g\uD801\uDC00f ")),
new String[] {"Åb", "Åbc", "dé", "déf", "g\uD801\uDC00", "g\uD801\uDC00f"});
settings = ImmutableSettings.builder().put("min_gram", 2).put("max_gram", 3).put("token_chars", "letter,digit,punctuation,whitespace,symbol").build();
AnalysisTestsHelper.assertSimpleTSOutput(new EdgeNGramTokenizerFactory(index, indexSettings, name, settings).create(new StringReader(" a!$ 9")),
new String[] {" a", " a!"});
}
}