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/*
* Licensed to Elasticsearch 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.search.suggest;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
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.search.spell.*;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefBuilder;
import org.apache.lucene.util.CharsRef;
import org.apache.lucene.util.CharsRefBuilder;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.automaton.LevenshteinAutomata;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParseFieldMatcher;
import org.elasticsearch.common.io.FastCharArrayReader;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.analysis.CustomAnalyzer;
import org.elasticsearch.index.analysis.NamedAnalyzer;
import org.elasticsearch.index.analysis.ShingleTokenFilterFactory;
import org.elasticsearch.index.analysis.TokenFilterFactory;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.search.suggest.SuggestionSearchContext.SuggestionContext;
import java.io.IOException;
import java.util.Comparator;
import java.util.Locale;
public final class SuggestUtils {
public static final Comparator LUCENE_FREQUENCY = new SuggestWordFrequencyComparator();
public static final Comparator SCORE_COMPARATOR = SuggestWordQueue.DEFAULT_COMPARATOR;
private SuggestUtils() {
// utils!!
}
public static DirectSpellChecker getDirectSpellChecker(DirectSpellcheckerSettings suggestion) {
DirectSpellChecker directSpellChecker = new DirectSpellChecker();
directSpellChecker.setAccuracy(suggestion.accuracy());
Comparator comparator;
switch (suggestion.sort()) {
case SCORE:
comparator = SCORE_COMPARATOR;
break;
case FREQUENCY:
comparator = LUCENE_FREQUENCY;
break;
default:
throw new IllegalArgumentException("Illegal suggest sort: " + suggestion.sort());
}
directSpellChecker.setComparator(comparator);
directSpellChecker.setDistance(suggestion.stringDistance());
directSpellChecker.setMaxEdits(suggestion.maxEdits());
directSpellChecker.setMaxInspections(suggestion.maxInspections());
directSpellChecker.setMaxQueryFrequency(suggestion.maxTermFreq());
directSpellChecker.setMinPrefix(suggestion.prefixLength());
directSpellChecker.setMinQueryLength(suggestion.minWordLength());
directSpellChecker.setThresholdFrequency(suggestion.minDocFreq());
directSpellChecker.setLowerCaseTerms(false);
return directSpellChecker;
}
public static BytesRef join(BytesRef separator, BytesRefBuilder result, BytesRef... toJoin) {
result.clear();
for (int i = 0; i < toJoin.length - 1; i++) {
result.append(toJoin[i]);
result.append(separator);
}
result.append(toJoin[toJoin.length-1]);
return result.get();
}
public static abstract class TokenConsumer {
protected CharTermAttribute charTermAttr;
protected PositionIncrementAttribute posIncAttr;
protected OffsetAttribute offsetAttr;
public void reset(TokenStream stream) {
charTermAttr = stream.addAttribute(CharTermAttribute.class);
posIncAttr = stream.addAttribute(PositionIncrementAttribute.class);
offsetAttr = stream.addAttribute(OffsetAttribute.class);
}
protected BytesRef fillBytesRef(BytesRefBuilder spare) {
spare.copyChars(charTermAttr);
return spare.get();
}
public abstract void nextToken() throws IOException;
public void end() {}
}
public static int analyze(Analyzer analyzer, BytesRef toAnalyze, String field, TokenConsumer consumer, CharsRefBuilder spare) throws IOException {
spare.copyUTF8Bytes(toAnalyze);
return analyze(analyzer, spare.get(), field, consumer);
}
public static int analyze(Analyzer analyzer, CharsRef toAnalyze, String field, TokenConsumer consumer) throws IOException {
try (TokenStream ts = analyzer.tokenStream(
field, new FastCharArrayReader(toAnalyze.chars, toAnalyze.offset, toAnalyze.length))) {
return analyze(ts, consumer);
}
}
/** NOTE: this method closes the TokenStream, even on exception, which is awkward
* because really the caller who called {@link Analyzer#tokenStream} should close it,
* but when trying that there are recursion issues when we try to use the same
* TokenStrem twice in the same recursion... */
public static int analyze(TokenStream stream, TokenConsumer consumer) throws IOException {
int numTokens = 0;
boolean success = false;
try {
stream.reset();
consumer.reset(stream);
while (stream.incrementToken()) {
consumer.nextToken();
numTokens++;
}
consumer.end();
} finally {
if (success) {
stream.close();
} else {
IOUtils.closeWhileHandlingException(stream);
}
}
return numTokens;
}
public static SuggestMode resolveSuggestMode(String suggestMode) {
suggestMode = suggestMode.toLowerCase(Locale.US);
if ("missing".equals(suggestMode)) {
return SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX;
} else if ("popular".equals(suggestMode)) {
return SuggestMode.SUGGEST_MORE_POPULAR;
} else if ("always".equals(suggestMode)) {
return SuggestMode.SUGGEST_ALWAYS;
} else {
throw new IllegalArgumentException("Illegal suggest mode " + suggestMode);
}
}
public static Suggest.Suggestion.Sort resolveSort(String sortVal) {
if ("score".equals(sortVal)) {
return Suggest.Suggestion.Sort.SCORE;
} else if ("frequency".equals(sortVal)) {
return Suggest.Suggestion.Sort.FREQUENCY;
} else {
throw new IllegalArgumentException("Illegal suggest sort " + sortVal);
}
}
public static StringDistance resolveDistance(String distanceVal) {
if ("internal".equals(distanceVal)) {
return DirectSpellChecker.INTERNAL_LEVENSHTEIN;
} else if ("damerau_levenshtein".equals(distanceVal) || "damerauLevenshtein".equals(distanceVal)) {
return new LuceneLevenshteinDistance();
} else if ("levenstein".equals(distanceVal)) {
return new LevensteinDistance();
//TODO Jaro and Winkler are 2 people - so apply same naming logic as damerau_levenshtein
} else if ("jarowinkler".equals(distanceVal)) {
return new JaroWinklerDistance();
} else if ("ngram".equals(distanceVal)) {
return new NGramDistance();
} else {
throw new IllegalArgumentException("Illegal distance option " + distanceVal);
}
}
public static class Fields {
public static final ParseField STRING_DISTANCE = new ParseField("string_distance");
public static final ParseField SUGGEST_MODE = new ParseField("suggest_mode");
public static final ParseField MAX_EDITS = new ParseField("max_edits");
public static final ParseField MAX_INSPECTIONS = new ParseField("max_inspections");
// TODO some of these constants are the same as MLT constants and
// could be moved to a shared class for maintaining consistency across
// the platform
public static final ParseField MAX_TERM_FREQ = new ParseField("max_term_freq");
public static final ParseField PREFIX_LENGTH = new ParseField("prefix_length", "prefix_len");
public static final ParseField MIN_WORD_LENGTH = new ParseField("min_word_length", "min_word_len");
public static final ParseField MIN_DOC_FREQ = new ParseField("min_doc_freq");
public static final ParseField SHARD_SIZE = new ParseField("shard_size");
}
public static boolean parseDirectSpellcheckerSettings(XContentParser parser, String fieldName,
DirectSpellcheckerSettings suggestion, ParseFieldMatcher parseFieldMatcher) throws IOException {
if ("accuracy".equals(fieldName)) {
suggestion.accuracy(parser.floatValue());
} else if (parseFieldMatcher.match(fieldName, Fields.SUGGEST_MODE)) {
suggestion.suggestMode(SuggestUtils.resolveSuggestMode(parser.text()));
} else if ("sort".equals(fieldName)) {
suggestion.sort(SuggestUtils.resolveSort(parser.text()));
} else if (parseFieldMatcher.match(fieldName, Fields.STRING_DISTANCE)) {
suggestion.stringDistance(SuggestUtils.resolveDistance(parser.text()));
} else if (parseFieldMatcher.match(fieldName, Fields.MAX_EDITS)) {
suggestion.maxEdits(parser.intValue());
if (suggestion.maxEdits() < 1 || suggestion.maxEdits() > LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE) {
throw new IllegalArgumentException("Illegal max_edits value " + suggestion.maxEdits());
}
} else if (parseFieldMatcher.match(fieldName, Fields.MAX_INSPECTIONS)) {
suggestion.maxInspections(parser.intValue());
} else if (parseFieldMatcher.match(fieldName, Fields.MAX_TERM_FREQ)) {
suggestion.maxTermFreq(parser.floatValue());
} else if (parseFieldMatcher.match(fieldName, Fields.PREFIX_LENGTH)) {
suggestion.prefixLength(parser.intValue());
} else if (parseFieldMatcher.match(fieldName, Fields.MIN_WORD_LENGTH)) {
suggestion.minQueryLength(parser.intValue());
} else if (parseFieldMatcher.match(fieldName, Fields.MIN_DOC_FREQ)) {
suggestion.minDocFreq(parser.floatValue());
} else {
return false;
}
return true;
}
public static boolean parseSuggestContext(XContentParser parser, MapperService mapperService, String fieldName,
SuggestionSearchContext.SuggestionContext suggestion, ParseFieldMatcher parseFieldMatcher) throws IOException {
if ("analyzer".equals(fieldName)) {
String analyzerName = parser.text();
Analyzer analyzer = mapperService.analysisService().analyzer(analyzerName);
if (analyzer == null) {
throw new IllegalArgumentException("Analyzer [" + analyzerName + "] doesn't exists");
}
suggestion.setAnalyzer(analyzer);
} else if ("field".equals(fieldName)) {
suggestion.setField(parser.text());
} else if ("size".equals(fieldName)) {
suggestion.setSize(parser.intValue());
} else if (parseFieldMatcher.match(fieldName, Fields.SHARD_SIZE)) {
suggestion.setShardSize(parser.intValue());
} else {
return false;
}
return true;
}
public static void verifySuggestion(MapperService mapperService, BytesRef globalText, SuggestionContext suggestion) {
// Verify options and set defaults
if (suggestion.getField() == null) {
throw new IllegalArgumentException("The required field option is missing");
}
if (suggestion.getText() == null) {
if (globalText == null) {
throw new IllegalArgumentException("The required text option is missing");
}
suggestion.setText(globalText);
}
if (suggestion.getAnalyzer() == null) {
suggestion.setAnalyzer(mapperService.searchAnalyzer());
}
if (suggestion.getShardSize() == -1) {
suggestion.setShardSize(Math.max(suggestion.getSize(), 5));
}
}
public static ShingleTokenFilterFactory.Factory getShingleFilterFactory(Analyzer analyzer) {
if (analyzer instanceof NamedAnalyzer) {
analyzer = ((NamedAnalyzer)analyzer).analyzer();
}
if (analyzer instanceof CustomAnalyzer) {
final CustomAnalyzer a = (CustomAnalyzer) analyzer;
final TokenFilterFactory[] tokenFilters = a.tokenFilters();
for (TokenFilterFactory tokenFilterFactory : tokenFilters) {
if (tokenFilterFactory instanceof ShingleTokenFilterFactory) {
return ((ShingleTokenFilterFactory)tokenFilterFactory).getInnerFactory();
} else if (tokenFilterFactory instanceof ShingleTokenFilterFactory.Factory) {
return (ShingleTokenFilterFactory.Factory) tokenFilterFactory;
}
}
}
return null;
}
}
