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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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.index.search;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.Term;
import org.apache.lucene.queries.ExtendedCommonTermsQuery;
import org.apache.lucene.search.*;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.util.QueryBuilder;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.lucene.all.AllTermQuery;
import org.elasticsearch.common.lucene.search.MultiPhrasePrefixQuery;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.support.QueryParsers;
import java.io.IOException;
import java.util.List;
public class MatchQuery {
public static enum Type {
BOOLEAN,
PHRASE,
PHRASE_PREFIX
}
public static enum ZeroTermsQuery {
NONE,
ALL
}
protected final QueryParseContext parseContext;
protected String analyzer;
protected BooleanClause.Occur occur = BooleanClause.Occur.SHOULD;
protected boolean enablePositionIncrements = true;
protected int phraseSlop = 0;
protected Fuzziness fuzziness = null;
protected int fuzzyPrefixLength = FuzzyQuery.defaultPrefixLength;
protected int maxExpansions = FuzzyQuery.defaultMaxExpansions;
protected boolean transpositions = FuzzyQuery.defaultTranspositions;
protected MultiTermQuery.RewriteMethod fuzzyRewriteMethod;
protected boolean lenient;
protected ZeroTermsQuery zeroTermsQuery = ZeroTermsQuery.NONE;
protected Float commonTermsCutoff = null;
public MatchQuery(QueryParseContext parseContext) {
this.parseContext = parseContext;
}
public void setAnalyzer(String analyzer) {
this.analyzer = analyzer;
}
public void setOccur(BooleanClause.Occur occur) {
this.occur = occur;
}
public void setCommonTermsCutoff(float cutoff) {
this.commonTermsCutoff = Float.valueOf(cutoff);
}
public void setEnablePositionIncrements(boolean enablePositionIncrements) {
this.enablePositionIncrements = enablePositionIncrements;
}
public void setPhraseSlop(int phraseSlop) {
this.phraseSlop = phraseSlop;
}
public void setFuzziness(Fuzziness fuzziness) {
this.fuzziness = fuzziness;
}
public void setFuzzyPrefixLength(int fuzzyPrefixLength) {
this.fuzzyPrefixLength = fuzzyPrefixLength;
}
public void setMaxExpansions(int maxExpansions) {
this.maxExpansions = maxExpansions;
}
public void setTranspositions(boolean transpositions) {
this.transpositions = transpositions;
}
public void setFuzzyRewriteMethod(MultiTermQuery.RewriteMethod fuzzyRewriteMethod) {
this.fuzzyRewriteMethod = fuzzyRewriteMethod;
}
public void setLenient(boolean lenient) {
this.lenient = lenient;
}
public void setZeroTermsQuery(ZeroTermsQuery zeroTermsQuery) {
this.zeroTermsQuery = zeroTermsQuery;
}
protected Analyzer getAnalyzer(MappedFieldType fieldType) {
if (this.analyzer == null) {
if (fieldType != null) {
return parseContext.getSearchAnalyzer(fieldType);
}
return parseContext.mapperService().searchAnalyzer();
} else {
Analyzer analyzer = parseContext.mapperService().analysisService().analyzer(this.analyzer);
if (analyzer == null) {
throw new IllegalArgumentException("No analyzer found for [" + this.analyzer + "]");
}
return analyzer;
}
}
public Query parse(Type type, String fieldName, Object value) throws IOException {
final String field;
MappedFieldType fieldType = parseContext.fieldMapper(fieldName);
if (fieldType != null) {
field = fieldType.names().indexName();
} else {
field = fieldName;
}
/*
* If the user forced an analyzer we really don't care if they are
* searching a type that wants term queries to be used with query string
* because the QueryBuilder will take care of it. If they haven't forced
* an analyzer then types like NumberFieldType that want terms with
* query string will blow up because their analyzer isn't capable of
* passing through QueryBuilder.
*/
boolean noForcedAnalyzer = this.analyzer == null;
if (fieldType != null && fieldType.useTermQueryWithQueryString() && noForcedAnalyzer) {
return termQuery(fieldType, value);
}
Analyzer analyzer = getAnalyzer(fieldType);
assert analyzer != null;
MatchQueryBuilder builder = new MatchQueryBuilder(analyzer, fieldType);
builder.setEnablePositionIncrements(this.enablePositionIncrements);
Query query = null;
switch (type) {
case BOOLEAN:
if (commonTermsCutoff == null) {
query = builder.createBooleanQuery(field, value.toString(), occur);
} else {
query = builder.createCommonTermsQuery(field, value.toString(), occur, occur, commonTermsCutoff, fieldType);
}
break;
case PHRASE:
query = builder.createPhraseQuery(field, value.toString(), phraseSlop);
break;
case PHRASE_PREFIX:
query = builder.createPhrasePrefixQuery(field, value.toString(), phraseSlop, maxExpansions);
break;
default:
throw new IllegalStateException("No type found for [" + type + "]");
}
if (query == null) {
return zeroTermsQuery();
} else {
return query;
}
}
/**
* Creates a TermQuery-like-query for MappedFieldTypes that don't support
* QueryBuilder which is very string-ish. Just delegates to the
* MappedFieldType for MatchQuery but gets more complex for blended queries.
*/
protected Query termQuery(MappedFieldType fieldType, Object value) {
return termQuery(fieldType, value, lenient);
}
protected final Query termQuery(MappedFieldType fieldType, Object value, boolean lenient) {
try {
return fieldType.termQuery(value, parseContext);
} catch (RuntimeException e) {
if (lenient) {
return null;
}
throw e;
}
}
protected Query zeroTermsQuery() {
return zeroTermsQuery == ZeroTermsQuery.NONE ? Queries.newMatchNoDocsQuery() : Queries.newMatchAllQuery();
}
private class MatchQueryBuilder extends QueryBuilder {
private final MappedFieldType mapper;
/**
* Creates a new QueryBuilder using the given analyzer.
*/
public MatchQueryBuilder(Analyzer analyzer, @Nullable MappedFieldType mapper) {
super(analyzer);
this.mapper = mapper;
}
@Override
protected Query newTermQuery(Term term) {
return blendTermQuery(term, mapper);
}
public Query createPhrasePrefixQuery(String field, String queryText, int phraseSlop, int maxExpansions) {
final Query query = createFieldQuery(getAnalyzer(), Occur.MUST, field, queryText, true, phraseSlop);
final MultiPhrasePrefixQuery prefixQuery = new MultiPhrasePrefixQuery();
prefixQuery.setMaxExpansions(maxExpansions);
prefixQuery.setSlop(phraseSlop);
if (query instanceof PhraseQuery) {
PhraseQuery pq = (PhraseQuery)query;
Term[] terms = pq.getTerms();
int[] positions = pq.getPositions();
for (int i = 0; i < terms.length; i++) {
prefixQuery.add(new Term[] {terms[i]}, positions[i]);
}
return prefixQuery;
} else if (query instanceof MultiPhraseQuery) {
MultiPhraseQuery pq = (MultiPhraseQuery)query;
List terms = pq.getTermArrays();
int[] positions = pq.getPositions();
for (int i = 0; i < terms.size(); i++) {
prefixQuery.add(terms.get(i), positions[i]);
}
return prefixQuery;
} else if (query instanceof TermQuery) {
prefixQuery.add(((TermQuery) query).getTerm());
return prefixQuery;
} else if (query instanceof AllTermQuery) {
prefixQuery.add(((AllTermQuery) query).getTerm());
return prefixQuery;
}
return query;
}
public Query createCommonTermsQuery(String field, String queryText, Occur highFreqOccur, Occur lowFreqOccur, float maxTermFrequency, MappedFieldType fieldType) {
Query booleanQuery = createBooleanQuery(field, queryText, lowFreqOccur);
if (booleanQuery != null && booleanQuery instanceof BooleanQuery) {
BooleanQuery bq = (BooleanQuery) booleanQuery;
ExtendedCommonTermsQuery query = new ExtendedCommonTermsQuery(highFreqOccur, lowFreqOccur, maxTermFrequency, ((BooleanQuery)booleanQuery).isCoordDisabled(), fieldType);
for (BooleanClause clause : bq.clauses()) {
if (!(clause.getQuery() instanceof TermQuery)) {
return booleanQuery;
}
query.add(((TermQuery) clause.getQuery()).getTerm());
}
return query;
}
return booleanQuery;
}
}
protected Query blendTermQuery(Term term, MappedFieldType fieldType) {
if (fuzziness != null) {
if (fieldType != null) {
try {
Query query = fieldType.fuzzyQuery(term.text(), fuzziness, fuzzyPrefixLength, maxExpansions, transpositions);
if (query instanceof FuzzyQuery) {
QueryParsers.setRewriteMethod((FuzzyQuery) query, fuzzyRewriteMethod);
}
return query;
} catch (RuntimeException e) {
return new TermQuery(term);
// See long comment below about why we're lenient here.
}
}
int edits = fuzziness.asDistance(term.text());
FuzzyQuery query = new FuzzyQuery(term, edits, fuzzyPrefixLength, maxExpansions, transpositions);
QueryParsers.setRewriteMethod(query, fuzzyRewriteMethod);
return query;
}
if (fieldType != null) {
/*
* Its a bit weird to default to lenient here but its the backwards
* compatible. It makes some sense when you think about what we are
* doing here: at this point the user has forced an analyzer and
* passed some string to the match query. We cut it up using the
* analyzer and then tried to cram whatever we get into the field.
* lenient=true here means that we try the terms in the query and on
* the off chance that they are actually valid terms then we
* actually try them. lenient=false would mean that we blow up the
* query if they aren't valid terms. "valid" in this context means
* "parses properly to something of the type being queried." So "1"
* is a valid number, etc.
*
* We use the text form here because we we've received the term from
* an analyzer that cut some string into text.
*/
Query query = termQuery(fieldType, term.bytes(), true);
if (query != null) {
return query;
}
}
return new TermQuery(term);
}
}