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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.apache.lucene.queryparser.classic;
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.PositionIncrementAttribute;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.analyzing.AnalyzingQueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.BoostQuery;
import org.apache.lucene.search.DisjunctionMaxQuery;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MatchNoDocsQuery;
import org.apache.lucene.search.MultiPhraseQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.SynonymQuery;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.automaton.RegExp;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.mapper.DateFieldMapper;
import org.elasticsearch.index.mapper.LegacyDateFieldMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.StringFieldType;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.index.query.support.QueryParsers;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import static java.util.Collections.unmodifiableMap;
import static org.elasticsearch.common.lucene.search.Queries.fixNegativeQueryIfNeeded;
/**
* A query parser that uses the {@link MapperService} in order to build smarter
* queries based on the mapping information.
*
* Also breaks fields with [type].[name] into a boolean query that must include the type
* as well as the query on the name.
*/
public class MapperQueryParser extends AnalyzingQueryParser {
public static final Map FIELD_QUERY_EXTENSIONS;
static {
Map fieldQueryExtensions = new HashMap<>();
fieldQueryExtensions.put(ExistsFieldQueryExtension.NAME, new ExistsFieldQueryExtension());
FIELD_QUERY_EXTENSIONS = unmodifiableMap(fieldQueryExtensions);
}
private final QueryShardContext context;
private QueryParserSettings settings;
private MappedFieldType currentFieldType;
public MapperQueryParser(QueryShardContext context) {
super(null, null);
this.context = context;
}
public void reset(QueryParserSettings settings) {
this.settings = settings;
if (settings.fieldsAndWeights().isEmpty()) {
this.field = settings.defaultField();
} else if (settings.fieldsAndWeights().size() == 1) {
this.field = settings.fieldsAndWeights().keySet().iterator().next();
} else {
this.field = null;
}
setAnalyzer(settings.analyzer());
setMultiTermRewriteMethod(settings.rewriteMethod());
setEnablePositionIncrements(settings.enablePositionIncrements());
setAutoGeneratePhraseQueries(settings.autoGeneratePhraseQueries());
setMaxDeterminizedStates(settings.maxDeterminizedStates());
setAllowLeadingWildcard(settings.allowLeadingWildcard());
setLowercaseExpandedTerms(false);
setPhraseSlop(settings.phraseSlop());
setDefaultOperator(settings.defaultOperator());
setFuzzyPrefixLength(settings.fuzzyPrefixLength());
setSplitOnWhitespace(settings.splitOnWhitespace());
}
/**
* We override this one so we can get the fuzzy part to be treated as string,
* so people can do: "age:10~5" or "timestamp:2012-10-10~5d"
*/
@Override
Query handleBareFuzzy(String qfield, Token fuzzySlop, String termImage) throws ParseException {
if (fuzzySlop.image.length() == 1) {
return getFuzzyQuery(qfield, termImage, Float.toString(settings.fuzziness().asDistance(termImage)));
}
return getFuzzyQuery(qfield, termImage, fuzzySlop.image.substring(1));
}
@Override
protected Query newTermQuery(Term term) {
if (currentFieldType != null) {
Query termQuery = currentFieldType.queryStringTermQuery(term);
if (termQuery != null) {
return termQuery;
}
}
return super.newTermQuery(term);
}
@Override
protected Query newMatchAllDocsQuery() {
return Queries.newMatchAllQuery();
}
@Override
public Query getFieldQuery(String field, String queryText, boolean quoted) throws ParseException {
FieldQueryExtension fieldQueryExtension = FIELD_QUERY_EXTENSIONS.get(field);
if (fieldQueryExtension != null) {
return fieldQueryExtension.query(context, queryText);
}
Collection fields = extractMultiFields(field);
if (fields != null) {
if (fields.size() == 1) {
return getFieldQuerySingle(fields.iterator().next(), queryText, quoted);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getFieldQuerySingle(mField, queryText, quoted);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getFieldQuerySingle(mField, queryText, quoted);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return getFieldQuerySingle(field, queryText, quoted);
}
}
private Query getFieldQuerySingle(String field, String queryText, boolean quoted) throws ParseException {
if (!quoted && queryText.length() > 1) {
if (queryText.charAt(0) == '>') {
if (queryText.length() > 2) {
if (queryText.charAt(1) == '=') {
return getRangeQuerySingle(field, queryText.substring(2), null, true, true, context);
}
}
return getRangeQuerySingle(field, queryText.substring(1), null, false, true, context);
} else if (queryText.charAt(0) == '<') {
if (queryText.length() > 2) {
if (queryText.charAt(1) == '=') {
return getRangeQuerySingle(field, null, queryText.substring(2), true, true, context);
}
}
return getRangeQuerySingle(field, null, queryText.substring(1), true, false, context);
}
}
currentFieldType = null;
Analyzer oldAnalyzer = getAnalyzer();
try {
if (quoted) {
setAnalyzer(settings.quoteAnalyzer());
if (settings.quoteFieldSuffix() != null) {
currentFieldType = context.fieldMapper(field + settings.quoteFieldSuffix());
}
}
if (currentFieldType == null) {
currentFieldType = context.fieldMapper(field);
}
if (currentFieldType != null) {
if (quoted) {
if (!settings.forceQuoteAnalyzer()) {
setAnalyzer(context.getSearchQuoteAnalyzer(currentFieldType));
}
} else {
if (!settings.forceAnalyzer()) {
setAnalyzer(context.getSearchAnalyzer(currentFieldType));
}
}
if (currentFieldType != null) {
Query query = null;
if (currentFieldType.tokenized() == false) {
// this might be a structured field like a numeric
try {
query = currentFieldType.termQuery(queryText, context);
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
} else {
throw e;
}
}
}
if (query == null) {
query = super.getFieldQuery(currentFieldType.name(), queryText, quoted);
}
return query;
}
}
return super.getFieldQuery(field, queryText, quoted);
} finally {
setAnalyzer(oldAnalyzer);
}
}
@Override
protected Query getFieldQuery(String field, String queryText, int slop) throws ParseException {
Collection fields = extractMultiFields(field);
if (fields != null) {
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = super.getFieldQuery(mField, queryText, slop);
if (q != null) {
added = true;
q = applySlop(q, slop);
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = super.getFieldQuery(mField, queryText, slop);
if (q != null) {
q = applySlop(q, slop);
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return super.getFieldQuery(field, queryText, slop);
}
}
@Override
protected Query getRangeQuery(String field, String part1, String part2,
boolean startInclusive, boolean endInclusive) throws ParseException {
if ("*".equals(part1)) {
part1 = null;
}
if ("*".equals(part2)) {
part2 = null;
}
Collection fields = extractMultiFields(field);
if (fields == null) {
return getRangeQuerySingle(field, part1, part2, startInclusive, endInclusive, context);
}
if (fields.size() == 1) {
return getRangeQuerySingle(fields.iterator().next(), part1, part2, startInclusive, endInclusive, context);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getRangeQuerySingle(mField, part1, part2, startInclusive, endInclusive, context);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getRangeQuerySingle(mField, part1, part2, startInclusive, endInclusive, context);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
}
private Query getRangeQuerySingle(String field, String part1, String part2,
boolean startInclusive, boolean endInclusive, QueryShardContext context) {
currentFieldType = context.fieldMapper(field);
if (currentFieldType != null) {
try {
BytesRef part1Binary = part1 == null ? null : getAnalyzer().normalize(field, part1);
BytesRef part2Binary = part2 == null ? null : getAnalyzer().normalize(field, part2);
Query rangeQuery;
if (currentFieldType instanceof LegacyDateFieldMapper.DateFieldType && settings.timeZone() != null) {
LegacyDateFieldMapper.DateFieldType dateFieldType = (LegacyDateFieldMapper.DateFieldType) this.currentFieldType;
rangeQuery = dateFieldType.rangeQuery(part1Binary, part2Binary,
startInclusive, endInclusive, settings.timeZone(), null, context);
} else if (currentFieldType instanceof DateFieldMapper.DateFieldType && settings.timeZone() != null) {
DateFieldMapper.DateFieldType dateFieldType = (DateFieldMapper.DateFieldType) this.currentFieldType;
rangeQuery = dateFieldType.rangeQuery(part1Binary, part2Binary,
startInclusive, endInclusive, settings.timeZone(), null, context);
} else {
rangeQuery = currentFieldType.rangeQuery(part1Binary, part2Binary, startInclusive, endInclusive, context);
}
return rangeQuery;
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
}
throw e;
}
}
return newRangeQuery(field, part1, part2, startInclusive, endInclusive);
}
protected Query getFuzzyQuery(String field, String termStr, String minSimilarity) throws ParseException {
Collection fields = extractMultiFields(field);
if (fields != null) {
if (fields.size() == 1) {
return getFuzzyQuerySingle(fields.iterator().next(), termStr, minSimilarity);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getFuzzyQuerySingle(mField, termStr, minSimilarity);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getFuzzyQuerySingle(mField, termStr, minSimilarity);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return getFuzzyQuerySingle(field, termStr, minSimilarity);
}
}
private Query getFuzzyQuerySingle(String field, String termStr, String minSimilarity) throws ParseException {
currentFieldType = context.fieldMapper(field);
if (currentFieldType != null) {
try {
BytesRef term = termStr == null ? null : getAnalyzer().normalize(field, termStr);
return currentFieldType.fuzzyQuery(term, Fuzziness.build(minSimilarity),
getFuzzyPrefixLength(), settings.fuzzyMaxExpansions(), FuzzyQuery.defaultTranspositions);
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
}
throw e;
}
}
return super.getFuzzyQuery(field, termStr, Float.parseFloat(minSimilarity));
}
@Override
protected Query newFuzzyQuery(Term term, float minimumSimilarity, int prefixLength) {
String text = term.text();
int numEdits = FuzzyQuery.floatToEdits(minimumSimilarity, text.codePointCount(0, text.length()));
FuzzyQuery query = new FuzzyQuery(term, numEdits, prefixLength,
settings.fuzzyMaxExpansions(), FuzzyQuery.defaultTranspositions);
QueryParsers.setRewriteMethod(query, settings.fuzzyRewriteMethod());
return query;
}
@Override
protected Query getPrefixQuery(String field, String termStr) throws ParseException {
Collection fields = extractMultiFields(field);
if (fields != null) {
if (fields.size() == 1) {
return getPrefixQuerySingle(fields.iterator().next(), termStr);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getPrefixQuerySingle(mField, termStr);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getPrefixQuerySingle(mField, termStr);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return getPrefixQuerySingle(field, termStr);
}
}
private Query getPrefixQuerySingle(String field, String termStr) throws ParseException {
currentFieldType = null;
Analyzer oldAnalyzer = getAnalyzer();
try {
currentFieldType = context.fieldMapper(field);
if (currentFieldType != null) {
if (!settings.forceAnalyzer()) {
setAnalyzer(context.getSearchAnalyzer(currentFieldType));
}
Query query = null;
if (currentFieldType instanceof StringFieldType == false) {
query = currentFieldType.prefixQuery(termStr, getMultiTermRewriteMethod(), context);
}
if (query == null) {
query = getPossiblyAnalyzedPrefixQuery(currentFieldType.name(), termStr);
}
return query;
}
return getPossiblyAnalyzedPrefixQuery(field, termStr);
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
}
throw e;
} finally {
setAnalyzer(oldAnalyzer);
}
}
private Query getPossiblyAnalyzedPrefixQuery(String field, String termStr) throws ParseException {
if (!settings.analyzeWildcard()) {
return super.getPrefixQuery(field, termStr);
}
List > tlist;
// get Analyzer from superclass and tokenize the term
TokenStream source = null;
try {
try {
source = getAnalyzer().tokenStream(field, termStr);
source.reset();
} catch (IOException e) {
return super.getPrefixQuery(field, termStr);
}
tlist = new ArrayList<>();
List currentPos = new ArrayList<>();
CharTermAttribute termAtt = source.addAttribute(CharTermAttribute.class);
PositionIncrementAttribute posAtt = source.addAttribute(PositionIncrementAttribute.class);
while (true) {
try {
if (!source.incrementToken()) break;
} catch (IOException e) {
break;
}
if (currentPos.isEmpty() == false && posAtt.getPositionIncrement() > 0) {
tlist.add(currentPos);
currentPos = new ArrayList<>();
}
currentPos.add(termAtt.toString());
}
if (currentPos.isEmpty() == false) {
tlist.add(currentPos);
}
} finally {
if (source != null) {
IOUtils.closeWhileHandlingException(source);
}
}
if (tlist.size() == 0) {
return null;
}
if (tlist.size() == 1 && tlist.get(0).size() == 1) {
return super.getPrefixQuery(field, tlist.get(0).get(0));
}
// build a boolean query with prefix on the last position only.
List clauses = new ArrayList<>();
for (int pos = 0; pos < tlist.size(); pos++) {
List plist = tlist.get(pos);
boolean isLastPos = (pos == tlist.size() - 1);
Query posQuery;
if (plist.size() == 1) {
if (isLastPos) {
posQuery = super.getPrefixQuery(field, plist.get(0));
} else {
posQuery = newTermQuery(new Term(field, plist.get(0)));
}
} else if (isLastPos == false) {
// build a synonym query for terms in the same position.
Term[] terms = new Term[plist.size()];
for (int i = 0; i < plist.size(); i++) {
terms[i] = new Term(field, plist.get(i));
}
posQuery = new SynonymQuery(terms);
} else {
List innerClauses = new ArrayList<>();
for (String token : plist) {
innerClauses.add(new BooleanClause(super.getPrefixQuery(field, token),
BooleanClause.Occur.SHOULD));
}
posQuery = getBooleanQueryCoordDisabled(innerClauses);
}
clauses.add(new BooleanClause(posQuery,
getDefaultOperator() == Operator.AND ? BooleanClause.Occur.MUST : BooleanClause.Occur.SHOULD));
}
return getBooleanQuery(clauses);
}
@Override
protected Query getWildcardQuery(String field, String termStr) throws ParseException {
if (termStr.equals("*")) {
// we want to optimize for match all query for the "*:*", and "*" cases
if ("*".equals(field) || Objects.equals(field, this.field)) {
String actualField = field;
if (actualField == null) {
actualField = this.field;
}
if (actualField == null) {
return newMatchAllDocsQuery();
}
if ("*".equals(actualField) || "_all".equals(actualField)) {
return newMatchAllDocsQuery();
}
// effectively, we check if a field exists or not
return FIELD_QUERY_EXTENSIONS.get(ExistsFieldQueryExtension.NAME).query(context, actualField);
}
}
Collection fields = extractMultiFields(field);
if (fields != null) {
if (fields.size() == 1) {
return getWildcardQuerySingle(fields.iterator().next(), termStr);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getWildcardQuerySingle(mField, termStr);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getWildcardQuerySingle(mField, termStr);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return getWildcardQuerySingle(field, termStr);
}
}
private Query getWildcardQuerySingle(String field, String termStr) throws ParseException {
String indexedNameField = field;
currentFieldType = null;
Analyzer oldAnalyzer = getAnalyzer();
try {
currentFieldType = context.fieldMapper(field);
if (currentFieldType != null) {
if (!settings.forceAnalyzer()) {
setAnalyzer(context.getSearchAnalyzer(currentFieldType));
}
indexedNameField = currentFieldType.name();
}
return super.getWildcardQuery(indexedNameField, termStr);
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
}
throw e;
} finally {
setAnalyzer(oldAnalyzer);
}
}
@Override
protected Query getRegexpQuery(String field, String termStr) throws ParseException {
Collection fields = extractMultiFields(field);
if (fields != null) {
if (fields.size() == 1) {
return getRegexpQuerySingle(fields.iterator().next(), termStr);
}
if (settings.useDisMax()) {
List queries = new ArrayList<>();
boolean added = false;
for (String mField : fields) {
Query q = getRegexpQuerySingle(mField, termStr);
if (q != null) {
added = true;
queries.add(applyBoost(mField, q));
}
}
if (!added) {
return null;
}
return new DisjunctionMaxQuery(queries, settings.tieBreaker());
} else {
List clauses = new ArrayList<>();
for (String mField : fields) {
Query q = getRegexpQuerySingle(mField, termStr);
if (q != null) {
clauses.add(new BooleanClause(applyBoost(mField, q), BooleanClause.Occur.SHOULD));
}
}
if (clauses.isEmpty()) return null; // happens for stopwords
return getBooleanQueryCoordDisabled(clauses);
}
} else {
return getRegexpQuerySingle(field, termStr);
}
}
private Query getRegexpQuerySingle(String field, String termStr) throws ParseException {
currentFieldType = null;
Analyzer oldAnalyzer = getAnalyzer();
try {
currentFieldType = context.fieldMapper(field);
if (currentFieldType != null) {
if (!settings.forceAnalyzer()) {
setAnalyzer(context.getSearchAnalyzer(currentFieldType));
}
Query query = null;
if (currentFieldType.tokenized() == false) {
query = currentFieldType.regexpQuery(termStr, RegExp.ALL,
getMaxDeterminizedStates(), getMultiTermRewriteMethod(), context);
}
if (query == null) {
query = super.getRegexpQuery(field, termStr);
}
return query;
}
return super.getRegexpQuery(field, termStr);
} catch (RuntimeException e) {
if (settings.lenient()) {
return null;
}
throw e;
} finally {
setAnalyzer(oldAnalyzer);
}
}
/**
* @deprecated review all use of this, don't rely on coord
*/
@Deprecated
protected Query getBooleanQueryCoordDisabled(List clauses) throws ParseException {
BooleanQuery.Builder builder = new BooleanQuery.Builder();
builder.setDisableCoord(true);
for (BooleanClause clause : clauses) {
builder.add(clause);
}
return fixNegativeQueryIfNeeded(builder.build());
}
@Override
protected Query getBooleanQuery(List clauses) throws ParseException {
Query q = super.getBooleanQuery(clauses);
if (q == null) {
return null;
}
return fixNegativeQueryIfNeeded(q);
}
private Query applyBoost(String field, Query q) {
Float fieldBoost = settings.fieldsAndWeights().get(field);
if (fieldBoost != null && fieldBoost != 1f) {
return new BoostQuery(q, fieldBoost);
}
return q;
}
private Query applySlop(Query q, int slop) {
if (q instanceof PhraseQuery) {
PhraseQuery pq = (PhraseQuery) q;
PhraseQuery.Builder builder = new PhraseQuery.Builder();
builder.setSlop(slop);
final Term[] terms = pq.getTerms();
final int[] positions = pq.getPositions();
for (int i = 0; i < terms.length; ++i) {
builder.add(terms[i], positions[i]);
}
pq = builder.build();
//make sure that the boost hasn't been set beforehand, otherwise we'd lose it
assert q instanceof BoostQuery == false;
return pq;
} else if (q instanceof MultiPhraseQuery) {
MultiPhraseQuery.Builder builder = new MultiPhraseQuery.Builder((MultiPhraseQuery) q);
builder.setSlop(slop);
return builder.build();
} else {
return q;
}
}
private Collection extractMultiFields(String field) {
Collection fields;
if (field != null) {
fields = context.simpleMatchToIndexNames(field);
} else {
fields = settings.fieldsAndWeights().keySet();
}
return fields;
}
@Override
public Query parse(String query) throws ParseException {
if (query.trim().isEmpty()) {
// if the query string is empty we return no docs / empty result
// the behavior is simple to change in the client if all docs is required
// or a default query
return new MatchNoDocsQuery();
}
return super.parse(query);
}
}