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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.index.query;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.MoreLikeThisQueryParser.Field;
import org.elasticsearch.index.search.MatchQuery;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Same as {@link MatchQueryParser} but has support for multiple fields.
*/
public class MultiMatchQueryParser implements QueryParser<MultiMatchQueryBuilder> {
public static final ParseField SLOP_FIELD = new ParseField("slop", "phrase_slop");
public static final ParseField ZERO_TERMS_QUERY_FIELD = new ParseField("zero_terms_query");
public static final ParseField LENIENT_FIELD = new ParseField("lenient");
public static final ParseField CUTOFF_FREQUENCY_FIELD = new ParseField("cutoff_frequency");
public static final ParseField TIE_BREAKER_FIELD = new ParseField("tie_breaker");
public static final ParseField USE_DIS_MAX_FIELD = new ParseField("use_dis_max");
public static final ParseField FUZZY_REWRITE_FIELD = new ParseField("fuzzy_rewrite");
public static final ParseField MINIMUM_SHOULD_MATCH_FIELD = new ParseField("minimum_should_match");
public static final ParseField OPERATOR_FIELD = new ParseField("operator");
public static final ParseField MAX_EXPANSIONS_FIELD = new ParseField("max_expansions");
public static final ParseField PREFIX_LENGTH_FIELD = new ParseField("prefix_length");
public static final ParseField ANALYZER_FIELD = new ParseField("analyzer");
public static final ParseField TYPE_FIELD = new ParseField("type");
public static final ParseField QUERY_FIELD = new ParseField("query");
public static final ParseField FIELDS_FIELD = new ParseField("fields");
@Override
public String[] names() {
return new String[]{
MultiMatchQueryBuilder.NAME, "multiMatch"
};
}
@Override
public MultiMatchQueryBuilder fromXContent(QueryParseContext parseContext) throws IOException {
XContentParser parser = parseContext.parser();
Object value = null;
Map<String, Float> fieldsBoosts = new HashMap<>();
MultiMatchQueryBuilder.Type type = MultiMatchQueryBuilder.DEFAULT_TYPE;
String analyzer = null;
int slop = MultiMatchQueryBuilder.DEFAULT_PHRASE_SLOP;
Fuzziness fuzziness = null;
int prefixLength = MultiMatchQueryBuilder.DEFAULT_PREFIX_LENGTH;
int maxExpansions = MultiMatchQueryBuilder.DEFAULT_MAX_EXPANSIONS;
Operator operator = MultiMatchQueryBuilder.DEFAULT_OPERATOR;
String minimumShouldMatch = null;
String fuzzyRewrite = null;
Boolean useDisMax = null;
Float tieBreaker = null;
Float cutoffFrequency = null;
boolean lenient = MultiMatchQueryBuilder.DEFAULT_LENIENCY;
MatchQuery.ZeroTermsQuery zeroTermsQuery = MultiMatchQueryBuilder.DEFAULT_ZERO_TERMS_QUERY;
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
String queryName = null;
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, FIELDS_FIELD)) {
if (token == XContentParser.Token.START_ARRAY) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
parseFieldAndBoost(parser, fieldsBoosts);
}
} else if (token.isValue()) {
parseFieldAndBoost(parser, fieldsBoosts);
} else {
throw new ParsingException(parser.getTokenLocation(), "[" + MultiMatchQueryBuilder.NAME + "] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if (parseContext.parseFieldMatcher().match(currentFieldName, QUERY_FIELD)) {
value = parser.objectText();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, TYPE_FIELD)) {
type = MultiMatchQueryBuilder.Type.parse(parser.text(), parseContext.parseFieldMatcher());
} else if (parseContext.parseFieldMatcher().match(currentFieldName, ANALYZER_FIELD)) {
analyzer = parser.text();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.BOOST_FIELD)) {
boost = parser.floatValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, SLOP_FIELD)) {
slop = parser.intValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, Fuzziness.FIELD)) {
fuzziness = Fuzziness.parse(parser);
} else if (parseContext.parseFieldMatcher().match(currentFieldName, PREFIX_LENGTH_FIELD)) {
prefixLength = parser.intValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, MAX_EXPANSIONS_FIELD)) {
maxExpansions = parser.intValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, OPERATOR_FIELD)) {
operator = Operator.fromString(parser.text());
} else if (parseContext.parseFieldMatcher().match(currentFieldName, MINIMUM_SHOULD_MATCH_FIELD)) {
minimumShouldMatch = parser.textOrNull();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, FUZZY_REWRITE_FIELD)) {
fuzzyRewrite = parser.textOrNull();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, USE_DIS_MAX_FIELD)) {
useDisMax = parser.booleanValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, TIE_BREAKER_FIELD)) {
tieBreaker = parser.floatValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, CUTOFF_FREQUENCY_FIELD)) {
cutoffFrequency = parser.floatValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, LENIENT_FIELD)) {
lenient = parser.booleanValue();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, ZERO_TERMS_QUERY_FIELD)) {
String zeroTermsDocs = parser.text();
if ("none".equalsIgnoreCase(zeroTermsDocs)) {
zeroTermsQuery = MatchQuery.ZeroTermsQuery.NONE;
} else if ("all".equalsIgnoreCase(zeroTermsDocs)) {
zeroTermsQuery = MatchQuery.ZeroTermsQuery.ALL;
} else {
throw new ParsingException(parser.getTokenLocation(), "Unsupported zero_terms_docs value [" + zeroTermsDocs + "]");
}
} else if (parseContext.parseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.NAME_FIELD)) {
queryName = parser.text();
} else {
throw new ParsingException(parser.getTokenLocation(), "[" + MultiMatchQueryBuilder.NAME + "] query does not support [" + currentFieldName + "]");
}
} else {
throw new ParsingException(parser.getTokenLocation(), "[" + MultiMatchQueryBuilder.NAME + "] unknown token [" + token + "] after [" + currentFieldName + "]");
}
}
if (value == null) {
throw new ParsingException(parser.getTokenLocation(), "No text specified for multi_match query");
}
if (fieldsBoosts.isEmpty()) {
throw new ParsingException(parser.getTokenLocation(), "No fields specified for multi_match query");
}
return new MultiMatchQueryBuilder(value)
.fields(fieldsBoosts)
.type(type)
.analyzer(analyzer)
.cutoffFrequency(cutoffFrequency)
.fuzziness(fuzziness)
.fuzzyRewrite(fuzzyRewrite)
.useDisMax(useDisMax)
.lenient(lenient)
.maxExpansions(maxExpansions)
.minimumShouldMatch(minimumShouldMatch)
.operator(operator)
.prefixLength(prefixLength)
.slop(slop)
.tieBreaker(tieBreaker)
.zeroTermsQuery(zeroTermsQuery)
.boost(boost)
.queryName(queryName);
}
private void parseFieldAndBoost(XContentParser parser, Map<String, Float> fieldsBoosts) throws IOException {
String fField = null;
Float fBoost = AbstractQueryBuilder.DEFAULT_BOOST;
char[] fieldText = parser.textCharacters();
int end = parser.textOffset() + parser.textLength();
for (int i = parser.textOffset(); i < end; i++) {
if (fieldText[i] == '^') {
int relativeLocation = i - parser.textOffset();
fField = new String(fieldText, parser.textOffset(), relativeLocation);
fBoost = Float.parseFloat(new String(fieldText, i + 1, parser.textLength() - relativeLocation - 1));
break;
}
}
if (fField == null) {
fField = parser.text();
}
fieldsBoosts.put(fField, fBoost);
}
@Override
public MultiMatchQueryBuilder getBuilderPrototype() {
return MultiMatchQueryBuilder.PROTOTYPE;
}
}
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