/*
* 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.apache.lucene.queries.ExtendedCommonTermsQuery;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.support.QueryParsers;
import org.elasticsearch.index.search.MatchQuery;
import java.io.IOException;
/**
*
*/
public class MatchQueryParser implements QueryParser {
public static final String NAME = "match";
@Inject
public MatchQueryParser() {
}
@Override
public String[] names() {
return new String[]{
NAME, "match_phrase", "matchPhrase", "match_phrase_prefix", "matchPhrasePrefix", "matchFuzzy", "match_fuzzy", "fuzzy_match"
};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
MatchQuery.Type type = MatchQuery.Type.BOOLEAN;
if ("match_phrase".equals(parser.currentName()) || "matchPhrase".equals(parser.currentName()) ||
"text_phrase".equals(parser.currentName()) || "textPhrase".equals(parser.currentName())) {
type = MatchQuery.Type.PHRASE;
} else if ("match_phrase_prefix".equals(parser.currentName()) || "matchPhrasePrefix".equals(parser.currentName()) ||
"text_phrase_prefix".equals(parser.currentName()) || "textPhrasePrefix".equals(parser.currentName())) {
type = MatchQuery.Type.PHRASE_PREFIX;
}
XContentParser.Token token = parser.nextToken();
if (token != XContentParser.Token.FIELD_NAME) {
throw new QueryParsingException(parseContext.index(), "[match] query malformed, no field");
}
String fieldName = parser.currentName();
Object value = null;
float boost = 1.0f;
MatchQuery matchQuery = new MatchQuery(parseContext);
String minimumShouldMatch = null;
String queryName = null;
token = parser.nextToken();
if (token == XContentParser.Token.START_OBJECT) {
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if ("query".equals(currentFieldName)) {
value = parser.objectText();
} else if ("type".equals(currentFieldName)) {
String tStr = parser.text();
if ("boolean".equals(tStr)) {
type = MatchQuery.Type.BOOLEAN;
} else if ("phrase".equals(tStr)) {
type = MatchQuery.Type.PHRASE;
} else if ("phrase_prefix".equals(tStr) || "phrasePrefix".equals(currentFieldName)) {
type = MatchQuery.Type.PHRASE_PREFIX;
} else {
throw new QueryParsingException(parseContext.index(), "[match] query does not support type " + tStr);
}
} else if ("analyzer".equals(currentFieldName)) {
String analyzer = parser.text();
if (parseContext.analysisService().analyzer(analyzer) == null) {
throw new QueryParsingException(parseContext.index(), "[match] analyzer [" + parser.text() + "] not found");
}
matchQuery.setAnalyzer(analyzer);
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("slop".equals(currentFieldName) || "phrase_slop".equals(currentFieldName) || "phraseSlop".equals(currentFieldName)) {
matchQuery.setPhraseSlop(parser.intValue());
} else if (Fuzziness.FIELD.match(currentFieldName, parseContext.parseFlags())) {
matchQuery.setFuzziness(Fuzziness.parse(parser));
} else if ("prefix_length".equals(currentFieldName) || "prefixLength".equals(currentFieldName)) {
matchQuery.setFuzzyPrefixLength(parser.intValue());
} else if ("max_expansions".equals(currentFieldName) || "maxExpansions".equals(currentFieldName)) {
matchQuery.setMaxExpansions(parser.intValue());
} else if ("operator".equals(currentFieldName)) {
String op = parser.text();
if ("or".equalsIgnoreCase(op)) {
matchQuery.setOccur(BooleanClause.Occur.SHOULD);
} else if ("and".equalsIgnoreCase(op)) {
matchQuery.setOccur(BooleanClause.Occur.MUST);
} else {
throw new QueryParsingException(parseContext.index(), "text query requires operator to be either 'and' or 'or', not [" + op + "]");
}
} else if ("minimum_should_match".equals(currentFieldName) || "minimumShouldMatch".equals(currentFieldName)) {
minimumShouldMatch = parser.textOrNull();
} else if ("rewrite".equals(currentFieldName)) {
matchQuery.setRewriteMethod(QueryParsers.parseRewriteMethod(parser.textOrNull(), null));
} else if ("fuzzy_rewrite".equals(currentFieldName) || "fuzzyRewrite".equals(currentFieldName)) {
matchQuery.setFuzzyRewriteMethod(QueryParsers.parseRewriteMethod(parser.textOrNull(), null));
} else if ("fuzzy_transpositions".equals(currentFieldName)) {
matchQuery.setTranspositions(parser.booleanValue());
} else if ("lenient".equals(currentFieldName)) {
matchQuery.setLenient(parser.booleanValue());
} else if ("cutoff_frequency".equals(currentFieldName)) {
matchQuery.setCommonTermsCutoff(parser.floatValue());
} else if ("zero_terms_query".equals(currentFieldName)) {
String zeroTermsDocs = parser.text();
if ("none".equalsIgnoreCase(zeroTermsDocs)) {
matchQuery.setZeroTermsQuery(MatchQuery.ZeroTermsQuery.NONE);
} else if ("all".equalsIgnoreCase(zeroTermsDocs)) {
matchQuery.setZeroTermsQuery(MatchQuery.ZeroTermsQuery.ALL);
} else {
throw new QueryParsingException(parseContext.index(), "Unsupported zero_terms_docs value [" + zeroTermsDocs + "]");
}
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[match] query does not support [" + currentFieldName + "]");
}
}
}
parser.nextToken();
} else {
value = parser.objectText();
// move to the next token
token = parser.nextToken();
if (token != XContentParser.Token.END_OBJECT) {
throw new QueryParsingException(parseContext.index(), "[match] query parsed in simplified form, with direct field name, but included more options than just the field name, possibly use its 'options' form, with 'query' element?");
}
}
if (value == null) {
throw new QueryParsingException(parseContext.index(), "No text specified for text query");
}
Query query = matchQuery.parse(type, fieldName, value);
if (query == null) {
return null;
}
if (query instanceof BooleanQuery) {
Queries.applyMinimumShouldMatch((BooleanQuery) query, minimumShouldMatch);
} else if (query instanceof ExtendedCommonTermsQuery) {
((ExtendedCommonTermsQuery)query).setLowFreqMinimumNumberShouldMatch(minimumShouldMatch);
}
query.setBoost(boost);
if (queryName != null) {
parseContext.addNamedQuery(queryName, query);
}
return query;
}
}