org.elasticsearch.index.query.SpanMultiTermQueryBuilder Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.search.BoostQuery;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.spans.SpanBoostQuery;
import org.apache.lucene.search.spans.SpanMultiTermQueryWrapper;
import org.apache.lucene.search.spans.SpanQuery;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
import java.util.Objects;
import java.util.Optional;
/**
* Query that allows wraping a {@link MultiTermQueryBuilder} (one of wildcard, fuzzy, prefix, term, range or regexp query)
* as a {@link SpanQueryBuilder} so it can be nested.
*/
public class SpanMultiTermQueryBuilder extends AbstractQueryBuilder
implements SpanQueryBuilder {
public static final String NAME = "span_multi";
private static final ParseField MATCH_FIELD = new ParseField("match");
private final MultiTermQueryBuilder multiTermQueryBuilder;
public SpanMultiTermQueryBuilder(MultiTermQueryBuilder multiTermQueryBuilder) {
if (multiTermQueryBuilder == null) {
throw new IllegalArgumentException("inner multi term query cannot be null");
}
this.multiTermQueryBuilder = multiTermQueryBuilder;
}
/**
* Read from a stream.
*/
public SpanMultiTermQueryBuilder(StreamInput in) throws IOException {
super(in);
multiTermQueryBuilder = (MultiTermQueryBuilder) in.readNamedWriteable(QueryBuilder.class);
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(multiTermQueryBuilder);
}
public MultiTermQueryBuilder innerQuery() {
return this.multiTermQueryBuilder;
}
@Override
protected void doXContent(XContentBuilder builder, Params params)
throws IOException {
builder.startObject(NAME);
builder.field(MATCH_FIELD.getPreferredName());
multiTermQueryBuilder.toXContent(builder, params);
printBoostAndQueryName(builder);
builder.endObject();
}
public static Optional fromXContent(QueryParseContext parseContext) throws IOException {
XContentParser parser = parseContext.parser();
String currentFieldName = null;
MultiTermQueryBuilder subQuery = null;
String queryName = null;
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if (parseContext.getParseFieldMatcher().match(currentFieldName, MATCH_FIELD)) {
Optional query = parseContext.parseInnerQueryBuilder();
if (query.isPresent() == false || query.get() instanceof MultiTermQueryBuilder == false) {
throw new ParsingException(parser.getTokenLocation(),
"[span_multi] [" + MATCH_FIELD.getPreferredName() + "] must be of type multi term query");
}
subQuery = (MultiTermQueryBuilder) query.get();
} else {
throw new ParsingException(parser.getTokenLocation(), "[span_multi] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if (parseContext.getParseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.NAME_FIELD)) {
queryName = parser.text();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.BOOST_FIELD)) {
boost = parser.floatValue();
} else {
throw new ParsingException(parser.getTokenLocation(), "[span_multi] query does not support [" + currentFieldName + "]");
}
}
}
if (subQuery == null) {
throw new ParsingException(parser.getTokenLocation(),
"[span_multi] must have [" + MATCH_FIELD.getPreferredName() + "] multi term query clause");
}
return Optional.of(new SpanMultiTermQueryBuilder(subQuery).queryName(queryName).boost(boost));
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
Query subQuery = multiTermQueryBuilder.toQuery(context);
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
if (subQuery instanceof BoostQuery) {
BoostQuery boostQuery = (BoostQuery) subQuery;
subQuery = boostQuery.getQuery();
boost = boostQuery.getBoost();
}
//no MultiTermQuery extends SpanQuery, so SpanBoostQuery is not supported here
assert subQuery instanceof SpanBoostQuery == false;
if (subQuery instanceof MultiTermQuery == false) {
throw new UnsupportedOperationException("unsupported inner query, should be " + MultiTermQuery.class.getName() +" but was "
+ subQuery.getClass().getName());
}
SpanQuery wrapper = new SpanMultiTermQueryWrapper<>((MultiTermQuery) subQuery);
if (boost != AbstractQueryBuilder.DEFAULT_BOOST) {
wrapper = new SpanBoostQuery(wrapper, boost);
}
return wrapper;
}
@Override
protected int doHashCode() {
return Objects.hash(multiTermQueryBuilder);
}
@Override
protected boolean doEquals(SpanMultiTermQueryBuilder other) {
return Objects.equals(multiTermQueryBuilder, other.multiTermQueryBuilder);
}
@Override
public String getWriteableName() {
return NAME;
}
}