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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.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;
/**
* 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<SpanMultiTermQueryBuilder>
implements SpanQueryBuilder<SpanMultiTermQueryBuilder> {
public static final String NAME = "span_multi";
public static final ParseField QUERY_NAME_FIELD = new ParseField(NAME);
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 SpanMultiTermQueryBuilder 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)) {
QueryBuilder innerQuery = parseContext.parseInnerQueryBuilder();
if (innerQuery instanceof MultiTermQueryBuilder == false) {
throw new ParsingException(parser.getTokenLocation(),
"[span_multi] [" + MATCH_FIELD.getPreferredName() + "] must be of type multi term query");
}
subQuery = (MultiTermQueryBuilder) innerQuery;
} 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 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;
}
}
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