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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.queries.SpanMatchNoDocsQuery;
import org.apache.lucene.search.BoostQuery;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.MatchNoDocsQuery;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopTermsRewrite;
import org.apache.lucene.search.spans.SpanMultiTermQueryWrapper;
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.lucene.search.SpanBooleanQueryRewriteWithMaxClause;
import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.query.support.QueryParsers;
import java.io.IOException;
import java.util.Objects;
/**
* Query that allows wrapping 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 SpanMultiTermQueryBuilder fromXContent(XContentParser parser) throws IOException {
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 (MATCH_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
QueryBuilder query = parseInnerQueryBuilder(parser);
if (query instanceof MultiTermQueryBuilder == false) {
throw new ParsingException(parser.getTokenLocation(),
"[span_multi] [" + MATCH_FIELD.getPreferredName() + "] must be of type multi term query");
}
subQuery = (MultiTermQueryBuilder) query;
} else {
throw new ParsingException(parser.getTokenLocation(), "[span_multi] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if (AbstractQueryBuilder.NAME_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
queryName = parser.text();
} else if (AbstractQueryBuilder.BOOST_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
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 {
if (multiTermQueryBuilder instanceof PrefixQueryBuilder) {
PrefixQueryBuilder prefixBuilder = (PrefixQueryBuilder) multiTermQueryBuilder;
MappedFieldType fieldType = context.fieldMapper(multiTermQueryBuilder.fieldName());
if (fieldType == null) {
return new SpanMatchNoDocsQuery(multiTermQueryBuilder.fieldName(), "unknown field");
}
final SpanMultiTermQueryWrapper.SpanRewriteMethod spanRewriteMethod;
if (prefixBuilder.rewrite() != null) {
MultiTermQuery.RewriteMethod rewriteMethod =
QueryParsers.parseRewriteMethod(prefixBuilder.rewrite(), null, LoggingDeprecationHandler.INSTANCE);
if (rewriteMethod instanceof TopTermsRewrite) {
TopTermsRewrite innerRewrite = (TopTermsRewrite) rewriteMethod;
spanRewriteMethod = new SpanMultiTermQueryWrapper.TopTermsSpanBooleanQueryRewrite(innerRewrite.getSize());
} else {
spanRewriteMethod = new SpanBooleanQueryRewriteWithMaxClause();
}
} else {
spanRewriteMethod = new SpanBooleanQueryRewriteWithMaxClause();
}
return fieldType.spanPrefixQuery(prefixBuilder.value(), spanRewriteMethod, context);
} else {
Query subQuery = multiTermQueryBuilder.toQuery(context);
while (true) {
if (subQuery instanceof ConstantScoreQuery) {
subQuery = ((ConstantScoreQuery) subQuery).getQuery();
} else if (subQuery instanceof BoostQuery) {
BoostQuery boostQuery = (BoostQuery) subQuery;
subQuery = boostQuery.getQuery();
} else {
break;
}
}
if (subQuery instanceof MatchNoDocsQuery) {
return new SpanMatchNoDocsQuery(multiTermQueryBuilder.fieldName(), subQuery.toString());
} else if (subQuery instanceof MultiTermQuery == false) {
throw new UnsupportedOperationException("unsupported inner query, should be "
+ MultiTermQuery.class.getName() + " but was " + subQuery.getClass().getName());
}
MultiTermQuery multiTermQuery = (MultiTermQuery) subQuery;
SpanMultiTermQueryWrapper wrapper = new SpanMultiTermQueryWrapper<>(multiTermQuery);
if (multiTermQuery.getRewriteMethod() instanceof TopTermsRewrite == false) {
wrapper.setRewriteMethod(new SpanBooleanQueryRewriteWithMaxClause());
}
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;
}
}