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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.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermRangeQuery;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.internal.FieldNamesFieldMapper;
import org.elasticsearch.index.mapper.object.ObjectMapper;
import java.io.IOException;
import java.util.Collection;
import java.util.Objects;
/**
* Constructs a query that only match on documents that the field has a value in them.
*/
public class ExistsQueryBuilder extends AbstractQueryBuilder<ExistsQueryBuilder> {
public static final String NAME = "exists";
private final String fieldName;
static final ExistsQueryBuilder PROTOTYPE = new ExistsQueryBuilder("field");
public ExistsQueryBuilder(String fieldName) {
if (Strings.isEmpty(fieldName)) {
throw new IllegalArgumentException("field name is null or empty");
}
this.fieldName = fieldName;
}
/**
* @return the field name that has to exist for this query to match
*/
public String fieldName() {
return this.fieldName;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
builder.field(ExistsQueryParser.FIELD_FIELD.getPreferredName(), fieldName);
printBoostAndQueryName(builder);
builder.endObject();
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
return newFilter(context, fieldName);
}
public static Query newFilter(QueryShardContext context, String fieldPattern) {
final FieldNamesFieldMapper.FieldNamesFieldType fieldNamesFieldType = (FieldNamesFieldMapper.FieldNamesFieldType)context.getMapperService().fullName(FieldNamesFieldMapper.NAME);
if (fieldNamesFieldType == null) {
// can only happen when no types exist, so no docs exist either
return Queries.newMatchNoDocsQuery();
}
ObjectMapper objectMapper = context.getObjectMapper(fieldPattern);
if (objectMapper != null) {
// automatic make the object mapper pattern
fieldPattern = fieldPattern + ".*";
}
Collection<String> fields = context.simpleMatchToIndexNames(fieldPattern);
if (fields.isEmpty()) {
// no fields exists, so we should not match anything
return Queries.newMatchNoDocsQuery();
}
BooleanQuery.Builder boolFilterBuilder = new BooleanQuery.Builder();
for (String field : fields) {
MappedFieldType fieldType = context.fieldMapper(field);
Query filter = null;
if (fieldNamesFieldType.isEnabled()) {
final String f;
if (fieldType != null) {
f = fieldType.names().indexName();
} else {
f = field;
}
filter = fieldNamesFieldType.termQuery(f, context);
}
// if _field_names are not indexed, we need to go the slow way
if (filter == null && fieldType != null) {
filter = fieldType.rangeQuery(null, null, true, true);
}
if (filter == null) {
filter = new TermRangeQuery(field, null, null, true, true);
}
boolFilterBuilder.add(filter, BooleanClause.Occur.SHOULD);
}
return new ConstantScoreQuery(boolFilterBuilder.build());
}
@Override
protected int doHashCode() {
return Objects.hash(fieldName);
}
@Override
protected boolean doEquals(ExistsQueryBuilder other) {
return Objects.equals(fieldName, other.fieldName);
}
@Override
protected ExistsQueryBuilder doReadFrom(StreamInput in) throws IOException {
return new ExistsQueryBuilder(in.readString());
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeString(fieldName);
}
@Override
public String getWriteableName() {
return NAME;
}
}
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