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HasParentFilterParser.java
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HasParentFilterParser.java
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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.Filter;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.NotFilter;
import org.elasticsearch.common.lucene.search.XBooleanFilter;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.support.XContentStructure;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.internal.ParentFieldMapper;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import org.elasticsearch.index.search.child.DeleteByQueryWrappingFilter;
import org.elasticsearch.index.search.child.ParentConstantScoreQuery;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
/**
*
*/
public class HasParentFilterParser implements FilterParser {
public static final String NAME = "has_parent";
@Inject
public HasParentFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
boolean queryFound = false;
boolean filterFound = false;
String parentType = null;
String filterName = null;
String currentFieldName = null;
XContentParser.Token token;
XContentStructure.InnerQuery innerQuery = null;
XContentStructure.InnerFilter innerFilter = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
// Usually, the query would be parsed here, but the child
// type may not have been extracted yet, so use the
// XContentStructure.<type> facade to parse if available,
// or delay parsing if not.
if ("query".equals(currentFieldName)) {
innerQuery = new XContentStructure.InnerQuery(parseContext, parentType == null ? null : new String[] {parentType});
queryFound = true;
} else if ("filter".equals(currentFieldName)) {
innerFilter = new XContentStructure.InnerFilter(parseContext, parentType == null ? null : new String[] {parentType});
filterFound = true;
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName) || "parent_type".equals(currentFieldName) || "parentType".equals(currentFieldName)) {
parentType = parser.text();
} else if ("_scope".equals(currentFieldName)) {
throw new QueryParsingException(parseContext.index(), "the [_scope] support in [has_parent] filter has been removed, use a filter as a facet_filter in the relevant global facet");
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
// noop to be backwards compatible
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
// noop to be backwards compatible
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound && !filterFound) {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter requires 'query' or 'filter' field");
}
if (parentType == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter requires 'parent_type' field");
}
Query query;
if (queryFound) {
query = innerQuery.asQuery(parentType);
} else {
query = innerFilter.asFilter(parentType);
}
if (query == null) {
return null;
}
DocumentMapper parentDocMapper = parseContext.mapperService().documentMapper(parentType);
if (parentDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter configured 'parent_type' [" + parentType + "] is not a valid type");
}
// wrap the query with type query
query = new XFilteredQuery(query, parseContext.cacheFilter(parentDocMapper.typeFilter(), null));
Set<String> parentTypes = new HashSet<String>(5);
parentTypes.add(parentType);
for (DocumentMapper documentMapper : parseContext.mapperService()) {
ParentFieldMapper parentFieldMapper = documentMapper.parentFieldMapper();
if (parentFieldMapper.active()) {
DocumentMapper parentTypeDocumentMapper = parseContext.mapperService().documentMapper(parentFieldMapper.type());
if (parentTypeDocumentMapper == null) {
// Only add this, if this parentFieldMapper (also a parent) isn't a child of another parent.
parentTypes.add(parentFieldMapper.type());
}
}
}
Filter parentFilter;
if (parentTypes.size() == 1) {
DocumentMapper documentMapper = parseContext.mapperService().documentMapper(parentTypes.iterator().next());
parentFilter = parseContext.cacheFilter(documentMapper.typeFilter(), null);
} else {
XBooleanFilter parentsFilter = new XBooleanFilter();
for (String parentTypeStr : parentTypes) {
DocumentMapper documentMapper = parseContext.mapperService().documentMapper(parentTypeStr);
Filter filter = parseContext.cacheFilter(documentMapper.typeFilter(), null);
parentsFilter.add(filter, BooleanClause.Occur.SHOULD);
}
parentFilter = parentsFilter;
}
Filter childrenFilter = parseContext.cacheFilter(new NotFilter(parentFilter), null);
Query parentConstantScoreQuery = new ParentConstantScoreQuery(query, parentType, childrenFilter);
if (filterName != null) {
parseContext.addNamedFilter(filterName, new CustomQueryWrappingFilter(parentConstantScoreQuery));
}
boolean deleteByQuery = "delete_by_query".equals(SearchContext.current().source());
if (deleteByQuery) {
return new DeleteByQueryWrappingFilter(parentConstantScoreQuery);
} else {
return new CustomQueryWrappingFilter(parentConstantScoreQuery);
}
}
}