org.elasticsearch.index.query.HasChildFilterParser Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.index.query;
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.XConstantScoreQuery;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.search.child.ChildrenConstantScoreQuery;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import org.elasticsearch.index.search.child.DeleteByQueryWrappingFilter;
import org.elasticsearch.index.search.nested.NonNestedDocsFilter;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
*
*/
public class HasChildFilterParser implements FilterParser {
public static final String NAME = "has_child";
@Inject
public HasChildFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Query query = null;
boolean queryFound = false;
String childType = null;
int shortCircuitParentDocSet = 8192; // Tests show a cut of point between 8192 and 16384.
String filterName = null;
String currentFieldName = null;
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 ("query".equals(currentFieldName)) {
// TODO we need to set the type, but, `query` can come before `type`...
// since we switch types, make sure we change the context
String[] origTypes = QueryParseContext.setTypesWithPrevious(childType == null ? null : new String[]{childType});
try {
query = parseContext.parseInnerQuery();
queryFound = true;
} finally {
QueryParseContext.setTypes(origTypes);
}
} else if ("filter".equals(currentFieldName)) {
// TODO handle `filter` element before `type` element...
String[] origTypes = QueryParseContext.setTypesWithPrevious(childType == null ? null : new String[]{childType});
try {
Filter innerFilter = parseContext.parseInnerFilter();
query = new XConstantScoreQuery(innerFilter);
queryFound = true;
} finally {
QueryParseContext.setTypes(origTypes);
}
} else {
throw new QueryParsingException(parseContext.index(), "[has_child] filter does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName) || "child_type".equals(currentFieldName) || "childType".equals(currentFieldName)) {
childType = parser.text();
} else if ("_scope".equals(currentFieldName)) {
throw new QueryParsingException(parseContext.index(), "the [_scope] support in [has_child] 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 if ("short_circuit_cutoff".equals(currentFieldName)) {
shortCircuitParentDocSet = parser.intValue();
} else {
throw new QueryParsingException(parseContext.index(), "[has_child] filter does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[has_child] filter requires 'query' field");
}
if (query == null) {
return null;
}
if (childType == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] filter requires 'type' field");
}
DocumentMapper childDocMapper = parseContext.mapperService().documentMapper(childType);
if (childDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "No mapping for for type [" + childType + "]");
}
if (!childDocMapper.parentFieldMapper().active()) {
throw new QueryParsingException(parseContext.index(), "Type [" + childType + "] does not have parent mapping");
}
String parentType = childDocMapper.parentFieldMapper().type();
// wrap the query with type query
query = new XFilteredQuery(query, parseContext.cacheFilter(childDocMapper.typeFilter(), null));
DocumentMapper parentDocMapper = parseContext.mapperService().documentMapper(parentType);
if (parentDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] Type [" + childType + "] points to a non existent parent type [" + parentType + "]");
}
Filter nonNestedDocsFilter = null;
if (parentDocMapper.hasNestedObjects()) {
nonNestedDocsFilter = parseContext.cacheFilter(NonNestedDocsFilter.INSTANCE, null);
}
Filter parentFilter = parseContext.cacheFilter(parentDocMapper.typeFilter(), null);
Query childrenConstantScoreQuery = new ChildrenConstantScoreQuery(query, parentType, childType, parentFilter, shortCircuitParentDocSet, nonNestedDocsFilter);
if (filterName != null) {
parseContext.addNamedFilter(filterName, new CustomQueryWrappingFilter(childrenConstantScoreQuery));
}
boolean deleteByQuery = "delete_by_query".equals(SearchContext.current().source());
if (deleteByQuery) {
return new DeleteByQueryWrappingFilter(childrenConstantScoreQuery);
} else {
return new CustomQueryWrappingFilter(childrenConstantScoreQuery);
}
}
}