org.elasticsearch.index.search.child.ParentIdCollector Maven / Gradle / Ivy
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* 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.search.child;
import java.io.IOException;
import org.apache.lucene.index.AtomicReaderContext;
import org.elasticsearch.common.bytes.HashedBytesArray;
import org.elasticsearch.common.lucene.search.NoopCollector;
import org.elasticsearch.index.cache.id.IdReaderTypeCache;
import org.elasticsearch.search.internal.SearchContext;
/**
* A simple collector that only collects if the docs parent ID is not
* null
*/
abstract class ParentIdCollector extends NoopCollector {
protected final String type;
protected final SearchContext context;
private IdReaderTypeCache typeCache;
protected ParentIdCollector(String parentType, SearchContext context) {
this.type = parentType;
this.context = context;
}
@Override
public final void collect(int doc) throws IOException {
if (typeCache != null) {
HashedBytesArray parentIdByDoc = typeCache.parentIdByDoc(doc);
if (parentIdByDoc != null) {
collect(doc, parentIdByDoc);
}
}
}
protected abstract void collect(int doc, HashedBytesArray parentId) throws IOException;
@Override
public void setNextReader(AtomicReaderContext readerContext) throws IOException {
typeCache = context.idCache().reader(readerContext.reader()).type(type);
}
}