forked from elastic/elasticsearch
/
NestedDocsFilter.java
67 lines (55 loc) · 2.13 KB
/
NestedDocsFilter.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.search.nested;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.PrefixFilter;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.index.mapper.internal.TypeFieldMapper;
import java.io.IOException;
/**
* Filter that returns all nested documents.
* A nested document is a sub documents that belong to a root document.
* Nested documents share the unique id and type and optionally the _source with root documents.
*/
public class NestedDocsFilter extends Filter {
public static final NestedDocsFilter INSTANCE = new NestedDocsFilter();
private final Filter filter = nestedFilter();
private final int hashCode = filter.hashCode();
private NestedDocsFilter() {
}
@Override
public DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) throws IOException {
return filter.getDocIdSet(context, acceptDocs);
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object obj) {
return obj == INSTANCE;
}
static Filter nestedFilter() {
return new PrefixFilter(new Term(TypeFieldMapper.NAME, new BytesRef("__")));
}
}