/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.OpenBitSet;
import org.apache.lucene.util.UnicodeUtil;
import org.elasticsearch.common.Unicode;
import org.elasticsearch.common.bloom.BloomFilter;
import org.elasticsearch.index.cache.bloom.BloomCache;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class UidFilter extends Filter {
private final List<Term> uids;
private final BloomCache bloomCache;
public UidFilter(Collection<String> types, List<String> ids, BloomCache bloomCache) {
this.bloomCache = bloomCache;
this.uids = new ArrayList<Term>(types.size() * ids.size());
for (String type : types) {
for (String id : ids) {
uids.add(new Term(UidFieldMapper.NAME, Uid.createUid(type, id)));
}
}
}
// TODO Optimizations
// - If we have a single id, we can create a SingleIdDocIdSet to save on mem
// - We can use sorted int array DocIdSet to reserve memory compared to OpenBitSet in some cases
@Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
BloomFilter filter = bloomCache.filter(reader, UidFieldMapper.NAME, true);
OpenBitSet set = null;
TermDocs td = null;
try {
for (Term uid : uids) {
UnicodeUtil.UTF8Result utf8 = Unicode.fromStringAsUtf8(uid.text());
if (!filter.isPresent(utf8.result, 0, utf8.length)) {
continue;
}
if (td == null) {
td = reader.termDocs();
}
td.seek(uid);
while (td.next()) {
if (set == null) {
set = new OpenBitSet(reader.maxDoc());
}
set.fastSet(td.doc());
}
}
} finally {
if (td != null) {
td.close();
}
}
return set;
}
@Override public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
UidFilter uidFilter = (UidFilter) o;
return !uids.equals(uidFilter.uids);
}
@Override public int hashCode() {
return uids.hashCode();
}
}