package proj.zoie.api;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import it.unimi.dsi.fastutil.ints.IntRBTreeSet;
import java.io.IOException;
import java.util.Arrays;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
public class UIDDocIdSet extends DocIdSet {
private final int[] _sorted;
public UIDDocIdSet(long[] uidArray, DocIDMapper mapper) {
if (uidArray == null) {
throw new IllegalArgumentException("Input uid array is null");
}
_sorted = mapUID(uidArray, mapper);
}
public static int[] mapUID(long[] uidArray, DocIDMapper mapper) {
IntRBTreeSet idSet = new IntRBTreeSet();
for (long uid : uidArray) {
if (uid != ZoieSegmentReader.DELETED_UID) {
int docid = mapper.getDocID(uid);
if (docid != DocIDMapper.NOT_FOUND) {
idSet.add(docid);
}
}
}
return idSet.toIntArray();
}
@Override
public DocIdSetIterator iterator() {
return new DocIdSetIterator() {
int doc = -1;
int current = -1;
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() throws IOException {
if (current < _sorted.length - 1) {
current++;
doc = _sorted[current];
return doc;
}
return DocIdSetIterator.NO_MORE_DOCS;
}
@Override
public int advance(int target) throws IOException {
int idx = Arrays.binarySearch(_sorted, target);
if (idx < 0) {
idx = -(idx + 1);
if (idx >= _sorted.length) return DocIdSetIterator.NO_MORE_DOCS;
}
current = idx;
doc = _sorted[current];
return doc;
}
// No use, just implement abstract function
@Override
public long cost() {
return 0;
}
};
}
}