proj.zoie.api.UIDDocIdSet.java Source code

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Here is the source code for proj.zoie.api.UIDDocIdSet.java

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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 UIDDocIdSet(int[] docids) {
        _sorted = docids;
    }

    public static int[] mapUID(long[] uidArray, DocIDMapper<?> mapper) {
        IntRBTreeSet idSet = new IntRBTreeSet();
        for (long uid : uidArray) {
            if (uid != ZoieIndexReader.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;
            }

        };
    }

}