/*
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.apache.lucene.search;

import java.io.IOException;

import org.apache.commons.lang3.NotImplementedException;

import gnu.trove.iterator.TIntIterator;
import gnu.trove.list.TIntList;
import gnu.trove.list.array.TIntArrayList;


public class TroveDocIdSet extends DocIdSet {

    private final TIntList docIds = new TIntArrayList();

    public void add(int docId) {
        docIds.add(docId);
    }

    @Override
    public DocIdSetIterator iterator() throws IOException {
        return new DocIdSetIterator() {

            private final TIntIterator iterator = docIds.iterator();

            private int currentDoc = -1;

            @Override
            public int nextDoc() throws IOException {
                if (iterator.hasNext()) {
                    currentDoc = iterator.next();
                } else {
                    currentDoc = NO_MORE_DOCS;
                }
                return currentDoc;
            }

            @Override
            public int docID() {
                return currentDoc;
            }

            @Override
            public long cost() {
                return 0;
            }

            @Override
            public int advance(int target) throws IOException {
                throw new NotImplementedException("advance");
            }
        };
    }

}