/*
 * Copyright 2009-2010 by The Regents of the University of California
 * Licensed 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 from
 * 
 *     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 edu.uci.ics.hyracks.storage.am.lsm.rtree.tuples;

import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleReference;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMTreeTupleReference;

public class LSMRTreeTupleReference extends TypeAwareTupleReference implements ILSMTreeTupleReference {

    public LSMRTreeTupleReference(ITypeTraits[] typeTraits) {
        super(typeTraits);
    }

    @Override
    protected int getNullFlagsBytes() {
        // +1.0 is for matter/antimatter bit.
        return (int) Math.ceil((fieldCount + 1.0) / 8.0);
    }

    @Override
    public boolean isAntimatter() {
        // Check if the leftmost bit is 0 or 1.
        final byte mask = (byte) (1 << 7);
        if ((buf.array()[tupleStartOff] & mask) != 0) {
            return true;
        }
        return false;
    }

    public int getTupleStart() {
        return tupleStartOff;
    }
}