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package org.netbeans.lib.profiler.heap;

import java.util.AbstractList;


/**
 *
 * @author Tomas Hurka
 */
abstract class AbstractObjectArrayLazyList<T> extends AbstractList<T> {
    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    private final HprofByteBuffer dumpBuffer;
    private final HprofHeap heap;
    private final int idSize;
    private final int length;
    private final long offset;

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    AbstractObjectArrayLazyList(HprofHeap h, HprofByteBuffer buf, int len, long off) {
        heap = h;
        dumpBuffer = buf;
        length = len;
        offset = off;
        idSize = dumpBuffer.getIDSize();
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    protected Instance getInstance(int index) {
        return heap.getInstanceByID(dumpBuffer.getID(offset + ((long)index * (long)idSize)));
    }

    protected long getInstanceID(int index) {
        return dumpBuffer.getID(offset + ((long)index * (long)idSize));
    }

    public int size() {
        return length;
    }
}