/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program 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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Dec 12, 2006
*/
package com.bigdata.btree;
/**
* A key-value pair used to facilitate some iterator constructs.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class Tuple<E> extends AbstractTuple<E> {
// /**
// * This is used to lazily obtain the {@link ITupleSerializer} since it often
// * can not be immediately materialized in the context in which
// * {@link Tuple#Tuple(AbstractBTree, int)} is invoked.
// */
// private final WeakReference<AbstractBTree> btreeRef;
/**
*
* @param btree
* @param flags
*/
public Tuple(final AbstractBTree btree, final int flags) {
super(flags);
if (btree == null)
throw new IllegalArgumentException();
assert btree.getIndexMetadata() != null;
assert btree.getIndexMetadata().getTupleSerializer() != null;
tupleSer = btree.getIndexMetadata().getTupleSerializer();
// this.btreeRef = new WeakReference<AbstractBTree>(btree);
}
public int getSourceIndex() {
return 0;
}
// /**
// * This is lazily resolved from a {@link WeakReference} to the
// * {@link AbstractBTree}. It is a runtime error if the {@link AbstractBTree}
// * reference has been cleared, but then you should not be using a
// * {@link Tuple} instance after the {@link AbstractBTree} for which it was
// * created has been cleared.
// */
// public ITupleSerializer getTupleSerializer() {
//
// if (tupleSer == null) {
//
// synchronized (this) {
//
// final AbstractBTree btree = btreeRef.get();
//
// if (btree == null) {
//
// throw new AssertionError("Reference cleared");
//
// }
//
// tupleSer = btree.getIndexMetadata().getTupleSerializer();
//
// }
//
// }
//
// return tupleSer;
//
// }
// // used by double-checked locking pattern.
// private volatile ITupleSerializer tupleSer = null;
private final ITupleSerializer tupleSer;
public ITupleSerializer getTupleSerializer() {
return tupleSer;
}
}