/**
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 Nov 5, 2007
*/
package com.bigdata.rdf.inf;
import java.util.Map;
import com.bigdata.rdf.changesets.IChangeLog;
import com.bigdata.rdf.changesets.StatementWriter;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.model.BigdataBNode;
import com.bigdata.rdf.spo.ISPO;
import com.bigdata.rdf.spo.SPO;
import com.bigdata.rdf.store.AbstractTripleStore;
import com.bigdata.relation.accesspath.AbstractElementBuffer.DeleteBuffer;
import com.bigdata.relation.rule.eval.AbstractSolutionBuffer.DeleteSolutionBuffer;
import com.bigdata.striterator.ChunkedArrayIterator;
/**
* A buffer for {@link SPO}s which causes the corresponding statements (and
* their {@link Justification}s) be retracted from the database when it is
* {@link #flush()}ed.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*
* @deprecated by {@link DeleteBuffer} and {@link DeleteSolutionBuffer} and the
* changes to how truth maintenance is handled (rule rewrites).
*/
public class SPORetractionBuffer extends AbstractSPOBuffer {
private final AbstractTripleStore store;
private final boolean computeClosureForStatementIdentifiers;
/**
* Optional change log for change notification.
*/
protected final IChangeLog changeLog;
/**
* @param store
* The database from which the statement will be removed when the
* buffer is {@link #flush()}ed.
* @param capacity
* The capacity of the retraction buffer.
* @param computeClosureForStatementIdentifiers
* See
* {@link AbstractTripleStore#removeStatements(com.bigdata.rdf.spo.ISPOIterator, boolean)}
*/
public SPORetractionBuffer(AbstractTripleStore store, int capacity,
boolean computeClosureForStatementIdentifiers) {
this(store, capacity, computeClosureForStatementIdentifiers,
null/* changeLog */);
}
/**
* @param store
* The database from which the statement will be removed when the
* buffer is {@link #flush()}ed.
* @param capacity
* The capacity of the retraction buffer.
* @param computeClosureForStatementIdentifiers
* See
* {@link AbstractTripleStore#removeStatements(com.bigdata.rdf.spo.ISPOIterator, boolean)}
* @param changeLog
* optional change log for change notification
*/
public SPORetractionBuffer(AbstractTripleStore store, int capacity,
boolean computeClosureForStatementIdentifiers,
final IChangeLog changeLog) {
super(store, null/*filter*/, capacity);
if (store == null)
throw new IllegalArgumentException();
this.store = store;
this.computeClosureForStatementIdentifiers = computeClosureForStatementIdentifiers;
this.changeLog = changeLog;
}
public int flush() {
if (isEmpty()) return 0;
final long n;
if (changeLog == null) {
n = store.removeStatements(new ChunkedArrayIterator<ISPO>(numStmts,stmts,
null/*keyOrder*/), computeClosureForStatementIdentifiers);
} else {
n = StatementWriter.removeStatements(
store,
new ChunkedArrayIterator<ISPO>(
numStmts,stmts,null/*keyOrder*/),
computeClosureForStatementIdentifiers,
changeLog);
}
// reset the counter.
numStmts = 0;
// FIXME Note: being truncated to int, but whole class is deprecated.
return (int) Math.min(Integer.MAX_VALUE, n);
}
}