/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Kowari Metadata Store.
*
* The Initial Developer of the Original Code is Plugged In Software Pty
* Ltd (http://www.pisoftware.com, mailto:info@pisoftware.com). Portions
* created by Plugged In Software Pty Ltd are Copyright (C) 2001,2002
* Plugged In Software Pty Ltd. All Rights Reserved.
*
* Contributor(s): N/A.
*
* [NOTE: The text of this Exhibit A may differ slightly from the text
* of the notices in the Source Code files of the Original Code. You
* should use the text of this Exhibit A rather than the text found in the
* Original Code Source Code for Your Modifications.]
*
*/
package org.mulgara.resolver;
// Java 2 standard packages
import java.io.*;
import java.util.*;
// Third party packages
import org.apache.log4j.Logger;
import org.jrdf.graph.*;
// Local packages
import org.mulgara.resolver.spi.DatabaseMetadata;
import org.mulgara.resolver.spi.SingletonStatements;
import org.mulgara.resolver.spi.SystemResolver;
/**
* An {@link Operation} that implements node preallocation.
*
* @created 2004-11-24
*
* @author <a href="mailto:andrae@netymon.com">Andrae Muys</a>
*
* @version $Revision: $
*
* @modified $Date: $ by $Author: $
*
* @maintenanceAuthor $Author: $
*
* @copyright ©2004 <a href="http://www.tucanatech.com/">Tucana
* Technology, Inc</a>
*
* @licence <a href="{@docRoot}/../../LICENCE">Mozilla Public License v1.1</a>
*/
class PreallocateOperation implements Operation
{
/** Logger. */
private static final Logger logger =
Logger.getLogger(PreallocateOperation.class.getName());
/**
* The node to be preallocated
*/
private final Node node;
/**
* The localized node.
*/
private long localNode;
PreallocateOperation(Node node) {
assert node != null;
this.node = node;
}
public void execute(OperationContext operationContext,
SystemResolver systemResolver,
DatabaseMetadata metadata) throws Exception {
this.localNode = systemResolver.localizePersistent(node);
// Create a statement linking the node to the graph so it's never reaped
systemResolver.modifyModel(metadata.getPreallocationModelNode(),
new SingletonStatements(metadata.getPreallocationSubjectNode(),
metadata.getPreallocationPredicateNode(), localNode), true);
}
public long getResult() {
return localNode;
}
public boolean isWriteOperation() {
return true;
}
}