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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.common.id;
import org.eclipse.net4j.util.UUIDGenerator;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.util.EcoreUtil;
/**
* Generates {@link CDOID IDs}.
*
* @author Eike Stepper
* @since 4.1
*/
public interface CDOIDGenerator
{
/**
* Generates {@link CDOID#NULL NULL} values.
*/
public static final CDOIDGenerator NULL = new CDOIDGenerator()
{
public CDOID generateCDOID(EObject object)
{
return CDOID.NULL;
}
public void reset()
{
// Do nothing
}
};
/**
* Generates {@link EcoreUtil#generateUUID(byte[]) UUID} values.
*/
public static final CDOIDGenerator UUID = new CDOIDGenerator()
{
public CDOID generateCDOID(EObject object)
{
byte[] bytes = new byte[16];
UUIDGenerator.DEFAULT.generate(bytes);
return CDOIDUtil.createUUID(bytes);
}
public void reset()
{
// Do nothing
}
};
/**
* Generates a {@link CDOID}.
*
* @param object
* the object to generate a new CDOID for if available, <code>null</code> otherwise.
*/
public CDOID generateCDOID(EObject object);
/**
* Called at the end of a commit operation to give this ID generator a chance to reset its sequence of IDs.
*/
public void reset();
}
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