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/*
* Copyright (c) 2004 - 2012 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.spi.common.revision;
import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.branch.CDOBranchVersion;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDORevisionCache;
import org.eclipse.emf.cdo.common.revision.CDORevisionManager;
import org.eclipse.emf.ecore.EClass;
/**
* A synthetic revision that represents the initial period of an object in a {@link CDOBranch branch} when the object is
* still associated with a revision from one of the baseline branches. It always has {@link #getVersion() version}
* {@link CDOBranchVersion#UNSPECIFIED_VERSION zero} and can only appear in branches below the
* {@link CDOBranch#isMainBranch() main} branch.
* <p>
* Synthetic revisions are used for two slightly different purposes:
* <ol>
* <li>For {@link CDORevisionCache cache} optimization.
* <li>As a persistent "detach marker" indicating that the first modification of an object in a branch is its deletion.
* </ol>
* <p>
* Instances of this marker revision are not supposed to be exposed outside of a revision {@link CDORevisionManager
* manager}. They are mainly used in the communication between a revision manager and its associated revision
* {@link InternalCDORevisionManager.RevisionLoader loader}.
*
* @author Eike Stepper
* @since 3.0
*/
public abstract class SyntheticCDORevision extends StubCDORevision
{
private CDOID id;
private CDOBranch branch;
public SyntheticCDORevision(EClass eClass, CDOID id, CDOBranch branch)
{
super(eClass);
this.id = id;
this.branch = branch;
}
@Override
public CDOID getID()
{
return id;
}
@Override
public CDOBranch getBranch()
{
return branch;
}
@Override
public void freeze()
{
// Do nothing
}
}
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