| /* |
| * Copyright (c) 2010-2013 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.cdo.spi.common.branch.InternalCDOBranch; |
| |
| 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 InternalCDOBranch branch; |
| |
| public SyntheticCDORevision(EClass eClass, CDOID id, CDOBranch branch) |
| { |
| super(eClass); |
| this.id = id; |
| this.branch = (InternalCDOBranch)branch; |
| } |
| |
| @Override |
| public CDOID getID() |
| { |
| return id; |
| } |
| |
| @Override |
| public InternalCDOBranch getBranch() |
| { |
| return branch; |
| } |
| |
| @Override |
| public void freeze() |
| { |
| // Do nothing |
| } |
| } |