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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.branch;
import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.common.branch.CDOBranchPointRange;
import org.eclipse.emf.cdo.common.branch.CDOBranchVersion;
import org.eclipse.emf.cdo.common.util.CDOCommonUtil;
import org.eclipse.emf.cdo.internal.common.branch.CDOBranchManagerImpl;
import org.eclipse.emf.cdo.internal.common.branch.CDOBranchPointRangeImpl;
import org.eclipse.net4j.util.ObjectUtil;
import java.util.ArrayList;
import java.util.List;
/**
* @author Eike Stepper
* @since 3.0
*/
public final class CDOBranchUtil
{
private CDOBranchUtil()
{
}
public static InternalCDOBranchManager createBranchManager()
{
return new CDOBranchManagerImpl();
}
public static CDOBranchPointRange createRange(CDOBranchPoint startPoint, CDOBranchPoint endPoint)
{
return new CDOBranchPointRangeImpl(startPoint, endPoint);
}
public static CDOBranchPoint copyBranchPoint(CDOBranchPoint source)
{
return source.getBranch().getPoint(source.getTimeStamp());
}
public static CDOBranchVersion copyBranchVersion(CDOBranchVersion source)
{
return source.getBranch().getVersion(source.getVersion());
}
public static boolean isContainedBy(CDOBranchPoint contained, CDOBranchPoint container)
{
CDOBranch containerBranch = container.getBranch();
if (ObjectUtil.equals(containerBranch, contained.getBranch()))
{
return CDOCommonUtil.compareTimeStamps(contained.getTimeStamp(), container.getTimeStamp()) <= 0;
}
if (containerBranch == null)
{
return false;
}
return isContainedBy(contained, containerBranch.getBase());
}
public static CDOBranchPoint getAncestor(CDOBranchPoint point1, CDOBranchPoint point2)
{
if (point1.getBranch() == null)
{
// Must be the main branch base
return point1;
}
if (point2.getBranch() == null)
{
// Must be the main branch base
return point2;
}
CDOBranchPoint[] path1 = getPath(point1);
CDOBranchPoint[] path2 = getPath(point2);
for (CDOBranchPoint pathPoint1 : path1)
{
for (CDOBranchPoint pathPoint2 : path2)
{
if (ObjectUtil.equals(pathPoint1.getBranch(), pathPoint2.getBranch()))
{
if (CDOCommonUtil.compareTimeStamps(pathPoint1.getTimeStamp(), pathPoint2.getTimeStamp()) < 0)
{
return pathPoint1;
}
return pathPoint2;
}
}
}
// Can not happen because any two branches meet on the main branch
return null;
}
public static CDOBranchPoint[] getPath(CDOBranchPoint point)
{
List<CDOBranchPoint> result = new ArrayList<CDOBranchPoint>();
getPath(point, result);
return result.toArray(new CDOBranchPoint[result.size()]);
}
private static void getPath(CDOBranchPoint point, List<CDOBranchPoint> result)
{
CDOBranch branch = point.getBranch();
if (branch != null)
{
result.add(point);
getPath(branch.getBase(), result);
}
}
}
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