/*
* Copyright (C) 2011, Robin Stocker <robin@nibor.org>
* Copyright (C) 2012, Matthias Sohn <matthias.sohn@sap.com>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.lib;
import java.io.IOException;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.revwalk.RevWalkUtils;
import org.eclipse.jgit.revwalk.filter.RevFilter;
/**
* Status of a branch's relation to its remote-tracking branch.
*/
public class BranchTrackingStatus {
/**
* Compute the tracking status for the <code>branchName</code> in
* <code>repository</code>.
*
* @param repository
* the git repository to compute the status from
* @param branchName
* the local branch
* @return the tracking status, or null if it is not known
* @throws IOException
*/
public static BranchTrackingStatus of(Repository repository, String branchName)
throws IOException {
String shortBranchName = Repository.shortenRefName(branchName);
String fullBranchName = Constants.R_HEADS + shortBranchName;
BranchConfig branchConfig = new BranchConfig(repository.getConfig(),
shortBranchName);
String trackingBranch = branchConfig.getTrackingBranch();
if (trackingBranch == null)
return null;
Ref tracking = repository.getRef(trackingBranch);
if (tracking == null)
return null;
Ref local = repository.getRef(fullBranchName);
if (local == null)
return null;
RevWalk walk = new RevWalk(repository);
RevCommit localCommit = walk.parseCommit(local.getObjectId());
RevCommit trackingCommit = walk.parseCommit(tracking.getObjectId());
walk.setRevFilter(RevFilter.MERGE_BASE);
walk.markStart(localCommit);
walk.markStart(trackingCommit);
RevCommit mergeBase = walk.next();
walk.reset();
walk.setRevFilter(RevFilter.ALL);
int aheadCount = RevWalkUtils.count(walk, localCommit, mergeBase);
int behindCount = RevWalkUtils.count(walk, trackingCommit, mergeBase);
return new BranchTrackingStatus(trackingBranch, aheadCount, behindCount);
}
private final String remoteTrackingBranch;
private final int aheadCount;
private final int behindCount;
private BranchTrackingStatus(String remoteTrackingBranch, int aheadCount,
int behindCount) {
this.remoteTrackingBranch = remoteTrackingBranch;
this.aheadCount = aheadCount;
this.behindCount = behindCount;
}
/**
* @return full remote-tracking branch name
*/
public String getRemoteTrackingBranch() {
return remoteTrackingBranch;
}
/**
* @return number of commits that the local branch is ahead of the
* remote-tracking branch
*/
public int getAheadCount() {
return aheadCount;
}
/**
* @return number of commits that the local branch is behind of the
* remote-tracking branch
*/
public int getBehindCount() {
return behindCount;
}
}