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/*
* Copyright (C) 2011, Robin Stocker <robin@nibor.org>
* Copyright (C) 2012, Matthias Sohn <matthias.sohn@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
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 java.io.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.exactRef(trackingBranch);
if (tracking == null)
return null;
Ref local = repository.exactRef(fullBranchName);
if (local == null)
return null;
try (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;
}
/**
* Get full remote-tracking branch name
*
* @return full remote-tracking branch name
*/
public String getRemoteTrackingBranch() {
return remoteTrackingBranch;
}
/**
* Get number of commits that the local branch is ahead of the
* remote-tracking branch
*
* @return number of commits that the local branch is ahead of the
* remote-tracking branch
*/
public int getAheadCount() {
return aheadCount;
}
/**
* Get number of commits that the local branch is behind of the
* remote-tracking branch
*
* @return number of commits that the local branch is behind of the
* remote-tracking branch
*/
public int getBehindCount() {
return behindCount;
}
}
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