org.eclipse.jgit.merge.ThreeWayMerger Maven / Gradle / Ivy
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* Copyright (C) 2009, Google Inc.
* and other copyright owners as documented in the project's IP log.
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* This program and the accompanying materials are made available
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* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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package org.eclipse.jgit.merge;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
/** A merge of 2 trees, using a common base ancestor tree. */
public abstract class ThreeWayMerger extends Merger {
private RevTree baseTree;
/**
* Create a new merge instance for a repository.
*
* @param local
* the repository this merger will read and write data on.
*/
protected ThreeWayMerger(final Repository local) {
super(local);
}
/**
* Create a new merge instance for a repository.
*
* @param local
* the repository this merger will read and write data on.
* @param inCore
* perform the merge in core with no working folder involved
*/
protected ThreeWayMerger(final Repository local, boolean inCore) {
this(local);
}
/**
* Set the common ancestor tree.
*
* @param id
* common base treeish; null to automatically compute the common
* base from the input commits during
* {@link #merge(AnyObjectId...)}.
* @throws IncorrectObjectTypeException
* the object is not a treeish.
* @throws MissingObjectException
* the object does not exist.
* @throws IOException
* the object could not be read.
*/
public void setBase(final AnyObjectId id) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
if (id != null) {
baseTree = walk.parseTree(id);
} else {
baseTree = null;
}
}
@Override
public boolean merge(final AnyObjectId... tips) throws IOException {
if (tips.length != 2)
return false;
return super.merge(tips);
}
/**
* Create an iterator to walk the merge base.
*
* @return an iterator over the caller-specified merge base, or the natural
* merge base of the two input commits.
* @throws IOException
*/
protected AbstractTreeIterator mergeBase() throws IOException {
if (baseTree != null)
return openTree(baseTree);
return mergeBase(0, 1);
}
}