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/*******************************************************************************
* Copyright (C) 2010, Dariusz Luksza <dariusz@luksza.org>
*
* 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
*******************************************************************************/
package org.eclipse.egit.ui.internal.synchronize.model;
import static org.eclipse.compare.structuremergeviewer.Differencer.LEFT;
import static org.eclipse.compare.structuremergeviewer.Differencer.RIGHT;
import static org.eclipse.jgit.lib.ObjectId.zeroId;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.egit.core.Activator;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.treewalk.TreeWalk;
/**
* Representation of Git tree's in Git ChangeSet model
*/
public class GitModelTree extends GitModelCommit {
private final String name;
private final ObjectId baseId;
private final ObjectId remoteId;
private final ObjectId ancestorId;
private GitModelObject[] children;
private IPath location;
/**
* @param parent
* parent of this tree
* @param commit
* commit associated with this tree
* @param ancestorId
* id of common ancestor tree for this on
* @param baseId
* id of base tree
* @param remoteId
* this tree id
* @param name
* name resource associated with this tree
* @throws IOException
*/
public GitModelTree(GitModelCommit parent, RevCommit commit,
ObjectId ancestorId, ObjectId baseId, ObjectId remoteId, String name)
throws IOException {
// only direction is important for us, therefore we mask rest of bits in kind
super(parent, commit, parent.getKind() & (LEFT | RIGHT));
this.name = name;
this.baseId = baseId;
this.remoteId = remoteId;
this.ancestorId = ancestorId;
}
@Override
public GitModelObject[] getChildren() {
if (children == null)
getChildrenImpl();
return children;
}
@Override
public String getName() {
return name;
}
@Override
public IProject[] getProjects() {
return getParent().getProjects();
}
/**
* Return id of tree that should be used as a base variant in
* three-way-compare.
*
* @return base id
*/
public ObjectId getBaseId() {
return baseId;
}
/**
* Returns id of tree that should be used as a remote in three-way-compare
*
* @return object id
*/
public ObjectId getRemoteId() {
return remoteId;
}
@Override
public IPath getLocation() {
if (location == null)
location = getParent().getLocation().append(name);
return location;
}
@Override
protected ObjectId getBaseObjectId() {
return baseId;
}
@Override
protected ObjectId getRemoteObjectId() {
return remoteId;
}
private void getChildrenImpl() {
List<GitModelObject> result = new ArrayList<GitModelObject>();
try {
TreeWalk tw = createTreeWalk();
int remoteNth = tw.addTree(remoteId);
int baseNth = -1;
if (!baseId.equals(zeroId()))
baseNth = tw.addTree(baseId);
int ancestorNth = -1;
if (!ancestorId.equals(zeroId()))
ancestorNth = tw.addTree(ancestorId);
while (tw.next()) {
GitModelObject obj = createChildren(tw, ancestorNth, baseNth,
remoteNth);
if (obj != null)
result.add(obj);
}
} catch (IOException e) {
Activator.logError(e.getMessage(), e);
}
children = result.toArray(new GitModelObject[result.size()]);
}
private GitModelObject createChildren(TreeWalk tw, int ancestorNth,
int baseNth, int remoteNth) throws IOException {
ObjectId objRemoteId = tw.getObjectId(remoteNth);
if (objRemoteId.equals(zeroId()))
return null;
String objName = tw.getNameString();
ObjectId objBaseId = baseNth != -1 ? tw.getObjectId(baseNth) : zeroId();
ObjectId objAncestorId = ancestorNth != -1 ? tw
.getObjectId(ancestorNth) : zeroId();
int objectType = tw.getFileMode(remoteNth).getObjectType();
if (objectType == Constants.OBJ_BLOB)
return new GitModelBlob(this, getRemoteCommit(), objAncestorId,
objBaseId, objRemoteId, objName);
else if (objectType == Constants.OBJ_TREE)
return new GitModelTree(this, getRemoteCommit(), objAncestorId,
objBaseId, objRemoteId, objName);
return null;
}
}
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