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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.RIGHT;
import static org.eclipse.jgit.lib.FileMode.MISSING;
import static org.eclipse.jgit.lib.FileMode.TREE;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.UIText;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
/**
* Git cache representation in EGit Change Set
*/
public class GitModelCache extends GitModelObjectContainer {
/**
* NTH of {@link DirCacheIterator}
*/
protected int dirCacheIteratorNth;
private final FileModelFactory fileFactory;
private final Map<String, GitModelCacheTree> cacheTreeMap;
private static final int BASE_NTH = 0;
private static final int REMOTE_NTH = 1;
/**
* This interface enables creating proper instance of {@link GitModelBlob}
* for cached and working files. In case of working files the left side
* content of Compare View is loaded from local hard drive.
*/
protected interface FileModelFactory {
/**
* Creates proper instance of {@link GitModelBlob} for cache and working
* tree model representation
*
* @param parent
* parent object
* @param commit
* last {@link RevCommit} in repository
* @param repoId
* {@link ObjectId} of blob in repository
* @param cacheId
* {@link ObjectId} of blob in cache
* @param name
* of blob
* @return instance of {@link GitModelBlob}
* @throws IOException
*/
GitModelBlob createFileModel(GitModelObjectContainer parent,
RevCommit commit, ObjectId repoId, ObjectId cacheId, String name)
throws IOException;
}
/**
* Constructs model node that represents current status of Git cache.
*
* @param parent
* parent object
* @param baseCommit
* last {@link RevCommit} in repository
* @throws IOException
*/
public GitModelCache(GitModelObject parent, RevCommit baseCommit)
throws IOException {
this(parent, baseCommit, new FileModelFactory() {
public GitModelBlob createFileModel(
GitModelObjectContainer modelParent, RevCommit commit,
ObjectId repoId, ObjectId cacheId, String name)
throws IOException {
return new GitModelCacheFile(modelParent, commit, repoId,
cacheId, name);
}
});
}
/**
* @param parent
* @param baseCommit
* @param fileFactory
* @throws IOException
*/
protected GitModelCache(GitModelObject parent, RevCommit baseCommit,
FileModelFactory fileFactory) throws IOException {
super(parent, baseCommit, RIGHT);
this.fileFactory = fileFactory;
cacheTreeMap = new HashMap<String, GitModelCacheTree>();
}
@Override
public String getName() {
return UIText.GitModelIndex_index;
}
protected GitModelObject[] getChildrenImpl() {
List<GitModelObject> result = new ArrayList<GitModelObject>();
try {
TreeWalk tw = createAndConfigureTreeWalk();
while (tw.next()) {
GitModelObject entry = extractFromCache(tw);
if (entry == null)
continue;
result.add(entry);
}
} catch (IOException e) {
Activator.logError(e.getMessage(), e);
}
return result.toArray(new GitModelObject[result.size()]);
}
/**
* Creates and configures {@link TreeWalk} instance for
* {@link GitModelCache#getChildrenImpl()} method. It is IMPORTANT to add
* tree that will be used as a base as first, remote tree should be added as
* second; {@link GitModelCache#dirCacheIteratorNth} should be set with
* value of NTH that corresponds with {@link DirCacheIterator}.
*
* @return configured instance of TreeW
* @throws IOException
*/
protected TreeWalk createAndConfigureTreeWalk() throws IOException {
TreeWalk tw = createTreeWalk();
tw.setRecursive(true);
Repository repo = getRepository();
DirCache index = repo.readDirCache();
ObjectId headId = repo.getRef(Constants.HEAD).getObjectId();
tw.addTree(new RevWalk(repo).parseTree(headId));
tw.addTree(new DirCacheIterator(index));
dirCacheIteratorNth = 1;
return tw;
}
private GitModelObject extractFromCache(TreeWalk tw) throws IOException {
DirCacheIterator cacheIterator = tw.getTree(dirCacheIteratorNth,
DirCacheIterator.class);
if (cacheIterator == null)
return null;
DirCacheEntry cacheEntry = cacheIterator.getDirCacheEntry();
if (cacheEntry == null)
return null;
if (shouldIncludeEntry(tw)) {
String path = new String(tw.getRawPath());
ObjectId repoId = tw.getObjectId(BASE_NTH);
ObjectId cacheId = tw.getObjectId(REMOTE_NTH);
if (path.split("/").length > 1) //$NON-NLS-1$
return handleCacheTree(repoId, cacheId, path);
return fileFactory.createFileModel(this, baseCommit, repoId,
cacheId, path);
}
return null;
}
private boolean shouldIncludeEntry(TreeWalk tw) {
final int mHead = tw.getRawMode(BASE_NTH);
final int mCache = tw.getRawMode(REMOTE_NTH);
return mHead == MISSING.getBits() // initial add to cache
|| mCache == MISSING.getBits() // removed from cache
|| (mHead != mCache || (mCache != TREE.getBits() && !tw
.idEqual(BASE_NTH, REMOTE_NTH))); // modified
}
private GitModelObject handleCacheTree(ObjectId repoId, ObjectId cacheId,
String path) throws IOException {
String pathKey = path.split("/")[0]; //$NON-NLS-1$
GitModelCacheTree cacheTree = cacheTreeMap.get(pathKey);
if (cacheTree == null) {
cacheTree = new GitModelCacheTree(this, baseCommit, repoId,
cacheId, pathKey, fileFactory);
cacheTreeMap.put(pathKey, cacheTree);
}
cacheTree.addChild(repoId, cacheId,
path.substring(path.indexOf('/') + 1));
return cacheTree;
}
}
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