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/*******************************************************************************
* Copyright (C) 2008, 2015 Shawn O. Pearce <spearce@spearce.org>
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Tobias Baumann <tobbaumann@gmail.com> - Bug 475836
*******************************************************************************/
package org.eclipse.egit.ui.internal.history;
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.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revplot.PlotWalk;
import org.eclipse.jgit.revwalk.RevCommit;
class SWTWalk extends PlotWalk {
private final Repository repo;
private Ref head;
private boolean headInitialized;
SWTWalk(final Repository repo) {
super(repo);
this.repo = repo;
}
Repository getRepository() {
return repo;
}
@Override
protected void reset(int retainFlags) {
headInitialized = false;
head = null;
super.reset(retainFlags);
}
@Override
public RevCommit next() throws MissingObjectException,
IncorrectObjectTypeException, IOException {
if (!headInitialized) {
head = determineHead();
headInitialized = true;
}
return super.next();
}
/**
* Retrieves the HEAD ref if it is symbolic.
*
* @return the Ref, or {@code null} if HEAD is not a symbolic Ref
* @throws IOException
* if the head cannot be read
*/
public Ref getHead() throws IOException {
if (!headInitialized) {
head = determineHead();
headInitialized = true;
}
return head;
}
@Override
protected RevCommit createCommit(final AnyObjectId id) {
return new SWTCommit(id, this);
}
private Ref determineHead() throws IOException {
Ref h = repo.exactRef(Constants.HEAD);
if (h != null && h.isSymbolic()) {
return h;
}
return null;
}
}
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