/*******************************************************************************
* Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.com>
*
* 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.history.command;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.branch.BranchOperationUI;
import org.eclipse.egit.ui.internal.dialogs.BranchSelectionDialog;
import org.eclipse.egit.ui.internal.history.GitHistoryPage;
import org.eclipse.egit.ui.internal.repository.tree.RefNode;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.window.Window;
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.swt.SWT;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* Check out of a commit.
*/
public class CheckoutCommitHandler extends AbstractHistoryCommandHandler {
public Object execute(ExecutionEvent event) throws ExecutionException {
ObjectId commitId = getSelectedCommitId(event);
Repository repo = getRepository(event);
final BranchOperationUI op;
List<RefNode> nodes = getRefNodes(commitId, repo, Constants.R_HEADS,
Constants.R_REMOTES);
Collections.sort(nodes);
if (nodes.isEmpty())
op = BranchOperationUI.checkout(repo, commitId.name());
else if (nodes.size() == 1)
op = BranchOperationUI.checkout(repo, nodes.get(0).getObject().getName());
else {
BranchSelectionDialog<RefNode> dlg = new BranchSelectionDialog<RefNode>(
HandlerUtil.getActiveShellChecked(event), nodes,
UIText.CheckoutHandler_SelectBranchTitle,
UIText.CheckoutHandler_SelectBranchMessage, SWT.SINGLE);
if (dlg.open() == Window.OK) {
op = BranchOperationUI.checkout(repo, dlg.getSelectedNode()
.getObject().getName());
} else {
op = null;
}
}
if (op == null)
return null;
op.start();
return null;
}
@Override
public boolean isEnabled() {
GitHistoryPage page = getPage();
if (page == null)
return false;
IStructuredSelection sel = getSelection(page);
return sel.size() == 1 && sel.getFirstElement() instanceof RevCommit;
}
}