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/*******************************************************************************
* Copyright (c) 2011, 2016 GitHub Inc. and others.
* 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
*
* Contributors:
* Kevin Sawicki (GitHub Inc.) - initial API and implementation
* François Rey - gracefully ignore linked resources
* Laurent Goubet <laurent.goubet@obeo.fr>
* Stefan Dirix <sdirix@eclipsesource.com>
*******************************************************************************/
package org.eclipse.egit.ui.internal.actions;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IResource;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.CommonUtils;
import org.eclipse.egit.ui.internal.CompareUtils;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.dialogs.CommitSelectDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.window.Window;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* Compare with previous revision action handler.
*/
public class CompareWithPreviousActionHandler extends RepositoryActionHandler {
/**
* @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*/
@Override
public Object execute(final ExecutionEvent event) throws ExecutionException {
final Repository repository = getRepository(true, event);
if (repository == null) {
return null;
}
final IResource[] resources = getSelectedResources(event);
if (resources != null && resources.length > 0) {
try {
IWorkbenchPage workBenchPage = HandlerUtil
.getActiveWorkbenchWindowChecked(event).getActivePage();
final RevCommit previous = getPreviousRevision(event,
resources);
if (previous != null) {
CompareUtils.compare(resources, repository, Constants.HEAD,
previous.getName(), true, workBenchPage);
} else {
showNotFoundDialog(event, resources);
}
} catch (Exception e) {
Activator.handleError(
UIText.CompareWithRefAction_errorOnSynchronize, e,
true);
}
}
return null;
}
@Override
public boolean isEnabled() {
IStructuredSelection selection = getSelection();
return super.isEnabled() && selection.size() == 1
&& selectionMapsToSingleRepository();
}
private RevCommit getPreviousRevision(final ExecutionEvent event,
final IResource[] resources) throws IOException {
final List<RevCommit> previousList = findPreviousCommits(
Arrays.asList(resources));
final AtomicReference<RevCommit> previous = new AtomicReference<>();
if (previousList.size() == 0) {
return null;
} else if (previousList.size() == 1)
previous.set(previousList.get(0));
else {
final List<RevCommit> commits = new ArrayList<>();
for (RevCommit pc : previousList)
commits.add(pc);
HandlerUtil.getActiveShell(event).getDisplay()
.syncExec(new Runnable() {
@Override
public void run() {
CommitSelectDialog dlg = new CommitSelectDialog(
HandlerUtil.getActiveShell(event), commits);
if (dlg.open() == Window.OK)
for (RevCommit pc : previousList)
if (pc.equals(dlg.getSelectedCommit())) {
previous.set(pc);
break;
}
}
});
}
return previous.get();
}
private void showNotFoundDialog(final ExecutionEvent event,
IResource[] resources) {
final String resourceNames = CommonUtils
.getResourceNames(Arrays.asList(resources));
final String message = MessageFormat
.format(UIText.CompareWithPreviousActionHandler_MessageRevisionNotFound,
resourceNames);
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
@Override
public void run() {
MessageDialog
.openWarning(
HandlerUtil.getActiveShell(event),
UIText.CompareWithPreviousActionHandler_TitleRevisionNotFound,
message);
}
});
}
}
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