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/*******************************************************************************
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
* Copyright (C) 2012, Robin Stocker <robin@nibor.org>
* Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch>
*
* 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
*******************************************************************************/
package org.eclipse.egit.ui.internal.history;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Collection;
import java.util.Objects;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
import org.eclipse.jgit.treewalk.filter.TreeFilter;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.progress.UIJob;
/**
* Content provider for {@link FileDiff} objects. The diffs are computed
* asynchronously in a background job.
*/
public class FileDiffContentProvider implements IStructuredContentProvider {
static final int INTERESTING_MARK_TREE_FILTER_INDEX = 0;
private FileDiff[] diff;
private TreeFilter markTreeFilter = TreeFilter.ALL;
private CommitFileDiffViewer viewer;
private boolean needsRecompute;
private FileDiffLoader loader;
private FileDiffInput currentInput;
@Override
public void inputChanged(final Viewer newViewer, final Object oldInput,
final Object newInput) {
cancel();
viewer = (CommitFileDiffViewer) newViewer;
if (newInput != null) {
currentInput = (FileDiffInput) newInput;
setInterestingPaths(currentInput.getInterestingPaths());
} else {
currentInput = null;
}
diff = null;
needsRecompute = true;
}
/**
* Set the paths which are interesting and should be highlighted in the view.
* @param interestingPaths
*/
void setInterestingPaths(Collection<String> interestingPaths) {
if (interestingPaths != null) {
this.markTreeFilter = PathFilterGroup.createFromStrings(interestingPaths);
} else {
this.markTreeFilter = TreeFilter.ALL;
}
needsRecompute = true;
}
@Override
public Object[] getElements(final Object inputElement) {
if (!needsRecompute) {
return diff != null ? diff : new Object[0];
}
needsRecompute = false;
FileDiffInput input = currentInput;
if (input == null) {
diff = null;
return new Object[0];
}
cancel();
FileDiffLoader job = new FileDiffLoader(input, markTreeFilter);
job.addJobChangeListener(new JobChangeAdapter() {
@Override
public void done(IJobChangeEvent event) {
if (!event.getResult().isOK()) {
return;
}
UIJob updater = new UpdateJob(MessageFormat.format(
UIText.FileDiffContentProvider_updatingFileDiffs,
input.getCommit().getName()), job);
updater.schedule();
}
});
job.setUser(false);
job.setSystem(true);
loader = job;
loader.schedule();
return new Object[0];
}
private void cancel() {
if (loader != null) {
loader.cancel();
loader = null;
}
}
@Override
public void dispose() {
cancel();
viewer = null;
diff = null;
currentInput = null;
}
private static class FileDiffLoader extends Job {
private FileDiff[] diffs;
private final FileDiffInput input;
private final TreeFilter filter;
public FileDiffLoader(FileDiffInput input, TreeFilter filter) {
super(MessageFormat.format(
UIText.FileDiffContentProvider_computingFileDiffs,
input.getCommit().getName()));
this.input = input;
this.filter = filter;
setRule(new TreeWalkSchedulingRule(input.getTreeWalk()));
}
@Override
protected IStatus run(IProgressMonitor monitor) {
try {
if (monitor.isCanceled()) {
return Status.CANCEL_STATUS;
}
diffs = FileDiff.compute(input.getRepository(),
input.getTreeWalk(),
input.getCommit(), monitor, filter);
} catch (IOException err) {
Activator.handleError(MessageFormat.format(
UIText.FileDiffContentProvider_errorGettingDifference,
input.getCommit().getId()), err, false);
}
if (monitor.isCanceled()) {
return Status.CANCEL_STATUS;
}
return Status.OK_STATUS;
}
public FileDiff[] getDiffs() {
return diffs;
}
}
private class UpdateJob extends UIJob {
FileDiffLoader loadJob;
public UpdateJob(String name, FileDiffLoader loadJob) {
super(name);
this.loadJob = loadJob;
}
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
Control control = viewer == null ? null : viewer.getControl();
if (control == null || control.isDisposed() || loader != loadJob) {
return Status.CANCEL_STATUS;
}
diff = loadJob.getDiffs();
viewer.refresh();
FileDiff interesting = getFirstInterestingElement();
if (interesting != null) {
if (currentInput.isSelectMarked()) {
viewer.setSelection(new StructuredSelection(interesting),
true);
} else {
viewer.reveal(interesting);
}
}
return Status.OK_STATUS;
}
private FileDiff getFirstInterestingElement() {
FileDiff[] diffs = diff;
if (diffs != null) {
for (FileDiff d : diffs) {
if (d.isMarked(INTERESTING_MARK_TREE_FILTER_INDEX)) {
return d;
}
}
}
return null;
}
}
/**
* Serializes all load jobs using the same tree walk. Tree walks are not
* thread safe.
*/
private static class TreeWalkSchedulingRule implements ISchedulingRule {
private final TreeWalk treeWalk;
public TreeWalkSchedulingRule(TreeWalk treeWalk) {
this.treeWalk = treeWalk;
}
@Override
public boolean contains(ISchedulingRule rule) {
if (rule instanceof TreeWalkSchedulingRule) {
return Objects.equals(treeWalk,
((TreeWalkSchedulingRule) rule).treeWalk);
}
return false;
}
@Override
public boolean isConflicting(ISchedulingRule rule) {
return contains(rule);
}
}
}
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