393788: show parent commit of each patch set in review editor

Change-Id: I375bce95079c4eae6fbb21e26bc83dcd01fb85bf
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=393788
Signed-off-by: Nicholas Folk <Nicholas.folk@tasktop.com>

2 files changed, 110 insertions, 0 deletions

diff --git a/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/OpenParentCommitUiFactory.java b/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/OpenParentCommitUiFactory.java
new file mode 100644
index 000000000..825ea6d56
--- /dev/null
+++ b/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/OpenParentCommitUiFactory.java
@@ -0,0 +1,104 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Tasktop Technologies 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:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.gerrit.ui.factories;
+
+import java.io.IOException;
+
+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.Job;
+import org.eclipse.core.runtime.jobs.JobChangeAdapter;
+import org.eclipse.egit.ui.internal.commit.CommitEditor;
+import org.eclipse.egit.ui.internal.commit.RepositoryCommit;
+import org.eclipse.jgit.errors.AmbiguousObjectException;
+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.mylyn.internal.gerrit.core.egit.GerritToGitMapping;
+import org.eclipse.mylyn.internal.gerrit.ui.GerritUiPlugin;
+import org.eclipse.mylyn.reviews.core.model.IReviewItemSet;
+import org.eclipse.mylyn.reviews.ui.spi.factories.IUiContext;
+import org.eclipse.swt.widgets.Display;
+
+public class OpenParentCommitUiFactory extends OpenCommitUiFactory {
+
+	private final String commitId;
+
+	public OpenParentCommitUiFactory(IUiContext context, IReviewItemSet set, String commitId) {
+		super(context, set);
+		this.commitId = commitId;
+	}
+
+	@Override
+	public void execute() {
+		GerritToGitMapping mapping = getGitRepository(true);
+		if (mapping != null) {
+			final ParentCommitJob job = new ParentCommitJob(Messages.OpenCommitUiFactory_Opening_Commit_Viewer,
+					mapping.getRepository(), commitId);
+			job.schedule();
+			job.addJobChangeListener(new JobChangeAdapter() {
+				@Override
+				public void done(IJobChangeEvent event) {
+					Display.getDefault().asyncExec(new Runnable() {
+						@Override
+						public void run() {
+							CommitEditor.openQuiet(job.getCommit());
+						}
+					});
+				}
+			});
+		}
+
+	}
+
+	public static class ParentCommitJob extends Job {
+
+		private final Repository repository;
+
+		private RepositoryCommit commit;
+
+		private final String commitId;
+
+		public ParentCommitJob(String name, Repository repository, String commitId) {
+			super(name);
+			this.repository = repository;
+			this.commitId = commitId;
+		}
+
+		@Override
+		protected IStatus run(IProgressMonitor monitor) {
+			try {
+				RevCommit revCommit = getRevCommit();
+				commit = new RepositoryCommit(repository, revCommit);
+			} catch (Exception e) {
+				return new Status(IStatus.ERROR, GerritUiPlugin.PLUGIN_ID, "Patch set retrieval failed", e); //$NON-NLS-1$
+			}
+			return Status.OK_STATUS;
+		}
+
+		public RepositoryCommit getCommit() {
+			return commit;
+		}
+
+		private RevCommit getRevCommit() throws AmbiguousObjectException, IOException {
+			ObjectId ref = repository.resolve(commitId);
+			RevWalk walker = new RevWalk(repository);
+			RevCommit targetCommit = walker.parseCommit(ref);
+			return targetCommit;
+
+		}
+
+	}
+}
diff --git a/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/PatchSetUiFactoryProvider.java b/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/PatchSetUiFactoryProvider.java
index 94ca7597b..5c418a34e 100644
--- a/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/PatchSetUiFactoryProvider.java
+++ b/org.eclipse.mylyn.gerrit.ui/src/org/eclipse/mylyn/internal/gerrit/ui/factories/PatchSetUiFactoryProvider.java
@@ -45,6 +45,12 @@ public class PatchSetUiFactoryProvider extends AbstractReviewItemSetUiFactoryPro
 	}
 
 	@Override
+	public AbstractUiFactory<IReviewItemSet> getOpenParentCommitFactory(IUiContext context, IReviewItemSet set,
+			String commitId) {
+		return new OpenParentCommitUiFactory(context, set, commitId);
+	}
+
+	@Override
 	public AbstractUiFactory<IReviewItemSet> getOpenFileFactory(IUiContext context, IReviewItemSet set, IFileItem item) {
 		return new OpenFileUiFactory(context, set, item);
 	}