Java tutorial
/****************************************************************************** * Copyright (c) 2011 GitHub Inc. * 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 *****************************************************************************/ package org.eclipse.mylyn.internal.github.ui.pr; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.net.URISyntaxException; import java.text.MessageFormat; import org.eclipse.core.commands.ExecutionEvent; import org.eclipse.core.commands.ExecutionException; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.core.runtime.SubProgressMonitor; import org.eclipse.core.runtime.jobs.Job; import org.eclipse.egit.core.op.CreateLocalBranchOperation; import org.eclipse.egit.core.op.FetchOperation; import org.eclipse.egit.core.op.MergeOperation; import org.eclipse.egit.github.core.PullRequest; import org.eclipse.egit.ui.Activator; import org.eclipse.egit.ui.UIPreferences; import org.eclipse.egit.ui.internal.branch.BranchOperationUI; import org.eclipse.jgit.lib.Constants; import org.eclipse.jgit.lib.Ref; import org.eclipse.jgit.lib.Repository; import org.eclipse.jgit.revwalk.RevCommit; import org.eclipse.jgit.revwalk.RevWalk; import org.eclipse.jgit.transport.RemoteConfig; import org.eclipse.mylyn.internal.github.core.pr.PullRequestComposite; import org.eclipse.mylyn.internal.github.core.pr.PullRequestConnector; import org.eclipse.mylyn.internal.github.core.pr.PullRequestUtils; import org.eclipse.mylyn.internal.github.ui.GitHubUi; import org.eclipse.mylyn.internal.github.ui.TaskDataHandler; import org.eclipse.mylyn.tasks.core.data.TaskData; /** * Checkout pull request handler */ public class CheckoutPullRequestHandler extends TaskDataHandler { /** * ID */ public static final String ID = "org.eclipse.mylyn.github.ui.command.checkoutPullRequest"; //$NON-NLS-1$ /** * Create checkout pull request handler */ public CheckoutPullRequestHandler() { } private RevCommit getBase(Repository repo, PullRequest request) throws IOException { RevWalk walk = new RevWalk(repo); try { return walk.parseCommit(repo.resolve(request.getBase().getSha())); } finally { walk.release(); } } public Object execute(final ExecutionEvent event) throws ExecutionException { final TaskData data = getTaskData(event); if (data == null) return null; Job job = new Job(MessageFormat.format(Messages.CheckoutPullRequestHandler_JobName, data.getTaskId())) { protected IStatus run(IProgressMonitor monitor) { SubProgressMonitor sub; try { PullRequestComposite prComp = PullRequestConnector.getPullRequest(data); if (prComp == null) return Status.CANCEL_STATUS; PullRequest request = prComp.getRequest(); Repository repo = PullRequestUtils.getRepository(request); if (repo == null) return Status.CANCEL_STATUS; String branchName = PullRequestUtils.getBranchName(request); Ref branchRef = repo.getRef(branchName); RemoteConfig remote = null; String headBranch = null; monitor.beginTask("", 5); //$NON-NLS-1$ // Add remote if (!PullRequestUtils.isFromSameRepository(request)) { monitor.subTask(MessageFormat.format(Messages.CheckoutPullRequestHandler_TaskAddRemote, request.getHead().getRepo().getOwner().getLogin())); remote = PullRequestUtils.addRemote(repo, request); headBranch = PullRequestUtils.getHeadBranch(request); } else { remote = PullRequestUtils.getRemoteConfig(repo, Constants.DEFAULT_REMOTE_NAME); headBranch = request.getHead().getRef(); } monitor.worked(1); // Create topic branch starting at SHA-1 of base if (branchRef == null) { sub = new SubProgressMonitor(monitor, 1); sub.subTask(MessageFormat.format(Messages.CheckoutPullRequestHandler_TaskCreateBranch, branchName)); PullRequestUtils.configureTopicBranch(repo, request); new CreateLocalBranchOperation(repo, branchName, getBase(repo, request)).execute(sub); sub.done(); } else monitor.worked(1); // Checkout topic branch if (!PullRequestUtils.isCurrentBranch(branchName, repo)) { sub = new SubProgressMonitor(monitor, 1); sub.subTask(MessageFormat.format(Messages.CheckoutPullRequestHandler_TaskCheckoutBranch, branchName)); BranchOperationUI.checkout(repo, branchName).run(sub); sub.done(); } else monitor.worked(1); // Fetch from remote sub = new SubProgressMonitor(monitor, 1); sub.subTask(MessageFormat.format(Messages.CheckoutPullRequestHandler_TaskFetching, remote.getName())); new FetchOperation(repo, remote, Activator.getDefault().getPreferenceStore() .getInt(UIPreferences.REMOTE_CONNECTION_TIMEOUT), false).run(sub); sub.done(); // Merge head onto base sub = new SubProgressMonitor(monitor, 1); sub.subTask(MessageFormat.format(Messages.CheckoutPullRequestHandler_TaskMerging, headBranch)); new MergeOperation(repo, headBranch).execute(sub); sub.done(); monitor.done(); executeCallback(event); } catch (IOException e) { GitHubUi.logError(e); } catch (CoreException e) { GitHubUi.logError(e); } catch (URISyntaxException e) { GitHubUi.logError(e); } catch (InvocationTargetException e) { GitHubUi.logError(e); } return Status.OK_STATUS; } }; schedule(job, event); return null; } }