org.eclipse.egit.ui.internal.history.command.MergeHandler.java Source code

Introduction

Here is the source code for org.eclipse.egit.ui.internal.history.command.MergeHandler.java

Source

/*******************************************************************************
 * Copyright (c) 2010 SAP AG.
 * 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:
 *    Christian Halstrick (SAP AG) - initial implementation
 *    Mathias Kinzler (SAP AG) - initial implementation
 *    Robin Rosenberg - Adoption for the history menu
 *******************************************************************************/

package org.eclipse.egit.ui.internal.history.command;

import java.io.IOException;
import java.util.List;

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.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.egit.core.op.MergeOperation;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.dialogs.BranchSelectionDialog;
import org.eclipse.egit.ui.internal.merge.MergeResultDialog;
import org.eclipse.egit.ui.internal.repository.tree.RefNode;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * Executes the Merge
 */
public class MergeHandler extends AbstractHistoryCommandHandler {
    public Object execute(ExecutionEvent event) throws ExecutionException {
        RevCommit commit = (RevCommit) getSelection(getPage()).getFirstElement();
        final Repository repository = getRepository(event);
        if (repository == null)
            return null;

        if (!canMerge(repository))
            return null;

        List<RefNode> nodes = getRefNodes(commit, repository, Constants.R_REFS);
        String refName;
        if (nodes.isEmpty())
            refName = commit.getName();
        else if (nodes.size() == 1)
            refName = nodes.get(0).getObject().getName();
        else {
            BranchSelectionDialog<RefNode> dlg = new BranchSelectionDialog<RefNode>(
                    HandlerUtil.getActiveShellChecked(event), nodes, UIText.MergeHandler_SelectBranchTitle,
                    UIText.MergeHandler_SelectBranchMessage, SWT.SINGLE);
            if (dlg.open() == Window.OK)
                refName = dlg.getSelectedNode().getObject().getName();
            else
                return null;
        }
        String jobname = NLS.bind(UIText.MergeAction_JobNameMerge, refName);
        final MergeOperation op = new MergeOperation(repository, refName);
        Job job = new Job(jobname) {
            @Override
            protected IStatus run(IProgressMonitor monitor) {
                try {
                    op.execute(monitor);
                } catch (final CoreException e) {
                    return e.getStatus();
                }
                return Status.OK_STATUS;
            }
        };
        job.setUser(true);
        job.setRule(op.getSchedulingRule());
        job.addJobChangeListener(new JobChangeAdapter() {
            @Override
            public void done(IJobChangeEvent cevent) {
                IStatus result = cevent.getJob().getResult();
                if (result.getSeverity() == IStatus.CANCEL)
                    Display.getDefault().asyncExec(new Runnable() {
                        public void run() {
                            // don't use getShell(event) here since
                            // the active shell has changed since the
                            // execution has been triggered.
                            Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
                            MessageDialog.openInformation(shell, UIText.MergeAction_MergeCanceledTitle,
                                    UIText.MergeAction_MergeCanceledMessage);
                        }
                    });
                else if (!result.isOK())
                    Activator.handleError(result.getMessage(), result.getException(), true);
                else
                    Display.getDefault().asyncExec(new Runnable() {
                        public void run() {
                            Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
                            MergeResultDialog.getDialog(shell, repository, op.getResult()).open();
                        }
                    });
            }
        });
        job.schedule();
        return null;
    }

    /* copy of {@link org.eclipse.egit.ui.internal.repository.tree.command.MergeCommand#canMerge(Repository)}
     * @param repository
     * @return true of merge is allowed */
    private boolean canMerge(final Repository repository) {
        String message = null;
        Exception ex = null;
        try {
            Ref head = repository.getRef(Constants.HEAD);
            if (head == null || !head.isSymbolic())
                message = UIText.MergeAction_HeadIsNoBranch;
            else if (!repository.getRepositoryState().equals(RepositoryState.SAFE))
                message = NLS.bind(UIText.MergeAction_WrongRepositoryState, repository.getRepositoryState());
        } catch (IOException e) {
            message = e.getMessage();
            ex = e;
        }

        if (message != null)
            Activator.handleError(UIText.MergeAction_CannotMerge, ex, true);
        return (message == null);
    }

    /**
     * @param event
     * @return the shell for the event
     */
    public Shell getShell(ExecutionEvent event) {
        return HandlerUtil.getActiveShell(event);
    }

}