Package org.eclipse.egit.ui.internal.actions

Source Code of org.eclipse.egit.ui.internal.actions.MergeActionHandler

/*******************************************************************************
* 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:
*    Stefan Lay (SAP AG) - initial implementation
*******************************************************************************/

package org.eclipse.egit.ui.internal.actions;

import java.io.IOException;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.WorkspaceJob;
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.BasicConfigurationDialog;
import org.eclipse.egit.ui.internal.dialogs.MergeTargetSelectionDialog;
import org.eclipse.egit.ui.internal.merge.MergeResultDialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
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.osgi.util.NLS;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;

/**
* Action for selecting a commit and merging it with the current branch.
*/
public class MergeActionHandler extends RepositoryActionHandler {

  public Object execute(final ExecutionEvent event) throws ExecutionException {
    final Repository repository = getRepository(true, event);
    if (repository == null)
      return null;

    if (!checkMergeIsPossible(repository, getShell(event)))
      return null;
    BasicConfigurationDialog.show(repository);
    MergeTargetSelectionDialog mergeTargetSelectionDialog = new MergeTargetSelectionDialog(
        getShell(event), repository);
    if (mergeTargetSelectionDialog.open() == IDialogConstants.OK_ID) {

      final String refName = mergeTargetSelectionDialog.getRefName();

      String jobname = NLS.bind(UIText.MergeAction_JobNameMerge, refName);
      final MergeOperation op = new MergeOperation(repository, refName);
      op.setSquash(mergeTargetSelectionDialog.isMergeSquash());
      op.setFastForwardMode(mergeTargetSelectionDialog.getFastForwardMode());
      op.setCommit(mergeTargetSelectionDialog.isCommit());
      Job job = new WorkspaceJob(jobname) {
        @Override
        public IStatus runInWorkspace(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;
  }

  @Override
  public boolean isEnabled() {
    Repository repo = getRepository();
    return repo != null
        && repo.getRepositoryState() == RepositoryState.SAFE
        && isLocalBranchCheckedout(repo);
  }

  /**
   * Checks if merge is possible:
   * <ul>
   * <li>HEAD must point to a branch</li>
   * <li>Repository State must be SAFE</li>
   * </ul>
   * Shows an error dialog if a merge is not possible.
   *
   * @param repository
   *            the repository used for the merge
   * @param shell
   *            used to show a dialog in the error case
   * @return true if a merge is possible on the current HEAD
   */
  public static boolean checkMergeIsPossible(Repository repository, Shell shell) {
    String message = 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) {
      Activator.logError(e.getMessage(), e);
      message = e.getMessage();
    }

    if (message != null)
      MessageDialog.openError(shell, UIText.MergeAction_CannotMerge, message);
    return (message == null);
  }
}
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