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

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

/*******************************************************************************
* Copyright (C) 2010, 2013 Roland Grunberg <rgrunber@redhat.com>
*
* 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:
*   Benjamin Muskalla (Tasktop Technologies Inc.) - support for model scoping
*   François Rey <eclipse.org_@_francois_._rey_._name> - handling of linked resources
*******************************************************************************/
package org.eclipse.egit.ui.internal.actions;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IResource;
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.OperationCanceledException;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.egit.core.op.DiscardChangesOperation;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.JobFamilies;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.operations.GitScopeUtil;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.ui.IWorkbenchPart;

/**
* Checkout all selected dirty files.
*/
public class DiscardChangesActionHandler extends RepositoryActionHandler {

  public Object execute(ExecutionEvent event) throws ExecutionException {

    IWorkbenchPart part = getPart(event);
    boolean performAction = MessageDialog.openConfirm(getShell(event),
        UIText.DiscardChangesAction_confirmActionTitle,
        UIText.DiscardChangesAction_confirmActionMessage);
    if (!performAction)
      return null;
    final DiscardChangesOperation operation = createOperation(part, event);
    if (operation == null)
      return null;
    String jobname = UIText.DiscardChangesAction_discardChanges;
    Job job = new WorkspaceJob(jobname) {
      @Override
      public IStatus runInWorkspace(IProgressMonitor monitor) {
        try {
          operation.execute(monitor);
        } catch (CoreException e) {
          return Activator.createErrorStatus(e.getStatus()
              .getMessage(), e);
        }
        return Status.OK_STATUS;
      }

      @Override
      public boolean belongsTo(Object family) {
        if (JobFamilies.DISCARD_CHANGES.equals(family))
          return true;
        return super.belongsTo(family);
      }
    };
    job.setUser(true);
    job.setRule(operation.getSchedulingRule());
    job.schedule();
    return null;
  }

  @Override
  public boolean isEnabled() {
    Repository[] repositories = getRepositories();
    if (repositories.length == 0)
      return false;
    for (Repository repository : repositories) {
      if (!repository.getRepositoryState().equals(RepositoryState.SAFE))
        return false;
    }
    return true;
  }

  private DiscardChangesOperation createOperation(IWorkbenchPart part,
      ExecutionEvent event) throws ExecutionException {

    IResource[] selectedResources = gatherResourceToOperateOn(event);
    String revision;
    try {
      revision = gatherRevision(event);
    } catch (OperationCanceledException e) {
      return null;
    }

    IResource[] resourcesInScope;
    try {
      resourcesInScope = GitScopeUtil.getRelatedChanges(part,
          selectedResources);
    } catch (InterruptedException e) {
      // ignore, we will not discard the files in case the user
      // cancels the scope operation
      return null;
    }

    return new DiscardChangesOperation(resourcesInScope, revision);

  }

  /**
   * @param event
   * @return set of resources to operate on
   * @throws ExecutionException
   */
  protected IResource[] gatherResourceToOperateOn(ExecutionEvent event)
      throws ExecutionException {
    return getSelectedResources(event);
  }

  /**
   * @param event
   * @return the revision to use
   * @throws ExecutionException
   */
  protected String gatherRevision(ExecutionEvent event)
      throws ExecutionException {
    return null;
  }
}
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