/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.tasklist;

import java.util.ArrayList;
import java.util.Map;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.part.MarkerTransfer;

/**
 * Standard action for pasting tasks from the clipboard.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 * 
 * @since 2.0
 */
class PasteTaskAction extends TaskAction {

	/**
	 * Creates a new action.
	 */
	public PasteTaskAction(TaskList tasklist, String id) {
		super(tasklist, id);
		WorkbenchHelp.setHelp(this, ITaskListHelpContextIds.PASTE_TASK_ACTION);
	}

	/**
	 * Implementation of method defined on <code>IAction</code>.
	 */
	public void run() {
		// Get the markers from the clipboard
		MarkerTransfer transfer = MarkerTransfer.getInstance();
		final IMarker[] markerData = (IMarker[])getTaskList().getClipboard().getContents(transfer);
		
		if (markerData == null) 
			return;
	
	 	final ArrayList newMarkers = new ArrayList();
	
		try {
			getTaskList().getWorkspace().run(new IWorkspaceRunnable() {
				public void run(IProgressMonitor monitor) throws CoreException {
					for (int i = 0; i < markerData.length; i++) {
						// Only paste tasks (not problems)
						if (!markerData[i].getType().equals(IMarker.TASK))
							continue;
							
						// Paste to the same resource as the original
						IResource resource = markerData[i].getResource();
						Map attributes = markerData[i].getAttributes();
						IMarker marker = resource.createMarker(IMarker.TASK);
						marker.setAttributes(attributes);
						newMarkers.add(marker);
					}
				}
			}, null);
		} catch (CoreException e) {
			ErrorDialog.openError(
				getShell(),
				TaskListMessages.getString("PasteTask.errorMessage"), //$NON-NLS-1$
				null,
				e.getStatus());
			return;
		}
	
		// Need to do this in an asyncExec, even though we're in the UI thread here,
		// since the task list updates itself with the addition in an asyncExec,
		// which hasn't been processed yet.
		// Must be done outside IWorkspaceRunnable above since notification for add is
		// sent after IWorkspaceRunnable is run.
		if (newMarkers.size() > 0) {
			getShell().getDisplay().asyncExec(new Runnable() {
				public void run() {
					TaskList taskList = getTaskList();
					taskList.setSelection(new StructuredSelection(newMarkers), true);	
				}
			});
		}
	}

}