/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * 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:
 *     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.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
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.PlatformUI;
import org.eclipse.ui.internal.views.tasklist.TaskListMessages;
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.
     * 
     * @param tasklist the task list
     * @param id the id
     */
    public PasteTaskAction(TaskList tasklist, String id) {
        super(tasklist, id);
        PlatformUI.getWorkbench().getHelpSystem().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.PasteTask_errorMessage, 
                    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);
                }
            });
        }
    }

}