ActionDeleteCompleted.java

/*******************************************************************************
 * Copyright (c) 2000, 2006 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.markers.internal;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.commands.operations.IUndoableOperation;
import org.eclipse.core.resources.IMarker;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.ide.undo.DeleteMarkersOperation;
import org.eclipse.ui.ide.undo.WorkspaceUndoUtil;

/**
 * ActionDeleteCompleted is the action for deleting completed markers.
 * 
 */
public class ActionDeleteCompleted extends MarkerSelectionProviderAction {

	private TaskView part;

	/**
	 * Constructs an ActionDeleteCompleted instance
	 * 
	 * @param part
	 * @param provider
	 */
	public ActionDeleteCompleted(TaskView part, ISelectionProvider provider) {
		super(provider, MarkerMessages.deleteCompletedAction_title);
		this.part = part;
		setEnabled(false);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.Action#run()
	 */
	public void run() {
		final List completed = getCompletedTasks();
		// Check if there is anything to do
		if (completed.size() == 0) {
			MessageDialog.openInformation(part.getSite().getShell(),
					MarkerMessages.deleteCompletedTasks_dialogTitle,
					MarkerMessages.deleteCompletedTasks_noneCompleted);
			return;
		}
		String message;
		if (completed.size() == 1) {
			message = MarkerMessages.deleteCompletedTasks_permanentSingular;
		} else {
			message = NLS.bind(
					MarkerMessages.deleteCompletedTasks_permanentPlural, String
							.valueOf(completed.size()));
		}
		// Verify.
		if (!MessageDialog.openConfirm(part.getSite().getShell(),
				MarkerMessages.deleteCompletedTasks_dialogTitle, message)) {
			return;
		}
		IMarker[] markers = (IMarker[]) completed.toArray(new IMarker[completed
				.size()]);
		IUndoableOperation op = new DeleteMarkersOperation(markers, getText());
		execute(op, MarkerMessages.deleteCompletedTasks_errorMessage, null,
				WorkspaceUndoUtil.getUIInfoAdapter(part.getSite().getShell()));
	}

	private List getCompletedTasks() {
		List completed = new ArrayList();

		MarkerList markerList = part.getVisibleMarkers();

		ConcreteMarker[] markers = markerList.toArray();

		for (int i = 0; i < markers.length; i++) {
			ConcreteMarker marker = markers[i];
			if (marker instanceof TaskMarker) {
				TaskMarker taskMarker = (TaskMarker) marker;

				if (taskMarker.getDone() == 1) {
					completed.add(taskMarker.getMarker());
				}
			}
		}

		return completed;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.actions.SelectionProviderAction#selectionChanged(org.eclipse.jface.viewers.IStructuredSelection)
	 */
	public void selectionChanged(IStructuredSelection selection) {
		setEnabled(!selection.isEmpty());
	}

}