| /******************************************************************************* |
| * Copyright (c) 2007, 2010 BMW Car IT, Technische Universitaet Muenchen, and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * BMW Car IT - Initial API and implementation |
| * Technische Universitaet Muenchen - Major refactoring and extension |
| *******************************************************************************/ |
| package org.eclipse.emf.edapt.history.presentation.action; |
| |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| import org.eclipse.core.expressions.PropertyTester; |
| import org.eclipse.emf.edapt.common.ui.SelectionUtils; |
| import org.eclipse.emf.edapt.spi.history.Change; |
| import org.eclipse.emf.edapt.spi.history.Release; |
| import org.eclipse.jface.viewers.ISelection; |
| |
| /** |
| * Property tester to check whether selected changes are subsequent. |
| * |
| * @author herrmama |
| * @author $Author$ |
| * @version $Rev$ |
| * @levd.rating RED Rev: |
| */ |
| public class SubsequentChangesPropertyTester extends PropertyTester { |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean test(Object receiver, String property, Object[] args, |
| Object expectedValue) { |
| |
| final ISelection selection = (ISelection) receiver; |
| final List<Change> changes = SelectionUtils.getSelectedElements(selection, Change.class); |
| |
| return isValid(changes); |
| } |
| |
| /** |
| * Determine whether the selection is valid, i.e. the changes are subsequent |
| * and contained by a single release |
| * |
| * @return true if the changes are valid |
| */ |
| private boolean isValid(List<Change> changes) { |
| if (changes.isEmpty()) { |
| return false; |
| } |
| final Release release = sort(changes); |
| if (release == null) { |
| return false; |
| } |
| final int firstIndex = release.getChanges().indexOf(changes.get(0)); |
| final int lastIndex = release.getChanges().indexOf( |
| changes.get(changes.size() - 1)); |
| final boolean valid = lastIndex - firstIndex + 1 == changes.size(); |
| return valid; |
| } |
| |
| /** Sort the changes chronologically and return their common parent release. */ |
| public static Release sort(List<? extends Change> changes) { |
| final Release release = getRelease(changes); |
| if (release == null) { |
| return null; |
| } |
| Collections.sort(changes, new Comparator<Change>() { |
| |
| @Override |
| public int compare(Change c1, Change c2) { |
| final int i1 = release.getChanges().indexOf(c1); |
| final int i2 = release.getChanges().indexOf(c2); |
| return new Integer(i1).compareTo(i2); |
| } |
| |
| }); |
| return release; |
| } |
| |
| /** Get the release by which the changes are contained. */ |
| public static Release getRelease(List<? extends Change> changes) { |
| final Change first = changes.get(0); |
| if (!(first.eContainer() instanceof Release)) { |
| return null; |
| } |
| final Release release = (Release) first.eContainer(); |
| for (final Change change : changes) { |
| if (!(change.eContainer() == release)) { |
| return null; |
| } |
| } |
| return release; |
| } |
| } |