ActivateAgeEditorAction.java

/**
 * Copyright (c) 2004-2025 Carnegie Mellon University and others. (see Contributors file). 
 * All Rights Reserved.
 *
 * NO WARRANTY. ALL MATERIAL IS FURNISHED ON AN "AS-IS" BASIS. CARNEGIE MELLON UNIVERSITY MAKES NO WARRANTIES OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, AS TO ANY MATTER INCLUDING, BUT NOT LIMITED TO, WARRANTY OF FITNESS FOR PURPOSE
 * OR MERCHANTABILITY, EXCLUSIVITY, OR RESULTS OBTAINED FROM USE OF THE MATERIAL. CARNEGIE MELLON UNIVERSITY DOES NOT
 * MAKE ANY WARRANTY OF ANY KIND WITH RESPECT TO FREEDOM FROM PATENT, TRADEMARK, OR COPYRIGHT INFRINGEMENT.
 *
 * This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * SPDX-License-Identifier: EPL-2.0
 *
 * Created, in part, with funding and support from the United States Government. (see Acknowledgments file).
 *
 * This program includes and/or can make use of certain third party source code, object code, documentation and other
 * files ("Third Party Software"). The Third Party Software that is used by this program is dependent upon your system
 * configuration. By using this program, You agree to comply with any and all relevant Third Party Software terms and
 * conditions contained in any such Third Party Software or separate license file distributed with such Third Party
 * Software. The parties who own the Third Party Software ("Third Party Licensors") are intended third party benefici-
 * aries to this license with respect to the terms applicable to their Third Party Software. Third Party Software li-
 * censes only apply to the Third Party Software and not any other portion of this program or this program as a whole.
 */
package org.osate.ge.internal.ui.editor;

import java.lang.ref.WeakReference;
import java.util.Objects;

import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchSite;
import org.osate.ge.internal.services.AgeAction;

/**
 * Action which activates the referenced editor. Returns itself as the undo action.
 *
 */
public class ActivateAgeEditorAction implements AgeAction {
	private WeakReference<InternalDiagramEditor> weakEditor;

	public ActivateAgeEditorAction(final InternalDiagramEditor editor) {
		this.weakEditor = new WeakReference<>(Objects.requireNonNull(editor, "editor must not be null"));
	}

	@Override
	public AgeAction execute() {
		// Activate the stored editor
		final InternalDiagramEditor editor = weakEditor.get();
		if (editor != null) {
			final IWorkbenchSite site = editor.getSite();
			if (site != null) {
				final IWorkbenchPage page = site.getPage();
				if (page != null && page.getActiveEditor() != editor) {
					page.activate(editor);
				}
			}
		}

		return this;
	}

	@Override
	public boolean isValid() {
		final InternalDiagramEditor editor = weakEditor.get();
		if (editor == null) {
			return false;
		}

		if (editor.isDisposed()) {
			return false;
		}

		return true;
	}
}