| // PredicatesView.java |
| package org.eclipse.stem.ui.views; |
| |
| /******************************************************************************* |
| * Copyright (c) 2008 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 |
| *******************************************************************************/ |
| |
| import org.eclipse.stem.core.Constants; |
| import org.eclipse.stem.ui.Activator; |
| import org.eclipse.stem.ui.ISharedImages; |
| import org.eclipse.swt.graphics.Image; |
| |
| /** |
| * This class represents the eclipse view of the |
| * {@link org.eclipse.stem.core.predicate.Predicate}s that have been imported |
| * into eclipse as plug-ins. |
| */ |
| public class PredicatesView extends IdentifiablePluginView { |
| |
| /** |
| * The identifier of the Predicates View {@value} |
| */ |
| public static final String ID_PREDICATES_VIEW = "org.eclipse.stem.ui.views.predicates"; //$NON-NLS-1$ |
| |
| /** |
| * Constructor |
| */ |
| public PredicatesView() { |
| super(); |
| } |
| |
| /** |
| * @see org.eclipse.stem.ui.views.IdentifiablePluginView#getIdentifiablePluginViewLabelContentProvider() |
| */ |
| @Override |
| protected IdentifiablePluginViewLabelContentProvider getIdentifiablePluginViewLabelContentProvider() { |
| return new PredicatePluginViewLabelContentProvider(); |
| } |
| |
| /** |
| * @see org.eclipse.stem.ui.views.IdentifiablePluginView#getInput() |
| */ |
| @Override |
| protected IdentifiableViewModel getInput() { |
| return PredicateViewModel.getModel(); |
| } // getInput |
| |
| /** |
| * This class represents a singleton instance of a model of the STEM |
| * {@link Predicate}s that are plugged into the system. |
| */ |
| protected static class PredicateViewModel extends IdentifiableViewModel { |
| // The singleton instance |
| private static PredicateViewModel pvModel; |
| |
| private PredicateViewModel() { |
| super(Constants.ID_PREDICATE_EXTENSION_POINT); |
| } |
| |
| /** |
| * @return the singleton instance of the ModelViewModel |
| */ |
| public static PredicateViewModel getModel() { |
| if (pvModel == null) { |
| pvModel = new PredicateViewModel(); |
| } |
| return pvModel; |
| } // getModel |
| } // PredicateViewModel |
| |
| protected static class PredicatePluginViewLabelContentProvider extends |
| IdentifiablePluginViewLabelContentProvider { |
| |
| // This is the image used to represent predicates in the predicate view |
| static Image predicateIcon = null; |
| |
| // If true then we've never tried to get the icon |
| static boolean predicateIconFirstTime = true; |
| |
| /** |
| * @see org.eclipse.stem.ui.views.IdentifiablePluginView.IdentifiablePluginViewLabelContentProvider#getImage(java.lang.Object) |
| */ |
| @Override |
| public Image getImage(Object element) { |
| return (element instanceof IdentifiableDelegate) ? getPredicateIcon() |
| : super.getImage(element); |
| } // getImage |
| |
| /** |
| * @return the icon to be used to represent predicates, or null if it |
| * can't be loaded. |
| */ |
| private Image getPredicateIcon() { |
| // Should we try to load the icon? |
| if (predicateIconFirstTime && predicateIcon == null) { |
| // Yes |
| predicateIconFirstTime = false; |
| predicateIcon = Activator.getDefault().getImageRegistry().get( |
| ISharedImages.PREDICATE_ICON); |
| } // if we should load the icon |
| return predicateIcon; |
| } // getPredicateIcon |
| |
| } // PredicatePluginViewLabelContentProvider |
| } // PredicatesView |