| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal; |
| |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.ui.internal.util.BundleUtility; |
| import org.osgi.framework.Bundle; |
| |
| /** |
| * Provides access to resource-specific classes, needed to provide |
| * backwards compatibility for resource-specific functions which |
| * could not be moved up from the generic workbench layer to the |
| * IDE layer. |
| */ |
| public final class LegacyResourceSupport { |
| |
| /** |
| * Cached value of |
| * <code>Class.forName("org.eclipse.core.resources.IResource")</code>; |
| * <code>null</code> if not initialized or not present. |
| * @since 3.0 |
| */ |
| private static Class iresourceClass = null; |
| /** |
| * Cached value of |
| * <code>Class.forName("org.eclipse.ui.IContributorResourceAdapter")</code>; |
| * <code>null</code> if not initialized or not present. |
| * @since 3.0 |
| */ |
| private static Class icontributorResourceAdapterClass = null; |
| /** |
| * Cached value of |
| * <code>Class.forName("org.eclipse.ui.internal.ide.DefaultContributorResourceAdapter")</code>; |
| * <code>null</code> if not initialized or not present. |
| * @since 3.0 |
| */ |
| private static Class defaultContributorResourceAdapterClass = null; |
| /** |
| * Indicates whether the resources plug-in is even around. |
| * Without the resources plug-in, adapting to resource is moot. |
| */ |
| private static boolean resourcesPossible = true; |
| /** |
| * Indicates whether the IDE plug-in (which supplies the |
| * resource contribution adapters) is even around. |
| */ |
| private static boolean resourceAdapterPossible = true; |
| |
| /** |
| * Returns <code>IResource.class</code> or <code>null</code> if the |
| * class is not available. |
| * <p> |
| * This method exists to avoid explicit references from the generic |
| * workbench to the resources plug-in. |
| * </p> |
| * |
| * @return <code>IResource.class</code> or <code>null</code> if class |
| * not available |
| * @since 3.0 |
| */ |
| public static Class getResourceClass() { |
| if (iresourceClass != null) { |
| // tried before and succeeded |
| return iresourceClass; |
| } |
| if (!resourcesPossible) { |
| // tried before and failed |
| return null; |
| } |
| |
| // resource plug-in is not on prereq chain of generic wb plug-in |
| // hence: IResource.class won't compile |
| // and Class.forName("org.eclipse.core.resources.IResource") won't find it |
| // need to be trickier... |
| Bundle bundle = Platform.getBundle("org.eclipse.core.resources"); //$NON-NLS-1$ |
| if (bundle == null) { |
| // resources plug-in is not around |
| // assume that it will never be around |
| resourcesPossible = false; |
| return null; |
| } |
| // resources plug-in is around |
| // it's not our job to activate the plug-in |
| if (!BundleUtility.isActivated(bundle)) { |
| // assume it might come alive later |
| resourcesPossible = true; |
| return null; |
| } |
| try { |
| Class c = bundle.loadClass("org.eclipse.core.resources.IResource"); //$NON-NLS-1$ |
| // remember for next time |
| iresourceClass = c; |
| return iresourceClass; |
| } catch (ClassNotFoundException e) { |
| // unable to load IResource - sounds pretty serious |
| // treat as if resources plug-in were unavailable |
| resourcesPossible = false; |
| return null; |
| } |
| } |
| |
| /** |
| * Returns <code>IContributorResourceAdapter.class</code> or |
| * <code>null</code> if the class is not available. |
| * <p> |
| * This method exists to avoid explicit references from the generic |
| * workbench to the IDE plug-in. |
| * </p> |
| * |
| * @return <code>IContributorResourceAdapter.class</code> or |
| * <code>null</code> if class not available |
| * @since 3.0 |
| */ |
| public static Class getIContributorResourceAdapterClass() { |
| if (icontributorResourceAdapterClass != null) { |
| // tried before and succeeded |
| return icontributorResourceAdapterClass; |
| } |
| if (!resourceAdapterPossible) { |
| // tried before and failed |
| return null; |
| } |
| |
| // IDE plug-in is not on prereq chain of generic wb plug-in |
| // hence: IContributorResourceAdapter.class won't compile |
| // and Class.forName("org.eclipse.ui.IContributorResourceAdapter") won't find it |
| // need to be trickier... |
| Bundle bundle = Platform.getBundle("org.eclipse.ui.ide"); //$NON-NLS-1$ |
| if (bundle== null) { |
| // IDE plug-in is not around |
| // assume that it will never be around |
| resourceAdapterPossible = false; |
| return null; |
| } |
| // IDE plug-in is around |
| // it's not our job to activate the plug-in |
| if (!BundleUtility.isActivated(bundle)) { |
| // assume it might come alive later |
| resourceAdapterPossible = true; |
| return null; |
| } |
| try { |
| Class c = bundle.loadClass("org.eclipse.ui.IContributorResourceAdapter"); //$NON-NLS-1$ |
| // remember for next time |
| icontributorResourceAdapterClass = c; |
| return icontributorResourceAdapterClass; |
| } catch (ClassNotFoundException e) { |
| // unable to load IContributorResourceAdapter - sounds pretty serious |
| // treat as if IDE plug-in were unavailable |
| resourceAdapterPossible = false; |
| return null; |
| } |
| } |
| |
| /** |
| * Returns <code>DefaultContributorResourceAdapter.class</code> or |
| * <code>null</code> if the class is not available. |
| * <p> |
| * This method exists to avoid explicit references from the generic |
| * workbench to the IDE plug-in. |
| * </p> |
| * |
| * @return <code>DefaultContributorResourceAdapter.class</code> or |
| * <code>null</code> if class not available |
| * @since 3.0 |
| */ |
| public static Class getDefaultContributorResourceAdapterClass() { |
| if (defaultContributorResourceAdapterClass != null) { |
| // tried before and succeeded |
| return defaultContributorResourceAdapterClass; |
| } |
| if (!resourceAdapterPossible) { |
| // tried before and failed |
| return null; |
| } |
| |
| // IDE plug-in is not on prereq chain of generic wb plug-in |
| // hence: DefaultContributorResourceAdapter.class won't compile |
| // and Class.forName("org.eclipse.ui.internal.ide.DefaultContributorResourceAdapter") won't find it |
| // need to be trickier... |
| Bundle bundle = Platform.getBundle("org.eclipse.ui.ide"); //$NON-NLS-1$ |
| if (bundle== null) { |
| // IDE plug-in is not around |
| // assume that it will never be around |
| resourceAdapterPossible = false; |
| return null; |
| } |
| // IDE plug-in is around |
| // it's not our job to activate the plug-in |
| if (!BundleUtility.isActivated(bundle)) { |
| // assume it might come alive later |
| resourceAdapterPossible = true; |
| return null; |
| } |
| try { |
| Class c = bundle.loadClass("org.eclipse.ui.internal.ide.DefaultContributorResourceAdapter"); //$NON-NLS-1$ |
| // remember for next time |
| defaultContributorResourceAdapterClass = c; |
| return defaultContributorResourceAdapterClass; |
| } catch (ClassNotFoundException e) { |
| // unable to load DefaultContributorResourceAdapter - sounds pretty serious |
| // treat as if IDE plug-in were unavailable |
| resourceAdapterPossible = false; |
| return null; |
| } |
| } |
| |
| /** |
| * Prevents construction |
| */ |
| private LegacyResourceSupport() { |
| // do nothing |
| } |
| |
| |
| } |
