| /** |
| * <copyright> |
| * |
| * Copyright (c) 2007, 2008 Obeo. |
| * 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 |
| * |
| * </copyright> |
| * |
| * Contributors: |
| * Quentin Glineur - initial API and implementation |
| * |
| * $Id: EclipseProviderDescriptor.java,v 1.2 2008/10/09 17:21:08 qglineur Exp $ |
| */ |
| package org.eclipse.qvt.declarative.core.ide; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.qvt.declarative.common.framework.service.Provider; |
| import org.eclipse.qvt.declarative.common.framework.service.ProviderDescriptor; |
| |
| public class EclipseProviderDescriptor extends ProviderDescriptor { |
| |
| private static final String PRIORITY_ATTRIBUTE = "priority"; //$NON-NLS-1$ |
| |
| private static final String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$ |
| |
| private final IConfigurationElement element; |
| |
| private Priority providerPriority; |
| |
| private boolean providerClassInstantiationFailed = false; |
| |
| |
| public EclipseProviderDescriptor(IConfigurationElement element) { |
| this.element = element; |
| } |
| |
| @Override |
| public Provider getDescribedProvider() { |
| if (describedProvider == null && !providerClassInstantiationFailed) { |
| try { |
| describedProvider = (Provider)element.createExecutableExtension(CLASS_ATTRIBUTE); |
| } catch (CoreException ce) { |
| providerClassInstantiationFailed = true; |
| } |
| } |
| return describedProvider; |
| } |
| |
| @Override |
| public Priority getPriority() { |
| if (providerPriority == null) { |
| if (element != null && element.isValid()) { |
| String priority = element.getAttribute(PRIORITY_ATTRIBUTE); |
| providerPriority = Priority.valueOf(priority); |
| } |
| } |
| return providerPriority; |
| } |
| |
| } |