| /******************************************************************************* |
| * Copyright (c) 2015 EclipseSource Muenchen GmbH 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: |
| * Stefan Dirix - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.emf.compare.ide.ui.dependency; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.emf.compare.ide.ui.internal.EMFCompareIDEUIMessages; |
| import org.eclipse.emf.compare.ide.ui.internal.EMFCompareIDEUIPlugin; |
| |
| /** |
| * This class is used for information flow between {@link ModelDependencyProviderRegistryListener} and |
| * {@link ModelDependencyProviderRegistry} and managing the creation of {@link IDependencyProvider} instances. |
| * |
| * @author Stefan Dirix <sdirix@eclipsesource.com> |
| */ |
| public class DependencyProviderDescriptor { |
| |
| /** Underlying {@link IConfigurationElement} describing this dependency provider. */ |
| private final IConfigurationElement configurationElement; |
| |
| /** |
| * Name of the configuration property that can be used to retrieve the qualified class name of this |
| * dependency provider. |
| */ |
| private final String attributeClassName; |
| |
| /** Don't log the same error multiple times. */ |
| private boolean logOnce; |
| |
| /** |
| * Default constructor. |
| * |
| * @param attributeName |
| * The name of the configuration attribute responsible for the registered |
| * {@link IDependencyProvider}. |
| * @param configurationElement |
| * The {@link IConfigurationElement} containing all relevant extension information. |
| */ |
| public DependencyProviderDescriptor(String attributeName, IConfigurationElement configurationElement) { |
| this.attributeClassName = attributeName; |
| this.configurationElement = configurationElement; |
| } |
| |
| /** |
| * Returns the {@link IDependencyProvider}. |
| * |
| * @return The newly created {@link IDependencyProvider}. |
| */ |
| public IDependencyProvider getDependencyProvider() { |
| try { |
| final IDependencyProvider provider = (IDependencyProvider)configurationElement |
| .createExecutableExtension(attributeClassName); |
| return provider; |
| } catch (CoreException e) { |
| if (!logOnce) { |
| logOnce = true; |
| final String className = configurationElement.getAttribute(attributeClassName); |
| final String message = EMFCompareIDEUIMessages.getString( |
| "ModelDependencyProviderRegistry.invalidModelDependency", className); //$NON-NLS-1$ |
| final IStatus status = new Status(IStatus.ERROR, configurationElement.getDeclaringExtension() |
| .getContributor().getName(), message, e); |
| EMFCompareIDEUIPlugin.getDefault().getLog().log(status); |
| } |
| } |
| return null; |
| } |
| } |