| /******************************************************************************* |
| * 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.IConfigurationElement; |
| import org.eclipse.core.runtime.ILog; |
| import org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener; |
| |
| /** |
| * This listener will react to changes against the model dependency extension point, allowing us to be in sync |
| * with plugin activation and deactivation. |
| * |
| * @author Stefan Dirix <sdirix@eclipsesource.com> |
| */ |
| public class ModelDependencyProviderRegistryListener extends AbstractRegistryEventListener { |
| |
| /** |
| * The name of the dependency element. |
| */ |
| private static final String DEPENDENCY_ELEMENT_NAME = "dependency"; //$NON-NLS-1$ |
| |
| /** |
| * The name of the class attribute of the dependency element. |
| */ |
| private static final String ATTRIBUTE_CLASS = "class"; //$NON-NLS-1$ |
| |
| /** |
| * The registry which will actually hold all information. |
| */ |
| private final ModelDependencyProviderRegistry registry; |
| |
| /** |
| * Initialize a registry event listener for our handlers. |
| * |
| * @param pluginID |
| * ID of the plugin contributing the extension point to monitor. |
| * @param extensionPointID |
| * Actual id of the extension point to monitor. |
| * @param log |
| * Log in which errors/warning should be logged. |
| * @param registry |
| * The actual store of handlers this registry will alter. |
| */ |
| public ModelDependencyProviderRegistryListener(String pluginID, String extensionPointID, ILog log, |
| ModelDependencyProviderRegistry registry) { |
| super(pluginID, extensionPointID, log); |
| this.registry = registry; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean validateExtensionElement(IConfigurationElement element) { |
| if (DEPENDENCY_ELEMENT_NAME.equals(element.getName())) { |
| final String className = element.getAttribute(ATTRIBUTE_CLASS); |
| return className != null && className.trim().length() > 0; |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean addedValid(IConfigurationElement element) { |
| final String className = element.getAttribute(ATTRIBUTE_CLASS); |
| final DependencyProviderDescriptor descriptor = new DependencyProviderDescriptor(ATTRIBUTE_CLASS, |
| element); |
| registry.addProvider(className, descriptor); |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean removedValid(IConfigurationElement element) { |
| final String className = element.getAttribute(ATTRIBUTE_CLASS); |
| registry.removeProvider(className); |
| return true; |
| } |
| |
| } |