| /******************************************************************************* |
| * Copyright (c) 2014, 2018 Obeo and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v2.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v20.html |
| * |
| * Contributors: |
| * Obeo - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ocl.examples.emf.validation.validity.export; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.IRegistryEventListener; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.jdt.annotation.NonNull; |
| import org.eclipse.ocl.examples.emf.validation.validity.plugin.ValidityPlugin; |
| |
| /** |
| * |
| * This listener will allow us to be aware of contribution changes against the |
| * exporter extension point. |
| */ |
| public class ValidityExporterListener implements IRegistryEventListener |
| { |
| /** Name of the extension point to parse for extensions. */ |
| public static final String VALIDITY_EXPORTER_EXTENSION_POINT = ValidityPlugin.PLUGIN_ID + "." + ValidityPlugin.VALIDITY_EXPORTER_PPID; //$NON-NLS-1$ |
| |
| /** Name of the extension point's "EXPORTEXTENSION" tag. */ |
| private static final @NonNull String VALIDITY_EXPORTER_TAG_EXTENSION = "exporter"; //$NON-NLS-1$ |
| private static final @NonNull String VALIDITY_EXPORTER_CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$ |
| private static final @NonNull String VALIDITY_EXPORTER_NAME_ATTRIBUTE = "name"; //$NON-NLS-1$ |
| private static final @NonNull String VALIDITY_EXPORTER_TYPE_ATTRIBUTE = "type"; //$NON-NLS-1$ |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @see org.eclipse.core.runtime.IRegistryEventListener#added(org.eclipse.core.runtime.IExtension[]) |
| */ |
| public void added(IExtension[] extensions) { |
| for (IExtension extension : extensions) { |
| parseExtension(extension); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @see org.eclipse.core.runtime.IRegistryEventListener#added(org.eclipse.core.runtime.IExtensionPoint[]) |
| */ |
| public void added(IExtensionPoint[] extensionPoints) { |
| // no need to listen to this event |
| } |
| |
| /** |
| * Logs the error in the desktop log using the provided text and the |
| * information in the configuration element. |
| */ |
| protected void logError(IConfigurationElement element, String text) { |
| IExtension extension = element.getDeclaringExtension(); |
| System.err.println("Plugin " + extension.getContributor().getName() + ", extension " + extension.getExtensionPointUniqueIdentifier()); |
| System.err.println(text); |
| } |
| |
| /** |
| * Logs a very common registry error when a required attribute is missing. |
| */ |
| protected void logMissingAttribute(IConfigurationElement element, String attributeName) { |
| logError(element, "The required attribute '" + attributeName + "' not defined"); |
| } |
| |
| /** |
| * Parses a single extension contribution. |
| * |
| * @param extension |
| * Parses the given extension and adds its contribution to the |
| * registry. |
| */ |
| private void parseExtension(IExtension extension) { |
| final IConfigurationElement[] configElements = extension.getConfigurationElements(); |
| for (IConfigurationElement elem : configElements) { |
| String name = elem.getName(); |
| if (VALIDITY_EXPORTER_TAG_EXTENSION.equals(name)) { |
| String exporterType = elem.getAttribute(VALIDITY_EXPORTER_TYPE_ATTRIBUTE); |
| String exporterName = elem.getAttribute(VALIDITY_EXPORTER_NAME_ATTRIBUTE); |
| if (exporterType == null) { |
| logMissingAttribute(elem, VALIDITY_EXPORTER_TYPE_ATTRIBUTE); |
| } |
| else if (exporterName == null) { |
| logMissingAttribute(elem, VALIDITY_EXPORTER_NAME_ATTRIBUTE); |
| } |
| else { |
| ValidityExporterRegistry.INSTANCE.addExporter(new ValidityExporterDescriptor(elem, VALIDITY_EXPORTER_CLASS_ATTRIBUTE, exporterType, exporterName)); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Though this listener reacts to the extension point changes, there could |
| * have been contributions before it's been registered. This will parse |
| * these initial contributions. |
| */ |
| public void parseInitialContributions() { |
| final IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = registry.getExtensionPoint(VALIDITY_EXPORTER_EXTENSION_POINT); |
| for (IExtension extension : extensionPoint.getExtensions()) { |
| parseExtension(extension); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @see org.eclipse.core.runtime.IRegistryEventListener#removed(org.eclipse.core.runtime.IExtension[]) |
| */ |
| public void removed(IExtension[] extensions) { |
| for (IExtension extension : extensions) { |
| final IConfigurationElement[] configElements = extension.getConfigurationElements(); |
| for (IConfigurationElement elem : configElements) { |
| String name = elem.getName(); |
| if (VALIDITY_EXPORTER_TAG_EXTENSION.equals(name)) { |
| String exporterType = elem.getAttribute(VALIDITY_EXPORTER_TYPE_ATTRIBUTE); |
| if (exporterType == null) { |
| logMissingAttribute(elem, VALIDITY_EXPORTER_TYPE_ATTRIBUTE); |
| } |
| else { |
| ValidityExporterRegistry.INSTANCE.removeExtension(exporterType); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @see org.eclipse.core.runtime.IRegistryEventListener#removed(org.eclipse.core.runtime.IExtensionPoint[]) |
| */ |
| public void removed(IExtensionPoint[] extensionPoints) { |
| // no need to listen to this event |
| } |
| } |