| /** |
| * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany) |
| * 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: |
| * Florian Pirchner - Initial implementation |
| */ |
| package org.eclipse.osbp.dsl.xtext.lazyresolver.hook; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.CoreException; |
| 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.Platform; |
| import org.eclipse.xtext.util.Modules2; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.inject.Module; |
| |
| /** |
| * Delegates generation to registered extensions. See extensionpoint |
| * "org.eclipse.osbp.dsl.xtext.lazyresolver.generatorDelegate" |
| */ |
| public class ExtensionsRuntimeModulesProvider { |
| |
| private static final Logger LOGGER = LoggerFactory |
| .getLogger(ExtensionsRuntimeModulesProvider.class); |
| |
| private static final String ATTR_NAME = "runtimeModulesProvider"; //$NON-NLS-1$ |
| private static final String ATTR_GRAMMAR = "grammarName"; //$NON-NLS-1$ |
| private static final String ATTR_PRIO = "prio"; //$NON-NLS-1$ |
| private static final String ATTR_CLASS = "module"; //$NON-NLS-1$ |
| |
| /** |
| * The instance. Using a singleton since extensions may only be available at |
| * platformlevel once. |
| */ |
| private static final ExtensionsRuntimeModulesProvider INSTANCE = new ExtensionsRuntimeModulesProvider(); |
| |
| /** |
| * Returns the instance of the extension runtime modules provider. |
| * |
| * @return the instance |
| */ |
| public static ExtensionsRuntimeModulesProvider getInstance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Returns a mixin of all provided modules. If no modules have been |
| * provided, <code>null</code> is returned. |
| * |
| * @param grammarName |
| * @return |
| */ |
| public Module get(String grammarName) { |
| List<Module> modules = readExtentions(grammarName); |
| if (!modules.isEmpty()) { |
| return Modules2.mixin(modules.toArray(new Module[modules.size()])); |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Extensions are being processed new for each request, since each call |
| * needs a new instance of inferrer. |
| * |
| * @param grammarName |
| * @return |
| */ |
| private List<Module> readExtentions(String grammarName) { |
| IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| IExtensionPoint point = registry.getExtensionPoint( |
| "org.eclipse.osbp.dsl.xtext.lazyresolver.api", ATTR_NAME); |
| if (point == null) { |
| return Collections.emptyList(); |
| } |
| |
| // filter extensions |
| List<IConfigurationElement> temp = new ArrayList<IConfigurationElement>(); |
| IExtension[] extensions = point.getExtensions(); |
| for (int i = 0; i < extensions.length; i++) { |
| IConfigurationElement[] elements = extensions[i] |
| .getConfigurationElements(); |
| for (int j = 0; j < elements.length; j++) { |
| String _grammarName = elements[j].getAttribute(ATTR_GRAMMAR); |
| if (_grammarName != null && _grammarName.equals(grammarName)) { |
| |
| temp.add(elements[j]); |
| |
| } |
| } |
| } |
| |
| // sort the elements |
| Collections.sort(temp, new Comparator<IConfigurationElement>() { |
| @Override |
| public int compare(IConfigurationElement o1, |
| IConfigurationElement o2) { |
| return o1.getAttribute(ATTR_PRIO).compareTo( |
| o2.getAttribute(ATTR_PRIO)); |
| } |
| }); |
| |
| // create instances |
| List<Module> delegates = new ArrayList<Module>(1); |
| for (IConfigurationElement element : temp) { |
| try { |
| Module delegate = (Module) element |
| .createExecutableExtension(ATTR_CLASS); |
| delegates.add(delegate); |
| } catch (CoreException e) { |
| LOGGER.error("{}", e); |
| } |
| } |
| |
| return delegates; |
| } |
| |
| } |