| /****************************************************************************** |
| * Copyright (c) 2005, 2006 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| |
| package org.eclipse.gmf.runtime.emf.type.core.internal.descriptors; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.emf.ecore.EPackage; |
| import org.eclipse.gmf.runtime.common.core.util.Log; |
| import org.eclipse.gmf.runtime.common.core.util.StringStatics; |
| import org.eclipse.gmf.runtime.emf.type.core.internal.EMFTypePlugin; |
| import org.eclipse.gmf.runtime.emf.type.core.internal.EMFTypePluginStatusCodes; |
| import org.eclipse.gmf.runtime.emf.type.core.internal.l10n.EMFTypeCoreMessages; |
| |
| /** |
| * Describes a metamodel. Loading the metamodel is delayed until access is made |
| * to {{@link #getEPackage()}. |
| * |
| * @author ldamus |
| */ |
| public class MetamodelDescriptor { |
| |
| /** |
| * The metamodel package. |
| */ |
| private EPackage ePackage; |
| |
| /** |
| * The namespace URI of the metamodel package. |
| */ |
| private final String nsURI; |
| |
| /** |
| * Flag indicating that a metamodel could not be found with my namespace |
| * URI. |
| */ |
| private boolean metamodelNotFound = false; |
| |
| /** |
| * Creates a new metamodel descriptor from a configuration element. |
| * |
| * @param configElement |
| * the configuration element |
| * @throws CoreException |
| * when the EPackage namespace URI is not |
| * specified in the configuration element |
| */ |
| public MetamodelDescriptor(IConfigurationElement configElement) |
| throws CoreException { |
| |
| nsURI = configElement.getAttribute(ElementTypeXmlConfig.A_NSURI); |
| if (nsURI == null) { |
| throw EMFTypePluginStatusCodes.getMetamodelInitException( |
| StringStatics.BLANK, EMFTypeCoreMessages.metamodel_reason_no_nsURI_WARN_); |
| } |
| } |
| |
| /** |
| * Gets the metamodel package. |
| * |
| * @return the metamodel package |
| */ |
| public EPackage getEPackage() { |
| |
| if (ePackage == null & !metamodelNotFound) { |
| ePackage = (getNsURI() != null) ? EPackage.Registry.INSTANCE |
| .getEPackage(getNsURI()) : null; |
| |
| if (ePackage == null) { |
| metamodelNotFound = true; |
| Log |
| .error( |
| EMFTypePlugin.getPlugin(), |
| EMFTypePluginStatusCodes.METAMODEL_NOT_INITED, |
| EMFTypeCoreMessages |
| .bind( |
| EMFTypeCoreMessages.metamodel_not_init_WARN_, |
| nsURI, |
| EMFTypeCoreMessages.metamodel_reason_nsURI_not_found_WARN_)); |
| } |
| } |
| return ePackage; |
| } |
| |
| /** |
| * Gets the namespace URI for the metamodel. |
| * |
| * @return the namespace URI |
| */ |
| public String getNsURI() { |
| return nsURI; |
| } |
| } |