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Standalone mode for QVTO (deployed to an online modeler) [message #922941]

Tue, 25 September 2012 13:25

thomas legrand

Messages: 10
Registered: September 2010

Junior Member

Hi all,

I work in a coding team around QVTo for M2M transformations and code generation. My team targets an online modeler coupled with a code generator.

I need to run qvto transformations in a standalone mode, i.e through a java application outside of Eclipse. My transformations use a blackbox java library but QVTo only searches it in the Eclipse plugin list. As a consequence my library is never found. I thought a solution relying on the classpath could be interesting.

I asked a few months ago if such a patch exists or if it was planned for the next releases of QVTo. But there was nothing around it. So I developed that patch by modifying the JavaBlackboxRegistry and JavaBlackboxProvider classes in org.eclipse.m2m.qvt.oml .

This patch works and it's actually deployed on our online modeler at www.genmymodel.com .

I wonder if this feature has been coded by the QVTo team or if my patch could be proposed and maintained.

Does anyone know more about it ?

Thanks in advance,
Tom

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Re: Standalone mode for QVTO (deployed to an online modeler) [message #956108 is a reply to message #922941]

Wed, 24 October 2012 08:45

Rolf Theunissen

Messages: 260
Registered: April 2012

Senior Member

Can you attach the patch to bug: 326871

This way the developers can review and pick up the patch.

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Re: Standalone mode for QVTO (deployed to an online modeler) [message #957539 is a reply to message #956108]

Thu, 25 October 2012 09:45

thomas legrand

Messages: 10
Registered: September 2010

Junior Member

Hi Rolf,

I would be glad to add the patch but I'm facing two problems.

To fix the bug one year ago, I modified 3 classes in the 3.1 version of org.eclipse.m2m.qvt.oml.
In the meantime, the plugin has evolved. A patch imposes to merge with the latest version of the public repository; it can take some time.

Moreover, a trick in the modified code is not very beautiful. In the JavaBlackboxProvider class, I set a hard-coded variable to give the namespace of the loaded Java library. I assumed the libraries are all based on Ecore metamodel because that was the case for my qvto transformations and It was not appropriated to add a registration mechanism in the plugin for the specific metamodels of the imported libraries.

To help you right now, what I suggest :

- I append below the 3 modified classes : JavaBlackboxProvider, BlackboxRegistry, BlackboxUnitResolver
- I study in details the latest snapshot and see the best way to merge those modifications

Let me know if the given classes help and let's go further.

/*******************************************************************************
 * Copyright (c) 2008 Borland Software Corporation
 * 
 * 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:
 *     Borland Software Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.m2m.internal.qvt.oml.blackbox.java;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.common.EMFPlugin;
import org.eclipse.emf.common.util.BasicDiagnostic;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EOperation;
import org.eclipse.m2m.internal.qvt.oml.NLS;
import org.eclipse.m2m.internal.qvt.oml.QvtPlugin;
import org.eclipse.m2m.internal.qvt.oml.ast.binding.ASTBindingHelper;
import org.eclipse.m2m.internal.qvt.oml.ast.env.QvtOperationalModuleEnv;
import org.eclipse.m2m.internal.qvt.oml.blackbox.AbstractBlackboxProvider;
import org.eclipse.m2m.internal.qvt.oml.blackbox.AbstractCompilationUnitDescriptor;
import org.eclipse.m2m.internal.qvt.oml.blackbox.BlackboxException;
import org.eclipse.m2m.internal.qvt.oml.blackbox.CompilationUnit;
import org.eclipse.m2m.internal.qvt.oml.blackbox.LoadContext;
import org.eclipse.m2m.internal.qvt.oml.blackbox.ResolutionContext;
import org.eclipse.m2m.internal.qvt.oml.cst.CSTFactory;
import org.eclipse.m2m.internal.qvt.oml.expressions.Module;


public class JavaBlackboxProvider extends AbstractBlackboxProvider {
	
	private static final String PROVIDER_ID = "Java"; //$NON-NLS-1$
	
	private static final String EXTENSION_POINT = "javaBlackboxUnits"; //$NON-NLS-1$
	
	private static final String CLASS_NAME_SEPARATOR = "."; //$NON-NLS-1$
	
	private static final String UNIT_ELEM = "unit";	//$NON-NLS-1$
	private static final String LIBRARY_ELEM = "library"; //$NON-NLS-1$	
	private static final String CLASS_ATTR = "class"; //$NON-NLS-1$
	private static final String NAME_ATTR = "name";	//$NON-NLS-1$
	private static final String NAMESPACE_ATTR = "namespace"; //$NON-NLS-1$
	private static final String DESC_ATTR = "description"; //$NON-NLS-1$

	private static final String METAMODEL_ELEM = "metamodel"; //$NON-NLS-1$
	private static final String NSURI_ATTR = "nsURI"; //$NON-NLS-1$	
		
	private Map<String, Descriptor> fDescriptorMap;
	
	private static final String ECORE_METAMODEL_URI = "http://www.eclipse.org/emf/2002/Ecore";
	
	public JavaBlackboxProvider() {
		if(EMFPlugin.IS_ECLIPSE_RUNNING) {
			fDescriptorMap = readDescriptors();
		} else {
			fDescriptorMap = new HashMap<String, Descriptor>();
		}
	}

	@Override
	public AbstractCompilationUnitDescriptor getModuleDescriptor(String qualifiedName, ResolutionContext resolutionContext) {
		// TODO - Should we necessarily be available in all contexts ? 
		return fDescriptorMap.get(qualifiedName);
	}
	
	@Override
	protected String getProviderID() {
		return PROVIDER_ID;
	}	

	@Override
	public List<AbstractCompilationUnitDescriptor> getModuleDescriptors(ResolutionContext resolutionContext) {
		// TODO - Should we necessarily be available in all contexts ?
		ArrayList<AbstractCompilationUnitDescriptor> result = new ArrayList<AbstractCompilationUnitDescriptor>(fDescriptorMap.size());
		result.addAll(fDescriptorMap.values());
		return Collections.unmodifiableList(result);
	}

	@Override
	public CompilationUnit loadCompilationUnit(AbstractCompilationUnitDescriptor descriptor, LoadContext loadContext) throws BlackboxException {
		if(descriptor instanceof Descriptor == false) {
			throw new IllegalArgumentException("Invalid descriptor"); //$NON-NLS-1$
		}

		Descriptor libDescriptor = (Descriptor) descriptor;
		JavaModuleLoader javaModuleLoader = createJavaModuleLoader();

		BasicDiagnostic errors = null;
		List<QvtOperationalModuleEnv> loadedModules = new LinkedList<QvtOperationalModuleEnv>();
		
		for (ModuleHandle nextModuleHandle : libDescriptor.fModules) {
			Diagnostic diagnostic = javaModuleLoader.loadModule(nextModuleHandle);
			
			if(DiagnosticUtil.isSuccess(diagnostic)) {
				QvtOperationalModuleEnv nextModuleEnv = javaModuleLoader.getLoadedModule();
				nextModuleEnv.getTypeResolver().getResource().setURI(descriptor.getURI());
				loadedModules.add(nextModuleEnv);
				
				if(diagnostic.getSeverity() != Diagnostic.OK) {
					QvtPlugin.logDiagnostic(diagnostic);
				}
			} else {
				if(errors == null) {
					String message = NLS.bind(JavaBlackboxMessages.BlackboxUnitLoadFailed, descriptor.getQualifiedName());
					errors = DiagnosticUtil.createErrorDiagnostic(message);
				}
				
				errors.add(diagnostic);
			}
		}
		
		if(errors != null) {
			assert errors.getSeverity() == Diagnostic.ERROR;
			throw new BlackboxException(errors);
		}

		return createCompilationUnit(loadedModules);
	}

	private JavaModuleLoader createJavaModuleLoader() {
		return new JavaModuleLoader() {
			JavaMethodHandlerFactory handlerFactory;		
			@Override
			protected void loadModule(QvtOperationalModuleEnv moduleEnv, final Class<?> javaModuleClass) {
				handlerFactory = new JavaMethodHandlerFactory(moduleEnv.getOCLStandardLibrary());
				
				Module module = moduleEnv.getModuleContextType();
				// FIXME - workaround to make Environment available with the module for
				// non-transformation execution context
				ASTBindingHelper.createCST2ASTBinding(CSTFactory.eINSTANCE.createLibraryCS(), module, moduleEnv);		

				setInstanceAdapterFactory(module, createInstanceAdapterFactory(javaModuleClass));
			}
			
			@Override
			protected void loadOperation(EOperation operation, Method javaOperation) {
				setOperationHandler(operation, handlerFactory.createHandler(javaOperation), true);
			}
		};
	}

	static InstanceAdapterFactory createInstanceAdapterFactory(final Class<?> javaModuleClass) {
		return new InstanceAdapterFactory() {												
			public Object createAdapter(EObject moduleInstance) {
				try {
					return javaModuleClass.newInstance();
				} catch (InstantiationException e) {
					// FIXME - choose a better exception
					throw new IllegalArgumentException("Illegal adapter instance", e);								 //$NON-NLS-1$
				} catch (IllegalAccessException e) {
					// FIXME - choose a better exception
					throw new IllegalArgumentException("Illegal adapter instance", e); //$NON-NLS-1$
				}
			}
		};
	}
		
    private Map<String, Descriptor> readDescriptors() {
    	Map<String, Descriptor> providers = new HashMap<String, Descriptor>();
        
        IConfigurationElement[] configs = Platform.getExtensionRegistry()
        		.getConfigurationElementsFor(QvtPlugin.ID, EXTENSION_POINT);

        for (IConfigurationElement element : configs) {
            try {
            	Descriptor descriptor = createDescriptor(element);
        		String id = descriptor.getQualifiedName();            	
            	if(!providers.containsKey(id)) {
					providers.put(id, descriptor);
            	} else {
            		String message = NLS.bind(JavaBlackboxMessages.UnitAlreadyRegisteredContributionIgnored, id, descriptor.getContributorId());
					QvtPlugin.error(message);
            	}
            } catch (IllegalArgumentException e) {
            	QvtPlugin.error("Failed to read java black-box definition: " + e.getMessage()); //$NON-NLS-1$
            }
        }

        return providers;
    }
        
    
	private Descriptor createDescriptor(IConfigurationElement configurationElement) throws IllegalArgumentException {
		if(UNIT_ELEM.equals(configurationElement.getName())) {
			String name = configurationElement.getAttribute(NAME_ATTR);
			String namespace = configurationElement.getAttribute(NAMESPACE_ATTR);		
			if(namespace == null) {
				configurationElement.getContributor().getName();
			}
			
			String description = configurationElement.getAttribute(DESC_ATTR);		
			String qualifiedName = namespace + CLASS_NAME_SEPARATOR + name;
			return new Descriptor(configurationElement, qualifiedName, description);
		} else if(LIBRARY_ELEM.equals(configurationElement.getName())) {
			return new Descriptor(configurationElement, deriveQualifiedNameFromSimpleDefinition(configurationElement), null);
		}
		
		throw new IllegalArgumentException("Unsupported configuration element " + configurationElement); //$NON-NLS-1$		
	}
    		
	private static String getPackageNameFromJavaClass(String className) {
		int lastSeparatorPos = className.lastIndexOf(CLASS_NAME_SEPARATOR);
		if(lastSeparatorPos < 0) {
			return null;
		}

		return className.substring(0, lastSeparatorPos);
	}
	
	private static String deriveQualifiedNameFromSimpleDefinition(IConfigurationElement moduleElement) {
		String className = moduleElement.getAttribute(CLASS_ATTR);		
		String name = moduleElement.getAttribute(NAME_ATTR);				
		if(name == null) {
			return className;
		}
		// name overridden in descriptor
		String packageName = getPackageNameFromJavaClass(className);
		if(packageName == null) {
			return name; // default package
		}
		return packageName + CLASS_NAME_SEPARATOR + name;
	}	
	
	 public void addDescriptor(String javaLibQualifiedName){		
		
	     	List<String> namespaceUris= new ArrayList<String>();
	     	// assume that's the unique possible case
	     	namespaceUris.add(ECORE_METAMODEL_URI);
	     	
		Descriptor descriptor = new Descriptor(javaLibQualifiedName,namespaceUris);
		String id = descriptor.getQualifiedName(); 

		fDescriptorMap.put(id, descriptor);
	    }
	 
	private class Descriptor extends AbstractCompilationUnitDescriptor {		
		private List<ModuleHandle> fModules = Collections.emptyList();
		private String fContributingBundleId; 

		Descriptor(IConfigurationElement configurationElement, String unitQualifiedName, String description) {
			super(JavaBlackboxProvider.this, unitQualifiedName, 
					//configurationElement.getContributor().getName(), 
					unitQualifiedName);
			fContributingBundleId = configurationElement.getContributor().getName();
			
			if(configurationElement.getName().equals(LIBRARY_ELEM)) {
				addModuleHandle(configurationElement);				
			} else {
				IConfigurationElement[] libraries = configurationElement.getChildren(LIBRARY_ELEM);			
				for (IConfigurationElement moduleElement : libraries) {
					addModuleHandle(moduleElement);
				}
			}
		}
		
		Descriptor(String unitQualifiedName, List<String> nsURIs) {
			super(JavaBlackboxProvider.this, unitQualifiedName, unitQualifiedName);
			
			fContributingBundleId = unitQualifiedName;

			addModuleHandle(unitQualifiedName, unitQualifiedName, unitQualifiedName,nsURIs);					
		}
		

		String getContributorId() {
			return fContributingBundleId;
		}
		
		private void addModuleHandle(IConfigurationElement moduleElement) {
			if(fModules.isEmpty()) {
				fModules = new LinkedList<ModuleHandle>();
			}
			
			String bundleId = moduleElement.getContributor().getName();
			String className = moduleElement.getAttribute(CLASS_ATTR);
			String moduleName = moduleElement.getAttribute(NAME_ATTR);
			if(moduleName == null) {
				// derive the name from the java class name
				moduleName = getSimpleNameFromJavaClass(className);
			}
			
			ModuleHandle moduleHandle = new BundleModuleHandle(bundleId, className, moduleName, readUsedPackagesNsURIs(moduleElement));
			fModules.add(moduleHandle);
		}
		
		private void addModuleHandle(String bundleId, String className, String moduleName,List<String> namespaceUris) {
			if(fModules.isEmpty()) {
				fModules = new LinkedList<ModuleHandle>();
			}
			
			if(moduleName == null) {
				// derive the name from the java class name
				moduleName = getSimpleNameFromJavaClass(className);
			}
			ModuleHandle moduleHandle = new BundleModuleHandle(bundleId, className, moduleName, namespaceUris);
			fModules.add(moduleHandle);
		}
		
		private List<String> readUsedPackagesNsURIs(IConfigurationElement moduleConfigElement) {
			ArrayList<String> uris = new ArrayList<String>(3);
			for (IConfigurationElement nextElement : moduleConfigElement.getChildren(METAMODEL_ELEM)) {
				String nsURI = nextElement.getAttribute(NSURI_ATTR);
				if(nsURI != null) {
					uris.add(nsURI);
				}
			}
			
			return uris;
		}
		
		private String getSimpleNameFromJavaClass(String className) {
			int lastSeparatorPos = className.lastIndexOf(CLASS_NAME_SEPARATOR);
			if(lastSeparatorPos < 0) {
				return className;
			}

			return className.substring(lastSeparatorPos + 1);
		}		
	}

}

/*******************************************************************************
 * Copyright (c) 2008 Borland Software Corporation
 * 
 * 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:
 *     Borland Software Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.m2m.internal.qvt.oml.blackbox;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.common.EMFPlugin;
import org.eclipse.m2m.internal.qvt.oml.QvtPlugin;
import org.eclipse.m2m.internal.qvt.oml.blackbox.java.JavaBlackboxProvider;

/*
 * TODO - handle collisions of multiple descriptors of the same qualified name
 */
public class BlackboxRegistry {
	
	private static final String CLASS_ATTR = "class"; //$NON-NLS-1$

	private static final String PROVIDER_ELEMENT = "provider"; //$NON-NLS-1$

	private static final String BLACKBOX_PROVIDER_EXTENSION = "blackboxProvider"; //$NON-NLS-1$

	public static BlackboxRegistry INSTANCE = new BlackboxRegistry();

	// instance fields
	private List<AbstractBlackboxProvider> fProviders;
		
	private BlackboxRegistry() {
		try {
			if(EMFPlugin.IS_ECLIPSE_RUNNING) {
				fProviders = Eclipse.readProviders();
			} else {
				fProviders = new ArrayList<AbstractBlackboxProvider>();
			}
		} catch (RuntimeException e) {
			fProviders = Collections.emptyList();
			QvtPlugin.error(e);
		}
	}
		
	public AbstractCompilationUnitDescriptor getCompilationUnitDescriptor(String qualifiedName, ResolutionContext context) {
		for (AbstractBlackboxProvider provider : fProviders) {
			AbstractCompilationUnitDescriptor descriptor = provider.getModuleDescriptor(qualifiedName, context);
			if(descriptor != null) {
				return descriptor;
			}
		}
		
		return null;
	}
	
	public CompilationUnit loadCompilationUnit(AbstractCompilationUnitDescriptor descriptor, LoadContext loadContext) throws BlackboxException {
		if(descriptor == null) {
			throw new IllegalArgumentException("Null blackbox descriptor"); //$NON-NLS-1$
		}
		
		AbstractBlackboxProvider provider = descriptor.getProvider();
		return provider.loadCompilationUnit(descriptor, loadContext);
	}
		
	public List<AbstractCompilationUnitDescriptor> getCompilationUnitDescriptors(ResolutionContext loadContext) {
		ArrayList<AbstractCompilationUnitDescriptor> result = new ArrayList<AbstractCompilationUnitDescriptor>();
		
		for (AbstractBlackboxProvider provider : fProviders) {
			for (AbstractCompilationUnitDescriptor abstractCompilationUnitDescriptor : provider.getModuleDescriptors(loadContext)) {
				result.add(abstractCompilationUnitDescriptor);
			}
		}
		
		return result;
	}

	public void addJavaBlackBoxProvider(String javaLibQualifiedName) {	    
	      	JavaBlackboxProvider provider = new JavaBlackboxProvider();		    	
	    	provider.addDescriptor(javaLibQualifiedName);	 
	    	
	    	fProviders.add((AbstractBlackboxProvider)provider);
	}
	
	private static class Eclipse {
	    private static List<AbstractBlackboxProvider> readProviders() {
	        List<AbstractBlackboxProvider> providers = new LinkedList<AbstractBlackboxProvider>();
	        
	        IConfigurationElement[] configs =
	            Platform.getExtensionRegistry().getConfigurationElementsFor(
	                QvtPlugin.ID, BLACKBOX_PROVIDER_EXTENSION);
	
	        for (IConfigurationElement element : configs) {
	            if (element.getName().equals(PROVIDER_ELEMENT)) {
	                try {
	                	Object extension = element.createExecutableExtension(CLASS_ATTR);
	                	if(extension instanceof AbstractBlackboxProvider == false) {
	                		QvtPlugin.error("Provider must implement AbstractBlackboxProvider interace: " + extension); //$NON-NLS-1$
	                		continue;
	                	}
	
	                	providers.add((AbstractBlackboxProvider)extension);
	                } catch (CoreException e) {
	                    QvtPlugin.getDefault().log(e.getStatus());
	                }
	            }
	        }
	        
	        return providers;
	    }
	}
}

/*******************************************************************************
 * Copyright (c) 2009 Borland Software Corporation
 * 
 * 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:
 *     Borland Software Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.m2m.internal.qvt.oml.compiler;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.emf.common.util.BasicDiagnostic;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage.Registry;
import org.eclipse.m2m.internal.qvt.oml.NLS;
import org.eclipse.m2m.internal.qvt.oml.QvtPlugin;
import org.eclipse.m2m.internal.qvt.oml.ast.binding.ASTBindingHelper;
import org.eclipse.m2m.internal.qvt.oml.ast.env.QvtOperationalModuleEnv;
import org.eclipse.m2m.internal.qvt.oml.ast.parser.QvtOperationalParserUtil;
import org.eclipse.m2m.internal.qvt.oml.ast.parser.ValidationMessages;
import org.eclipse.m2m.internal.qvt.oml.blackbox.AbstractCompilationUnitDescriptor;
import org.eclipse.m2m.internal.qvt.oml.blackbox.BlackboxException;
import org.eclipse.m2m.internal.qvt.oml.blackbox.BlackboxRegistry;
import org.eclipse.m2m.internal.qvt.oml.blackbox.CompilationUnit;
import org.eclipse.m2m.internal.qvt.oml.blackbox.LoadContext;
import org.eclipse.m2m.internal.qvt.oml.blackbox.ResolutionContext;
import org.eclipse.m2m.internal.qvt.oml.blackbox.ResolutionContextImpl;
import org.eclipse.m2m.internal.qvt.oml.compiler.UnitContents.ModelContents;
import org.eclipse.m2m.internal.qvt.oml.expressions.Module;

public class BlackboxUnitResolver implements UnitResolver {
	
	// the global scope black-box resolver
	public static final BlackboxUnitResolver DEFAULT = new BlackboxUnitResolver(URI.createURI("/")); //$NON-NLS-1$
	
	private ResolutionContext fContext;
	
	public BlackboxUnitResolver(URI context) {
		fContext = new ResolutionContextImpl(context);		
	}
	
	public static boolean isBlackboxUnitURI(URI uri) {
		return AbstractCompilationUnitDescriptor.URI_SCHEME.equals(uri.scheme()) && 
			AbstractCompilationUnitDescriptor.URI_AUTHORITY.equals(uri.authority());
	}
	
	public static UnitProxy getUnit(URI uri) {
    	if(isBlackboxUnitURI(uri) && uri.segmentCount() > 0) {
    		// TODO - use 1st segment as provider ID to be used in library ID clash resolution
			String id = uri.lastSegment();											
			return BlackboxUnitResolver.DEFAULT.resolveUnit(id);
    	}
    	return null;
	}
	
	public UnitProxy resolveUnit(String qualifiedName) {
		
		BlackboxRegistry.INSTANCE.addJavaBlackBoxProvider(qualifiedName);
		AbstractCompilationUnitDescriptor descriptor = BlackboxRegistry.INSTANCE.getCompilationUnitDescriptor(qualifiedName, fContext);
		
		if (descriptor != null) {
			int namePos = qualifiedName.lastIndexOf('.');
			String name;
			String namespace;
			if(namePos > 0) {
				namespace = qualifiedName.substring(0, namePos);
				
				if(namePos + 1 < qualifiedName.length()) {
					++namePos;
				}
				name = qualifiedName.substring(namePos);

			} else {
				name = qualifiedName;
				namespace = null;
			}
			
			return new BBoxUnit(namespace, name, descriptor);
		}

		return null;
	}


	class BBoxUnit extends UnitProxy {

		private AbstractCompilationUnitDescriptor fDescriptor;
		
		BBoxUnit(String namespace, String name, AbstractCompilationUnitDescriptor descriptor) {
			super(namespace, name, descriptor.getURI());
			
			fDescriptor = descriptor;
		}

		@Override
		public int getContentType() {
			return UnitProxy.TYPE_MODEL;
		}
		
		@Override
		public UnitContents getContents() throws IOException {
			return new BBoxUnitContents(fDescriptor);
		}

		@Override
		public UnitResolver getResolver() {
			return BlackboxUnitResolver.this;
		}
	}
	
	class BBoxUnitContents implements ModelContents {
		
		private AbstractCompilationUnitDescriptor fDescriptor;
		private Diagnostic fProblems;
		
		
		BBoxUnitContents(AbstractCompilationUnitDescriptor descriptor) {
			assert descriptor != null;
			fDescriptor = descriptor;
		}
				
		public Diagnostic getProblems() {
			return fProblems;
		}
		
		public List<EObject> loadElements(Registry packageRegistry) {
			LoadContext loadContext = new LoadContext(packageRegistry);
			CompilationUnit cunit = null;
			try {
				cunit = BlackboxRegistry.INSTANCE.loadCompilationUnit(fDescriptor, loadContext);
			} catch (BlackboxException e) {
				Diagnostic diagnostic = e.getDiagnostic();
				if(diagnostic != null) {
					QvtPlugin.logDiagnostic(diagnostic);					
				} else {
					QvtPlugin.error(NLS.bind(ValidationMessages.FailedToLoadUnit, 
							new Object[] { fDescriptor.getQualifiedName() }), e);
				}

				String errMessage = NLS.bind(ValidationMessages.FailedToLoadUnit, fDescriptor.getQualifiedName());
				fProblems = new BasicDiagnostic(diagnostic.getSource(), diagnostic.getCode(), 
						QvtOperationalParserUtil.wrappInSeeErrorLogMessage(errMessage), null);
			}
			
			if(cunit == null) {
				return Collections.emptyList();
			}
			
			List<QvtOperationalModuleEnv> elementEnvs = cunit.getElements();			
			List<EObject> unitElements = new ArrayList<EObject>(elementEnvs.size());
						
			for (QvtOperationalModuleEnv nextEnv : elementEnvs) {
				Module module = nextEnv.getModuleContextType();
				if(module != null) {
					unitElements.add(module);
					ASTBindingHelper.setEnvironment(module, nextEnv);					
				}
			}

			return unitElements;   
		}
	}
	
}

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