plugins/org.eclipse.sphinx.xtendxpand/src/org/eclipse/sphinx/xtendxpand/jobs/XtendJob.java - sphinx/org.eclipse.sphinx - Git at Google

 /**
  * <copyright>
  *
  * Copyright (c) 2011-2017 See4sys, itemis 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
  * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
  *
  * Contributors:
  *     See4sys - Initial API and implementation
  *     itemis - [343844] Enable multiple Xtend MetaModels to be configured on BasicM2xAction, M2xConfigurationWizard, and Xtend/Xpand/CheckJob
  *     itemis - [357813] Risk of NullPointerException when transforming models using M2MConfigurationWizard
  *     itemis - [358082] Precedence of Xtend MetaModels gets lost in Xtend/Xpand runtime enhancements implemented in Sphinx
  *     itemis - [358131] Make Xtend/Xpand/CheckJobs more robust against template file encoding mismatches
  *     itemis - Eliminated usage of deprecated WorkspaceTransactionUtil#executeInWriteTransaction() method variant
  *
  * </copyright>
  */
 package org.eclipse.sphinx.xtendxpand.jobs;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.eclipse.core.commands.operations.IOperationHistory;
 import org.eclipse.core.commands.operations.IUndoableOperation;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.emf.mwe.core.monitor.ProgressMonitorAdapter;
 import org.eclipse.emf.mwe.core.resources.ResourceLoaderFactory;
 import org.eclipse.emf.transaction.TransactionalEditingDomain;
 import org.eclipse.emf.transaction.util.TransactionUtil;
 import org.eclipse.sphinx.emf.model.IModelDescriptor;
 import org.eclipse.sphinx.emf.model.ModelDescriptorRegistry;
 import org.eclipse.sphinx.emf.mwe.IXtendXpandConstants;
 import org.eclipse.sphinx.emf.mwe.resources.IWorkspaceResourceLoader;
 import org.eclipse.sphinx.emf.util.EcorePlatformUtil;
 import org.eclipse.sphinx.emf.util.WorkspaceTransactionUtil;
 import org.eclipse.sphinx.platform.IExtendedPlatformConstants;
 import org.eclipse.sphinx.platform.util.StatusUtil;
 import org.eclipse.sphinx.xtendxpand.XtendEvaluationRequest;
 import org.eclipse.sphinx.xtendxpand.internal.Activator;
 import org.eclipse.sphinx.xtendxpand.util.XtendXpandUtil;
 import org.eclipse.xpand2.XpandUtil;
 import org.eclipse.xtend.XtendFacade;
 import org.eclipse.xtend.expression.ExecutionContextImpl;
 import org.eclipse.xtend.expression.ResourceManager;
 import org.eclipse.xtend.expression.ResourceManagerDefaultImpl;
 import org.eclipse.xtend.expression.TypeSystem;
 import org.eclipse.xtend.expression.TypeSystemImpl;
 import org.eclipse.xtend.expression.Variable;
 import org.eclipse.xtend.typesystem.MetaModel;

 public class XtendJob extends Job {

 	protected static final Log log = LogFactory.getLog(XtendJob.class);

 	/**
 	 * The {@link MetaModel metamodel}s behind the model(s) to be transformed.
 	 *
 	 * @see MetaModel
 	 */
 	protected List<MetaModel> metaModels = null;

 	/**
 	 * The {@link TypeSystem} including the {@link MetaModel metamodel}s behind the model(s) to be transformed.
 	 */
 	protected TypeSystem typeSystem = null;

 	/**
 	 * The collection of {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
 	 *
 	 * @see XtendEvaluationRequest
 	 */
 	protected Collection<XtendEvaluationRequest> xtendEvaluationRequests;

 	/**
 	 * The resource loader to be used when loading Xtend templates.
 	 */
 	private IWorkspaceResourceLoader workspaceResourceLoader;

 	/**
 	 * The label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
 	 */
 	private String operationLabel = null;

 	/**
 	 * The options to set the Xtend transformation transaction.
 	 */
 	private Map<String, Object> transactionOptions = null;

 	/**
 	 * The Xtend transformation result.
 	 */
 	protected Map<Object, Collection<?>> resultObjects = new HashMap<Object, Collection<?>>();

 	/**
 	 * Creates an {@link XtendJob} that transforms a model based on given <code>metaModel</code> as specified by
 	 * provided <code>xtendEvaluationRequest</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param metaModel
 	 *            The {@link MetaModel metamodel} to be used.
 	 * @param xtendEvaluationRequest
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
 	 * @see MetaModel
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, MetaModel metaModel, XtendEvaluationRequest xtendEvaluationRequest) {
 		this(name, Collections.singletonList(metaModel), Collections.singleton(xtendEvaluationRequest));
 	}

 	/**
 	 * Creates an {@link XtendJob} that transforms one or several models based on given <code>metaModel</code> as
 	 * specified by provided <code>xtendEvaluationRequests</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param metaModel
 	 *            The {@link MetaModel metamodel} to be used.
 	 * @param xtendEvaluationRequests
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
 	 * @see MetaModel
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, MetaModel metaModel, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
 		this(name, Collections.singletonList(metaModel), xtendEvaluationRequests);
 	}

 	/**
 	 * Creates an {@link XtendJob} that transforms a model based on given <code>metaModels</code> as specified by
 	 * provided <code>xtendEvaluationRequest</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param metaModels
 	 *            The {@link MetaModel metamodel}s to be used.
 	 * @param xtendEvaluationRequest
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
 	 * @see MetaModel
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, List<MetaModel> metaModels, XtendEvaluationRequest xtendEvaluationRequest) {
 		this(name, metaModels, Collections.singleton(xtendEvaluationRequest));
 	}

 	/**
 	 * Creates an {@link XtendJob} that transforms one or several models based on given <code>metaModels</code> as
 	 * specified by provided <code>xtendEvaluationRequests</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param metaModels
 	 *            The {@link MetaModel metamodel}s to be used.
 	 * @param xtendEvaluationRequests
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
 	 * @see MetaModel
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, List<MetaModel> metaModels, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
 		super(name);

 		Assert.isNotNull(metaModels);
 		Assert.isNotNull(xtendEvaluationRequests);

 		this.metaModels = metaModels;
 		this.xtendEvaluationRequests = xtendEvaluationRequests;
 	}

 	/**
 	 * Creates an {@link XtendJob} that transforms a model based on given <code>typeSystem</code> as specified by
 	 * provided <code>xtendEvaluationRequest</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param typeSystem
 	 *            The {@link TypeSystem type system} that includes the {@link MetaModel metamodel}s to be used.
 	 * @param xtendEvaluationRequest
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
 	 * @see TypeSystem
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, TypeSystem typeSystem, XtendEvaluationRequest xtendEvaluationRequest) {
 		this(name, typeSystem, Collections.singleton(xtendEvaluationRequest));
 	}

 	/**
 	 * Creates an {@link XtendJob} that transforms one or several models based on given <code>typeSystem</code> as
 	 * specified by provided <code>xtendEvaluationRequests</code>.
 	 *
 	 * @param name
 	 *            The name of the job.
 	 * @param typeSystem
 	 *            The {@link TypeSystem type system} that includes the {@link MetaModel metamodel}s to be used.
 	 * @param xtendEvaluationRequests
 	 *            The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
 	 * @see TypeSystem
 	 * @see XtendEvaluationRequest
 	 */
 	public XtendJob(String name, TypeSystem typeSystem, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
 		super(name);

 		Assert.isNotNull(typeSystem);
 		Assert.isNotNull(xtendEvaluationRequests);

 		this.typeSystem = typeSystem;
 		this.xtendEvaluationRequests = xtendEvaluationRequests;
 	}

 	protected Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> getXtendEvaluationRequests() {
 		Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> requests = new HashMap<TransactionalEditingDomain, Collection<XtendEvaluationRequest>>();
 		for (XtendEvaluationRequest request : xtendEvaluationRequests) {
 			TransactionalEditingDomain editingDomain = TransactionUtil.getEditingDomain(request.getTargetObject());
 			Collection<XtendEvaluationRequest> requestsInEditingDomain = requests.get(editingDomain);
 			if (requestsInEditingDomain == null) {
 				requestsInEditingDomain = new HashSet<XtendEvaluationRequest>();
 				requests.put(editingDomain, requestsInEditingDomain);
 			}
 			requestsInEditingDomain.add(request);
 		}
 		return requests;
 	}

 	/**
 	 * Sets the {@link IWorkspaceResourceLoader resource loader} for resolving resources referenced by Xtend extensions.
 	 *
 	 * @param resourceLoader
 	 *            The resource loader to be used.
 	 */
 	public void setWorkspaceResourceLoader(IWorkspaceResourceLoader resourceLoader) {
 		workspaceResourceLoader = resourceLoader;
 	}

 	/**
 	 * Returns the label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
 	 *
 	 * @return The operation label for the Xtend transformation.
 	 * @see #setOperationLabel(String)
 	 */
 	protected String getOperationLabel() {
 		if (operationLabel == null) {
 			// Retrieve operation label from job name
 			operationLabel = getName();
 		}
 		return operationLabel;
 	}

 	/**
 	 * Sets the label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
 	 *
 	 * @param operationLabel
 	 *            The operation label for the Xtend transformation.
 	 */
 	public void setOperationLabel(String operationLabel) {
 		this.operationLabel = operationLabel;
 	}

 	/**
 	 * Returns the IOperationHistory for the given <code>editingDomain</code>.
 	 *
 	 * @param editingDomain
 	 *            The EditingDomain for which the {@link IOperationHistory operation history} is to be retrieved.
 	 * @return The {@link IOperationHistory operation history} of the given <code>editingDomain</code>.
 	 */
 	protected IOperationHistory getOperationHistory(TransactionalEditingDomain editingDomain) {
 		return WorkspaceTransactionUtil.getOperationHistory(editingDomain);
 	}

 	/**
 	 * Returns the options to use in the Xtend transformation transaction. If no transaction options are specified
 	 * {@link WorkspaceTransactionUtil#getDefaultTransactionOptions()} are used as default.
 	 *
 	 * @return The options to use in the Xtend transformation transaction.
 	 * @see #setTransactionOptions(Map)
 	 */
 	protected Map<String, Object> getTransactionOptions() {
 		if (transactionOptions == null) {
 			transactionOptions = WorkspaceTransactionUtil.getDefaultTransactionOptions();
 		}
 		return transactionOptions;
 	}

 	/**
 	 * Sets the options to be used in the Xtend transformation transaction.
 	 *
 	 * @param transactionOptions
 	 *            The transaction options to be used.
 	 */
 	public void setTransactionOptions(Map<String, Object> transactionOptions) {
 		this.transactionOptions = transactionOptions;
 	}

 	@Override
 	public IStatus run(IProgressMonitor monitor) {
 		try {
 			if (xtendEvaluationRequests.isEmpty()) {
 				return Status.CANCEL_STATUS;
 			}

 			// Log start of transformation
 			log.info("Xtend started..."); //$NON-NLS-1$

 			// Install resource loader
 			installResourceLoader();

 			// Create execution context
 			final ResourceManager resourceManager = new ResourceManagerDefaultImpl();
 			Map<String, Variable> variables = new HashMap<String, Variable>();
 			Map<String, Variable> globalVarsMap = new HashMap<String, Variable>();
 			final ExecutionContextImpl execCtx = new ExecutionContextImpl(resourceManager, null,
 					typeSystem instanceof TypeSystemImpl ? (TypeSystemImpl) typeSystem : new TypeSystemImpl(), variables, globalVarsMap,
 					new ProgressMonitorAdapter(monitor), null, null, null, null, null, null, null);
 			if (metaModels != null) {
 				for (MetaModel metaModel : metaModels) {
 					execCtx.registerMetaModel(metaModel);
 				}
 			}

 			// Execute transformation
 			long startTime = System.currentTimeMillis();
 			final Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> requests = getXtendEvaluationRequests();
 			for (final TransactionalEditingDomain editingDomain : requests.keySet()) {

 				Runnable runnable = new Runnable() {
 					@Override
 					public void run() {
 						for (XtendEvaluationRequest request : requests.get(editingDomain)) {
 							log.info("Xtend transformation for " + request.getTargetObject() + " with '" + request.getExtensionName() + "'"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

 							// Update resource loader context
 							updateResourceLoaderContext(request.getTargetObject());

 							// Update resource manager with file encoding information for next Xtend file to be
 							// evaluated
 							IFile extensionFile = XtendXpandUtil.getUnderlyingFile(request.getExtensionName(),
 									IXtendXpandConstants.EXTENSION_EXTENSION, workspaceResourceLoader);
 							if (extensionFile != null) {
 								try {
 									resourceManager.setFileEncoding(extensionFile.getCharset());
 								} catch (CoreException ex) {
 									// Ignore exception
 								}
 							}

 							// Evaluate current request
 							XtendFacade facade = XtendFacade.create(execCtx, XpandUtil.withoutLastSegment(request.getExtensionName()));
 							List<Object> parameterList = new ArrayList<Object>();
 							parameterList.add(request.getTargetObject());
 							parameterList.addAll(request.getParameterList());
 							Object result = facade.call(XpandUtil.getLastSegment(request.getExtensionName()), parameterList);
 							if (result != null) {
 								if (result instanceof Collection) {
 									resultObjects.put(request.getTargetObject(), (Collection<?>) result);
 								} else if (result instanceof Object[]) {
 									resultObjects.put(request.getTargetObject(), Arrays.asList((Object[]) result));
 								} else {
 									resultObjects.put(request.getTargetObject(), Collections.singleton(result));
 								}
 							}
 						}
 					}
 				};

 				if (editingDomain != null) {
 					WorkspaceTransactionUtil.executeInWriteTransaction(editingDomain, runnable, getOperationLabel(),
 							getOperationHistory(editingDomain), getTransactionOptions());
 				} else {
 					runnable.run();
 				}
 			}
 			long duration = System.currentTimeMillis() - startTime;

 			// Log end of transformation
 			log.info("Xtend completed in " + duration + "ms!"); //$NON-NLS-1$ //$NON-NLS-2$
 			return Status.OK_STATUS;
 		} catch (OperationCanceledException exception) {
 			return Status.CANCEL_STATUS;
 		} catch (Exception ex) {
 			return StatusUtil.createErrorStatus(Activator.getPlugin(), ex);
 		} finally {
 			// Always uninstall resource loader again
 			uninstallResourceLoader();
 		}
 	}

 	/**
 	 * Installs a {@link IWorkspaceResourceLoader resource loader}.
 	 */
 	protected void installResourceLoader() {
 		if (workspaceResourceLoader == null) {
 			if (ResourceLoaderFactory.getCurrentThreadResourceLoader() instanceof IWorkspaceResourceLoader) {
 				workspaceResourceLoader = (IWorkspaceResourceLoader) ResourceLoaderFactory.getCurrentThreadResourceLoader();
 			}
 		} else {
 			ResourceLoaderFactory.setCurrentThreadResourceLoader(workspaceResourceLoader);
 		}
 	}

 	/**
 	 * Updates context of current {@link IWorkspaceResourceLoader resource loader} according to given
 	 * <code>contextObject</code>.
 	 */
 	protected void updateResourceLoaderContext(Object contextObject) {
 		if (workspaceResourceLoader != null) {
 			IFile contextFile = EcorePlatformUtil.getFile(contextObject);
 			IModelDescriptor contextModel = ModelDescriptorRegistry.INSTANCE.getModel(contextFile);
 			if (contextModel != null) {
 				workspaceResourceLoader.setContextModel(contextModel);
 			}
 		}
 	}

 	/**
 	 * Uninstalls current {@link IWorkspaceResourceLoader resource loader}.
 	 */
 	protected void uninstallResourceLoader() {
 		ResourceLoaderFactory.setCurrentThreadResourceLoader(null);
 	}

 	/**
 	 * Returns a map with the collections of objects resulting from the Xtend model transformation keyed by the target
 	 * objects from the {@link XtendEvaluationRequest evaluation requests} that have been provided as input for the
 	 * Xtend model transformation.
 	 */
 	public Map<Object, Collection<?>> getResultObjects() {
 		return resultObjects;
 	}

 	@Override
 	public boolean belongsTo(Object family) {
 		return IExtendedPlatformConstants.FAMILY_LONG_RUNNING.equals(family);
 	}
 }
	/**
	* <copyright>
	*
	* Copyright (c) 2011-2017 See4sys, itemis 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
	* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
	*
	* Contributors:
	* See4sys - Initial API and implementation
	* itemis - [343844] Enable multiple Xtend MetaModels to be configured on BasicM2xAction, M2xConfigurationWizard, and Xtend/Xpand/CheckJob
	* itemis - [357813] Risk of NullPointerException when transforming models using M2MConfigurationWizard
	* itemis - [358082] Precedence of Xtend MetaModels gets lost in Xtend/Xpand runtime enhancements implemented in Sphinx
	* itemis - [358131] Make Xtend/Xpand/CheckJobs more robust against template file encoding mismatches
	* itemis - Eliminated usage of deprecated WorkspaceTransactionUtil#executeInWriteTransaction() method variant
	*
	* </copyright>
	*/
	package org.eclipse.sphinx.xtendxpand.jobs;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Map;

	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;
	import org.eclipse.core.commands.operations.IOperationHistory;
	import org.eclipse.core.commands.operations.IUndoableOperation;
	import org.eclipse.core.resources.IFile;
	import org.eclipse.core.runtime.Assert;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.core.runtime.jobs.Job;
	import org.eclipse.emf.mwe.core.monitor.ProgressMonitorAdapter;
	import org.eclipse.emf.mwe.core.resources.ResourceLoaderFactory;
	import org.eclipse.emf.transaction.TransactionalEditingDomain;
	import org.eclipse.emf.transaction.util.TransactionUtil;
	import org.eclipse.sphinx.emf.model.IModelDescriptor;
	import org.eclipse.sphinx.emf.model.ModelDescriptorRegistry;
	import org.eclipse.sphinx.emf.mwe.IXtendXpandConstants;
	import org.eclipse.sphinx.emf.mwe.resources.IWorkspaceResourceLoader;
	import org.eclipse.sphinx.emf.util.EcorePlatformUtil;
	import org.eclipse.sphinx.emf.util.WorkspaceTransactionUtil;
	import org.eclipse.sphinx.platform.IExtendedPlatformConstants;
	import org.eclipse.sphinx.platform.util.StatusUtil;
	import org.eclipse.sphinx.xtendxpand.XtendEvaluationRequest;
	import org.eclipse.sphinx.xtendxpand.internal.Activator;
	import org.eclipse.sphinx.xtendxpand.util.XtendXpandUtil;
	import org.eclipse.xpand2.XpandUtil;
	import org.eclipse.xtend.XtendFacade;
	import org.eclipse.xtend.expression.ExecutionContextImpl;
	import org.eclipse.xtend.expression.ResourceManager;
	import org.eclipse.xtend.expression.ResourceManagerDefaultImpl;
	import org.eclipse.xtend.expression.TypeSystem;
	import org.eclipse.xtend.expression.TypeSystemImpl;
	import org.eclipse.xtend.expression.Variable;
	import org.eclipse.xtend.typesystem.MetaModel;

	public class XtendJob extends Job {

	protected static final Log log = LogFactory.getLog(XtendJob.class);

	/**
	* The {@link MetaModel metamodel}s behind the model(s) to be transformed.
	*
	* @see MetaModel
	*/
	protected List<MetaModel> metaModels = null;

	/**
	* The {@link TypeSystem} including the {@link MetaModel metamodel}s behind the model(s) to be transformed.
	*/
	protected TypeSystem typeSystem = null;

	/**
	* The collection of {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
	*
	* @see XtendEvaluationRequest
	*/
	protected Collection<XtendEvaluationRequest> xtendEvaluationRequests;

	/**
	* The resource loader to be used when loading Xtend templates.
	*/
	private IWorkspaceResourceLoader workspaceResourceLoader;

	/**
	* The label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
	*/
	private String operationLabel = null;

	/**
	* The options to set the Xtend transformation transaction.
	*/
	private Map<String, Object> transactionOptions = null;

	/**
	* The Xtend transformation result.
	*/
	protected Map<Object, Collection<?>> resultObjects = new HashMap<Object, Collection<?>>();

	/**
	* Creates an {@link XtendJob} that transforms a model based on given <code>metaModel</code> as specified by
	* provided <code>xtendEvaluationRequest</code>.
	*
	* @param name
	* The name of the job.
	* @param metaModel
	* The {@link MetaModel metamodel} to be used.
	* @param xtendEvaluationRequest
	* The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
	* @see MetaModel
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, MetaModel metaModel, XtendEvaluationRequest xtendEvaluationRequest) {
	this(name, Collections.singletonList(metaModel), Collections.singleton(xtendEvaluationRequest));
	}

	/**
	* Creates an {@link XtendJob} that transforms one or several models based on given <code>metaModel</code> as
	* specified by provided <code>xtendEvaluationRequests</code>.
	*
	* @param name
	* The name of the job.
	* @param metaModel
	* The {@link MetaModel metamodel} to be used.
	* @param xtendEvaluationRequests
	* The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
	* @see MetaModel
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, MetaModel metaModel, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
	this(name, Collections.singletonList(metaModel), xtendEvaluationRequests);
	}

	/**
	* Creates an {@link XtendJob} that transforms a model based on given <code>metaModels</code> as specified by
	* provided <code>xtendEvaluationRequest</code>.
	*
	* @param name
	* The name of the job.
	* @param metaModels
	* The {@link MetaModel metamodel}s to be used.
	* @param xtendEvaluationRequest
	* The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
	* @see MetaModel
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, List<MetaModel> metaModels, XtendEvaluationRequest xtendEvaluationRequest) {
	this(name, metaModels, Collections.singleton(xtendEvaluationRequest));
	}

	/**
	* Creates an {@link XtendJob} that transforms one or several models based on given <code>metaModels</code> as
	* specified by provided <code>xtendEvaluationRequests</code>.
	*
	* @param name
	* The name of the job.
	* @param metaModels
	* The {@link MetaModel metamodel}s to be used.
	* @param xtendEvaluationRequests
	* The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
	* @see MetaModel
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, List<MetaModel> metaModels, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
	super(name);

	Assert.isNotNull(metaModels);
	Assert.isNotNull(xtendEvaluationRequests);

	this.metaModels = metaModels;
	this.xtendEvaluationRequests = xtendEvaluationRequests;
	}

	/**
	* Creates an {@link XtendJob} that transforms a model based on given <code>typeSystem</code> as specified by
	* provided <code>xtendEvaluationRequest</code>.
	*
	* @param name
	* The name of the job.
	* @param typeSystem
	* The {@link TypeSystem type system} that includes the {@link MetaModel metamodel}s to be used.
	* @param xtendEvaluationRequest
	* The {@link XtendEvaluationRequest Xtend evaluation request} to be processed.
	* @see TypeSystem
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, TypeSystem typeSystem, XtendEvaluationRequest xtendEvaluationRequest) {
	this(name, typeSystem, Collections.singleton(xtendEvaluationRequest));
	}

	/**
	* Creates an {@link XtendJob} that transforms one or several models based on given <code>typeSystem</code> as
	* specified by provided <code>xtendEvaluationRequests</code>.
	*
	* @param name
	* The name of the job.
	* @param typeSystem
	* The {@link TypeSystem type system} that includes the {@link MetaModel metamodel}s to be used.
	* @param xtendEvaluationRequests
	* The {@link XtendEvaluationRequest Xtend evaluation request}s to be processed.
	* @see TypeSystem
	* @see XtendEvaluationRequest
	*/
	public XtendJob(String name, TypeSystem typeSystem, Collection<XtendEvaluationRequest> xtendEvaluationRequests) {
	super(name);

	Assert.isNotNull(typeSystem);
	Assert.isNotNull(xtendEvaluationRequests);

	this.typeSystem = typeSystem;
	this.xtendEvaluationRequests = xtendEvaluationRequests;
	}

	protected Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> getXtendEvaluationRequests() {
	Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> requests = new HashMap<TransactionalEditingDomain, Collection<XtendEvaluationRequest>>();
	for (XtendEvaluationRequest request : xtendEvaluationRequests) {
	TransactionalEditingDomain editingDomain = TransactionUtil.getEditingDomain(request.getTargetObject());
	Collection<XtendEvaluationRequest> requestsInEditingDomain = requests.get(editingDomain);
	if (requestsInEditingDomain == null) {
	requestsInEditingDomain = new HashSet<XtendEvaluationRequest>();
	requests.put(editingDomain, requestsInEditingDomain);
	}
	requestsInEditingDomain.add(request);
	}
	return requests;
	}

	/**
	* Sets the {@link IWorkspaceResourceLoader resource loader} for resolving resources referenced by Xtend extensions.
	*
	* @param resourceLoader
	* The resource loader to be used.
	*/
	public void setWorkspaceResourceLoader(IWorkspaceResourceLoader resourceLoader) {
	workspaceResourceLoader = resourceLoader;
	}

	/**
	* Returns the label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
	*
	* @return The operation label for the Xtend transformation.
	* @see #setOperationLabel(String)
	*/
	protected String getOperationLabel() {
	if (operationLabel == null) {
	// Retrieve operation label from job name
	operationLabel = getName();
	}
	return operationLabel;
	}

	/**
	* Sets the label for the {@link IUndoableOperation operation} in which the Xtend transformation is executed.
	*
	* @param operationLabel
	* The operation label for the Xtend transformation.
	*/
	public void setOperationLabel(String operationLabel) {
	this.operationLabel = operationLabel;
	}

	/**
	* Returns the IOperationHistory for the given <code>editingDomain</code>.
	*
	* @param editingDomain
	* The EditingDomain for which the {@link IOperationHistory operation history} is to be retrieved.
	* @return The {@link IOperationHistory operation history} of the given <code>editingDomain</code>.
	*/
	protected IOperationHistory getOperationHistory(TransactionalEditingDomain editingDomain) {
	return WorkspaceTransactionUtil.getOperationHistory(editingDomain);
	}

	/**
	* Returns the options to use in the Xtend transformation transaction. If no transaction options are specified
	* {@link WorkspaceTransactionUtil#getDefaultTransactionOptions()} are used as default.
	*
	* @return The options to use in the Xtend transformation transaction.
	* @see #setTransactionOptions(Map)
	*/
	protected Map<String, Object> getTransactionOptions() {
	if (transactionOptions == null) {
	transactionOptions = WorkspaceTransactionUtil.getDefaultTransactionOptions();
	}
	return transactionOptions;
	}

	/**
	* Sets the options to be used in the Xtend transformation transaction.
	*
	* @param transactionOptions
	* The transaction options to be used.
	*/
	public void setTransactionOptions(Map<String, Object> transactionOptions) {
	this.transactionOptions = transactionOptions;
	}

	@Override
	public IStatus run(IProgressMonitor monitor) {
	try {
	if (xtendEvaluationRequests.isEmpty()) {
	return Status.CANCEL_STATUS;
	}

	// Log start of transformation
	log.info("Xtend started..."); //$NON-NLS-1$

	// Install resource loader
	installResourceLoader();

	// Create execution context
	final ResourceManager resourceManager = new ResourceManagerDefaultImpl();
	Map<String, Variable> variables = new HashMap<String, Variable>();
	Map<String, Variable> globalVarsMap = new HashMap<String, Variable>();
	final ExecutionContextImpl execCtx = new ExecutionContextImpl(resourceManager, null,
	typeSystem instanceof TypeSystemImpl ? (TypeSystemImpl) typeSystem : new TypeSystemImpl(), variables, globalVarsMap,
	new ProgressMonitorAdapter(monitor), null, null, null, null, null, null, null);
	if (metaModels != null) {
	for (MetaModel metaModel : metaModels) {
	execCtx.registerMetaModel(metaModel);
	}
	}

	// Execute transformation
	long startTime = System.currentTimeMillis();
	final Map<TransactionalEditingDomain, Collection<XtendEvaluationRequest>> requests = getXtendEvaluationRequests();
	for (final TransactionalEditingDomain editingDomain : requests.keySet()) {

	Runnable runnable = new Runnable() {
	@Override
	public void run() {
	for (XtendEvaluationRequest request : requests.get(editingDomain)) {
	log.info("Xtend transformation for " + request.getTargetObject() + " with '" + request.getExtensionName() + "'"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

	// Update resource loader context
	updateResourceLoaderContext(request.getTargetObject());

	// Update resource manager with file encoding information for next Xtend file to be
	// evaluated
	IFile extensionFile = XtendXpandUtil.getUnderlyingFile(request.getExtensionName(),
	IXtendXpandConstants.EXTENSION_EXTENSION, workspaceResourceLoader);
	if (extensionFile != null) {
	try {
	resourceManager.setFileEncoding(extensionFile.getCharset());
	} catch (CoreException ex) {
	// Ignore exception
	}
	}

	// Evaluate current request
	XtendFacade facade = XtendFacade.create(execCtx, XpandUtil.withoutLastSegment(request.getExtensionName()));
	List<Object> parameterList = new ArrayList<Object>();
	parameterList.add(request.getTargetObject());
	parameterList.addAll(request.getParameterList());
	Object result = facade.call(XpandUtil.getLastSegment(request.getExtensionName()), parameterList);
	if (result != null) {
	if (result instanceof Collection) {
	resultObjects.put(request.getTargetObject(), (Collection<?>) result);
	} else if (result instanceof Object[]) {
	resultObjects.put(request.getTargetObject(), Arrays.asList((Object[]) result));
	} else {
	resultObjects.put(request.getTargetObject(), Collections.singleton(result));
	}
	}
	}
	}
	};

	if (editingDomain != null) {
	WorkspaceTransactionUtil.executeInWriteTransaction(editingDomain, runnable, getOperationLabel(),
	getOperationHistory(editingDomain), getTransactionOptions());
	} else {
	runnable.run();
	}
	}
	long duration = System.currentTimeMillis() - startTime;

	// Log end of transformation
	log.info("Xtend completed in " + duration + "ms!"); //$NON-NLS-1$ //$NON-NLS-2$
	return Status.OK_STATUS;
	} catch (OperationCanceledException exception) {
	return Status.CANCEL_STATUS;
	} catch (Exception ex) {
	return StatusUtil.createErrorStatus(Activator.getPlugin(), ex);
	} finally {
	// Always uninstall resource loader again
	uninstallResourceLoader();
	}
	}

	/**
	* Installs a {@link IWorkspaceResourceLoader resource loader}.
	*/
	protected void installResourceLoader() {
	if (workspaceResourceLoader == null) {
	if (ResourceLoaderFactory.getCurrentThreadResourceLoader() instanceof IWorkspaceResourceLoader) {
	workspaceResourceLoader = (IWorkspaceResourceLoader) ResourceLoaderFactory.getCurrentThreadResourceLoader();
	}
	} else {
	ResourceLoaderFactory.setCurrentThreadResourceLoader(workspaceResourceLoader);
	}
	}

	/**
	* Updates context of current {@link IWorkspaceResourceLoader resource loader} according to given
	* <code>contextObject</code>.
	*/
	protected void updateResourceLoaderContext(Object contextObject) {
	if (workspaceResourceLoader != null) {
	IFile contextFile = EcorePlatformUtil.getFile(contextObject);
	IModelDescriptor contextModel = ModelDescriptorRegistry.INSTANCE.getModel(contextFile);
	if (contextModel != null) {
	workspaceResourceLoader.setContextModel(contextModel);
	}
	}
	}

	/**
	* Uninstalls current {@link IWorkspaceResourceLoader resource loader}.
	*/
	protected void uninstallResourceLoader() {
	ResourceLoaderFactory.setCurrentThreadResourceLoader(null);
	}

	/**
	* Returns a map with the collections of objects resulting from the Xtend model transformation keyed by the target
	* objects from the {@link XtendEvaluationRequest evaluation requests} that have been provided as input for the
	* Xtend model transformation.
	*/
	public Map<Object, Collection<?>> getResultObjects() {
	return resultObjects;
	}

	@Override
	public boolean belongsTo(Object family) {
	return IExtendedPlatformConstants.FAMILY_LONG_RUNNING.equals(family);
	}
	}