plugins/org.eclipse.sphinx.xtendxpand.ui/src/org/eclipse/sphinx/xtendxpand/ui/groups/ExtensionGroup.java - sphinx/org.eclipse.sphinx - Git at Google

 /**
  * <copyright>
  *
  * Copyright (c) 2011 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
  *
  * </copyright>
  */
 package org.eclipse.sphinx.xtendxpand.ui.groups;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.internal.xtend.xtend.ast.Extension;
 import org.eclipse.internal.xtend.xtend.ast.ExtensionFile;
 import org.eclipse.jface.dialogs.DialogSettings;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.IDialogSettings;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerFilter;
 import org.eclipse.sphinx.emf.mwe.IXtendXpandConstants;
 import org.eclipse.sphinx.emf.util.EcorePlatformUtil;
 import org.eclipse.sphinx.emf.util.EcoreResourceUtil;
 import org.eclipse.sphinx.platform.ui.fields.ComboField;
 import org.eclipse.sphinx.platform.ui.fields.IField;
 import org.eclipse.sphinx.platform.ui.fields.IFieldListener;
 import org.eclipse.sphinx.platform.ui.fields.StringButtonField;
 import org.eclipse.sphinx.platform.ui.fields.StringField;
 import org.eclipse.sphinx.platform.ui.fields.adapters.IButtonAdapter;
 import org.eclipse.sphinx.platform.ui.groups.AbstractGroup;
 import org.eclipse.sphinx.platform.util.ExtendedPlatform;
 import org.eclipse.sphinx.xtendxpand.XtendEvaluationRequest;
 import org.eclipse.sphinx.xtendxpand.ui.internal.Activator;
 import org.eclipse.sphinx.xtendxpand.ui.internal.messages.Messages;
 import org.eclipse.sphinx.xtendxpand.util.XtendXpandUtil;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.ui.dialogs.ElementTreeSelectionDialog;
 import org.eclipse.ui.dialogs.ISelectionStatusValidator;
 import org.eclipse.ui.model.WorkbenchContentProvider;
 import org.eclipse.ui.model.WorkbenchLabelProvider;
 import org.eclipse.ui.views.navigator.ResourceComparator;
 import org.eclipse.xtend.expression.TypeSystem;
 import org.eclipse.xtend.shared.ui.core.IXtendXpandProject;
 import org.eclipse.xtend.shared.ui.core.IXtendXpandResource;
 import org.eclipse.xtend.typesystem.Callable;
 import org.eclipse.xtend.typesystem.Type;

 public class ExtensionGroup extends AbstractGroup {

 	/**
 	 * The extension group dialog settings.
 	 */
 	protected static final String M2M_TRANSFORM_SECTION = Activator.getPlugin().getSymbolicName() + ".M2M_TRANSFORM_SECTION"; //$NON-NLS-1$
 	protected static final String STORE_EXTENSION_FILE = "EXTENSION_FILE$"; //$NON-NLS-1$
 	protected static final String STORE_SELECTED_FUNCTION = "SELECTED_FUNCTION"; //$NON-NLS-1$

 	/**
 	 * The Xtend file field.
 	 */
 	protected StringButtonField extensionFileField;

 	/**
 	 * The function to be used in the relevant Xtend file.
 	 */
 	protected ComboField functionField;

 	/**
 	 * The extension name field.
 	 */
 	protected StringField extensionNameField;

 	/**
 	 * The selected model object.
 	 */
 	protected EObject modelObject;

 	/**
 	 * The {@link TypeSystem type system} to be used.
 	 */
 	protected TypeSystem typeSystem;

 	/**
 	 * Defined extensions in the relevant Xtend file.
 	 */
 	private List<Extension> extensions;

 	public ExtensionGroup(String groupName, EObject modelObject, TypeSystem typeSystem) {
 		this(groupName, modelObject, typeSystem, null);
 	}

 	public ExtensionGroup(String groupName, EObject modelObject, TypeSystem typeSystem, IDialogSettings dialogSettings) {
 		super(groupName, dialogSettings);

 		Assert.isNotNull(typeSystem);

 		this.modelObject = modelObject;
 		this.typeSystem = typeSystem;
 	}

 	@Override
 	protected void doCreateContent(final Composite parent, int numColumns) {
 		parent.setLayout(new GridLayout(numColumns, false));

 		// Extension file field
 		extensionFileField = new StringButtonField(new IButtonAdapter() {

 			@Override
 			public void changeControlPressed(IField field) {
 				ElementTreeSelectionDialog dialog = new ElementTreeSelectionDialog(parent.getShell(), new WorkbenchLabelProvider(),
 						new WorkbenchContentProvider());
 				dialog.setTitle(Messages.label_extensionSelection);
 				dialog.setMessage(Messages.msg_chooseExtension);
 				dialog.setInput(ResourcesPlugin.getWorkspace().getRoot());
 				IFile modelFile = EcorePlatformUtil.getFile(modelObject);
 				if (modelFile != null) {
 					dialog.setInitialSelection(modelFile.getProject());
 				}
 				dialog.setComparator(new ResourceComparator(ResourceComparator.NAME));
 				dialog.addFilter(new ViewerFilter() {

 					@Override
 					public boolean select(Viewer viewer, Object parentElement, Object element) {
 						if (element instanceof IFile) {
 							return IXtendXpandConstants.EXTENSION_EXTENSION.equals(((IFile) element).getFileExtension());
 						}
 						if (element instanceof IResource) {
 							return !ExtendedPlatform.isPlatformPrivateResource((IResource) element);
 						}
 						return true;
 					}
 				});
 				dialog.setValidator(new ISelectionStatusValidator() {

 					@Override
 					public IStatus validate(Object[] selection) {
 						int nSelected = selection.length;
 						String pluginId = Activator.getPlugin().getSymbolicName();
 						if (nSelected == 1 && selection[0] instanceof IFile) {
 							IFile selectedFile = (IFile) selection[0];
 							if (selectedFile.exists() && IXtendXpandConstants.EXTENSION_EXTENSION.equals(selectedFile.getFileExtension())) {
 								return Status.OK_STATUS;
 							}
 						}
 						return new Status(IStatus.ERROR, pluginId, IStatus.ERROR, Messages.msg_chooseExtensionError, null);
 					}
 				});
 				if (dialog.open() == IDialogConstants.OK_ID) {
 					IFile file = (IFile) dialog.getFirstResult();
 					if (file != null) {
 						extensionFileField.setText(file.getFullPath().makeRelative().toString());
 						updateFunctionFieldItems(file);
 					}
 				}
 			}
 		});
 		extensionFileField.setButtonLabel(Messages.label_browse);
 		extensionFileField.setLabelText(Messages.label_extensionFile);
 		extensionFileField.fillIntoGrid(parent, numColumns);
 		extensionFileField.addFieldListener(new IFieldListener() {

 			@Override
 			public void dialogFieldChanged(IField field) {
 				updateFunctionFieldItems(getFile(extensionFileField.getText()));
 				updateExtensionNameField();
 				notifyGroupChanged(extensionFileField);
 			}
 		});

 		// Function name field
 		functionField = new ComboField(true);
 		functionField.setLabelText(Messages.label_functionFieldName);
 		functionField.fillIntoGrid(parent, numColumns);
 		functionField.addFieldListener(new IFieldListener() {

 			@Override
 			public void dialogFieldChanged(IField field) {
 				updateExtensionNameField();
 				notifyGroupChanged(extensionFileField);
 			}
 		});

 		// Extension name field
 		extensionNameField = new StringField();
 		extensionNameField.setLabelText(Messages.label_extensionName);
 		extensionNameField.setEditable(false);
 		extensionNameField.fillIntoGrid(parent, numColumns);
 	}

 	/**
 	 * Updates items of extensions combo field after loading selected Xtend file.
 	 */
 	public void updateFunctionFieldItems(IFile templateFile) {
 		ExtensionFile extensionFile = loadExtensionFile(templateFile);
 		if (extensionFile != null) {
 			extensions = extensionFile.getExtensions();
 			functionField.setItems(createFunctionFieldItems(extensions));
 			return;
 		}
 		functionField.setItems(new String[0]);
 	}

 	/**
 	 * Creates extension items.
 	 */
 	protected String[] createFunctionFieldItems(List<Extension> extensions) {
 		List<String> result = new ArrayList<String>();
 		Type type = typeSystem.getType(modelObject);
 		if (type != null) {
 			for (Callable extension : XtendXpandUtil.getApplicableFeatures(extensions, Extension.class, null, Arrays.asList(type))) {
 				result.add(((Extension) extension).getName());
 			}
 		}
 		// TODO Create an empty combo item if result is empty
 		return result.toArray(new String[result.size()]);
 	}

 	public String getExtensionName() {
 		String selectedFunction = getSelectedFunctionFieldItem();
 		if (selectedFunction != null) {
 			return XtendXpandUtil.getQualifiedName(getFile(getExtensionFileField().getText()), selectedFunction);
 		}
 		return ""; //$NON-NLS-1$
 	}

 	protected void updateExtensionNameField() {
 		IFile templateFile = getFile(extensionFileField.getText());
 		if (templateFile != null) {
 			extensionNameField.setText(getExtensionName());
 		} else {
 			extensionNameField.setText("..."); //$NON-NLS-1$
 		}
 	}

 	/**
 	 * Loads an Xtend resource.
 	 */
 	protected ExtensionFile loadExtensionFile(final IFile extensionFile) {
 		if (extensionFile != null && extensionFile.exists() && IXtendXpandConstants.EXTENSION_EXTENSION.equals(extensionFile.getFileExtension())) {
 			final IXtendXpandProject project = org.eclipse.xtend.shared.ui.Activator.getExtXptModelManager().findProject(extensionFile);
 			if (project != null) {
 				final IXtendXpandResource resource = project.findXtendXpandResource(extensionFile);
 				if (resource != null) {
 					return (ExtensionFile) resource.getExtXptResource();
 				}
 			}
 		}
 		return null;
 	}

 	@Override
 	public boolean isGroupComplete() {
 		IFile extensionFile = getFile(getExtensionFileField().getText());
 		if (extensionFile != null) {
 			return extensionFile.exists() && getFunctionField().getSelectionIndex() != -1;
 		}
 		return false;
 	}

 	/**
 	 * Gets the file located at the given full path or returns null.
 	 */
 	protected IFile getFile(String fullPath) {
 		if (fullPath != null && fullPath.length() > 0) {
 			Path path = new Path(fullPath);
 			if (path.segmentCount() > 1) {
 				return ResourcesPlugin.getWorkspace().getRoot().getFile(path);
 			}
 		}
 		return null;
 	}

 	public String getSelectedFunctionFieldItem() {
 		if (functionField != null && !functionField.getComboControl().isDisposed()) {
 			String[] items = functionField.getItems();
 			int selectionIndex = functionField.getSelectionIndex();
 			if (items.length > 0 && selectionIndex != -1) {
 				return items[selectionIndex];
 			}
 		}
 		return null;
 	}

 	public StringButtonField getExtensionFileField() {
 		return extensionFileField;
 	}

 	public ComboField getFunctionField() {
 		return functionField;
 	}

 	public List<Extension> getExtensions() {
 		return extensions;
 	}

 	public Collection<XtendEvaluationRequest> getXtendEvaluationRequests() {
 		List<XtendEvaluationRequest> requests = new ArrayList<XtendEvaluationRequest>();
 		if (modelObject != null) {
 			String extensionName = getExtensionName();
 			if (extensionName != null && extensionName.length() > 0) {
 				requests.add(new XtendEvaluationRequest(extensionName, modelObject));
 			}
 		}
 		return requests;
 	}

 	/**
 	 * Loads the template path and the define block from the dialog settings. Must call
 	 * {@link #setDialogSettings(IDialogSettings)} before calling this method.
 	 */
 	@Override
 	protected void loadGroupSettings() {
 		String extensionFile = getExtensionFileFromDialogSettings();
 		if (extensionFile != null) {
 			extensionFileField.setText(extensionFile);
 			updateFunctionFieldItems(getFile(extensionFile));
 			String functionName = getFunctionFromDialogSettings();
 			if (functionName != null) {
 				functionField.selectItem(functionName);
 			}
 		}
 	}

 	public String getExtensionFileFromDialogSettings() {
 		String result = null;
 		String key = getExtensionFileDialogSettingsKey(modelObject);
 		IDialogSettings extensionFileSection = getExtensionFileSection();
 		if (extensionFileSection != null) {
 			String extensionFilePath = extensionFileSection.get(key);
 			if (extensionFilePath != null) {
 				IFile extensionFile = getFile(extensionFilePath);
 				if (extensionFile != null && extensionFile.exists()) {
 					result = extensionFilePath;
 				}
 			}
 		}
 		return result;
 	}

 	public String getFunctionFromDialogSettings() {
 		String result = null;
 		IDialogSettings extensionFileSection = getExtensionFileSection();
 		if (extensionFileSection != null) {
 			result = extensionFileSection.get(STORE_SELECTED_FUNCTION);
 		}
 		return result;
 	}

 	protected IDialogSettings getExtensionFileSection() {
 		IDialogSettings result = null;
 		String key = getExtensionFileDialogSettingsKey(modelObject);
 		IDialogSettings section = getDialogSettings().getSection(M2M_TRANSFORM_SECTION);
 		if (section != null) {
 			result = section.getSection(key);
 		}
 		return result;
 	}

 	/**
 	 * Saves, using the {@link DialogSettings} dialogSettings, the state of the different fields of this group.
 	 *
 	 * @param templatePathDialogSettingsKey
 	 * @see #setDialogSettings(IDialogSettings)
 	 */
 	@Override
 	public void saveGroupSettings() {
 		IDialogSettings settings = getDialogSettings();
 		String extensionFileDialogSettingsKey = getExtensionFileDialogSettingsKey(modelObject);
 		if (settings != null) {
 			IDialogSettings topLevelSection = settings.getSection(M2M_TRANSFORM_SECTION);
 			if (topLevelSection == null) {
 				topLevelSection = settings.addNewSection(M2M_TRANSFORM_SECTION);
 			}
 			if (extensionFileField.getText().trim().length() != 0) {
 				IDialogSettings extensionFileSection = topLevelSection.getSection(extensionFileDialogSettingsKey);
 				if (extensionFileSection == null) {
 					extensionFileSection = topLevelSection.addNewSection(extensionFileDialogSettingsKey);
 				}
 				extensionFileSection.put(extensionFileDialogSettingsKey, extensionFileField.getText());
 				String[] items = functionField.getItems();
 				int selectionIndex = functionField.getSelectionIndex();
 				if (items.length > 0 && selectionIndex != -1) {
 					extensionFileSection.put(STORE_SELECTED_FUNCTION, items[selectionIndex]);
 				}
 			}
 		}
 	}

 	protected String getExtensionFileDialogSettingsKey(EObject object) {
 		Assert.isNotNull(object);
 		return ExtensionGroup.STORE_EXTENSION_FILE + EcoreResourceUtil.getURI(object).toString();
 	}
 }
	/**
	* <copyright>
	*
	* Copyright (c) 2011 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
	*
	* </copyright>
	*/
	package org.eclipse.sphinx.xtendxpand.ui.groups;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.List;

	import org.eclipse.core.resources.IFile;
	import org.eclipse.core.resources.IResource;
	import org.eclipse.core.resources.ResourcesPlugin;
	import org.eclipse.core.runtime.Assert;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.internal.xtend.xtend.ast.Extension;
	import org.eclipse.internal.xtend.xtend.ast.ExtensionFile;
	import org.eclipse.jface.dialogs.DialogSettings;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.IDialogSettings;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerFilter;
	import org.eclipse.sphinx.emf.mwe.IXtendXpandConstants;
	import org.eclipse.sphinx.emf.util.EcorePlatformUtil;
	import org.eclipse.sphinx.emf.util.EcoreResourceUtil;
	import org.eclipse.sphinx.platform.ui.fields.ComboField;
	import org.eclipse.sphinx.platform.ui.fields.IField;
	import org.eclipse.sphinx.platform.ui.fields.IFieldListener;
	import org.eclipse.sphinx.platform.ui.fields.StringButtonField;
	import org.eclipse.sphinx.platform.ui.fields.StringField;
	import org.eclipse.sphinx.platform.ui.fields.adapters.IButtonAdapter;
	import org.eclipse.sphinx.platform.ui.groups.AbstractGroup;
	import org.eclipse.sphinx.platform.util.ExtendedPlatform;
	import org.eclipse.sphinx.xtendxpand.XtendEvaluationRequest;
	import org.eclipse.sphinx.xtendxpand.ui.internal.Activator;
	import org.eclipse.sphinx.xtendxpand.ui.internal.messages.Messages;
	import org.eclipse.sphinx.xtendxpand.util.XtendXpandUtil;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.ui.dialogs.ElementTreeSelectionDialog;
	import org.eclipse.ui.dialogs.ISelectionStatusValidator;
	import org.eclipse.ui.model.WorkbenchContentProvider;
	import org.eclipse.ui.model.WorkbenchLabelProvider;
	import org.eclipse.ui.views.navigator.ResourceComparator;
	import org.eclipse.xtend.expression.TypeSystem;
	import org.eclipse.xtend.shared.ui.core.IXtendXpandProject;
	import org.eclipse.xtend.shared.ui.core.IXtendXpandResource;
	import org.eclipse.xtend.typesystem.Callable;
	import org.eclipse.xtend.typesystem.Type;

	public class ExtensionGroup extends AbstractGroup {

	/**
	* The extension group dialog settings.
	*/
	protected static final String M2M_TRANSFORM_SECTION = Activator.getPlugin().getSymbolicName() + ".M2M_TRANSFORM_SECTION"; //$NON-NLS-1$
	protected static final String STORE_EXTENSION_FILE = "EXTENSION_FILE$"; //$NON-NLS-1$
	protected static final String STORE_SELECTED_FUNCTION = "SELECTED_FUNCTION"; //$NON-NLS-1$

	/**
	* The Xtend file field.
	*/
	protected StringButtonField extensionFileField;

	/**
	* The function to be used in the relevant Xtend file.
	*/
	protected ComboField functionField;

	/**
	* The extension name field.
	*/
	protected StringField extensionNameField;

	/**
	* The selected model object.
	*/
	protected EObject modelObject;

	/**
	* The {@link TypeSystem type system} to be used.
	*/
	protected TypeSystem typeSystem;

	/**
	* Defined extensions in the relevant Xtend file.
	*/
	private List<Extension> extensions;

	public ExtensionGroup(String groupName, EObject modelObject, TypeSystem typeSystem) {
	this(groupName, modelObject, typeSystem, null);
	}

	public ExtensionGroup(String groupName, EObject modelObject, TypeSystem typeSystem, IDialogSettings dialogSettings) {
	super(groupName, dialogSettings);

	Assert.isNotNull(typeSystem);

	this.modelObject = modelObject;
	this.typeSystem = typeSystem;
	}

	@Override
	protected void doCreateContent(final Composite parent, int numColumns) {
	parent.setLayout(new GridLayout(numColumns, false));

	// Extension file field
	extensionFileField = new StringButtonField(new IButtonAdapter() {

	@Override
	public void changeControlPressed(IField field) {
	ElementTreeSelectionDialog dialog = new ElementTreeSelectionDialog(parent.getShell(), new WorkbenchLabelProvider(),
	new WorkbenchContentProvider());
	dialog.setTitle(Messages.label_extensionSelection);
	dialog.setMessage(Messages.msg_chooseExtension);
	dialog.setInput(ResourcesPlugin.getWorkspace().getRoot());
	IFile modelFile = EcorePlatformUtil.getFile(modelObject);
	if (modelFile != null) {
	dialog.setInitialSelection(modelFile.getProject());
	}
	dialog.setComparator(new ResourceComparator(ResourceComparator.NAME));
	dialog.addFilter(new ViewerFilter() {

	@Override
	public boolean select(Viewer viewer, Object parentElement, Object element) {
	if (element instanceof IFile) {
	return IXtendXpandConstants.EXTENSION_EXTENSION.equals(((IFile) element).getFileExtension());
	}
	if (element instanceof IResource) {
	return !ExtendedPlatform.isPlatformPrivateResource((IResource) element);
	}
	return true;
	}
	});
	dialog.setValidator(new ISelectionStatusValidator() {

	@Override
	public IStatus validate(Object[] selection) {
	int nSelected = selection.length;
	String pluginId = Activator.getPlugin().getSymbolicName();
	if (nSelected == 1 && selection[0] instanceof IFile) {
	IFile selectedFile = (IFile) selection[0];
	if (selectedFile.exists() && IXtendXpandConstants.EXTENSION_EXTENSION.equals(selectedFile.getFileExtension())) {
	return Status.OK_STATUS;
	}
	}
	return new Status(IStatus.ERROR, pluginId, IStatus.ERROR, Messages.msg_chooseExtensionError, null);
	}
	});
	if (dialog.open() == IDialogConstants.OK_ID) {
	IFile file = (IFile) dialog.getFirstResult();
	if (file != null) {
	extensionFileField.setText(file.getFullPath().makeRelative().toString());
	updateFunctionFieldItems(file);
	}
	}
	}
	});
	extensionFileField.setButtonLabel(Messages.label_browse);
	extensionFileField.setLabelText(Messages.label_extensionFile);
	extensionFileField.fillIntoGrid(parent, numColumns);
	extensionFileField.addFieldListener(new IFieldListener() {

	@Override
	public void dialogFieldChanged(IField field) {
	updateFunctionFieldItems(getFile(extensionFileField.getText()));
	updateExtensionNameField();
	notifyGroupChanged(extensionFileField);
	}
	});

	// Function name field
	functionField = new ComboField(true);
	functionField.setLabelText(Messages.label_functionFieldName);
	functionField.fillIntoGrid(parent, numColumns);
	functionField.addFieldListener(new IFieldListener() {

	@Override
	public void dialogFieldChanged(IField field) {
	updateExtensionNameField();
	notifyGroupChanged(extensionFileField);
	}
	});

	// Extension name field
	extensionNameField = new StringField();
	extensionNameField.setLabelText(Messages.label_extensionName);
	extensionNameField.setEditable(false);
	extensionNameField.fillIntoGrid(parent, numColumns);
	}

	/**
	* Updates items of extensions combo field after loading selected Xtend file.
	*/
	public void updateFunctionFieldItems(IFile templateFile) {
	ExtensionFile extensionFile = loadExtensionFile(templateFile);
	if (extensionFile != null) {
	extensions = extensionFile.getExtensions();
	functionField.setItems(createFunctionFieldItems(extensions));
	return;
	}
	functionField.setItems(new String[0]);
	}

	/**
	* Creates extension items.
	*/
	protected String[] createFunctionFieldItems(List<Extension> extensions) {
	List<String> result = new ArrayList<String>();
	Type type = typeSystem.getType(modelObject);
	if (type != null) {
	for (Callable extension : XtendXpandUtil.getApplicableFeatures(extensions, Extension.class, null, Arrays.asList(type))) {
	result.add(((Extension) extension).getName());
	}
	}
	// TODO Create an empty combo item if result is empty
	return result.toArray(new String[result.size()]);
	}

	public String getExtensionName() {
	String selectedFunction = getSelectedFunctionFieldItem();
	if (selectedFunction != null) {
	return XtendXpandUtil.getQualifiedName(getFile(getExtensionFileField().getText()), selectedFunction);
	}
	return ""; //$NON-NLS-1$
	}

	protected void updateExtensionNameField() {
	IFile templateFile = getFile(extensionFileField.getText());
	if (templateFile != null) {
	extensionNameField.setText(getExtensionName());
	} else {
	extensionNameField.setText("..."); //$NON-NLS-1$
	}
	}

	/**
	* Loads an Xtend resource.
	*/
	protected ExtensionFile loadExtensionFile(final IFile extensionFile) {
	if (extensionFile != null && extensionFile.exists() && IXtendXpandConstants.EXTENSION_EXTENSION.equals(extensionFile.getFileExtension())) {
	final IXtendXpandProject project = org.eclipse.xtend.shared.ui.Activator.getExtXptModelManager().findProject(extensionFile);
	if (project != null) {
	final IXtendXpandResource resource = project.findXtendXpandResource(extensionFile);
	if (resource != null) {
	return (ExtensionFile) resource.getExtXptResource();
	}
	}
	}
	return null;
	}

	@Override
	public boolean isGroupComplete() {
	IFile extensionFile = getFile(getExtensionFileField().getText());
	if (extensionFile != null) {
	return extensionFile.exists() && getFunctionField().getSelectionIndex() != -1;
	}
	return false;
	}

	/**
	* Gets the file located at the given full path or returns null.
	*/
	protected IFile getFile(String fullPath) {
	if (fullPath != null && fullPath.length() > 0) {
	Path path = new Path(fullPath);
	if (path.segmentCount() > 1) {
	return ResourcesPlugin.getWorkspace().getRoot().getFile(path);
	}
	}
	return null;
	}

	public String getSelectedFunctionFieldItem() {
	if (functionField != null && !functionField.getComboControl().isDisposed()) {
	String[] items = functionField.getItems();
	int selectionIndex = functionField.getSelectionIndex();
	if (items.length > 0 && selectionIndex != -1) {
	return items[selectionIndex];
	}
	}
	return null;
	}

	public StringButtonField getExtensionFileField() {
	return extensionFileField;
	}

	public ComboField getFunctionField() {
	return functionField;
	}

	public List<Extension> getExtensions() {
	return extensions;
	}

	public Collection<XtendEvaluationRequest> getXtendEvaluationRequests() {
	List<XtendEvaluationRequest> requests = new ArrayList<XtendEvaluationRequest>();
	if (modelObject != null) {
	String extensionName = getExtensionName();
	if (extensionName != null && extensionName.length() > 0) {
	requests.add(new XtendEvaluationRequest(extensionName, modelObject));
	}
	}
	return requests;
	}

	/**
	* Loads the template path and the define block from the dialog settings. Must call
	* {@link #setDialogSettings(IDialogSettings)} before calling this method.
	*/
	@Override
	protected void loadGroupSettings() {
	String extensionFile = getExtensionFileFromDialogSettings();
	if (extensionFile != null) {
	extensionFileField.setText(extensionFile);
	updateFunctionFieldItems(getFile(extensionFile));
	String functionName = getFunctionFromDialogSettings();
	if (functionName != null) {
	functionField.selectItem(functionName);
	}
	}
	}

	public String getExtensionFileFromDialogSettings() {
	String result = null;
	String key = getExtensionFileDialogSettingsKey(modelObject);
	IDialogSettings extensionFileSection = getExtensionFileSection();
	if (extensionFileSection != null) {
	String extensionFilePath = extensionFileSection.get(key);
	if (extensionFilePath != null) {
	IFile extensionFile = getFile(extensionFilePath);
	if (extensionFile != null && extensionFile.exists()) {
	result = extensionFilePath;
	}
	}
	}
	return result;
	}

	public String getFunctionFromDialogSettings() {
	String result = null;
	IDialogSettings extensionFileSection = getExtensionFileSection();
	if (extensionFileSection != null) {
	result = extensionFileSection.get(STORE_SELECTED_FUNCTION);
	}
	return result;
	}

	protected IDialogSettings getExtensionFileSection() {
	IDialogSettings result = null;
	String key = getExtensionFileDialogSettingsKey(modelObject);
	IDialogSettings section = getDialogSettings().getSection(M2M_TRANSFORM_SECTION);
	if (section != null) {
	result = section.getSection(key);
	}
	return result;
	}

	/**
	* Saves, using the {@link DialogSettings} dialogSettings, the state of the different fields of this group.
	*
	* @param templatePathDialogSettingsKey
	* @see #setDialogSettings(IDialogSettings)
	*/
	@Override
	public void saveGroupSettings() {
	IDialogSettings settings = getDialogSettings();
	String extensionFileDialogSettingsKey = getExtensionFileDialogSettingsKey(modelObject);
	if (settings != null) {
	IDialogSettings topLevelSection = settings.getSection(M2M_TRANSFORM_SECTION);
	if (topLevelSection == null) {
	topLevelSection = settings.addNewSection(M2M_TRANSFORM_SECTION);
	}
	if (extensionFileField.getText().trim().length() != 0) {
	IDialogSettings extensionFileSection = topLevelSection.getSection(extensionFileDialogSettingsKey);
	if (extensionFileSection == null) {
	extensionFileSection = topLevelSection.addNewSection(extensionFileDialogSettingsKey);
	}
	extensionFileSection.put(extensionFileDialogSettingsKey, extensionFileField.getText());
	String[] items = functionField.getItems();
	int selectionIndex = functionField.getSelectionIndex();
	if (items.length > 0 && selectionIndex != -1) {
	extensionFileSection.put(STORE_SELECTED_FUNCTION, items[selectionIndex]);
	}
	}
	}
	}

	protected String getExtensionFileDialogSettingsKey(EObject object) {
	Assert.isNotNull(object);
	return ExtensionGroup.STORE_EXTENSION_FILE + EcoreResourceUtil.getURI(object).toString();
	}
	}