bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CreateLinkedResourceGroup.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2003 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.ide.dialogs;

 import java.io.File;

 import org.eclipse.core.resources.*;
 import org.eclipse.core.runtime.*;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
 import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;

 /**
  * Widget group for specifying a linked file or folder target.
  *
  * @since 2.1
  */
 public class CreateLinkedResourceGroup {
 	private Listener listener;
 	private String linkTarget = "";	//$NON-NLS-1$
 	private int type;
 	private boolean createLink = false;

 	// used to compute layout sizes
 	private FontMetrics fontMetrics;

 	// widgets
 	private Composite groupComposite;
 	private Text linkTargetField;
 	private Button browseButton;
 	private Button variablesButton;
 	private Label resolvedPathLabelText;
 	private Label resolvedPathLabelData;

 /**
  * Creates a link target group
  *
  * @param type specifies the type of resource to link to.
  * 	<code>IResource.FILE</code> or <code>IResource.FOLDER</code>
  * @param listener listener to notify when one of the widgets'
  * 	value is changed.
  */
 public CreateLinkedResourceGroup(int type, Listener listener) {
 	this.type = type;
 	this.listener = listener;
 }
 /**
  * Creates the widgets
  *
  * @param parent parent composite of the widget group
  * @return the widget group
  */
 public Composite createContents(Composite parent) {
 	Font font = parent.getFont();
 	initializeDialogUnits(parent);
 	// top level group
 	groupComposite = new Composite(parent,SWT.NONE);
 	GridLayout layout = new GridLayout();
 	groupComposite.setLayout(layout);
 	groupComposite.setLayoutData(new GridData(
 		GridData.VERTICAL_ALIGN_FILL | GridData.FILL_HORIZONTAL));
 	groupComposite.setFont(font);

 	final Button createLinkButton = new Button(groupComposite, SWT.CHECK);
 	if (type == IResource.FILE)
 		createLinkButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkFileButton")); //$NON-NLS-1$
 	else
 		createLinkButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkFolderButton")); //$NON-NLS-1$
 	createLinkButton.setSelection(createLink);
 	createLinkButton.setFont(font);
 	SelectionListener selectionListener = new SelectionAdapter() {
 		public void widgetSelected(SelectionEvent e) {
 			createLink = createLinkButton.getSelection();
 			browseButton.setEnabled(createLink);
 			variablesButton.setEnabled(createLink);
 			linkTargetField.setEnabled(createLink);
 			if (listener != null)
 				listener.handleEvent(new Event());
 		}
 	};
 	createLinkButton.addSelectionListener(selectionListener);

 	createLinkLocationGroup(groupComposite, createLink);
 	return groupComposite;
 }
 /**
  * Creates the link target location widgets.
  *
  * @param locationGroup the parent composite
  * @param enabled sets the initial enabled state of the widgets
  */
 private void createLinkLocationGroup(Composite locationGroup, boolean enabled) {
 	Font font = locationGroup.getFont();
 	Button button = new Button(locationGroup, SWT.CHECK);
 	int indent = button.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;

 	button.dispose();

 	// linkTargetGroup is necessary to decouple layout from
 	// resolvedPathGroup layout
 	Composite linkTargetGroup = new Composite(locationGroup, SWT.NONE);
 	GridLayout layout = new GridLayout();
 	layout.numColumns = 3;
 	layout.marginHeight = 0;
 	layout.marginWidth = 0;
 	linkTargetGroup.setLayout(layout);
 	GridData data = new GridData(GridData.FILL_HORIZONTAL);
 	data.horizontalIndent = indent;
 	linkTargetGroup.setLayoutData(data);
 	linkTargetGroup.setFont(font);

 	// link target location entry field
 	linkTargetField = new Text(linkTargetGroup, SWT.BORDER);
 	data = new GridData(GridData.FILL_HORIZONTAL);
 	data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
 	linkTargetField.setLayoutData(data);
 	linkTargetField.setFont(font);
 	linkTargetField.setEnabled(enabled);
 	linkTargetField.addModifyListener(new ModifyListener() {
 		public void modifyText(ModifyEvent e) {
 			linkTarget = linkTargetField.getText();
 			resolveVariable();
 			if (listener != null)
 				listener.handleEvent(new Event());
 		}
 	});
 	// browse button
 	browseButton = new Button(linkTargetGroup, SWT.PUSH);
 	setButtonLayoutData(browseButton);
 	browseButton.setFont(font);
 	browseButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.browseButton")); //$NON-NLS-1$
 	browseButton.addSelectionListener(new SelectionAdapter() {
 		public void widgetSelected(SelectionEvent event) {
 			handleLinkTargetBrowseButtonPressed();
 		}
 	});
 	browseButton.setEnabled(enabled);

 	// variables button
 	variablesButton = new Button(linkTargetGroup, SWT.PUSH);
 	setButtonLayoutData(variablesButton);
 	variablesButton.setFont(font);
 	variablesButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.variablesButton")); //$NON-NLS-1$
 	variablesButton.addSelectionListener(new SelectionAdapter() {
 		public void widgetSelected(SelectionEvent event) {
 			handleVariablesButtonPressed();
 		}
 	});
 	variablesButton.setEnabled(enabled);

 	Composite resolvedPathGroup = new Composite(locationGroup, SWT.NONE);
 	layout = new GridLayout();
 	layout.numColumns = 2;
 	layout.marginHeight = 0;
 	layout.marginWidth = 0;
 	resolvedPathGroup.setLayout(layout);
 	data = new GridData(GridData.FILL_HORIZONTAL);
 	data.horizontalIndent = indent;
 	resolvedPathGroup.setLayoutData(data);
 	resolvedPathGroup.setFont(font);

 	resolvedPathLabelText = new Label(resolvedPathGroup, SWT.SINGLE);
 	resolvedPathLabelText.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.resolvedPathLabel")); //$NON-NLS-1$
 	resolvedPathLabelText.setVisible(false);

 	resolvedPathLabelData = new Label(resolvedPathGroup, SWT.SINGLE);
 	data = new GridData(GridData.FILL_HORIZONTAL);
 	resolvedPathLabelData.setLayoutData(data);
 	resolvedPathLabelData.setVisible(false);

 	if (linkTarget != null)
 		linkTargetField.setText(linkTarget);
 }
 /**
  * Returns a new status object with the given severity and message.
  *
  * @return a new status object with the given severity and message.
  */
 private IStatus createStatus(int severity, String message) {
 	return new Status(
 		severity,
 		IDEWorkbenchPlugin.getDefault().getDescriptor().getUniqueIdentifier(),
 		severity,
 		message,
 		null);
 }
 /**
  * Disposes the group's widgets.
  */
 public void dispose() {
 	if (groupComposite != null && groupComposite.isDisposed() == false)
 	 	groupComposite.dispose();
 }
 /**
  * Returns the link target location entered by the user.
  *
  * @return the link target location entered by the user. null if the user
  * 	chose not to create a link.
  */
 public String getLinkTarget() {
 	if (createLink)
 		return linkTarget;

 	return null;
 }
 /**
  * Opens a file or directory browser depending on the link type.
  */
 private void handleLinkTargetBrowseButtonPressed() {
 	File file = null;
 	String selection = null;

 	if ("".equals(linkTarget) == false) {	//$NON-NLS-1$
 		file = new File(linkTarget);
 		if (file.exists() == false)
 			file = null;
 	}
 	if (type == IResource.FILE) {
 		FileDialog dialog = new FileDialog(linkTargetField.getShell());
 		if (file != null) {
 			if (file.isFile())
 				dialog.setFileName(linkTarget);
 			else
 				dialog.setFilterPath(linkTarget);
 		}
 		selection = dialog.open();
 	}
 	else {
 		DirectoryDialog dialog = new DirectoryDialog(linkTargetField.getShell());
 		if (file != null) {
 			String path = linkTarget;
 			if (file.isFile())
 				path = file.getParent();
 			if (path != null)
 				dialog.setFilterPath(path);
 		}
 		dialog.setMessage(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.targetSelectionLabel")); //$NON-NLS-1$
 		selection = dialog.open();
 	}
 	if (selection != null)
 		linkTargetField.setText(selection);
 }
 /**
  * Opens a path variable selection dialog
  */
 private void handleVariablesButtonPressed() {
 	int variableTypes = IResource.FOLDER;

 	// allow selecting file and folder variables when creating a
 	// linked file
 	if (type == IResource.FILE)
 		variableTypes |= IResource.FILE;

 	PathVariableSelectionDialog dialog =
 		new PathVariableSelectionDialog(linkTargetField.getShell(), variableTypes);
 	if (dialog.open() == IDialogConstants.OK_ID) {
 		String[] variableNames = (String[]) dialog.getResult();
 		if (variableNames != null && variableNames.length == 1)
 			linkTargetField.setText(variableNames[0]);
 	}
 }
 /**
  * Initializes the computation of horizontal and vertical dialog units
  * based on the size of current font.
  * <p>
  * This method must be called before <code>setButtonLayoutData</code>
  * is called.
  * </p>
  *
  * @param control a control from which to obtain the current font
  */
 protected void initializeDialogUnits(Control control) {
 	// Compute and store a font metric
 	GC gc = new GC(control);
 	gc.setFont(control.getFont());
 	fontMetrics = gc.getFontMetrics();
 	gc.dispose();
 }
 /**
  * Tries to resolve the value entered in the link target field as
  * a variable, if the value is a relative path.
  * Displays the resolved value if the entered value is a variable.
  */
 private void resolveVariable() {
 	IPathVariableManager pathVariableManager = ResourcesPlugin.getWorkspace().getPathVariableManager();
 	IPath path = new Path(linkTarget);
 	IPath resolvedPath = pathVariableManager.resolvePath(path);

 	if (path.equals(resolvedPath)) {
 		resolvedPathLabelText.setVisible(false);
 		resolvedPathLabelData.setVisible(false);
 	} else {
 		resolvedPathLabelText.setVisible(true);
 		resolvedPathLabelData.setVisible(true);
 	}
 	resolvedPathLabelData.setText(resolvedPath.toOSString());
 }
 /**
  * Sets the <code>GridData</code> on the specified button to
  * be one that is spaced for the current dialog page units. The
  * method <code>initializeDialogUnits</code> must be called once
  * before calling this method for the first time.
  *
  * @param button the button to set the <code>GridData</code>
  * @return the <code>GridData</code> set on the specified button
  */
 private GridData setButtonLayoutData(Button button) {
 	GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 	data.heightHint = Dialog.convertVerticalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_HEIGHT);
 	int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_WIDTH);
 	data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
 	button.setLayoutData(data);
 	return data;
 }
 /**
  * Sets the value of the link target field
  *
  * @param target the value of the link target field
  */
 public void setLinkTarget(String target) {
 	linkTarget = target;
 	if (linkTargetField != null && linkTargetField.isDisposed() == false)
 		linkTargetField.setText(target);
 }
 /**
  * Validates the type of the given file against the link type specified
  * in the constructor.
  *
  * @param linkTargetFile file to validate
  * @return IStatus indicating the validation result. IStatus.OK if the
  * 	given file is valid.
  */
 private IStatus validateFileType(File linkTargetFile) {
 	if (type == IResource.FILE && linkTargetFile.isFile() == false) {
 		return createStatus(
 			IStatus.ERROR,
 			IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNotFile"));	//$NON-NLS-1$
 	} else if (type == IResource.FOLDER && linkTargetFile.isDirectory() == false) {
 		return createStatus(
 			IStatus.ERROR,
 			IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNotFolder"));	//$NON-NLS-1$
 	}
 	return createStatus(IStatus.OK, ""); //$NON-NLS-1$
 }
 /**
  * Validates this page's controls.
  *
  * @return IStatus indicating the validation result. IStatus.OK if the
  * 	specified link target is valid given the linkHandle.
  */
 public IStatus validateLinkLocation(IResource linkHandle) {
 	if (linkTargetField == null || linkTargetField.isDisposed())
 		return createStatus(IStatus.OK, "");	//$NON-NLS-1$

 	IWorkspace workspace = IDEWorkbenchPlugin.getPluginWorkspace();
 	IPath path = new Path(linkTarget);

 	if (createLink == false)
 		return createStatus(IStatus.OK, ""); //$NON-NLS-1$

 	IStatus locationStatus = workspace.validateLinkLocation(linkHandle,	path);
 	if (locationStatus.getSeverity() == IStatus.ERROR)
 		return locationStatus;

 	// use the resolved link target name
 	String resolvedLinkTarget = resolvedPathLabelData.getText();
 	path = new Path(resolvedLinkTarget);
 	File linkTargetFile = new Path(resolvedLinkTarget).toFile();
 	if (linkTargetFile.exists()) {
 		IStatus fileTypeStatus = validateFileType(linkTargetFile);
 		if (fileTypeStatus.isOK() == false)
 			return fileTypeStatus;
 	} else if (locationStatus.getSeverity() == IStatus.OK) {
 		// locationStatus takes precedence over missing location warning.
 		return createStatus(
 			IStatus.WARNING,
 			IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNonExistent"));	//$NON-NLS-1$
 	}
 	return locationStatus;
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2003 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Common Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/cpl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/

	package org.eclipse.ui.internal.ide.dialogs;

	import java.io.File;

	import org.eclipse.core.resources.*;
	import org.eclipse.core.runtime.*;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.*;
	import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
	import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;

	/**
	* Widget group for specifying a linked file or folder target.
	*
	* @since 2.1
	*/
	public class CreateLinkedResourceGroup {
	private Listener listener;
	private String linkTarget = ""; //$NON-NLS-1$
	private int type;
	private boolean createLink = false;

	// used to compute layout sizes
	private FontMetrics fontMetrics;

	// widgets
	private Composite groupComposite;
	private Text linkTargetField;
	private Button browseButton;
	private Button variablesButton;
	private Label resolvedPathLabelText;
	private Label resolvedPathLabelData;

	/**
	* Creates a link target group
	*
	* @param type specifies the type of resource to link to.
	* <code>IResource.FILE</code> or <code>IResource.FOLDER</code>
	* @param listener listener to notify when one of the widgets'
	* value is changed.
	*/
	public CreateLinkedResourceGroup(int type, Listener listener) {
	this.type = type;
	this.listener = listener;
	}
	/**
	* Creates the widgets
	*
	* @param parent parent composite of the widget group
	* @return the widget group
	*/
	public Composite createContents(Composite parent) {
	Font font = parent.getFont();
	initializeDialogUnits(parent);
	// top level group
	groupComposite = new Composite(parent,SWT.NONE);
	GridLayout layout = new GridLayout();
	groupComposite.setLayout(layout);
	groupComposite.setLayoutData(new GridData(
	GridData.VERTICAL_ALIGN_FILL \| GridData.FILL_HORIZONTAL));
	groupComposite.setFont(font);

	final Button createLinkButton = new Button(groupComposite, SWT.CHECK);
	if (type == IResource.FILE)
	createLinkButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkFileButton")); //$NON-NLS-1$
	else
	createLinkButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkFolderButton")); //$NON-NLS-1$
	createLinkButton.setSelection(createLink);
	createLinkButton.setFont(font);
	SelectionListener selectionListener = new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	createLink = createLinkButton.getSelection();
	browseButton.setEnabled(createLink);
	variablesButton.setEnabled(createLink);
	linkTargetField.setEnabled(createLink);
	if (listener != null)
	listener.handleEvent(new Event());
	}
	};
	createLinkButton.addSelectionListener(selectionListener);

	createLinkLocationGroup(groupComposite, createLink);
	return groupComposite;
	}
	/**
	* Creates the link target location widgets.
	*
	* @param locationGroup the parent composite
	* @param enabled sets the initial enabled state of the widgets
	*/
	private void createLinkLocationGroup(Composite locationGroup, boolean enabled) {
	Font font = locationGroup.getFont();
	Button button = new Button(locationGroup, SWT.CHECK);
	int indent = button.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;

	button.dispose();

	// linkTargetGroup is necessary to decouple layout from
	// resolvedPathGroup layout
	Composite linkTargetGroup = new Composite(locationGroup, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 3;
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	linkTargetGroup.setLayout(layout);
	GridData data = new GridData(GridData.FILL_HORIZONTAL);
	data.horizontalIndent = indent;
	linkTargetGroup.setLayoutData(data);
	linkTargetGroup.setFont(font);

	// link target location entry field
	linkTargetField = new Text(linkTargetGroup, SWT.BORDER);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
	linkTargetField.setLayoutData(data);
	linkTargetField.setFont(font);
	linkTargetField.setEnabled(enabled);
	linkTargetField.addModifyListener(new ModifyListener() {
	public void modifyText(ModifyEvent e) {
	linkTarget = linkTargetField.getText();
	resolveVariable();
	if (listener != null)
	listener.handleEvent(new Event());
	}
	});
	// browse button
	browseButton = new Button(linkTargetGroup, SWT.PUSH);
	setButtonLayoutData(browseButton);
	browseButton.setFont(font);
	browseButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.browseButton")); //$NON-NLS-1$
	browseButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	handleLinkTargetBrowseButtonPressed();
	}
	});
	browseButton.setEnabled(enabled);

	// variables button
	variablesButton = new Button(linkTargetGroup, SWT.PUSH);
	setButtonLayoutData(variablesButton);
	variablesButton.setFont(font);
	variablesButton.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.variablesButton")); //$NON-NLS-1$
	variablesButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	handleVariablesButtonPressed();
	}
	});
	variablesButton.setEnabled(enabled);

	Composite resolvedPathGroup = new Composite(locationGroup, SWT.NONE);
	layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	resolvedPathGroup.setLayout(layout);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.horizontalIndent = indent;
	resolvedPathGroup.setLayoutData(data);
	resolvedPathGroup.setFont(font);

	resolvedPathLabelText = new Label(resolvedPathGroup, SWT.SINGLE);
	resolvedPathLabelText.setText(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.resolvedPathLabel")); //$NON-NLS-1$
	resolvedPathLabelText.setVisible(false);

	resolvedPathLabelData = new Label(resolvedPathGroup, SWT.SINGLE);
	data = new GridData(GridData.FILL_HORIZONTAL);
	resolvedPathLabelData.setLayoutData(data);
	resolvedPathLabelData.setVisible(false);

	if (linkTarget != null)
	linkTargetField.setText(linkTarget);
	}
	/**
	* Returns a new status object with the given severity and message.
	*
	* @return a new status object with the given severity and message.
	*/
	private IStatus createStatus(int severity, String message) {
	return new Status(
	severity,
	IDEWorkbenchPlugin.getDefault().getDescriptor().getUniqueIdentifier(),
	severity,
	message,
	null);
	}
	/**
	* Disposes the group's widgets.
	*/
	public void dispose() {
	if (groupComposite != null && groupComposite.isDisposed() == false)
	groupComposite.dispose();
	}
	/**
	* Returns the link target location entered by the user.
	*
	* @return the link target location entered by the user. null if the user
	* chose not to create a link.
	*/
	public String getLinkTarget() {
	if (createLink)
	return linkTarget;

	return null;
	}
	/**
	* Opens a file or directory browser depending on the link type.
	*/
	private void handleLinkTargetBrowseButtonPressed() {
	File file = null;
	String selection = null;

	if ("".equals(linkTarget) == false) { //$NON-NLS-1$
	file = new File(linkTarget);
	if (file.exists() == false)
	file = null;
	}
	if (type == IResource.FILE) {
	FileDialog dialog = new FileDialog(linkTargetField.getShell());
	if (file != null) {
	if (file.isFile())
	dialog.setFileName(linkTarget);
	else
	dialog.setFilterPath(linkTarget);
	}
	selection = dialog.open();
	}
	else {
	DirectoryDialog dialog = new DirectoryDialog(linkTargetField.getShell());
	if (file != null) {
	String path = linkTarget;
	if (file.isFile())
	path = file.getParent();
	if (path != null)
	dialog.setFilterPath(path);
	}
	dialog.setMessage(IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.targetSelectionLabel")); //$NON-NLS-1$
	selection = dialog.open();
	}
	if (selection != null)
	linkTargetField.setText(selection);
	}
	/**
	* Opens a path variable selection dialog
	*/
	private void handleVariablesButtonPressed() {
	int variableTypes = IResource.FOLDER;

	// allow selecting file and folder variables when creating a
	// linked file
	if (type == IResource.FILE)
	variableTypes \|= IResource.FILE;

	PathVariableSelectionDialog dialog =
	new PathVariableSelectionDialog(linkTargetField.getShell(), variableTypes);
	if (dialog.open() == IDialogConstants.OK_ID) {
	String[] variableNames = (String[]) dialog.getResult();
	if (variableNames != null && variableNames.length == 1)
	linkTargetField.setText(variableNames[0]);
	}
	}
	/**
	* Initializes the computation of horizontal and vertical dialog units
	* based on the size of current font.
	* <p>
	* This method must be called before <code>setButtonLayoutData</code>
	* is called.
	* </p>
	*
	* @param control a control from which to obtain the current font
	*/
	protected void initializeDialogUnits(Control control) {
	// Compute and store a font metric
	GC gc = new GC(control);
	gc.setFont(control.getFont());
	fontMetrics = gc.getFontMetrics();
	gc.dispose();
	}
	/**
	* Tries to resolve the value entered in the link target field as
	* a variable, if the value is a relative path.
	* Displays the resolved value if the entered value is a variable.
	*/
	private void resolveVariable() {
	IPathVariableManager pathVariableManager = ResourcesPlugin.getWorkspace().getPathVariableManager();
	IPath path = new Path(linkTarget);
	IPath resolvedPath = pathVariableManager.resolvePath(path);

	if (path.equals(resolvedPath)) {
	resolvedPathLabelText.setVisible(false);
	resolvedPathLabelData.setVisible(false);
	} else {
	resolvedPathLabelText.setVisible(true);
	resolvedPathLabelData.setVisible(true);
	}
	resolvedPathLabelData.setText(resolvedPath.toOSString());
	}
	/**
	* Sets the <code>GridData</code> on the specified button to
	* be one that is spaced for the current dialog page units. The
	* method <code>initializeDialogUnits</code> must be called once
	* before calling this method for the first time.
	*
	* @param button the button to set the <code>GridData</code>
	* @return the <code>GridData</code> set on the specified button
	*/
	private GridData setButtonLayoutData(Button button) {
	GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	data.heightHint = Dialog.convertVerticalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_HEIGHT);
	int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_WIDTH);
	data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
	button.setLayoutData(data);
	return data;
	}
	/**
	* Sets the value of the link target field
	*
	* @param target the value of the link target field
	*/
	public void setLinkTarget(String target) {
	linkTarget = target;
	if (linkTargetField != null && linkTargetField.isDisposed() == false)
	linkTargetField.setText(target);
	}
	/**
	* Validates the type of the given file against the link type specified
	* in the constructor.
	*
	* @param linkTargetFile file to validate
	* @return IStatus indicating the validation result. IStatus.OK if the
	* given file is valid.
	*/
	private IStatus validateFileType(File linkTargetFile) {
	if (type == IResource.FILE && linkTargetFile.isFile() == false) {
	return createStatus(
	IStatus.ERROR,
	IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNotFile")); //$NON-NLS-1$
	} else if (type == IResource.FOLDER && linkTargetFile.isDirectory() == false) {
	return createStatus(
	IStatus.ERROR,
	IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNotFolder")); //$NON-NLS-1$
	}
	return createStatus(IStatus.OK, ""); //$NON-NLS-1$
	}
	/**
	* Validates this page's controls.
	*
	* @return IStatus indicating the validation result. IStatus.OK if the
	* specified link target is valid given the linkHandle.
	*/
	public IStatus validateLinkLocation(IResource linkHandle) {
	if (linkTargetField == null \|\| linkTargetField.isDisposed())
	return createStatus(IStatus.OK, ""); //$NON-NLS-1$

	IWorkspace workspace = IDEWorkbenchPlugin.getPluginWorkspace();
	IPath path = new Path(linkTarget);

	if (createLink == false)
	return createStatus(IStatus.OK, ""); //$NON-NLS-1$

	IStatus locationStatus = workspace.validateLinkLocation(linkHandle, path);
	if (locationStatus.getSeverity() == IStatus.ERROR)
	return locationStatus;

	// use the resolved link target name
	String resolvedLinkTarget = resolvedPathLabelData.getText();
	path = new Path(resolvedLinkTarget);
	File linkTargetFile = new Path(resolvedLinkTarget).toFile();
	if (linkTargetFile.exists()) {
	IStatus fileTypeStatus = validateFileType(linkTargetFile);
	if (fileTypeStatus.isOK() == false)
	return fileTypeStatus;
	} else if (locationStatus.getSeverity() == IStatus.OK) {
	// locationStatus takes precedence over missing location warning.
	return createStatus(
	IStatus.WARNING,
	IDEWorkbenchMessages.getString("CreateLinkedResourceGroup.linkTargetNonExistent")); //$NON-NLS-1$
	}
	return locationStatus;
	}
	}