rms/org.eclipse.ptp.rm.slurm.ui/src/org/eclipse/ptp/rm/slurm/ui/wizards/SLURMConfigurationWizardPage.java - ptp/org.eclipse.ptp - Git at Google

 /*******************************************************************************
  * Copyright (c) 2008,2009
  * School of Computer, National University of Defense Technology, P.R.China
  *
  * 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:
  * 			Peichang Shi <pcmutates@163.com>/<pcshi@nudt.edu.cn>
  *******************************************************************************/
 package org.eclipse.ptp.rm.slurm.ui.wizards;

 import java.lang.reflect.InvocationTargetException;

 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.dialogs.ErrorDialog;
 import org.eclipse.jface.dialogs.ProgressMonitorDialog;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.jface.preference.FieldEditor;
 import org.eclipse.jface.util.IPropertyChangeListener;
 import org.eclipse.jface.util.PropertyChangeEvent;
 import org.eclipse.ptp.remote.core.IRemoteConnection;
 import org.eclipse.ptp.remote.core.IRemoteServices;
 import org.eclipse.ptp.remote.core.PTPRemoteCorePlugin;
 import org.eclipse.ptp.remote.core.exception.RemoteConnectionException;
 import org.eclipse.ptp.remote.ui.IRemoteUIFileManager;
 import org.eclipse.ptp.remote.ui.IRemoteUIServices;
 import org.eclipse.ptp.remote.ui.PTPRemoteUIPlugin;
 import org.eclipse.ptp.rm.slurm.core.rmsystem.SLURMResourceManagerConfiguration;
 import org.eclipse.ptp.rm.slurm.ui.Activator;
 import org.eclipse.ptp.rm.slurm.ui.messages.Messages;
 import org.eclipse.ptp.ui.wizards.RMConfigurationWizard;
 import org.eclipse.ptp.ui.wizards.RMConfigurationWizardPage;
 import org.eclipse.ptp.utils.ui.swt.SWTUtil;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;

 public class SLURMConfigurationWizardPage extends RMConfigurationWizardPage {

 	protected class WidgetListener extends SelectionAdapter implements ModifyListener, IPropertyChangeListener
 	{
 		public void modifyText(ModifyEvent evt) {
 			Object source = evt.getSource();
 			if(!loading && (source == pathText || source == argsText)) {
 				updatePage();
 			}
 		}

 		public void propertyChange(PropertyChangeEvent event) {
 			if (event.getProperty().equals(FieldEditor.IS_VALID)) {
 				updatePage();
 			}
 		}

 		public void widgetSelected(SelectionEvent e) {
 			Object source = e.getSource();
 			if (source == browseButton) {
 				handlePathBrowseButtonSelected();
 			} else {
 				updateSettings();
 				updatePage();
 			}
 		}
 	}

 	public static final String EMPTY_STRING = ""; //$NON-NLS-1$

 	private SLURMResourceManagerConfiguration config;
 	private String slurmdPath = EMPTY_STRING;
 	private String slurmdArgs = EMPTY_STRING;
 	private IRemoteServices remoteServices = null;
 	private IRemoteConnection connection = null;
 	private boolean loading = true;
 	private boolean isValid;
 	private boolean useDefaults;
 	private Text pathText = null;

 	private Text argsText = null;
 	private Button browseButton = null;
 	private Button defaultButton = null;
 	private WidgetListener listener = new WidgetListener();

 	public SLURMConfigurationWizardPage(RMConfigurationWizard wizard) {
 		super(wizard, Messages.SLURMConfigurationWizardPage_name);
 		setTitle(Messages.SLURMConfigurationWizardPage_title);
 		setDescription(Messages.SLURMConfigurationWizardPage_description);
 		setPageComplete(true);
 		isValid = true;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ptp.ui.wizards.RMConfigurationWizardPage#createControl(org.eclipse.swt.widgets.Composite)
 	 */
 	public void createControl(Composite parent) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout topLayout = new GridLayout();
 	    composite.setLayout(topLayout);
 		createContents(composite);
 		setControl(composite);
 	}

 	/**
 	 * Save the current state in the RM configuration. This is called whenever
 	 * anything is changed.
 	 *
 	 * @return
 	 */
 	public boolean performOk()
 	{
 		store();
 		config.setUseDefaults(useDefaults);
 		if (!useDefaults) {
 			config.setSlurmdPath(slurmdPath);
 			config.setSlurmdArgs(slurmdArgs);
 		}
 		return true;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.dialogs.DialogPage#setVisible(boolean)
 	 */
 	@Override
 	public void setVisible(boolean visible) {
 		if (visible) {
 			initContents();
 		}
 		super.setVisible(visible);
 	}

 	/**
 	 * Create the contents of the wizard page.
 	 *
 	 * @param parent
 	 * @param colSpan
 	 */
 	private void createContents(Composite parent) {
 		/*
 		 * Composite for remote provider and proxy location combo's
 		 */
 		Composite contents = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 3;
 		layout.marginWidth = 0;
 		contents.setLayout(layout);
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 3;
 		contents.setLayoutData(gd);

 		/*
 		 * Default
 		 */
 		defaultButton = createCheckButton(contents, Messages.SLURMConfigurationWizardPage_defaultButton);
 		defaultButton.addSelectionListener(listener);
 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 3;
 		defaultButton.setLayoutData(gd);

 		/*
 		 * SLURMD path
 		 */
 		Label label = new Label(contents, SWT.NONE);
 		label.setText(Messages.SLURMConfigurationWizardPage_path);

 		pathText = new Text(contents, SWT.SINGLE | SWT.BORDER);
 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 1;
 		gd.widthHint = 60;
 		pathText.setLayoutData(gd);
 		pathText.addModifyListener(listener);

 		browseButton = SWTUtil.createPushButton(contents, Messages.SLURMConfigurationWizardPage_browseButton, null);
 		browseButton.addSelectionListener(listener);

 		/*
 		 * SLURMD args
 		 */
 		label = new Label(contents, SWT.NONE);
 		label.setText(Messages.SLURMConfigurationWizardPage_arguments);

 		argsText = new Text(contents, SWT.SINGLE | SWT.BORDER);
 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 2;
 		argsText.setLayoutData(gd);
 		argsText.addModifyListener(listener);
 	}

 	/**
 	 * Initialize the contents of the controls.
 	 */
 	private void initContents() {
 		loading = true;
 		config = (SLURMResourceManagerConfiguration)getConfigurationWizard().getConfiguration();
 		loadSaved();
 		updateSettings();
 		defaultSetting();
 		loading = false;
 		updatePage();
 	}

 	/**
 	 * Load the initial wizard state from the configuration settings.
 	 */
 	private void loadSaved()
 	{
 		useDefaults = config.useDefaults();
 		slurmdPath = config.getSlurmdPath();
 		slurmdArgs = config.getSlurmdArgs();
 	}

 	/**
 	 * @param b
 	 */
 	private void setValid(boolean b) {
 		isValid = b;
 		setPageComplete(isValid);
 	}

 	/**
 	 *
 	 */
 	private void store()
 	{
 		if (!loading) {
 			if (defaultButton != null) {
 				useDefaults = defaultButton.getSelection();
 			}
 			if (pathText != null) {
 				slurmdPath = pathText.getText();
 			}
 			if (argsText != null) {
 				slurmdArgs = argsText.getText();
 			}
 		}
 	}

 	/**
 	 * Update wizard UI selections from settings. This should be called whenever any
 	 * settings are changed.
 	 */
 	private void updateSettings() {
 		store();
 		pathText.setEnabled(!useDefaults);
 		argsText.setEnabled(!useDefaults);
 		browseButton.setEnabled(!useDefaults);
 	}

 	/**
 	 * Convenience method for creating a button widget.
 	 *
 	 * @param parent
 	 * @param label
 	 * @param type
 	 * @return the button widget
 	 */
 	protected Button createButton(Composite parent, String label, int type) {
 		Button button = new Button(parent, type);
 		button.setText(label);
 		GridData data = new GridData();
 		button.setLayoutData(data);
 		return button;
 	}

 	/**
 	 * Convenience method for creating a check button widget.
 	 *
 	 * @param parent
 	 * @param label
 	 * @return the check button widget
 	 */
 	protected Button createCheckButton(Composite parent, String label) {
 		return createButton(parent, label, SWT.CHECK | SWT.LEFT);
 	}

 	/**
 	 * Convenience method for creating a grid layout.
 	 *
 	 * @param columns
 	 * @param isEqual
 	 * @param mh
 	 * @param mw
 	 * @return the new grid layout
 	 */
 	protected GridLayout createGridLayout(int columns, boolean isEqual, int mh, int mw)  {
 		GridLayout gridLayout = new GridLayout();
 		gridLayout.numColumns = columns;
 		gridLayout.makeColumnsEqualWidth = isEqual;
 		gridLayout.marginHeight = mh;
 		gridLayout.marginWidth = mw;
 		return gridLayout;
 	}

 	/**
 	 * Creates an new radio button instance and sets the default
 	 * layout data.
 	 *
 	 * @param group  the composite in which to create the radio button
 	 * @param label  the string to set into the radio button
 	 * @param value  the string to identify radio button
 	 * @return the new radio button
 	 */
 	protected Button createRadioButton(Composite parent, String label, String value, SelectionListener listener) {
 		Button button = createButton(parent, label, SWT.RADIO | SWT.LEFT);
 		button.setData((null == value) ? label : value);
 		GridData data = new GridData(GridData.FILL_HORIZONTAL);
 		data.horizontalAlignment = GridData.FILL;
 		data.verticalAlignment = GridData.BEGINNING;
 		button.setLayoutData(data);
 		if(null != listener) {
 			button.addSelectionListener(listener);
 		}
 		return button;
 	}

 	/**
 	 *
 	 */
 	protected void defaultSetting()
 	{
 		defaultButton.setSelection(useDefaults);
 		pathText.setText(slurmdPath);
 		argsText.setText(slurmdArgs);
 	}

 	/**
 	 * Clean up the content of a text field.
 	 *
 	 * @param text
 	 * @return cleaned up text.
 	 */
 	protected String getFieldContent(String text)
 	{
 		if (text.trim().length() == 0 || text.equals(EMPTY_STRING))
 			return null;

 		return text;
 	}

 	/**
 	 * Show a dialog that lets the user select a file.
 	 */
 	protected void handlePathBrowseButtonSelected()
 	{
 		/*
 		 * Need to do this here because the connection may have been changed
 		 * by the previous wizard page
 		 */
 		String rmID = config.getRemoteServicesId();
 		if (rmID != null) {
 			remoteServices = PTPRemoteCorePlugin.getDefault().getRemoteServices(rmID);
 			String conn = config.getConnectionName();
 			if (remoteServices != null && conn != null) {
 				connection = remoteServices.getConnectionManager().getConnection(conn);
 			}
 		}

 		if (connection != null) {
 			if (!connection.isOpen()) {
 				IRunnableWithProgress op = new IRunnableWithProgress() {
 					public void run(IProgressMonitor monitor)
 							throws InvocationTargetException,
 							InterruptedException {
 						try {
 							connection.open(monitor);
 						} catch (RemoteConnectionException e) {
 							ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
 									Messages.SLURMConfigurationWizardPage_connection_error_msg,
 									new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
 						}
 					}

 				};
 				try {
 					new ProgressMonitorDialog(getShell()).run(true, true, op);
 				} catch (InvocationTargetException e) {
 					ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
 							Messages.SLURMConfigurationWizardPage_connection_error_msg,
 							new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
 				} catch (InterruptedException e) {
 					ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
 							Messages.SLURMConfigurationWizardPage_connection_error_msg,
 							new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
 				}
 			}
 			IRemoteUIServices remoteUIServices = PTPRemoteUIPlugin.getDefault().getRemoteUIServices(remoteServices);
 			IRemoteUIFileManager fileMgr = remoteUIServices.getUIFileManager();

 			String initialPath = "//"; // Start at root since SLURMD is probably installed in the system somewhere //$NON-NLS-1$
 			IPath selectedPath = fileMgr.browseFile(getControl().getShell(), Messages.SLURMConfigurationWizardPage_select, initialPath);
 			if (selectedPath != null) {
 				pathText.setText(selectedPath.toString());
 			}
 		}
 	}

 	/**
 	 * @return
 	 */
 	protected boolean isValidSetting()
 	{
 		if (defaultButton != null && defaultButton.getSelection()) {
 			return true;
 		}

 		if (pathText != null) {
 			String name = getFieldContent(pathText.getText());
 			if (name == null) {
 				setErrorMessage(Messages.SLURMConfigurationWizardPage_invalid);
 				return false;
 			}
 		}

 		return true;
 	}

 	/**
 	 * @param style
 	 * @param space
 	 * @return
 	 */
 	protected GridData spanGridData(int style, int space)
 	{
 		GridData gd = null;
 		if (style == -1)
 			gd = new GridData();
 		else
 			gd = new GridData(style);
 		gd.horizontalSpan = space;
 		return gd;
 	}

 	/**
 	 *
 	 */
 	protected void updatePage()
 	{
 		setErrorMessage(null);
 		setMessage(null);

 		if (!isValidSetting()) {
 			setValid(false);
 		} else {
 			performOk();
 			setValid(true);
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2008,2009
	* School of Computer, National University of Defense Technology, P.R.China
	*
	* 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:
	* Peichang Shi <pcmutates@163.com>/<pcshi@nudt.edu.cn>
	*******************************************************************************/
	package org.eclipse.ptp.rm.slurm.ui.wizards;

	import java.lang.reflect.InvocationTargetException;

	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.jface.dialogs.ErrorDialog;
	import org.eclipse.jface.dialogs.ProgressMonitorDialog;
	import org.eclipse.jface.operation.IRunnableWithProgress;
	import org.eclipse.jface.preference.FieldEditor;
	import org.eclipse.jface.util.IPropertyChangeListener;
	import org.eclipse.jface.util.PropertyChangeEvent;
	import org.eclipse.ptp.remote.core.IRemoteConnection;
	import org.eclipse.ptp.remote.core.IRemoteServices;
	import org.eclipse.ptp.remote.core.PTPRemoteCorePlugin;
	import org.eclipse.ptp.remote.core.exception.RemoteConnectionException;
	import org.eclipse.ptp.remote.ui.IRemoteUIFileManager;
	import org.eclipse.ptp.remote.ui.IRemoteUIServices;
	import org.eclipse.ptp.remote.ui.PTPRemoteUIPlugin;
	import org.eclipse.ptp.rm.slurm.core.rmsystem.SLURMResourceManagerConfiguration;
	import org.eclipse.ptp.rm.slurm.ui.Activator;
	import org.eclipse.ptp.rm.slurm.ui.messages.Messages;
	import org.eclipse.ptp.ui.wizards.RMConfigurationWizard;
	import org.eclipse.ptp.ui.wizards.RMConfigurationWizardPage;
	import org.eclipse.ptp.utils.ui.swt.SWTUtil;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;

	public class SLURMConfigurationWizardPage extends RMConfigurationWizardPage {

	protected class WidgetListener extends SelectionAdapter implements ModifyListener, IPropertyChangeListener
	{
	public void modifyText(ModifyEvent evt) {
	Object source = evt.getSource();
	if(!loading && (source == pathText \|\| source == argsText)) {
	updatePage();
	}
	}

	public void propertyChange(PropertyChangeEvent event) {
	if (event.getProperty().equals(FieldEditor.IS_VALID)) {
	updatePage();
	}
	}

	public void widgetSelected(SelectionEvent e) {
	Object source = e.getSource();
	if (source == browseButton) {
	handlePathBrowseButtonSelected();
	} else {
	updateSettings();
	updatePage();
	}
	}
	}

	public static final String EMPTY_STRING = ""; //$NON-NLS-1$

	private SLURMResourceManagerConfiguration config;
	private String slurmdPath = EMPTY_STRING;
	private String slurmdArgs = EMPTY_STRING;
	private IRemoteServices remoteServices = null;
	private IRemoteConnection connection = null;
	private boolean loading = true;
	private boolean isValid;
	private boolean useDefaults;
	private Text pathText = null;

	private Text argsText = null;
	private Button browseButton = null;
	private Button defaultButton = null;
	private WidgetListener listener = new WidgetListener();

	public SLURMConfigurationWizardPage(RMConfigurationWizard wizard) {
	super(wizard, Messages.SLURMConfigurationWizardPage_name);
	setTitle(Messages.SLURMConfigurationWizardPage_title);
	setDescription(Messages.SLURMConfigurationWizardPage_description);
	setPageComplete(true);
	isValid = true;
	}

	/* (non-Javadoc)
	* @see org.eclipse.ptp.ui.wizards.RMConfigurationWizardPage#createControl(org.eclipse.swt.widgets.Composite)
	*/
	public void createControl(Composite parent) {
	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout topLayout = new GridLayout();
	composite.setLayout(topLayout);
	createContents(composite);
	setControl(composite);
	}

	/**
	* Save the current state in the RM configuration. This is called whenever
	* anything is changed.
	*
	* @return
	*/
	public boolean performOk()
	{
	store();
	config.setUseDefaults(useDefaults);
	if (!useDefaults) {
	config.setSlurmdPath(slurmdPath);
	config.setSlurmdArgs(slurmdArgs);
	}
	return true;
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.dialogs.DialogPage#setVisible(boolean)
	*/
	@Override
	public void setVisible(boolean visible) {
	if (visible) {
	initContents();
	}
	super.setVisible(visible);
	}

	/**
	* Create the contents of the wizard page.
	*
	* @param parent
	* @param colSpan
	*/
	private void createContents(Composite parent) {
	/*
	* Composite for remote provider and proxy location combo's
	*/
	Composite contents = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 3;
	layout.marginWidth = 0;
	contents.setLayout(layout);
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 3;
	contents.setLayoutData(gd);

	/*
	* Default
	*/
	defaultButton = createCheckButton(contents, Messages.SLURMConfigurationWizardPage_defaultButton);
	defaultButton.addSelectionListener(listener);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 3;
	defaultButton.setLayoutData(gd);

	/*
	* SLURMD path
	*/
	Label label = new Label(contents, SWT.NONE);
	label.setText(Messages.SLURMConfigurationWizardPage_path);

	pathText = new Text(contents, SWT.SINGLE \| SWT.BORDER);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 1;
	gd.widthHint = 60;
	pathText.setLayoutData(gd);
	pathText.addModifyListener(listener);

	browseButton = SWTUtil.createPushButton(contents, Messages.SLURMConfigurationWizardPage_browseButton, null);
	browseButton.addSelectionListener(listener);

	/*
	* SLURMD args
	*/
	label = new Label(contents, SWT.NONE);
	label.setText(Messages.SLURMConfigurationWizardPage_arguments);

	argsText = new Text(contents, SWT.SINGLE \| SWT.BORDER);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	argsText.setLayoutData(gd);
	argsText.addModifyListener(listener);
	}

	/**
	* Initialize the contents of the controls.
	*/
	private void initContents() {
	loading = true;
	config = (SLURMResourceManagerConfiguration)getConfigurationWizard().getConfiguration();
	loadSaved();
	updateSettings();
	defaultSetting();
	loading = false;
	updatePage();
	}

	/**
	* Load the initial wizard state from the configuration settings.
	*/
	private void loadSaved()
	{
	useDefaults = config.useDefaults();
	slurmdPath = config.getSlurmdPath();
	slurmdArgs = config.getSlurmdArgs();
	}

	/**
	* @param b
	*/
	private void setValid(boolean b) {
	isValid = b;
	setPageComplete(isValid);
	}

	/**
	*
	*/
	private void store()
	{
	if (!loading) {
	if (defaultButton != null) {
	useDefaults = defaultButton.getSelection();
	}
	if (pathText != null) {
	slurmdPath = pathText.getText();
	}
	if (argsText != null) {
	slurmdArgs = argsText.getText();
	}
	}
	}

	/**
	* Update wizard UI selections from settings. This should be called whenever any
	* settings are changed.
	*/
	private void updateSettings() {
	store();
	pathText.setEnabled(!useDefaults);
	argsText.setEnabled(!useDefaults);
	browseButton.setEnabled(!useDefaults);
	}

	/**
	* Convenience method for creating a button widget.
	*
	* @param parent
	* @param label
	* @param type
	* @return the button widget
	*/
	protected Button createButton(Composite parent, String label, int type) {
	Button button = new Button(parent, type);
	button.setText(label);
	GridData data = new GridData();
	button.setLayoutData(data);
	return button;
	}

	/**
	* Convenience method for creating a check button widget.
	*
	* @param parent
	* @param label
	* @return the check button widget
	*/
	protected Button createCheckButton(Composite parent, String label) {
	return createButton(parent, label, SWT.CHECK \| SWT.LEFT);
	}

	/**
	* Convenience method for creating a grid layout.
	*
	* @param columns
	* @param isEqual
	* @param mh
	* @param mw
	* @return the new grid layout
	*/
	protected GridLayout createGridLayout(int columns, boolean isEqual, int mh, int mw) {
	GridLayout gridLayout = new GridLayout();
	gridLayout.numColumns = columns;
	gridLayout.makeColumnsEqualWidth = isEqual;
	gridLayout.marginHeight = mh;
	gridLayout.marginWidth = mw;
	return gridLayout;
	}

	/**
	* Creates an new radio button instance and sets the default
	* layout data.
	*
	* @param group the composite in which to create the radio button
	* @param label the string to set into the radio button
	* @param value the string to identify radio button
	* @return the new radio button
	*/
	protected Button createRadioButton(Composite parent, String label, String value, SelectionListener listener) {
	Button button = createButton(parent, label, SWT.RADIO \| SWT.LEFT);
	button.setData((null == value) ? label : value);
	GridData data = new GridData(GridData.FILL_HORIZONTAL);
	data.horizontalAlignment = GridData.FILL;
	data.verticalAlignment = GridData.BEGINNING;
	button.setLayoutData(data);
	if(null != listener) {
	button.addSelectionListener(listener);
	}
	return button;
	}

	/**
	*
	*/
	protected void defaultSetting()
	{
	defaultButton.setSelection(useDefaults);
	pathText.setText(slurmdPath);
	argsText.setText(slurmdArgs);
	}

	/**
	* Clean up the content of a text field.
	*
	* @param text
	* @return cleaned up text.
	*/
	protected String getFieldContent(String text)
	{
	if (text.trim().length() == 0 \|\| text.equals(EMPTY_STRING))
	return null;

	return text;
	}

	/**
	* Show a dialog that lets the user select a file.
	*/
	protected void handlePathBrowseButtonSelected()
	{
	/*
	* Need to do this here because the connection may have been changed
	* by the previous wizard page
	*/
	String rmID = config.getRemoteServicesId();
	if (rmID != null) {
	remoteServices = PTPRemoteCorePlugin.getDefault().getRemoteServices(rmID);
	String conn = config.getConnectionName();
	if (remoteServices != null && conn != null) {
	connection = remoteServices.getConnectionManager().getConnection(conn);
	}
	}

	if (connection != null) {
	if (!connection.isOpen()) {
	IRunnableWithProgress op = new IRunnableWithProgress() {
	public void run(IProgressMonitor monitor)
	throws InvocationTargetException,
	InterruptedException {
	try {
	connection.open(monitor);
	} catch (RemoteConnectionException e) {
	ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
	Messages.SLURMConfigurationWizardPage_connection_error_msg,
	new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
	}
	}

	};
	try {
	new ProgressMonitorDialog(getShell()).run(true, true, op);
	} catch (InvocationTargetException e) {
	ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
	Messages.SLURMConfigurationWizardPage_connection_error_msg,
	new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
	} catch (InterruptedException e) {
	ErrorDialog.openError(getShell(), Messages.SLURMConfigurationWizardPage_connection_error,
	Messages.SLURMConfigurationWizardPage_connection_error_msg,
	new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage()));
	}
	}
	IRemoteUIServices remoteUIServices = PTPRemoteUIPlugin.getDefault().getRemoteUIServices(remoteServices);
	IRemoteUIFileManager fileMgr = remoteUIServices.getUIFileManager();

	String initialPath = "//"; // Start at root since SLURMD is probably installed in the system somewhere //$NON-NLS-1$
	IPath selectedPath = fileMgr.browseFile(getControl().getShell(), Messages.SLURMConfigurationWizardPage_select, initialPath);
	if (selectedPath != null) {
	pathText.setText(selectedPath.toString());
	}
	}
	}

	/**
	* @return
	*/
	protected boolean isValidSetting()
	{
	if (defaultButton != null && defaultButton.getSelection()) {
	return true;
	}

	if (pathText != null) {
	String name = getFieldContent(pathText.getText());
	if (name == null) {
	setErrorMessage(Messages.SLURMConfigurationWizardPage_invalid);
	return false;
	}
	}

	return true;
	}

	/**
	* @param style
	* @param space
	* @return
	*/
	protected GridData spanGridData(int style, int space)
	{
	GridData gd = null;
	if (style == -1)
	gd = new GridData();
	else
	gd = new GridData(style);
	gd.horizontalSpan = space;
	return gd;
	}

	/**
	*
	*/
	protected void updatePage()
	{
	setErrorMessage(null);
	setMessage(null);

	if (!isValidSetting()) {
	setValid(false);
	} else {
	performOk();
	setValid(true);
	}
	}
	}