org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/preferences/SimpleLaunchVariablePreferencePage.java - gerrit/platform/eclipse.platform.debug - 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.debug.internal.ui.preferences;

 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;

 import org.eclipse.debug.core.DebugPlugin;
 import org.eclipse.debug.core.variables.ILaunchVariableManager;
 import org.eclipse.debug.core.variables.ISimpleLaunchVariable;
 import org.eclipse.debug.internal.ui.IDebugHelpContextIds;
 import org.eclipse.debug.internal.ui.SWTUtil;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.jface.viewers.ColumnLayoutData;
 import org.eclipse.jface.viewers.ColumnWeightData;
 import org.eclipse.jface.viewers.DoubleClickEvent;
 import org.eclipse.jface.viewers.IColorProvider;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITableLabelProvider;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.TableLayout;
 import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerSorter;
 import org.eclipse.jface.window.Window;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.KeyAdapter;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.Image;
 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.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.eclipse.ui.help.WorkbenchHelp;

 /**
  * Preference page for creating and configuring simple
  * launch variables.
  *
  * @see org.eclipse.debug.core.variables.ISimpleLaunchVariable
  * @see org.eclipse.debug.core.variables.ISimpleVariableRegistry
  */
 public class SimpleLaunchVariablePreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

 	private TableViewer variableTable;
 	protected Button envAddButton;
 	protected Button envEditButton;
 	protected Button envRemoveButton;

 	protected SimpleVariableContentProvider variableContentProvider= new SimpleVariableContentProvider();

 	protected static final String NAME_LABEL= DebugPreferencesMessages.getString("SimpleVariablePreferencePage.10"); //$NON-NLS-1$
 	protected static final String VALUE_LABEL = DebugPreferencesMessages.getString("SimpleVariablePreferencePage.11"); //$NON-NLS-1$
 	protected static final String DESCRIPTION_LABEL = DebugPreferencesMessages.getString("SimpleVariablePreferencePage.12"); //$NON-NLS-1$

 	protected static String[] variableTableColumnProperties= {
 		"variable", //$NON-NLS-1$
 		"value", //$NON-NLS-1$
 		"description" //$NON-NLS-1$
 	};
 	protected String[] variableTableColumnHeaders= {
 		DebugPreferencesMessages.getString("SimpleVariablePreferencePage.3"), //$NON-NLS-1$
 		DebugPreferencesMessages.getString("SimpleVariablePreferencePage.4"), //$NON-NLS-1$
 		DebugPreferencesMessages.getString("SimpleVariablePreferencePage.5") //$NON-NLS-1$
 	};
 	protected ColumnLayoutData[] variableTableColumnLayouts= {
 		new ColumnWeightData(33),
 		new ColumnWeightData(33),
 		new ColumnWeightData(34)
 	};

 	public SimpleLaunchVariablePreferencePage() {
 		setDescription(DebugPreferencesMessages.getString("SimpleVariablePreferencePage.6")); //$NON-NLS-1$
 	}

 	/**
 	 * @see PreferencePage#createControl(Composite)
 	 */
 	public void createControl(Composite parent) {
 		super.createControl(parent);
 		WorkbenchHelp.setHelp(getControl(), IDebugHelpContextIds.SIMPLE_VARIABLE_PREFERENCE_PAGE);
 	}

 	protected Control createContents(Composite parent) {
 		noDefaultAndApplyButton();
 		Font font= parent.getFont();
 		//The main composite
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.marginHeight=0;
 		layout.marginWidth=0;
 		layout.numColumns= 2;
 		composite.setLayout(layout);
 		composite.setFont(font);

 		createTable(composite);
 		createButtons(composite);
 		return composite;
 	}

 	/**
 	 * Creates and configures the table containing launch configuration variables
 	 * and their associated value.
 	 */
 	private void createTable(Composite parent) {
 		Font font= parent.getFont();
 		// Create table composite
 		Composite tableComposite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.marginHeight = 0;
 		layout.marginWidth = 0;
 		layout.numColumns = 1;
 		GridData gridData = new GridData(GridData.FILL_BOTH);
 		gridData.heightHint = 150;
 		gridData.widthHint = 400;
 		tableComposite.setLayout(layout);
 		tableComposite.setLayoutData(gridData);
 		tableComposite.setFont(font);
 		// Create table
 		variableTable = new TableViewer(tableComposite, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.MULTI | SWT.FULL_SELECTION);
 		Table table = variableTable.getTable();
 		TableLayout tableLayout = new TableLayout();
 		table.setLayout(tableLayout);
 		table.setHeaderVisible(true);
 		table.setFont(font);
 		gridData = new GridData(GridData.FILL_BOTH);
 		variableTable.getControl().setLayoutData(gridData);
 		variableTable.setContentProvider(variableContentProvider);
 		variableTable.setColumnProperties(variableTableColumnProperties);
 		variableTable.addSelectionChangedListener(new ISelectionChangedListener() {
 			public void selectionChanged(SelectionChangedEvent event) {
 				handleTableSelectionChanged(event);
 			}
 		});

 		variableTable.addDoubleClickListener(new IDoubleClickListener() {
 			public void doubleClick(DoubleClickEvent event) {
 				handleEditButtonPressed();
 			}
 		});
 		variableTable.getTable().addKeyListener(new KeyAdapter() {
 			public void keyPressed(KeyEvent event) {
 				if (event.character == SWT.DEL && event.stateMask == 0) {
 					handleRemoveButtonPressed();
 				}
 			}
 		});

 		// Create columns
 		for (int i = 0; i < variableTableColumnHeaders.length; i++) {
 			tableLayout.addColumnData(variableTableColumnLayouts[i]);
 			TableColumn tc = new TableColumn(table, SWT.NONE, i);
 			tc.setResizable(variableTableColumnLayouts[i].resizable);
 			tc.setText(variableTableColumnHeaders[i]);
 		}
 		variableTable.setInput(getVariableManager());
 		variableTable.setLabelProvider(new SimpleVariableLabelProvider());
 	}

 	/**
 	 * Creates the new/edit/remove buttons for the variable table
 	 * @param parent the composite in which the buttons should be created
 	 */
 	private void createButtons(Composite parent) {
 		// Create button composite
 		Composite buttonComposite = new Composite(parent, SWT.NONE);
 		GridLayout glayout = new GridLayout();
 		glayout.marginHeight = 0;
 		glayout.marginWidth = 0;
 		glayout.numColumns = 1;
 		GridData gdata = new GridData(GridData.VERTICAL_ALIGN_BEGINNING | GridData.HORIZONTAL_ALIGN_END);
 		buttonComposite.setLayout(glayout);
 		buttonComposite.setLayoutData(gdata);
 		buttonComposite.setFont(parent.getFont());

 		// Create a little vertical space
 		Label label= new Label(buttonComposite, SWT.NONE);
 		GridData gd= new GridData();
 		gd.horizontalSpan= 1;
 		label.setLayoutData(gd);
 		// Create buttons
 		envAddButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.7"), null); //$NON-NLS-1$
 		envAddButton.addSelectionListener(new SelectionAdapter()
 		{
 			public void widgetSelected(SelectionEvent event) {
 				handleAddButtonPressed();
 			}
 		});
 		envEditButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.8"), null); //$NON-NLS-1$
 		envEditButton.addSelectionListener(new SelectionAdapter()
 		{
 			public void widgetSelected(SelectionEvent event) {
 				handleEditButtonPressed();
 			}
 		});
 		envEditButton.setEnabled(false);
 		envRemoveButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.9"), null); //$NON-NLS-1$
 		envRemoveButton.addSelectionListener(new SelectionAdapter()
 		{
 			public void widgetSelected(SelectionEvent event) {
 				handleRemoveButtonPressed();
 			}
 		});
 		envRemoveButton.setEnabled(false);
 	}

 	private void handleAddButtonPressed() {
 		MultipleInputDialog dialog= new MultipleInputDialog(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.13"), new String[] {NAME_LABEL, VALUE_LABEL, DESCRIPTION_LABEL}, null); //$NON-NLS-1$
 		dialog.disallowEmpty(NAME_LABEL);
 		if (dialog.open() != Window.OK) {
 			return;
 		}
 		String name= dialog.getValue(NAME_LABEL).trim();
 		if (name != null && name.length() > 0) {
 			String value= dialog.getValue(VALUE_LABEL);
 			String description= dialog.getValue(DESCRIPTION_LABEL);
 			ISimpleLaunchVariable variable= DebugPlugin.getDefault().getLaunchVariableManager().newSimpleVariable(name, value, description, false);
 			addVariable(variable);
 		}
 	}

 	/**
 	 * Attempts to add the given variable. Returns whether the variable
 	 * was added or not (as when the user answers not to overwrite an
 	 * existing variable).
 	 * @param variable the variable to add
 	 * @return whether the variable was added
 	 */
 	public boolean addVariable(ISimpleLaunchVariable variable) {
 		String name= variable.getName();
 		List editedVariables= variableContentProvider.getEditedVariables();
 		Iterator iter= editedVariables.iterator();
 		while (iter.hasNext()) {
 			ISimpleLaunchVariable currentVariable = (ISimpleLaunchVariable) iter.next();
 			String variableName = currentVariable.getName();
 			if (variableName.equals(name)) {
 				boolean overWrite= MessageDialog.openQuestion(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.15"), MessageFormat.format(DebugPreferencesMessages.getString("SimpleVariablePreferencePage.16"), new String[] {name}));  //$NON-NLS-1$ //$NON-NLS-2$
 				if (!overWrite) {
 					return false;
 				}
 				variableContentProvider.removeVariable(currentVariable);
 				break;
 			}
 		}
 		variableContentProvider.addVariable(variable);
 		variableTable.refresh();
 		return true;
 	}

 	private void handleEditButtonPressed() {
 		IStructuredSelection selection= (IStructuredSelection) variableTable.getSelection();
 		ISimpleLaunchVariable variable= (ISimpleLaunchVariable) selection.getFirstElement();
 		if (variable == null) {
 			return;
 		}
 		String value= variable.getValue();
 		if (value == null) {
 			value= ""; //$NON-NLS-1$
 		}
 		String description= variable.getDescription();
 		if (description == null) {
 			description= ""; //$NON-NLS-1$
 		}
 		String originalName= variable.getName();
 		MultipleInputDialog dialog= new MultipleInputDialog(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.14"), new String[] {NAME_LABEL, VALUE_LABEL, DESCRIPTION_LABEL}, new String[] {originalName, value, description}); //$NON-NLS-1$
 		if (dialog.open() == Window.OK) {
 			String name= dialog.getValue(NAME_LABEL);
 			value= dialog.getValue(VALUE_LABEL);
 			description= dialog.getValue(DESCRIPTION_LABEL);
 			if (!name.equals(originalName)) {
 				if (addVariable(DebugPlugin.getDefault().getLaunchVariableManager().newSimpleVariable(name, value, description, false))) {
 					variableContentProvider.removeVariable(variable);
 					variableTable.refresh();
 				}
 			} else {
 				if (value != null) {
 					variable.setValue(value);
 				}
 				if (description != null) {
 					variable.setDescription(description);
 				}
 				variableTable.update(variable, null);
 			}
 		}
 	}

 	/**
 	 * Remove the selection variables.
 	 */
 	private void handleRemoveButtonPressed() {
 		IStructuredSelection selection= (IStructuredSelection) variableTable.getSelection();
 		List variablesToRemove= selection.toList();
 		StringBuffer contributedVariablesToRemove= new StringBuffer();
 		Iterator iter= variablesToRemove.iterator();
 		while (iter.hasNext()) {
 			ISimpleLaunchVariable variable = (ISimpleLaunchVariable) iter.next();
 			if (variable.isContributed()) {
 				contributedVariablesToRemove.append('\t').append(variable.getName()).append('\n');
 			}
 		}
 		if (contributedVariablesToRemove.length() > 0) {
 			boolean remove= MessageDialog.openQuestion(getShell(), DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.21"), MessageFormat.format(DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.22"), new String[] {contributedVariablesToRemove.toString()})); //$NON-NLS-1$ //$NON-NLS-2$
 			if (!remove) {
 				return;
 			}
 		}
 		ISimpleLaunchVariable[] variables= (ISimpleLaunchVariable[]) variablesToRemove.toArray(new ISimpleLaunchVariable[0]);
 		variableContentProvider.removeVariables(variables);
 		variableTable.refresh();
 	}

 	/**
 	 * Responds to a selection changed event in the variable table
 	 * @param event the selection change event
 	 */
 	protected void handleTableSelectionChanged(SelectionChangedEvent event) {
 		int size = ((IStructuredSelection)event.getSelection()).size();
 		envEditButton.setEnabled(size == 1);
 		envRemoveButton.setEnabled(size > 0);
 	}

 	public void init(IWorkbench workbench) {
 	}

 	/**
 	 * Revert to the previously saved state.
 	 */
 	public boolean performCancel() {
 		variableContentProvider.discardChanges();
 		return super.performCancel();
 	}

 	/**
 	 * Clear the variables.
 	 */
 	protected void performDefaults() {
 		variableContentProvider.discardChanges();
 		variableTable.refresh();
 		super.performDefaults();
 	}

 	/**
 	 * Sets the saved state for reversion.
 	 */
 	public boolean performOk() {
 		variableContentProvider.saveChanges();
 		return super.performOk();
 	}

 	/**
 	 * Returns the DebugPlugin's singleton instance of the
 	 * launch variable manager
 	 * @return the singleton instance of the simple variable registry.
 	 */
 	private ILaunchVariableManager getVariableManager() {
 		return DebugPlugin.getDefault().getLaunchVariableManager();
 	}

 	private class SimpleVariableContentProvider implements IStructuredContentProvider {
 		/**
 		 * The content provider stores a copy of the variables for use during editing.
 		 * The edited variables are saved to the launch manager when saveChanges()
 		 * is called.
 		 */
 		private List editedVariables= new ArrayList();
 		private ILaunchVariableManager variableManager;

 		public Object[] getElements(Object inputElement) {
 			return editedVariables.toArray();
 		}
 		public void dispose() {
 		}
 		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 			if (newInput == null || !(newInput instanceof ILaunchVariableManager)){
 				return;
 			}
 			variableManager= (ILaunchVariableManager) newInput;
 			discardChanges();
 			if (viewer instanceof TableViewer){
 				((TableViewer)viewer).setSorter(new ViewerSorter() {
 					public int compare(Viewer iViewer, Object e1, Object e2) {
 						if (e1 == null) {
 							return -1;
 						} else if (e2 == null) {
 							return 1;
 						} else {
 							return ((ISimpleLaunchVariable)e1).getName().compareToIgnoreCase(((ISimpleLaunchVariable)e2).getName());
 						}
 					}
 				});
 			}
 		}
 		public void addVariable(ISimpleLaunchVariable variable) {
 			editedVariables.add(variable);
 		}
 		public void removeVariables(ISimpleLaunchVariable[] variables) {
 			for (int i= 0; i < variables.length; i++) {
 				removeVariable(variables[i]);
 			}
 		}
 		public void removeVariable(ISimpleLaunchVariable variable) {
 			editedVariables.remove(variable);
 		}
 		public List getEditedVariables() {
 			return editedVariables;
 		}
 		/**
 		 * Discards the edited variable state and restores the variables from the
 		 * variable manager.
 		 */
 		public void discardChanges() {
 			if (variableManager == null) {
 				return;
 			}
 			editedVariables.clear();
 			ISimpleLaunchVariable[] simpleVariables= variableManager.getSimpleVariables();
 			for (int i = 0; i < simpleVariables.length; i++) {
 				ISimpleLaunchVariable variable= simpleVariables[i];
 				editedVariables.add(variableManager.newSimpleVariable(variable.getName(), variable.getValue(), variable.getDescription(), variable.isContributed()));
 			}
 		}
 		/**
 		 * Saves the edited variable state to the variable manager.
 		 */
 		public void saveChanges() {
 			if (variableManager == null) {
 				return;
 			}
 			variableManager.removeSimpleVariables(variableManager.getSimpleVariables());
 			variableManager.addSimpleVariables((ISimpleLaunchVariable[]) editedVariables.toArray(new ISimpleLaunchVariable[0]));
 		}
 	}

 	private class SimpleVariableLabelProvider extends LabelProvider implements ITableLabelProvider, IColorProvider {
 		public Image getColumnImage(Object element, int columnIndex) {
 			return null;
 		}
 		public String getColumnText(Object element, int columnIndex) {
 			if (element instanceof ISimpleLaunchVariable) {
 				ISimpleLaunchVariable variable= (ISimpleLaunchVariable) element;
 				switch (columnIndex) {
 					case 0 :
 						StringBuffer buffer= new StringBuffer(variable.getName());
 						if (variable.isContributed()) {
 							buffer.append(DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.23")); //$NON-NLS-1$
 						}
 						return buffer.toString();
 					case 1:
 						String value= variable.getValue();
 						if (value == null) {
 							value= ""; //$NON-NLS-1$
 						}
 						return value;
 					case 2:
 						String description= variable.getDescription();
 						if (description == null) {
 							description= ""; //$NON-NLS-1$
 						}
 						return description;
 				}
 			}
 			return null;
 		}
 		public Color getForeground(Object element) {
 			return null;
 		}
 		public Color getBackground(Object element) {
 			if (element instanceof ISimpleLaunchVariable) {
 				if (((ISimpleLaunchVariable) element).isContributed()) {
 					Display display= Display.getCurrent();
 					return display.getSystemColor(SWT.COLOR_INFO_BACKGROUND);
 				}
 			}
 			return null;
 		}
 	}
 }
	/*******************************************************************************
	* 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.debug.internal.ui.preferences;

	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;

	import org.eclipse.debug.core.DebugPlugin;
	import org.eclipse.debug.core.variables.ILaunchVariableManager;
	import org.eclipse.debug.core.variables.ISimpleLaunchVariable;
	import org.eclipse.debug.internal.ui.IDebugHelpContextIds;
	import org.eclipse.debug.internal.ui.SWTUtil;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.preference.PreferencePage;
	import org.eclipse.jface.viewers.ColumnLayoutData;
	import org.eclipse.jface.viewers.ColumnWeightData;
	import org.eclipse.jface.viewers.DoubleClickEvent;
	import org.eclipse.jface.viewers.IColorProvider;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITableLabelProvider;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.TableLayout;
	import org.eclipse.jface.viewers.TableViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerSorter;
	import org.eclipse.jface.window.Window;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.KeyAdapter;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.graphics.Image;
	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.Control;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.TableColumn;
	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;
	import org.eclipse.ui.help.WorkbenchHelp;

	/**
	* Preference page for creating and configuring simple
	* launch variables.
	*
	* @see org.eclipse.debug.core.variables.ISimpleLaunchVariable
	* @see org.eclipse.debug.core.variables.ISimpleVariableRegistry
	*/
	public class SimpleLaunchVariablePreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

	private TableViewer variableTable;
	protected Button envAddButton;
	protected Button envEditButton;
	protected Button envRemoveButton;

	protected SimpleVariableContentProvider variableContentProvider= new SimpleVariableContentProvider();

	protected static final String NAME_LABEL= DebugPreferencesMessages.getString("SimpleVariablePreferencePage.10"); //$NON-NLS-1$
	protected static final String VALUE_LABEL = DebugPreferencesMessages.getString("SimpleVariablePreferencePage.11"); //$NON-NLS-1$
	protected static final String DESCRIPTION_LABEL = DebugPreferencesMessages.getString("SimpleVariablePreferencePage.12"); //$NON-NLS-1$

	protected static String[] variableTableColumnProperties= {
	"variable", //$NON-NLS-1$
	"value", //$NON-NLS-1$
	"description" //$NON-NLS-1$
	};
	protected String[] variableTableColumnHeaders= {
	DebugPreferencesMessages.getString("SimpleVariablePreferencePage.3"), //$NON-NLS-1$
	DebugPreferencesMessages.getString("SimpleVariablePreferencePage.4"), //$NON-NLS-1$
	DebugPreferencesMessages.getString("SimpleVariablePreferencePage.5") //$NON-NLS-1$
	};
	protected ColumnLayoutData[] variableTableColumnLayouts= {
	new ColumnWeightData(33),
	new ColumnWeightData(33),
	new ColumnWeightData(34)
	};

	public SimpleLaunchVariablePreferencePage() {
	setDescription(DebugPreferencesMessages.getString("SimpleVariablePreferencePage.6")); //$NON-NLS-1$
	}

	/**
	* @see PreferencePage#createControl(Composite)
	*/
	public void createControl(Composite parent) {
	super.createControl(parent);
	WorkbenchHelp.setHelp(getControl(), IDebugHelpContextIds.SIMPLE_VARIABLE_PREFERENCE_PAGE);
	}

	protected Control createContents(Composite parent) {
	noDefaultAndApplyButton();
	Font font= parent.getFont();
	//The main composite
	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.marginHeight=0;
	layout.marginWidth=0;
	layout.numColumns= 2;
	composite.setLayout(layout);
	composite.setFont(font);

	createTable(composite);
	createButtons(composite);
	return composite;
	}

	/**
	* Creates and configures the table containing launch configuration variables
	* and their associated value.
	*/
	private void createTable(Composite parent) {
	Font font= parent.getFont();
	// Create table composite
	Composite tableComposite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	layout.numColumns = 1;
	GridData gridData = new GridData(GridData.FILL_BOTH);
	gridData.heightHint = 150;
	gridData.widthHint = 400;
	tableComposite.setLayout(layout);
	tableComposite.setLayoutData(gridData);
	tableComposite.setFont(font);
	// Create table
	variableTable = new TableViewer(tableComposite, SWT.BORDER \| SWT.H_SCROLL \| SWT.V_SCROLL \| SWT.MULTI \| SWT.FULL_SELECTION);
	Table table = variableTable.getTable();
	TableLayout tableLayout = new TableLayout();
	table.setLayout(tableLayout);
	table.setHeaderVisible(true);
	table.setFont(font);
	gridData = new GridData(GridData.FILL_BOTH);
	variableTable.getControl().setLayoutData(gridData);
	variableTable.setContentProvider(variableContentProvider);
	variableTable.setColumnProperties(variableTableColumnProperties);
	variableTable.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	handleTableSelectionChanged(event);
	}
	});

	variableTable.addDoubleClickListener(new IDoubleClickListener() {
	public void doubleClick(DoubleClickEvent event) {
	handleEditButtonPressed();
	}
	});
	variableTable.getTable().addKeyListener(new KeyAdapter() {
	public void keyPressed(KeyEvent event) {
	if (event.character == SWT.DEL && event.stateMask == 0) {
	handleRemoveButtonPressed();
	}
	}
	});

	// Create columns
	for (int i = 0; i < variableTableColumnHeaders.length; i++) {
	tableLayout.addColumnData(variableTableColumnLayouts[i]);
	TableColumn tc = new TableColumn(table, SWT.NONE, i);
	tc.setResizable(variableTableColumnLayouts[i].resizable);
	tc.setText(variableTableColumnHeaders[i]);
	}
	variableTable.setInput(getVariableManager());
	variableTable.setLabelProvider(new SimpleVariableLabelProvider());
	}

	/**
	* Creates the new/edit/remove buttons for the variable table
	* @param parent the composite in which the buttons should be created
	*/
	private void createButtons(Composite parent) {
	// Create button composite
	Composite buttonComposite = new Composite(parent, SWT.NONE);
	GridLayout glayout = new GridLayout();
	glayout.marginHeight = 0;
	glayout.marginWidth = 0;
	glayout.numColumns = 1;
	GridData gdata = new GridData(GridData.VERTICAL_ALIGN_BEGINNING \| GridData.HORIZONTAL_ALIGN_END);
	buttonComposite.setLayout(glayout);
	buttonComposite.setLayoutData(gdata);
	buttonComposite.setFont(parent.getFont());

	// Create a little vertical space
	Label label= new Label(buttonComposite, SWT.NONE);
	GridData gd= new GridData();
	gd.horizontalSpan= 1;
	label.setLayoutData(gd);
	// Create buttons
	envAddButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.7"), null); //$NON-NLS-1$
	envAddButton.addSelectionListener(new SelectionAdapter()
	{
	public void widgetSelected(SelectionEvent event) {
	handleAddButtonPressed();
	}
	});
	envEditButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.8"), null); //$NON-NLS-1$
	envEditButton.addSelectionListener(new SelectionAdapter()
	{
	public void widgetSelected(SelectionEvent event) {
	handleEditButtonPressed();
	}
	});
	envEditButton.setEnabled(false);
	envRemoveButton = SWTUtil.createPushButton(buttonComposite, DebugPreferencesMessages.getString("SimpleVariablePreferencePage.9"), null); //$NON-NLS-1$
	envRemoveButton.addSelectionListener(new SelectionAdapter()
	{
	public void widgetSelected(SelectionEvent event) {
	handleRemoveButtonPressed();
	}
	});
	envRemoveButton.setEnabled(false);
	}

	private void handleAddButtonPressed() {
	MultipleInputDialog dialog= new MultipleInputDialog(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.13"), new String[] {NAME_LABEL, VALUE_LABEL, DESCRIPTION_LABEL}, null); //$NON-NLS-1$
	dialog.disallowEmpty(NAME_LABEL);
	if (dialog.open() != Window.OK) {
	return;
	}
	String name= dialog.getValue(NAME_LABEL).trim();
	if (name != null && name.length() > 0) {
	String value= dialog.getValue(VALUE_LABEL);
	String description= dialog.getValue(DESCRIPTION_LABEL);
	ISimpleLaunchVariable variable= DebugPlugin.getDefault().getLaunchVariableManager().newSimpleVariable(name, value, description, false);
	addVariable(variable);
	}
	}

	/**
	* Attempts to add the given variable. Returns whether the variable
	* was added or not (as when the user answers not to overwrite an
	* existing variable).
	* @param variable the variable to add
	* @return whether the variable was added
	*/
	public boolean addVariable(ISimpleLaunchVariable variable) {
	String name= variable.getName();
	List editedVariables= variableContentProvider.getEditedVariables();
	Iterator iter= editedVariables.iterator();
	while (iter.hasNext()) {
	ISimpleLaunchVariable currentVariable = (ISimpleLaunchVariable) iter.next();
	String variableName = currentVariable.getName();
	if (variableName.equals(name)) {
	boolean overWrite= MessageDialog.openQuestion(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.15"), MessageFormat.format(DebugPreferencesMessages.getString("SimpleVariablePreferencePage.16"), new String[] {name})); //$NON-NLS-1$ //$NON-NLS-2$
	if (!overWrite) {
	return false;
	}
	variableContentProvider.removeVariable(currentVariable);
	break;
	}
	}
	variableContentProvider.addVariable(variable);
	variableTable.refresh();
	return true;
	}

	private void handleEditButtonPressed() {
	IStructuredSelection selection= (IStructuredSelection) variableTable.getSelection();
	ISimpleLaunchVariable variable= (ISimpleLaunchVariable) selection.getFirstElement();
	if (variable == null) {
	return;
	}
	String value= variable.getValue();
	if (value == null) {
	value= ""; //$NON-NLS-1$
	}
	String description= variable.getDescription();
	if (description == null) {
	description= ""; //$NON-NLS-1$
	}
	String originalName= variable.getName();
	MultipleInputDialog dialog= new MultipleInputDialog(getShell(), DebugPreferencesMessages.getString("SimpleVariablePreferencePage.14"), new String[] {NAME_LABEL, VALUE_LABEL, DESCRIPTION_LABEL}, new String[] {originalName, value, description}); //$NON-NLS-1$
	if (dialog.open() == Window.OK) {
	String name= dialog.getValue(NAME_LABEL);
	value= dialog.getValue(VALUE_LABEL);
	description= dialog.getValue(DESCRIPTION_LABEL);
	if (!name.equals(originalName)) {
	if (addVariable(DebugPlugin.getDefault().getLaunchVariableManager().newSimpleVariable(name, value, description, false))) {
	variableContentProvider.removeVariable(variable);
	variableTable.refresh();
	}
	} else {
	if (value != null) {
	variable.setValue(value);
	}
	if (description != null) {
	variable.setDescription(description);
	}
	variableTable.update(variable, null);
	}
	}
	}

	/**
	* Remove the selection variables.
	*/
	private void handleRemoveButtonPressed() {
	IStructuredSelection selection= (IStructuredSelection) variableTable.getSelection();
	List variablesToRemove= selection.toList();
	StringBuffer contributedVariablesToRemove= new StringBuffer();
	Iterator iter= variablesToRemove.iterator();
	while (iter.hasNext()) {
	ISimpleLaunchVariable variable = (ISimpleLaunchVariable) iter.next();
	if (variable.isContributed()) {
	contributedVariablesToRemove.append('\t').append(variable.getName()).append('\n');
	}
	}
	if (contributedVariablesToRemove.length() > 0) {
	boolean remove= MessageDialog.openQuestion(getShell(), DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.21"), MessageFormat.format(DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.22"), new String[] {contributedVariablesToRemove.toString()})); //$NON-NLS-1$ //$NON-NLS-2$
	if (!remove) {
	return;
	}
	}
	ISimpleLaunchVariable[] variables= (ISimpleLaunchVariable[]) variablesToRemove.toArray(new ISimpleLaunchVariable[0]);
	variableContentProvider.removeVariables(variables);
	variableTable.refresh();
	}

	/**
	* Responds to a selection changed event in the variable table
	* @param event the selection change event
	*/
	protected void handleTableSelectionChanged(SelectionChangedEvent event) {
	int size = ((IStructuredSelection)event.getSelection()).size();
	envEditButton.setEnabled(size == 1);
	envRemoveButton.setEnabled(size > 0);
	}

	public void init(IWorkbench workbench) {
	}

	/**
	* Revert to the previously saved state.
	*/
	public boolean performCancel() {
	variableContentProvider.discardChanges();
	return super.performCancel();
	}

	/**
	* Clear the variables.
	*/
	protected void performDefaults() {
	variableContentProvider.discardChanges();
	variableTable.refresh();
	super.performDefaults();
	}

	/**
	* Sets the saved state for reversion.
	*/
	public boolean performOk() {
	variableContentProvider.saveChanges();
	return super.performOk();
	}

	/**
	* Returns the DebugPlugin's singleton instance of the
	* launch variable manager
	* @return the singleton instance of the simple variable registry.
	*/
	private ILaunchVariableManager getVariableManager() {
	return DebugPlugin.getDefault().getLaunchVariableManager();
	}

	private class SimpleVariableContentProvider implements IStructuredContentProvider {
	/**
	* The content provider stores a copy of the variables for use during editing.
	* The edited variables are saved to the launch manager when saveChanges()
	* is called.
	*/
	private List editedVariables= new ArrayList();
	private ILaunchVariableManager variableManager;

	public Object[] getElements(Object inputElement) {
	return editedVariables.toArray();
	}
	public void dispose() {
	}
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	if (newInput == null \|\| !(newInput instanceof ILaunchVariableManager)){
	return;
	}
	variableManager= (ILaunchVariableManager) newInput;
	discardChanges();
	if (viewer instanceof TableViewer){
	((TableViewer)viewer).setSorter(new ViewerSorter() {
	public int compare(Viewer iViewer, Object e1, Object e2) {
	if (e1 == null) {
	return -1;
	} else if (e2 == null) {
	return 1;
	} else {
	return ((ISimpleLaunchVariable)e1).getName().compareToIgnoreCase(((ISimpleLaunchVariable)e2).getName());
	}
	}
	});
	}
	}
	public void addVariable(ISimpleLaunchVariable variable) {
	editedVariables.add(variable);
	}
	public void removeVariables(ISimpleLaunchVariable[] variables) {
	for (int i= 0; i < variables.length; i++) {
	removeVariable(variables[i]);
	}
	}
	public void removeVariable(ISimpleLaunchVariable variable) {
	editedVariables.remove(variable);
	}
	public List getEditedVariables() {
	return editedVariables;
	}
	/**
	* Discards the edited variable state and restores the variables from the
	* variable manager.
	*/
	public void discardChanges() {
	if (variableManager == null) {
	return;
	}
	editedVariables.clear();
	ISimpleLaunchVariable[] simpleVariables= variableManager.getSimpleVariables();
	for (int i = 0; i < simpleVariables.length; i++) {
	ISimpleLaunchVariable variable= simpleVariables[i];
	editedVariables.add(variableManager.newSimpleVariable(variable.getName(), variable.getValue(), variable.getDescription(), variable.isContributed()));
	}
	}
	/**
	* Saves the edited variable state to the variable manager.
	*/
	public void saveChanges() {
	if (variableManager == null) {
	return;
	}
	variableManager.removeSimpleVariables(variableManager.getSimpleVariables());
	variableManager.addSimpleVariables((ISimpleLaunchVariable[]) editedVariables.toArray(new ISimpleLaunchVariable[0]));
	}
	}

	private class SimpleVariableLabelProvider extends LabelProvider implements ITableLabelProvider, IColorProvider {
	public Image getColumnImage(Object element, int columnIndex) {
	return null;
	}
	public String getColumnText(Object element, int columnIndex) {
	if (element instanceof ISimpleLaunchVariable) {
	ISimpleLaunchVariable variable= (ISimpleLaunchVariable) element;
	switch (columnIndex) {
	case 0 :
	StringBuffer buffer= new StringBuffer(variable.getName());
	if (variable.isContributed()) {
	buffer.append(DebugPreferencesMessages.getString("SimpleLaunchVariablePreferencePage.23")); //$NON-NLS-1$
	}
	return buffer.toString();
	case 1:
	String value= variable.getValue();
	if (value == null) {
	value= ""; //$NON-NLS-1$
	}
	return value;
	case 2:
	String description= variable.getDescription();
	if (description == null) {
	description= ""; //$NON-NLS-1$
	}
	return description;
	}
	}
	return null;
	}
	public Color getForeground(Object element) {
	return null;
	}
	public Color getBackground(Object element) {
	if (element instanceof ISimpleLaunchVariable) {
	if (((ISimpleLaunchVariable) element).isContributed()) {
	Display display= Display.getCurrent();
	return display.getSystemColor(SWT.COLOR_INFO_BACKGROUND);
	}
	}
	return null;
	}
	}
	}