org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/NewVariableEntryDialog.java - jdt/eclipse.jdt.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2011 IBM Corporation and others.
  * 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:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jdt.internal.ui.wizards.buildpaths;

 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CLabel;
 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.Shell;

 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;

 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.IDialogSettings;
 import org.eclipse.jface.dialogs.StatusDialog;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.jface.window.Window;

 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.dialogs.PreferencesUtil;

 import org.eclipse.jdt.core.JavaCore;

 import org.eclipse.jdt.internal.corext.util.Messages;

 import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
 import org.eclipse.jdt.internal.ui.JavaPlugin;
 import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
 import org.eclipse.jdt.internal.ui.preferences.ClasspathVariablesPreferencePage;
 import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.IDialogFieldListener;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.IListAdapter;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.ListDialogField;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.SelectionButtonDialogField;

 public class NewVariableEntryDialog extends StatusDialog {

 	private class VariablesAdapter implements IDialogFieldListener, IListAdapter<CPVariableElement> {

 		// -------- IListAdapter --------

 		@Override
 		public void customButtonPressed(ListDialogField<CPVariableElement> field, int index) {
 			switch (index) {
 			case IDX_EXTEND: /* extend */
 				extendButtonPressed();
 				break;
 			}
 		}

 		@Override
 		public void selectionChanged(ListDialogField<CPVariableElement> field) {
 			doSelectionChanged();
 		}

 		@Override
 		public void doubleClicked(ListDialogField<CPVariableElement> field) {
 			doDoubleClick();
 		}

 		// ---------- IDialogFieldListener --------

 		@Override
 		public void dialogFieldChanged(DialogField field) {
 			if (field == fConfigButton) {
 				configButtonPressed();
 			}

 		}

 	}

 	private final int IDX_EXTEND= 0;

 	private ListDialogField<CPVariableElement> fVariablesList;
 	private boolean fCanExtend;
 	private boolean fIsValidSelection;

 	private IPath[] fResultPaths;

 	private SelectionButtonDialogField fConfigButton;

 	private CLabel fWarning;

 	public NewVariableEntryDialog(Shell parent) {
 		super(parent);
 		setTitle(NewWizardMessages.NewVariableEntryDialog_title);

 		updateStatus(new StatusInfo(IStatus.ERROR, "")); //$NON-NLS-1$

 		String[] buttonLabels= new String[] {
 			NewWizardMessages.NewVariableEntryDialog_vars_extend,
 		};

 		VariablesAdapter adapter= new VariablesAdapter();

 		CPVariableElementLabelProvider labelProvider= new CPVariableElementLabelProvider(false);

 		fVariablesList= new ListDialogField<>(adapter, buttonLabels, labelProvider);
 		fVariablesList.setDialogFieldListener(adapter);
 		fVariablesList.setLabelText(NewWizardMessages.NewVariableEntryDialog_vars_label);

 		fVariablesList.enableButton(IDX_EXTEND, false);

 		fVariablesList.setViewerComparator(new ViewerComparator() {
 			@Override
 			public int compare(Viewer viewer, Object e1, Object e2) {
 				if (e1 instanceof CPVariableElement && e2 instanceof CPVariableElement) {
 					return getComparator().compare(((CPVariableElement)e1).getName(), ((CPVariableElement)e2).getName());
 				}
 				return super.compare(viewer, e1, e2);
 			}
 		});


 		fConfigButton= new SelectionButtonDialogField(SWT.PUSH);
 		fConfigButton.setLabelText(NewWizardMessages.NewVariableEntryDialog_configbutton_label);
 		fConfigButton.setDialogFieldListener(adapter);

 		initializeElements();

 		fCanExtend= false;
 		fIsValidSelection= false;
 		fResultPaths= null;

 		fVariablesList.selectFirstElement();
 	}

 	/*
 	 * @see org.eclipse.jface.dialogs.Dialog#isResizable()
 	 * @since 3.4
 	 */
 	@Override
 	protected boolean isResizable() {
 		return true;
 	}

 	private void initializeElements() {
 		String[] entries= JavaCore.getClasspathVariableNames();
 		ArrayList<CPVariableElement> elements= new ArrayList<>(entries.length);
 		for (int i= 0; i < entries.length; i++) {
 			String name= entries[i];
 			IPath entryPath= JavaCore.getClasspathVariable(name);
 			if (entryPath != null) {
 				elements.add(new CPVariableElement(name, entryPath));
 			}
 		}

 		fVariablesList.setElements(elements);
 	}


 	@Override
 	protected void configureShell(Shell shell) {
 		super.configureShell(shell);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(shell, IJavaHelpContextIds.NEW_VARIABLE_ENTRY_DIALOG);
 	}

 	@Override
 	protected IDialogSettings getDialogBoundsSettings() {
 		return JavaPlugin.getDefault().getDialogSettingsSection(getClass().getName());
 	}

 	@Override
 	protected Control createDialogArea(Composite parent) {
 		initializeDialogUnits(parent);

 		Composite composite= (Composite) super.createDialogArea(parent);
 		GridLayout layout= (GridLayout) composite.getLayout();
 		layout.numColumns= 2;

 		fVariablesList.doFillIntoGrid(composite, 3);

 		LayoutUtil.setHorizontalSpan(fVariablesList.getLabelControl(null), 2);

 		GridData listData= (GridData) fVariablesList.getListControl(null).getLayoutData();
 		listData.grabExcessHorizontalSpace= true;
 		listData.heightHint= convertHeightInCharsToPixels(10);
 		listData.widthHint= convertWidthInCharsToPixels(70);

 		fWarning= new CLabel(composite, SWT.NONE);
 		fWarning.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false, fVariablesList.getNumberOfControls() - 1, 1));

 		Composite lowerComposite= new Composite(composite, SWT.NONE);
 		lowerComposite.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

 		layout= new GridLayout();
 		layout.marginHeight= 0;
 		layout.marginWidth= 0;
 		lowerComposite.setLayout(layout);

 		fConfigButton.doFillIntoGrid(lowerComposite, 1);

 		applyDialogFont(composite);
 		return composite;
 	}

 	public IPath[] getResult() {
 		return fResultPaths;
 	}

 	/*
  	 * @see IDoubleClickListener#doubleClick(DoubleClickEvent)
  	 */
 	private void doDoubleClick() {
 		if (fIsValidSelection) {
 			okPressed();
 		} else if (fCanExtend) {
 			extendButtonPressed();
 		}
 	}

 	private void doSelectionChanged() {
 		boolean isValidSelection= true;
 		boolean canExtend= false;
 		StatusInfo status= new StatusInfo();

 		List<CPVariableElement> selected= fVariablesList.getSelectedElements();
 		int nSelected= selected.size();

 		if (nSelected > 0) {
 			fResultPaths= new Path[nSelected];
 			for (int i= 0; i < nSelected; i++) {
 				CPVariableElement curr= selected.get(i);
 				fResultPaths[i]= new Path(curr.getName());
 				File file= curr.getPath().toFile();
 				if (!file.exists()) {
 					status.setError(NewWizardMessages.NewVariableEntryDialog_info_notexists);
 					isValidSelection= false;
 					break;
 				}
 				if (file.isDirectory()) {
 					canExtend= true;
 				}
 			}
 		} else {
 			isValidSelection= false;
 			status.setInfo(NewWizardMessages.NewVariableEntryDialog_info_noselection);
 		}
 		if (isValidSelection && nSelected > 1) {
 			String str= Messages.format(NewWizardMessages.NewVariableEntryDialog_info_selected, String.valueOf(nSelected));
 			status.setInfo(str);
 		}
 		fCanExtend= nSelected == 1 && canExtend;
 		fVariablesList.enableButton(0, fCanExtend);

 		updateStatus(status);
 		fIsValidSelection= isValidSelection;
 		Button okButton= getButton(IDialogConstants.OK_ID);
 		if (okButton != null  && !okButton.isDisposed()) {
 			okButton.setEnabled(isValidSelection);
 		}
 		updateDeprecationWarning();
 	}

 	private void updateDeprecationWarning() {
 		if (fWarning == null || fWarning.isDisposed())
 			return;

 		for (Iterator<CPVariableElement> iter= fVariablesList.getSelectedElements().iterator(); iter.hasNext();) {
 			CPVariableElement element= iter.next();
 			String deprecationMessage= element.getDeprecationMessage();
 			if (deprecationMessage != null) {
 				fWarning.setText(deprecationMessage);
 				fWarning.setImage(JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING));
 				return;
 			}
 		}
 		fWarning.setText(null);
 		fWarning.setImage(null);
 	}

 	private IPath[] chooseExtensions(CPVariableElement elem) {
 		File file= elem.getPath().toFile();

 		JARFileSelectionDialog dialog= new JARFileSelectionDialog(getShell(), true, true, true);
 		dialog.setTitle(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_title);
 		dialog.setMessage(Messages.format(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_description, elem.getName()));
 		dialog.setInput(file);
 		if (dialog.open() == Window.OK) {
 			Object[] selected= dialog.getResult();
 			IPath[] paths= new IPath[selected.length];
 			for (int i= 0; i < selected.length; i++) {
 				IPath filePath= Path.fromOSString(((File) selected[i]).getPath());
 				IPath resPath=  new Path(elem.getName());
 				for (int k= elem.getPath().segmentCount(); k < filePath.segmentCount(); k++) {
 					resPath= resPath.append(filePath.segment(k));
 				}
 				paths[i]= resPath;
 			}
 			return paths;
 		}
 		return null;
 	}

 	protected final void extendButtonPressed() {
 		List<CPVariableElement> selected= fVariablesList.getSelectedElements();
 		if (selected.size() == 1) {
 			IPath[] extendedPaths= chooseExtensions(selected.get(0));
 			if (extendedPaths != null) {
 				fResultPaths= extendedPaths;
 				super.buttonPressed(IDialogConstants.OK_ID);
 			}
 		}
 	}

 	protected final void configButtonPressed() {
 		String id= ClasspathVariablesPreferencePage.ID;
 		Map<String, String> options= new HashMap<>();
 		List<CPVariableElement> selected= fVariablesList.getSelectedElements();
 		if (!selected.isEmpty()) {
 			String varName= selected.get(0).getName();
 			options.put(ClasspathVariablesPreferencePage.DATA_SELECT_VARIABLE, varName);
 		}
 		PreferencesUtil.createPreferenceDialogOn(getShell(), id, new String[] { id }, options).open();

 		List<CPVariableElement> oldElements= fVariablesList.getElements();
 		initializeElements();
 		List<CPVariableElement> newElements= fVariablesList.getElements();
 		newElements.removeAll(oldElements);
 		if (!newElements.isEmpty()) {
 			fVariablesList.selectElements(new StructuredSelection(newElements));
 		} else if (fVariablesList.getSelectedElements().isEmpty()) {
 			fVariablesList.selectFirstElement();
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2011 IBM Corporation and others.
	* 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:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jdt.internal.ui.wizards.buildpaths;

	import java.io.File;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.CLabel;
	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.Shell;

	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Path;

	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.IDialogSettings;
	import org.eclipse.jface.dialogs.StatusDialog;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.jface.window.Window;

	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.dialogs.PreferencesUtil;

	import org.eclipse.jdt.core.JavaCore;

	import org.eclipse.jdt.internal.corext.util.Messages;

	import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
	import org.eclipse.jdt.internal.ui.JavaPlugin;
	import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
	import org.eclipse.jdt.internal.ui.preferences.ClasspathVariablesPreferencePage;
	import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.IDialogFieldListener;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.IListAdapter;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.ListDialogField;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.SelectionButtonDialogField;

	public class NewVariableEntryDialog extends StatusDialog {

	private class VariablesAdapter implements IDialogFieldListener, IListAdapter<CPVariableElement> {

	// -------- IListAdapter --------

	@Override
	public void customButtonPressed(ListDialogField<CPVariableElement> field, int index) {
	switch (index) {
	case IDX_EXTEND: /* extend */
	extendButtonPressed();
	break;
	}
	}

	@Override
	public void selectionChanged(ListDialogField<CPVariableElement> field) {
	doSelectionChanged();
	}

	@Override
	public void doubleClicked(ListDialogField<CPVariableElement> field) {
	doDoubleClick();
	}

	// ---------- IDialogFieldListener --------

	@Override
	public void dialogFieldChanged(DialogField field) {
	if (field == fConfigButton) {
	configButtonPressed();
	}

	}

	}

	private final int IDX_EXTEND= 0;

	private ListDialogField<CPVariableElement> fVariablesList;
	private boolean fCanExtend;
	private boolean fIsValidSelection;

	private IPath[] fResultPaths;

	private SelectionButtonDialogField fConfigButton;

	private CLabel fWarning;

	public NewVariableEntryDialog(Shell parent) {
	super(parent);
	setTitle(NewWizardMessages.NewVariableEntryDialog_title);

	updateStatus(new StatusInfo(IStatus.ERROR, "")); //$NON-NLS-1$

	String[] buttonLabels= new String[] {
	NewWizardMessages.NewVariableEntryDialog_vars_extend,
	};

	VariablesAdapter adapter= new VariablesAdapter();

	CPVariableElementLabelProvider labelProvider= new CPVariableElementLabelProvider(false);

	fVariablesList= new ListDialogField<>(adapter, buttonLabels, labelProvider);
	fVariablesList.setDialogFieldListener(adapter);
	fVariablesList.setLabelText(NewWizardMessages.NewVariableEntryDialog_vars_label);

	fVariablesList.enableButton(IDX_EXTEND, false);

	fVariablesList.setViewerComparator(new ViewerComparator() {
	@Override
	public int compare(Viewer viewer, Object e1, Object e2) {
	if (e1 instanceof CPVariableElement && e2 instanceof CPVariableElement) {
	return getComparator().compare(((CPVariableElement)e1).getName(), ((CPVariableElement)e2).getName());
	}
	return super.compare(viewer, e1, e2);
	}
	});


	fConfigButton= new SelectionButtonDialogField(SWT.PUSH);
	fConfigButton.setLabelText(NewWizardMessages.NewVariableEntryDialog_configbutton_label);
	fConfigButton.setDialogFieldListener(adapter);

	initializeElements();

	fCanExtend= false;
	fIsValidSelection= false;
	fResultPaths= null;

	fVariablesList.selectFirstElement();
	}

	/*
	* @see org.eclipse.jface.dialogs.Dialog#isResizable()
	* @since 3.4
	*/
	@Override
	protected boolean isResizable() {
	return true;
	}

	private void initializeElements() {
	String[] entries= JavaCore.getClasspathVariableNames();
	ArrayList<CPVariableElement> elements= new ArrayList<>(entries.length);
	for (int i= 0; i < entries.length; i++) {
	String name= entries[i];
	IPath entryPath= JavaCore.getClasspathVariable(name);
	if (entryPath != null) {
	elements.add(new CPVariableElement(name, entryPath));
	}
	}

	fVariablesList.setElements(elements);
	}


	@Override
	protected void configureShell(Shell shell) {
	super.configureShell(shell);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(shell, IJavaHelpContextIds.NEW_VARIABLE_ENTRY_DIALOG);
	}

	@Override
	protected IDialogSettings getDialogBoundsSettings() {
	return JavaPlugin.getDefault().getDialogSettingsSection(getClass().getName());
	}

	@Override
	protected Control createDialogArea(Composite parent) {
	initializeDialogUnits(parent);

	Composite composite= (Composite) super.createDialogArea(parent);
	GridLayout layout= (GridLayout) composite.getLayout();
	layout.numColumns= 2;

	fVariablesList.doFillIntoGrid(composite, 3);

	LayoutUtil.setHorizontalSpan(fVariablesList.getLabelControl(null), 2);

	GridData listData= (GridData) fVariablesList.getListControl(null).getLayoutData();
	listData.grabExcessHorizontalSpace= true;
	listData.heightHint= convertHeightInCharsToPixels(10);
	listData.widthHint= convertWidthInCharsToPixels(70);

	fWarning= new CLabel(composite, SWT.NONE);
	fWarning.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false, fVariablesList.getNumberOfControls() - 1, 1));

	Composite lowerComposite= new Composite(composite, SWT.NONE);
	lowerComposite.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

	layout= new GridLayout();
	layout.marginHeight= 0;
	layout.marginWidth= 0;
	lowerComposite.setLayout(layout);

	fConfigButton.doFillIntoGrid(lowerComposite, 1);

	applyDialogFont(composite);
	return composite;
	}

	public IPath[] getResult() {
	return fResultPaths;
	}

	/*
	* @see IDoubleClickListener#doubleClick(DoubleClickEvent)
	*/
	private void doDoubleClick() {
	if (fIsValidSelection) {
	okPressed();
	} else if (fCanExtend) {
	extendButtonPressed();
	}
	}

	private void doSelectionChanged() {
	boolean isValidSelection= true;
	boolean canExtend= false;
	StatusInfo status= new StatusInfo();

	List<CPVariableElement> selected= fVariablesList.getSelectedElements();
	int nSelected= selected.size();

	if (nSelected > 0) {
	fResultPaths= new Path[nSelected];
	for (int i= 0; i < nSelected; i++) {
	CPVariableElement curr= selected.get(i);
	fResultPaths[i]= new Path(curr.getName());
	File file= curr.getPath().toFile();
	if (!file.exists()) {
	status.setError(NewWizardMessages.NewVariableEntryDialog_info_notexists);
	isValidSelection= false;
	break;
	}
	if (file.isDirectory()) {
	canExtend= true;
	}
	}
	} else {
	isValidSelection= false;
	status.setInfo(NewWizardMessages.NewVariableEntryDialog_info_noselection);
	}
	if (isValidSelection && nSelected > 1) {
	String str= Messages.format(NewWizardMessages.NewVariableEntryDialog_info_selected, String.valueOf(nSelected));
	status.setInfo(str);
	}
	fCanExtend= nSelected == 1 && canExtend;
	fVariablesList.enableButton(0, fCanExtend);

	updateStatus(status);
	fIsValidSelection= isValidSelection;
	Button okButton= getButton(IDialogConstants.OK_ID);
	if (okButton != null && !okButton.isDisposed()) {
	okButton.setEnabled(isValidSelection);
	}
	updateDeprecationWarning();
	}

	private void updateDeprecationWarning() {
	if (fWarning == null \|\| fWarning.isDisposed())
	return;

	for (Iterator<CPVariableElement> iter= fVariablesList.getSelectedElements().iterator(); iter.hasNext();) {
	CPVariableElement element= iter.next();
	String deprecationMessage= element.getDeprecationMessage();
	if (deprecationMessage != null) {
	fWarning.setText(deprecationMessage);
	fWarning.setImage(JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING));
	return;
	}
	}
	fWarning.setText(null);
	fWarning.setImage(null);
	}

	private IPath[] chooseExtensions(CPVariableElement elem) {
	File file= elem.getPath().toFile();

	JARFileSelectionDialog dialog= new JARFileSelectionDialog(getShell(), true, true, true);
	dialog.setTitle(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_title);
	dialog.setMessage(Messages.format(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_description, elem.getName()));
	dialog.setInput(file);
	if (dialog.open() == Window.OK) {
	Object[] selected= dialog.getResult();
	IPath[] paths= new IPath[selected.length];
	for (int i= 0; i < selected.length; i++) {
	IPath filePath= Path.fromOSString(((File) selected[i]).getPath());
	IPath resPath= new Path(elem.getName());
	for (int k= elem.getPath().segmentCount(); k < filePath.segmentCount(); k++) {
	resPath= resPath.append(filePath.segment(k));
	}
	paths[i]= resPath;
	}
	return paths;
	}
	return null;
	}

	protected final void extendButtonPressed() {
	List<CPVariableElement> selected= fVariablesList.getSelectedElements();
	if (selected.size() == 1) {
	IPath[] extendedPaths= chooseExtensions(selected.get(0));
	if (extendedPaths != null) {
	fResultPaths= extendedPaths;
	super.buttonPressed(IDialogConstants.OK_ID);
	}
	}
	}

	protected final void configButtonPressed() {
	String id= ClasspathVariablesPreferencePage.ID;
	Map<String, String> options= new HashMap<>();
	List<CPVariableElement> selected= fVariablesList.getSelectedElements();
	if (!selected.isEmpty()) {
	String varName= selected.get(0).getName();
	options.put(ClasspathVariablesPreferencePage.DATA_SELECT_VARIABLE, varName);
	}
	PreferencesUtil.createPreferenceDialogOn(getShell(), id, new String[] { id }, options).open();

	List<CPVariableElement> oldElements= fVariablesList.getElements();
	initializeElements();
	List<CPVariableElement> newElements= fVariablesList.getElements();
	newElements.removeAll(oldElements);
	if (!newElements.isEmpty()) {
	fVariablesList.selectElements(new StructuredSelection(newElements));
	} else if (fVariablesList.getSelectedElements().isEmpty()) {
	fVariablesList.selectFirstElement();
	}
	}

	}