core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/filters/CustomFiltersDialog.java - dltk/org.eclipse.dltk.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2018 IBM Corporation and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  *******************************************************************************/
 package org.eclipse.dltk.internal.ui.filters;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 import java.util.Stack;
 import java.util.StringTokenizer;

 import org.eclipse.core.runtime.Assert;
 import org.eclipse.dltk.internal.ui.util.SWTUtil;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.viewers.ArrayContentProvider;
 import org.eclipse.jface.viewers.CheckboxTableViewer;
 import org.eclipse.jface.viewers.ILabelProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 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.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.dialogs.SelectionDialog;

 public class CustomFiltersDialog extends SelectionDialog {

 	private static final String SEPARATOR = ","; //$NON-NLS-1$

 	private String fViewId;
 	private boolean fEnablePatterns;
 	private String[] fPatterns;
 	private String[] fEnabledFilterIds;

 	private FilterDescriptor[] fBuiltInFilters;

 	private CheckboxTableViewer fCheckBoxList;
 	private Button fEnableUserDefinedPatterns;
 	private Text fUserDefinedPatterns;

 	private Stack fFilterDescriptorChangeHistory;

 	/**
 	 * Creates a dialog to customize script element filters.
 	 *
 	 * @param shell
 	 *                             the parent shell
 	 * @param viewId
 	 *                             the id of the view
 	 * @param enablePatterns
 	 *                             <code>true</code> if pattern filters are
 	 *                             enabled
 	 * @param patterns
 	 *                             the filter patterns
 	 * @param enabledFilterIds
 	 *                             the Ids of the enabled filters
 	 */
 	public CustomFiltersDialog(Shell shell, String viewId,
 			boolean enablePatterns, String[] patterns,
 			String[] enabledFilterIds) {

 		super(shell);
 		Assert.isNotNull(viewId);
 		Assert.isNotNull(patterns);
 		Assert.isNotNull(enabledFilterIds);

 		fViewId = viewId;
 		fPatterns = patterns;
 		fEnablePatterns = enablePatterns;
 		fEnabledFilterIds = enabledFilterIds;

 		fBuiltInFilters = FilterDescriptor.getFilterDescriptors(fViewId);
 		fFilterDescriptorChangeHistory = new Stack();
 		setShellStyle(getShellStyle() | SWT.RESIZE);
 	}

 	@Override
 	protected void configureShell(Shell shell) {
 		setTitle(FilterMessages.CustomFiltersDialog_title);
 		setMessage(FilterMessages.CustomFiltersDialog_filterList_label);
 		super.configureShell(shell);
 		// TODO: help system
 		// PlatformUI.getWorkbench().getHelpSystem().setHelp(shell,
 		// IDLTKHelpContextIds.CUSTOM_FILTERS_DIALOG);
 	}

 	/**
 	 * Overrides method in Dialog
 	 *
 	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(Composite)
 	 */
 	@Override
 	protected Control createDialogArea(Composite parent) {
 		initializeDialogUnits(parent);
 		// create a composite with standard margins and spacing
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.marginHeight = convertVerticalDLUsToPixels(
 				IDialogConstants.VERTICAL_MARGIN);
 		layout.marginWidth = convertHorizontalDLUsToPixels(
 				IDialogConstants.HORIZONTAL_MARGIN);
 		layout.verticalSpacing = convertVerticalDLUsToPixels(
 				IDialogConstants.VERTICAL_SPACING);
 		layout.horizontalSpacing = convertHorizontalDLUsToPixels(
 				IDialogConstants.HORIZONTAL_SPACING);
 		composite.setLayout(layout);
 		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
 		composite.setFont(parent.getFont());
 		Composite group = composite;

 		// Checkbox
 		fEnableUserDefinedPatterns = new Button(group, SWT.CHECK);
 		fEnableUserDefinedPatterns.setFocus();
 		fEnableUserDefinedPatterns.setText(
 				FilterMessages.CustomFiltersDialog_enableUserDefinedPattern);

 		// Pattern field
 		fUserDefinedPatterns = new Text(group, SWT.SINGLE | SWT.BORDER);
 		GridData data = new GridData(
 				GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
 		data.widthHint = convertWidthInCharsToPixels(59);
 		fUserDefinedPatterns.setLayoutData(data);
 		String patterns = convertToString(fPatterns, SEPARATOR);
 		fUserDefinedPatterns.setText(patterns);

 		// Info text
 		final Label info = new Label(group, SWT.LEFT);
 		info.setText(FilterMessages.CustomFiltersDialog_patternInfo);

 		// Enabling / disabling of pattern group
 		fEnableUserDefinedPatterns.setSelection(fEnablePatterns);
 		fUserDefinedPatterns.setEnabled(fEnablePatterns);
 		info.setEnabled(fEnablePatterns);
 		fEnableUserDefinedPatterns.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				boolean state = fEnableUserDefinedPatterns.getSelection();
 				fUserDefinedPatterns.setEnabled(state);
 				info.setEnabled(fEnableUserDefinedPatterns.getSelection());
 				if (state)
 					fUserDefinedPatterns.setFocus();
 			}
 		});

 		// Filters provided by extension point
 		if (fBuiltInFilters.length > 0)
 			createCheckBoxList(group);

 		applyDialogFont(parent);
 		return parent;
 	}

 	private void createCheckBoxList(Composite parent) {
 		// Filler
 		new Label(parent, SWT.NONE);

 		Label info = new Label(parent, SWT.LEFT);
 		info.setText(FilterMessages.CustomFiltersDialog_filterList_label);

 		fCheckBoxList = CheckboxTableViewer.newCheckList(parent, SWT.BORDER);
 		GridData data = new GridData(GridData.FILL_BOTH);
 		data.heightHint = fCheckBoxList.getTable().getItemHeight() * 10;
 		fCheckBoxList.getTable().setLayoutData(data);

 		fCheckBoxList.setLabelProvider(createLabelPrivder());
 		fCheckBoxList.setContentProvider(new ArrayContentProvider());
 		Arrays.sort(fBuiltInFilters);
 		fCheckBoxList.setInput(fBuiltInFilters);
 		setInitialSelections(getEnabledFilterDescriptors());

 		List initialSelection = getInitialElementSelections();
 		if (initialSelection != null && !initialSelection.isEmpty())
 			checkInitialSelections();

 		// Description
 		info = new Label(parent, SWT.LEFT);
 		info.setText(FilterMessages.CustomFiltersDialog_description_label);
 		final Text description = new Text(parent, SWT.LEFT | SWT.WRAP
 				| SWT.MULTI | SWT.READ_ONLY | SWT.BORDER | SWT.V_SCROLL);
 		data = new GridData(GridData.FILL_HORIZONTAL);
 		data.heightHint = convertHeightInCharsToPixels(3);
 		description.setLayoutData(data);
 		fCheckBoxList.addSelectionChangedListener(event -> {
 			IStructuredSelection selection = event.getStructuredSelection();
 			Object selectedElement = selection.getFirstElement();
 			if (selectedElement instanceof FilterDescriptor)
 				description.setText(
 						((FilterDescriptor) selectedElement).getDescription());
 		});
 		fCheckBoxList.addCheckStateListener(event -> {
 			Object element = event.getElement();
 			if (element instanceof FilterDescriptor) {
 				// renew if already touched
 				if (fFilterDescriptorChangeHistory.contains(element))
 					fFilterDescriptorChangeHistory.remove(element);
 				fFilterDescriptorChangeHistory.push(element);
 			}
 		});

 		addSelectionButtons(parent);
 	}

 	private void addSelectionButtons(Composite composite) {
 		Composite buttonComposite = new Composite(composite, SWT.RIGHT);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		buttonComposite.setLayout(layout);
 		GridData data = new GridData(
 				GridData.HORIZONTAL_ALIGN_END | GridData.GRAB_HORIZONTAL);
 		data.grabExcessHorizontalSpace = true;
 		composite.setData(data);

 		// Select All button
 		String label = FilterMessages.CustomFiltersDialog_SelectAllButton_label;
 		Button selectButton = createButton(buttonComposite,
 				IDialogConstants.SELECT_ALL_ID, label, false);
 		SWTUtil.setButtonDimensionHint(selectButton);
 		SelectionListener listener = new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				fCheckBoxList.setAllChecked(true);
 				fFilterDescriptorChangeHistory.clear();
 				for (int i = 0; i < fBuiltInFilters.length; i++)
 					fFilterDescriptorChangeHistory.push(fBuiltInFilters[i]);
 			}
 		};
 		selectButton.addSelectionListener(listener);

 		// De-select All button
 		label = FilterMessages.CustomFiltersDialog_DeselectAllButton_label;
 		Button deselectButton = createButton(buttonComposite,
 				IDialogConstants.DESELECT_ALL_ID, label, false);
 		SWTUtil.setButtonDimensionHint(deselectButton);
 		listener = new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				fCheckBoxList.setAllChecked(false);
 				fFilterDescriptorChangeHistory.clear();
 				for (int i = 0; i < fBuiltInFilters.length; i++)
 					fFilterDescriptorChangeHistory.push(fBuiltInFilters[i]);
 			}
 		};
 		deselectButton.addSelectionListener(listener);
 	}

 	private void checkInitialSelections() {
 		Iterator itemsToCheck = getInitialElementSelections().iterator();
 		while (itemsToCheck.hasNext())
 			fCheckBoxList.setChecked(itemsToCheck.next(), true);
 	}

 	@Override
 	protected void okPressed() {
 		if (fBuiltInFilters != null) {
 			ArrayList result = new ArrayList();
 			for (int i = 0; i < fBuiltInFilters.length; ++i) {
 				if (fCheckBoxList.getChecked(fBuiltInFilters[i]))
 					result.add(fBuiltInFilters[i]);
 			}
 			setResult(result);
 		}
 		super.okPressed();
 	}

 	private ILabelProvider createLabelPrivder() {
 		return new LabelProvider() {
 			@Override
 			public Image getImage(Object element) {
 				return null;
 			}

 			@Override
 			public String getText(Object element) {
 				if (element instanceof FilterDescriptor) {
 					return ((FilterDescriptor) element).getName();
 				}
 				return null;
 			}
 		};
 	}

 	// ---------- result handling ----------

 	@Override
 	protected void setResult(List newResult) {
 		super.setResult(newResult);
 		if (fUserDefinedPatterns.getText().length() > 0) {
 			fEnablePatterns = fEnableUserDefinedPatterns.getSelection();
 			fPatterns = convertFromString(fUserDefinedPatterns.getText(),
 					SEPARATOR);
 		} else {
 			fEnablePatterns = false;
 			fPatterns = new String[0];
 		}
 	}

 	/**
 	 * @return the patterns which have been entered by the user
 	 */
 	public String[] getUserDefinedPatterns() {
 		return fPatterns;
 	}

 	/**
 	 * @return the Ids of the enabled built-in filters
 	 */
 	public String[] getEnabledFilterIds() {
 		Object[] result = getResult();
 		Set<String> enabledIds = new HashSet<>(result.length);
 		for (int i = 0; i < result.length; i++)
 			enabledIds.add(((FilterDescriptor) result[i]).getId());
 		return enabledIds.toArray(new String[enabledIds.size()]);
 	}

 	/**
 	 * @return <code>true</code> if the user-defined patterns are disabled
 	 */
 	public boolean areUserDefinedPatternsEnabled() {
 		return fEnablePatterns;
 	}

 	/**
 	 * @return a stack with the filter descriptor check history
 	 *
 	 */
 	public Stack getFilterDescriptorChangeHistory() {
 		return fFilterDescriptorChangeHistory;
 	}

 	private FilterDescriptor[] getEnabledFilterDescriptors() {
 		FilterDescriptor[] filterDescs = fBuiltInFilters;
 		List<FilterDescriptor> result = new ArrayList<>(filterDescs.length);
 		List<String> enabledFilterIds = Arrays.asList(fEnabledFilterIds);
 		for (int i = 0; i < filterDescs.length; i++) {
 			String id = filterDescs[i].getId();
 			if (enabledFilterIds.contains(id))
 				result.add(filterDescs[i]);
 		}
 		return result.toArray(new FilterDescriptor[result.size()]);
 	}

 	public static String[] convertFromString(String patterns,
 			String separator) {
 		StringTokenizer tokenizer = new StringTokenizer(patterns, separator,
 				true);
 		int tokenCount = tokenizer.countTokens();
 		List<String> result = new ArrayList<>(tokenCount);
 		boolean escape = false;
 		boolean append = false;
 		while (tokenizer.hasMoreTokens()) {
 			String token = tokenizer.nextToken().trim();
 			if (separator.equals(token)) {
 				if (!escape)
 					escape = true;
 				else {
 					addPattern(result, separator);
 					append = true;
 				}
 			} else {
 				if (!append)
 					result.add(token);
 				else
 					addPattern(result, token);
 				append = false;
 				escape = false;
 			}
 		}
 		return result.toArray(new String[result.size()]);
 	}

 	private static void addPattern(List<String> list, String pattern) {
 		if (list.isEmpty())
 			list.add(pattern);
 		else {
 			int index = list.size() - 1;
 			list.set(index, (list.get(index)) + pattern);
 		}
 	}

 	public static String convertToString(String[] patterns, String separator) {
 		int length = patterns.length;
 		StringBuffer strBuf = new StringBuffer();
 		if (length > 0)
 			strBuf.append(escapeSeparator(patterns[0], separator));
 		else
 			return ""; //$NON-NLS-1$
 		int i = 1;
 		while (i < length) {
 			strBuf.append(separator);
 			strBuf.append(" "); //$NON-NLS-1$
 			strBuf.append(escapeSeparator(patterns[i++], separator));
 		}
 		return strBuf.toString();
 	}

 	private static String escapeSeparator(String pattern, String separator) {
 		int length = pattern.length();
 		StringBuffer buf = new StringBuffer(length);
 		for (int i = 0; i < length; i++) {
 			char ch = pattern.charAt(i);
 			if (separator.equals(String.valueOf(ch)))
 				buf.append(ch);
 			buf.append(ch);
 		}
 		return buf.toString();

 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2018 IBM Corporation and others.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v. 2.0 which is available at
	* http://www.eclipse.org/legal/epl-2.0.
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	*******************************************************************************/
	package org.eclipse.dltk.internal.ui.filters;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.HashSet;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Set;
	import java.util.Stack;
	import java.util.StringTokenizer;

	import org.eclipse.core.runtime.Assert;
	import org.eclipse.dltk.internal.ui.util.SWTUtil;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.viewers.ArrayContentProvider;
	import org.eclipse.jface.viewers.CheckboxTableViewer;
	import org.eclipse.jface.viewers.ILabelProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	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.Label;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.dialogs.SelectionDialog;

	public class CustomFiltersDialog extends SelectionDialog {

	private static final String SEPARATOR = ","; //$NON-NLS-1$

	private String fViewId;
	private boolean fEnablePatterns;
	private String[] fPatterns;
	private String[] fEnabledFilterIds;

	private FilterDescriptor[] fBuiltInFilters;

	private CheckboxTableViewer fCheckBoxList;
	private Button fEnableUserDefinedPatterns;
	private Text fUserDefinedPatterns;

	private Stack fFilterDescriptorChangeHistory;

	/**
	* Creates a dialog to customize script element filters.
	*
	* @param shell
	* the parent shell
	* @param viewId
	* the id of the view
	* @param enablePatterns
	* <code>true</code> if pattern filters are
	* enabled
	* @param patterns
	* the filter patterns
	* @param enabledFilterIds
	* the Ids of the enabled filters
	*/
	public CustomFiltersDialog(Shell shell, String viewId,
	boolean enablePatterns, String[] patterns,
	String[] enabledFilterIds) {

	super(shell);
	Assert.isNotNull(viewId);
	Assert.isNotNull(patterns);
	Assert.isNotNull(enabledFilterIds);

	fViewId = viewId;
	fPatterns = patterns;
	fEnablePatterns = enablePatterns;
	fEnabledFilterIds = enabledFilterIds;

	fBuiltInFilters = FilterDescriptor.getFilterDescriptors(fViewId);
	fFilterDescriptorChangeHistory = new Stack();
	setShellStyle(getShellStyle() \| SWT.RESIZE);
	}

	@Override
	protected void configureShell(Shell shell) {
	setTitle(FilterMessages.CustomFiltersDialog_title);
	setMessage(FilterMessages.CustomFiltersDialog_filterList_label);
	super.configureShell(shell);
	// TODO: help system
	// PlatformUI.getWorkbench().getHelpSystem().setHelp(shell,
	// IDLTKHelpContextIds.CUSTOM_FILTERS_DIALOG);
	}

	/**
	* Overrides method in Dialog
	*
	* @see org.eclipse.jface.dialogs.Dialog#createDialogArea(Composite)
	*/
	@Override
	protected Control createDialogArea(Composite parent) {
	initializeDialogUnits(parent);
	// create a composite with standard margins and spacing
	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.marginHeight = convertVerticalDLUsToPixels(
	IDialogConstants.VERTICAL_MARGIN);
	layout.marginWidth = convertHorizontalDLUsToPixels(
	IDialogConstants.HORIZONTAL_MARGIN);
	layout.verticalSpacing = convertVerticalDLUsToPixels(
	IDialogConstants.VERTICAL_SPACING);
	layout.horizontalSpacing = convertHorizontalDLUsToPixels(
	IDialogConstants.HORIZONTAL_SPACING);
	composite.setLayout(layout);
	composite.setLayoutData(new GridData(GridData.FILL_BOTH));
	composite.setFont(parent.getFont());
	Composite group = composite;

	// Checkbox
	fEnableUserDefinedPatterns = new Button(group, SWT.CHECK);
	fEnableUserDefinedPatterns.setFocus();
	fEnableUserDefinedPatterns.setText(
	FilterMessages.CustomFiltersDialog_enableUserDefinedPattern);

	// Pattern field
	fUserDefinedPatterns = new Text(group, SWT.SINGLE \| SWT.BORDER);
	GridData data = new GridData(
	GridData.HORIZONTAL_ALIGN_FILL \| GridData.GRAB_HORIZONTAL);
	data.widthHint = convertWidthInCharsToPixels(59);
	fUserDefinedPatterns.setLayoutData(data);
	String patterns = convertToString(fPatterns, SEPARATOR);
	fUserDefinedPatterns.setText(patterns);

	// Info text
	final Label info = new Label(group, SWT.LEFT);
	info.setText(FilterMessages.CustomFiltersDialog_patternInfo);

	// Enabling / disabling of pattern group
	fEnableUserDefinedPatterns.setSelection(fEnablePatterns);
	fUserDefinedPatterns.setEnabled(fEnablePatterns);
	info.setEnabled(fEnablePatterns);
	fEnableUserDefinedPatterns.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	boolean state = fEnableUserDefinedPatterns.getSelection();
	fUserDefinedPatterns.setEnabled(state);
	info.setEnabled(fEnableUserDefinedPatterns.getSelection());
	if (state)
	fUserDefinedPatterns.setFocus();
	}
	});

	// Filters provided by extension point
	if (fBuiltInFilters.length > 0)
	createCheckBoxList(group);

	applyDialogFont(parent);
	return parent;
	}

	private void createCheckBoxList(Composite parent) {
	// Filler
	new Label(parent, SWT.NONE);

	Label info = new Label(parent, SWT.LEFT);
	info.setText(FilterMessages.CustomFiltersDialog_filterList_label);

	fCheckBoxList = CheckboxTableViewer.newCheckList(parent, SWT.BORDER);
	GridData data = new GridData(GridData.FILL_BOTH);
	data.heightHint = fCheckBoxList.getTable().getItemHeight() * 10;
	fCheckBoxList.getTable().setLayoutData(data);

	fCheckBoxList.setLabelProvider(createLabelPrivder());
	fCheckBoxList.setContentProvider(new ArrayContentProvider());
	Arrays.sort(fBuiltInFilters);
	fCheckBoxList.setInput(fBuiltInFilters);
	setInitialSelections(getEnabledFilterDescriptors());

	List initialSelection = getInitialElementSelections();
	if (initialSelection != null && !initialSelection.isEmpty())
	checkInitialSelections();

	// Description
	info = new Label(parent, SWT.LEFT);
	info.setText(FilterMessages.CustomFiltersDialog_description_label);
	final Text description = new Text(parent, SWT.LEFT \| SWT.WRAP
	\| SWT.MULTI \| SWT.READ_ONLY \| SWT.BORDER \| SWT.V_SCROLL);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.heightHint = convertHeightInCharsToPixels(3);
	description.setLayoutData(data);
	fCheckBoxList.addSelectionChangedListener(event -> {
	IStructuredSelection selection = event.getStructuredSelection();
	Object selectedElement = selection.getFirstElement();
	if (selectedElement instanceof FilterDescriptor)
	description.setText(
	((FilterDescriptor) selectedElement).getDescription());
	});
	fCheckBoxList.addCheckStateListener(event -> {
	Object element = event.getElement();
	if (element instanceof FilterDescriptor) {
	// renew if already touched
	if (fFilterDescriptorChangeHistory.contains(element))
	fFilterDescriptorChangeHistory.remove(element);
	fFilterDescriptorChangeHistory.push(element);
	}
	});

	addSelectionButtons(parent);
	}

	private void addSelectionButtons(Composite composite) {
	Composite buttonComposite = new Composite(composite, SWT.RIGHT);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	buttonComposite.setLayout(layout);
	GridData data = new GridData(
	GridData.HORIZONTAL_ALIGN_END \| GridData.GRAB_HORIZONTAL);
	data.grabExcessHorizontalSpace = true;
	composite.setData(data);

	// Select All button
	String label = FilterMessages.CustomFiltersDialog_SelectAllButton_label;
	Button selectButton = createButton(buttonComposite,
	IDialogConstants.SELECT_ALL_ID, label, false);
	SWTUtil.setButtonDimensionHint(selectButton);
	SelectionListener listener = new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	fCheckBoxList.setAllChecked(true);
	fFilterDescriptorChangeHistory.clear();
	for (int i = 0; i < fBuiltInFilters.length; i++)
	fFilterDescriptorChangeHistory.push(fBuiltInFilters[i]);
	}
	};
	selectButton.addSelectionListener(listener);

	// De-select All button
	label = FilterMessages.CustomFiltersDialog_DeselectAllButton_label;
	Button deselectButton = createButton(buttonComposite,
	IDialogConstants.DESELECT_ALL_ID, label, false);
	SWTUtil.setButtonDimensionHint(deselectButton);
	listener = new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	fCheckBoxList.setAllChecked(false);
	fFilterDescriptorChangeHistory.clear();
	for (int i = 0; i < fBuiltInFilters.length; i++)
	fFilterDescriptorChangeHistory.push(fBuiltInFilters[i]);
	}
	};
	deselectButton.addSelectionListener(listener);
	}

	private void checkInitialSelections() {
	Iterator itemsToCheck = getInitialElementSelections().iterator();
	while (itemsToCheck.hasNext())
	fCheckBoxList.setChecked(itemsToCheck.next(), true);
	}

	@Override
	protected void okPressed() {
	if (fBuiltInFilters != null) {
	ArrayList result = new ArrayList();
	for (int i = 0; i < fBuiltInFilters.length; ++i) {
	if (fCheckBoxList.getChecked(fBuiltInFilters[i]))
	result.add(fBuiltInFilters[i]);
	}
	setResult(result);
	}
	super.okPressed();
	}

	private ILabelProvider createLabelPrivder() {
	return new LabelProvider() {
	@Override
	public Image getImage(Object element) {
	return null;
	}

	@Override
	public String getText(Object element) {
	if (element instanceof FilterDescriptor) {
	return ((FilterDescriptor) element).getName();
	}
	return null;
	}
	};
	}

	// ---------- result handling ----------

	@Override
	protected void setResult(List newResult) {
	super.setResult(newResult);
	if (fUserDefinedPatterns.getText().length() > 0) {
	fEnablePatterns = fEnableUserDefinedPatterns.getSelection();
	fPatterns = convertFromString(fUserDefinedPatterns.getText(),
	SEPARATOR);
	} else {
	fEnablePatterns = false;
	fPatterns = new String[0];
	}
	}

	/**
	* @return the patterns which have been entered by the user
	*/
	public String[] getUserDefinedPatterns() {
	return fPatterns;
	}

	/**
	* @return the Ids of the enabled built-in filters
	*/
	public String[] getEnabledFilterIds() {
	Object[] result = getResult();
	Set<String> enabledIds = new HashSet<>(result.length);
	for (int i = 0; i < result.length; i++)
	enabledIds.add(((FilterDescriptor) result[i]).getId());
	return enabledIds.toArray(new String[enabledIds.size()]);
	}

	/**
	* @return <code>true</code> if the user-defined patterns are disabled
	*/
	public boolean areUserDefinedPatternsEnabled() {
	return fEnablePatterns;
	}

	/**
	* @return a stack with the filter descriptor check history
	*
	*/
	public Stack getFilterDescriptorChangeHistory() {
	return fFilterDescriptorChangeHistory;
	}

	private FilterDescriptor[] getEnabledFilterDescriptors() {
	FilterDescriptor[] filterDescs = fBuiltInFilters;
	List<FilterDescriptor> result = new ArrayList<>(filterDescs.length);
	List<String> enabledFilterIds = Arrays.asList(fEnabledFilterIds);
	for (int i = 0; i < filterDescs.length; i++) {
	String id = filterDescs[i].getId();
	if (enabledFilterIds.contains(id))
	result.add(filterDescs[i]);
	}
	return result.toArray(new FilterDescriptor[result.size()]);
	}

	public static String[] convertFromString(String patterns,
	String separator) {
	StringTokenizer tokenizer = new StringTokenizer(patterns, separator,
	true);
	int tokenCount = tokenizer.countTokens();
	List<String> result = new ArrayList<>(tokenCount);
	boolean escape = false;
	boolean append = false;
	while (tokenizer.hasMoreTokens()) {
	String token = tokenizer.nextToken().trim();
	if (separator.equals(token)) {
	if (!escape)
	escape = true;
	else {
	addPattern(result, separator);
	append = true;
	}
	} else {
	if (!append)
	result.add(token);
	else
	addPattern(result, token);
	append = false;
	escape = false;
	}
	}
	return result.toArray(new String[result.size()]);
	}

	private static void addPattern(List<String> list, String pattern) {
	if (list.isEmpty())
	list.add(pattern);
	else {
	int index = list.size() - 1;
	list.set(index, (list.get(index)) + pattern);
	}
	}

	public static String convertToString(String[] patterns, String separator) {
	int length = patterns.length;
	StringBuffer strBuf = new StringBuffer();
	if (length > 0)
	strBuf.append(escapeSeparator(patterns[0], separator));
	else
	return ""; //$NON-NLS-1$
	int i = 1;
	while (i < length) {
	strBuf.append(separator);
	strBuf.append(" "); //$NON-NLS-1$
	strBuf.append(escapeSeparator(patterns[i++], separator));
	}
	return strBuf.toString();
	}

	private static String escapeSeparator(String pattern, String separator) {
	int length = pattern.length();
	StringBuffer buf = new StringBuffer(length);
	for (int i = 0; i < length; i++) {
	char ch = pattern.charAt(i);
	if (separator.equals(String.valueOf(ch)))
	buf.append(ch);
	buf.append(ch);
	}
	return buf.toString();

	}
	}