org.eclipse.help.ui/src/org/eclipse/help/ui/internal/search/InfoCenterPage.java - platform/eclipse.platform.ua - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2016 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.help.ui.internal.search;

 import java.util.ArrayList;
 import java.util.StringTokenizer;

 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.help.internal.workingset.AdaptableHelpResource;
 import org.eclipse.help.internal.workingset.AdaptableTocsArray;
 import org.eclipse.help.internal.workingset.WorkingSet;
 import org.eclipse.help.ui.RootScopePage;
 import org.eclipse.help.ui.internal.Messages;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.viewers.CheckStateChangedEvent;
 import org.eclipse.jface.viewers.CheckboxTreeViewer;
 import org.eclipse.jface.viewers.ILabelProvider;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.ITreeViewerListener;
 import org.eclipse.jface.viewers.TreeExpansionEvent;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;

 /**
  * Local Help participant in the federated search.
  */
 public class InfoCenterPage extends RootScopePage {
 	private Text urlText;

 	private Button searchAll;

 	private Button searchSelected;

 	private CheckboxTreeViewer tree;

 	private ITreeContentProvider treeContentProvider;

 	private ILabelProvider elementLabelProvider;

 	private AdaptableTocsArray remoteTocs;

 	//private boolean firstCheck;

 	private RemoteWorkingSet workingSet;

 	private boolean tocStale;

 	class RemoteWorkingSet extends WorkingSet {
 		public RemoteWorkingSet() {
 			super("InfoCenter"); //$NON-NLS-1$
 		}

 		public void load(IPreferenceStore store) {
 			String elements = store.getString(getKey(InfoCenterSearchScopeFactory.P_TOCS));
 			StringTokenizer stok = new StringTokenizer(elements, InfoCenterSearchScopeFactory.TOC_SEPARATOR);
 			ArrayList<AdaptableHelpResource> list = new ArrayList<>();
 			while (stok.hasMoreTokens()) {
 				final String url = stok.nextToken();
 				AdaptableHelpResource res = find(url);
 				if (res != null)
 					list.add(res);
 			}
 			setElements(list.toArray(new AdaptableHelpResource[list.size()]));
 		}

 		private AdaptableHelpResource find(String url) {
 			if (remoteTocs == null)
 				return null;
 			IAdaptable[] children = remoteTocs.getChildren();
 			for (int i = 0; i < children.length; i++) {
 				IAdaptable child = children[i];
 				if (child instanceof AdaptableHelpResource) {
 					AdaptableHelpResource res = (AdaptableHelpResource) child;
 					if (res.getHref().equals(url))
 						return res;
 				}
 			}
 			return null;
 		}

 		public void store(IPreferenceStore store) {
 			StringBuffer buf = new StringBuffer();
 			AdaptableHelpResource[] elements = getElements();

 			for (int i = 0; i < elements.length; i++) {
 				if (i > 0)
 					buf.append(InfoCenterSearchScopeFactory.TOC_SEPARATOR);
 				buf.append(elements[i].getHref());
 			}
 			store.setValue(getKey(InfoCenterSearchScopeFactory.P_TOCS), buf.toString());
 		}
 	}

 	/**
 	 * Default constructor.
 	 */
 	public InfoCenterPage() {
 		//firstCheck = true;
 	}

 	@Override
 	protected int createScopeContents(Composite parent) {
 		Font font = parent.getFont();
 		initializeDialogUnits(parent);

 		Label label = new Label(parent, SWT.NULL);
 		label.setText(Messages.InfoCenterPage_url);

 		urlText = new Text(parent, SWT.BORDER);
 		urlText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		urlText.setEditable(getEngineDescriptor().isUserDefined());

 		searchAll = new Button(parent, SWT.RADIO);
 		searchAll.setText(Messages.selectAll);
 		GridData gd = new GridData();
 		gd.horizontalSpan = 2;
 		searchAll.setLayoutData(gd);
 		searchAll.addSelectionListener(new SelectionAdapter() {

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				if (searchAll.getSelection())
 					tree.getTree().setEnabled(false);
 			}
 		});

 		searchSelected = new Button(parent, SWT.RADIO);
 		searchSelected.setText(Messages.selectWorkingSet);
 		gd = new GridData();
 		gd.horizontalSpan = 2;
 		searchSelected.setLayoutData(gd);
 		searchSelected.addSelectionListener(new SelectionAdapter() {

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				if (searchSelected.getSelection()) {
 					tree.getTree().setEnabled(true);
 					if (tocStale)
 						updateTocs();
 				}
 			}
 		});

 		label = new Label(parent, SWT.WRAP);
 		label.setFont(font);
 		label.setText(Messages.WorkingSetContent);
 		gd = new GridData(GridData.GRAB_HORIZONTAL
 				| GridData.HORIZONTAL_ALIGN_FILL
 				| GridData.VERTICAL_ALIGN_CENTER);
 		gd.horizontalSpan = 2;
 		label.setLayoutData(gd);

 		tree = new CheckboxTreeViewer(parent, SWT.BORDER | SWT.H_SCROLL
 				| SWT.V_SCROLL);
 		gd = new GridData(GridData.FILL_BOTH | GridData.GRAB_VERTICAL);
 		gd.heightHint = convertHeightInCharsToPixels(15);
 		gd.horizontalSpan = 2;
 		tree.getControl().setLayoutData(gd);
 		tree.getControl().setFont(font);

 		treeContentProvider = new HelpWorkingSetTreeContentProvider();
 		tree.setContentProvider(treeContentProvider);

 		elementLabelProvider = new HelpWorkingSetElementLabelProvider();
 		tree.setLabelProvider(elementLabelProvider);

 		tree.setUseHashlookup(true);

 		initializeControls();

 		tree.addCheckStateListener(event -> handleCheckStateChange(event));

 		tree.addTreeListener(new ITreeViewerListener() {

 			@Override
 			public void treeCollapsed(TreeExpansionEvent event) {
 			}

 			@Override
 			public void treeExpanded(TreeExpansionEvent event) {
 				final Object element = event.getElement();
 				if (tree.getGrayed(element) == false)
 					BusyIndicator.showWhile(getShell().getDisplay(),
 							() -> setSubtreeChecked(element, tree.getChecked(element), false));
 			}
 		});

 		applyDialogFont(parent);

 		// Set help for the page
 		// WorkbenchHelp.setHelp(tree, "help_workingset_page");
 		return 2;
 	}

 	/*
 	private void loadTocs(String urlName) {
 		InputStream is = null;
 		if (urlName==null || urlName.length()==0) {
 			resetRemoteTocs();
 			return;
 		}
 		try {
 			URL url = new URL(urlName);
 			url = new URL(url, "toc/"); //$NON-NLS-1$
 			URLConnection connection = url.openConnection();
 			is = connection.getInputStream();
 			BufferedReader reader = new BufferedReader(new InputStreamReader(
 					is, "utf-8"));//$NON-NLS-1$
 			load(reader);
 			reader.close();
 		} catch (MalformedURLException e) {
 			HelpUIPlugin.logError(Messages.InfoCenterPage_invalidURL, e, false, true);
 			resetRemoteTocs();
 		} catch (IOException e) {
 			HelpUIPlugin.logError(Messages.InfoCenterPage_tocError, e, false, true);
 			resetRemoteTocs();
 		} finally {
 			if (is != null) {
 				try {
 					is.close();
 				} catch (IOException e) {
 				}
 			}
 		}
 	}

 	private void resetRemoteTocs() {
 		remoteTocs = new AdaptableTocsArray(new IToc[0]);
 	}

 	private void load(Reader r) {
 		Document document = null;
 		try {
 			DocumentBuilder parser = DocumentBuilderFactory.newInstance()
 					.newDocumentBuilder();
 			parser.setEntityResolver(new LocalEntityResolver());
 			// parser.setProcessNamespace(true);
 			document = parser.parse(new InputSource(r));

 			// Strip out any comments first
 			Node root = document.getFirstChild();
 			while (root.getNodeType() == Node.COMMENT_NODE) {
 				document.removeChild(root);
 				root = document.getFirstChild();
 			}
 			load(document, (Element) root);
 		} catch (ParserConfigurationException e) {
 			// ignore
 		} catch (IOException e) {
 			// ignore
 		} catch (SAXException e) {
 			// ignore
 		}
 	}

 	private void load(Document doc, Element root) {
 		ArrayList list = new ArrayList();
 		NodeList engines = root.getElementsByTagName("toc"); //$NON-NLS-1$
 		for (int i = 0; i < engines.getLength(); i++) {
 			final Node node = engines.item(i);
 			IToc toc = new IToc() {
 				public ITopic[] getTopics() {
 					return new ITopic[0];
 				}
 				public ITopic getTopic(String href) {
 					return null;
 				}
 				public String getHref() {
 					return node.getAttributes().getNamedItem("href") //$NON-NLS-1$
 							.getNodeValue();
 				}
 				public String getLabel() {
 					return node.getAttributes().getNamedItem("label") //$NON-NLS-1$
 							.getNodeValue();
 				}
 				public IUAElement[] getChildren() {
 					return new IUAElement[0];
 				}
 				public boolean isEnabled(IEvaluationContext context) {
 					return true;
 				}
 			};
 			list.add(toc);
 		}
 		IToc[] tocs = (IToc[]) list.toArray(new IToc[list.size()]);
 		remoteTocs = new AdaptableTocsArray(tocs);
 	}
 	*/

 	private void initializeControls() {
 		IPreferenceStore store = getPreferenceStore();
 		String url = store
 				.getString(getKey(InfoCenterSearchScopeFactory.P_URL));
 		if (url.length() == 0) {
 			url = (String) getEngineDescriptor().getParameters().get(
 					InfoCenterSearchScopeFactory.P_URL);
 			if (url == null)
 				url = ""; //$NON-NLS-1$
 		}
 		urlText.setText(url);
 		//busyLoadTocs(url);
 		workingSet = new RemoteWorkingSet();
 		workingSet.load(store);
 		urlText.addModifyListener(e -> tocStale = true);
 		tree.setInput(remoteTocs);
 		boolean selected = false;
 		// store.getBoolean(getKey(InfoCenterSearchScopeFactory.P_SEARCH_SELECTED));
 		searchAll.setSelection(!selected);
 		searchSelected.setSelection(selected);
 		tree.getTree().setEnabled(selected);
 		searchAll.setEnabled(false);
 		searchSelected.setEnabled(false);
 		BusyIndicator.showWhile(getShell().getDisplay(), () -> {
 			Object[] elements = workingSet.getElements();
 			tree.setCheckedElements(elements);
 			for (int i = 0; i < elements.length; i++) {
 				Object element = elements[i];
 				if (isExpandable(element))
 					setSubtreeChecked(element, true, true);
 				updateParentState(element, true);
 			}
 		});
 	}

 	private void updateTocs() {
 		//String url = urlText.getText();
 		//busyLoadTocs(url);
 		tocStale=false;
 		tree.setInput(remoteTocs);
 		BusyIndicator.showWhile(getShell().getDisplay(), () -> {
 			Object[] elements = workingSet.getElements();
 			tree.setCheckedElements(elements);
 			for (int i = 0; i < elements.length; i++) {
 				Object element = elements[i];
 				if (isExpandable(element))
 					setSubtreeChecked(element, true, true);
 				updateParentState(element, true);
 			}
 		});
 	}

 	/*
 	private void busyLoadTocs(final String url) {
 		BusyIndicator.showWhile(urlText.getDisplay(), new Runnable() {
 			public void run() {
 				loadTocs(url);
 			}
 		});
 	}
 	*/

 	boolean isExpandable(Object element) {
 		return treeContentProvider.hasChildren(element);
 	}

 	void updateParentState(Object child, boolean baseChildState) {
 		if (child == null)
 			return;

 		Object parent = treeContentProvider.getParent(child);
 		if (parent == null)
 			return;

 		boolean allSameState = true;
 		Object[] children = null;
 		children = treeContentProvider.getChildren(parent);

 		for (int i = children.length - 1; i >= 0; i--) {
 			if (tree.getChecked(children[i]) != baseChildState
 					|| tree.getGrayed(children[i])) {
 				allSameState = false;
 				break;
 			}
 		}

 		tree.setGrayed(parent, !allSameState);
 		tree.setChecked(parent, !allSameState || baseChildState);

 		updateParentState(parent, baseChildState);
 	}

 	void setSubtreeChecked(Object parent, boolean state,
 			boolean checkExpandedState) {

 		Object[] children = treeContentProvider.getChildren(parent);
 		for (int i = children.length - 1; i >= 0; i--) {
 			Object element = children[i];
 			if (state) {
 				tree.setChecked(element, true);
 				tree.setGrayed(element, false);
 			} else
 				tree.setGrayChecked(element, false);
 			if (isExpandable(element))
 				setSubtreeChecked(element, state, checkExpandedState);
 		}
 	}

 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	private void findCheckedElements(java.util.List checkedResources,
 			Object parent) {
 		Object[] children = treeContentProvider.getChildren(parent);
 		for (int i = 0; i < children.length; i++) {
 			if (tree.getGrayed(children[i]))
 				findCheckedElements(checkedResources, children[i]);
 			else if (tree.getChecked(children[i]))
 				checkedResources.add(children[i]);
 		}
 	}

 	void handleCheckStateChange(final CheckStateChangedEvent event) {
 		BusyIndicator.showWhile(getShell().getDisplay(), () -> {
 			Object element = event.getElement();
 			boolean state = event.getChecked();
 			tree.setGrayed(element, false);
 			if (isExpandable(element))
 				setSubtreeChecked(element, state, state);
 			// only check subtree if state is set to true

 			updateParentState(element, state);
 			// validateInput();
 		});
 	}

 	public void updateWorkingSet() {
 		ArrayList<AdaptableHelpResource> elements = new ArrayList<>(10);
 		findCheckedElements(elements, tree.getInput());
 		workingSet.setElements(elements.toArray(new AdaptableHelpResource[elements.size()]));
 	}

 	@Override
 	public boolean performOk() {
 		IPreferenceStore store = getPreferenceStore();
 		if (getEngineDescriptor().isUserDefined())
 			store.setValue(getKey(InfoCenterSearchScopeFactory.P_URL), urlText
 					.getText());
 		updateWorkingSet();
 		workingSet.store(store);
 		store.setValue(getKey(InfoCenterSearchScopeFactory.P_SEARCH_SELECTED),
 				searchSelected.getSelection());
 		return super.performOk();
 	}

 	private String getKey(String key) {
 		return getEngineDescriptor().getId() + "." + key; //$NON-NLS-1$
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2016 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.help.ui.internal.search;

	import java.util.ArrayList;
	import java.util.StringTokenizer;

	import org.eclipse.core.runtime.IAdaptable;
	import org.eclipse.help.internal.workingset.AdaptableHelpResource;
	import org.eclipse.help.internal.workingset.AdaptableTocsArray;
	import org.eclipse.help.internal.workingset.WorkingSet;
	import org.eclipse.help.ui.RootScopePage;
	import org.eclipse.help.ui.internal.Messages;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.viewers.CheckStateChangedEvent;
	import org.eclipse.jface.viewers.CheckboxTreeViewer;
	import org.eclipse.jface.viewers.ILabelProvider;
	import org.eclipse.jface.viewers.ITreeContentProvider;
	import org.eclipse.jface.viewers.ITreeViewerListener;
	import org.eclipse.jface.viewers.TreeExpansionEvent;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.BusyIndicator;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;

	/**
	* Local Help participant in the federated search.
	*/
	public class InfoCenterPage extends RootScopePage {
	private Text urlText;

	private Button searchAll;

	private Button searchSelected;

	private CheckboxTreeViewer tree;

	private ITreeContentProvider treeContentProvider;

	private ILabelProvider elementLabelProvider;

	private AdaptableTocsArray remoteTocs;

	//private boolean firstCheck;

	private RemoteWorkingSet workingSet;

	private boolean tocStale;

	class RemoteWorkingSet extends WorkingSet {
	public RemoteWorkingSet() {
	super("InfoCenter"); //$NON-NLS-1$
	}

	public void load(IPreferenceStore store) {
	String elements = store.getString(getKey(InfoCenterSearchScopeFactory.P_TOCS));
	StringTokenizer stok = new StringTokenizer(elements, InfoCenterSearchScopeFactory.TOC_SEPARATOR);
	ArrayList<AdaptableHelpResource> list = new ArrayList<>();
	while (stok.hasMoreTokens()) {
	final String url = stok.nextToken();
	AdaptableHelpResource res = find(url);
	if (res != null)
	list.add(res);
	}
	setElements(list.toArray(new AdaptableHelpResource[list.size()]));
	}

	private AdaptableHelpResource find(String url) {
	if (remoteTocs == null)
	return null;
	IAdaptable[] children = remoteTocs.getChildren();
	for (int i = 0; i < children.length; i++) {
	IAdaptable child = children[i];
	if (child instanceof AdaptableHelpResource) {
	AdaptableHelpResource res = (AdaptableHelpResource) child;
	if (res.getHref().equals(url))
	return res;
	}
	}
	return null;
	}

	public void store(IPreferenceStore store) {
	StringBuffer buf = new StringBuffer();
	AdaptableHelpResource[] elements = getElements();

	for (int i = 0; i < elements.length; i++) {
	if (i > 0)
	buf.append(InfoCenterSearchScopeFactory.TOC_SEPARATOR);
	buf.append(elements[i].getHref());
	}
	store.setValue(getKey(InfoCenterSearchScopeFactory.P_TOCS), buf.toString());
	}
	}

	/**
	* Default constructor.
	*/
	public InfoCenterPage() {
	//firstCheck = true;
	}

	@Override
	protected int createScopeContents(Composite parent) {
	Font font = parent.getFont();
	initializeDialogUnits(parent);

	Label label = new Label(parent, SWT.NULL);
	label.setText(Messages.InfoCenterPage_url);

	urlText = new Text(parent, SWT.BORDER);
	urlText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	urlText.setEditable(getEngineDescriptor().isUserDefined());

	searchAll = new Button(parent, SWT.RADIO);
	searchAll.setText(Messages.selectAll);
	GridData gd = new GridData();
	gd.horizontalSpan = 2;
	searchAll.setLayoutData(gd);
	searchAll.addSelectionListener(new SelectionAdapter() {

	@Override
	public void widgetSelected(SelectionEvent e) {
	if (searchAll.getSelection())
	tree.getTree().setEnabled(false);
	}
	});

	searchSelected = new Button(parent, SWT.RADIO);
	searchSelected.setText(Messages.selectWorkingSet);
	gd = new GridData();
	gd.horizontalSpan = 2;
	searchSelected.setLayoutData(gd);
	searchSelected.addSelectionListener(new SelectionAdapter() {

	@Override
	public void widgetSelected(SelectionEvent e) {
	if (searchSelected.getSelection()) {
	tree.getTree().setEnabled(true);
	if (tocStale)
	updateTocs();
	}
	}
	});

	label = new Label(parent, SWT.WRAP);
	label.setFont(font);
	label.setText(Messages.WorkingSetContent);
	gd = new GridData(GridData.GRAB_HORIZONTAL
	\| GridData.HORIZONTAL_ALIGN_FILL
	\| GridData.VERTICAL_ALIGN_CENTER);
	gd.horizontalSpan = 2;
	label.setLayoutData(gd);

	tree = new CheckboxTreeViewer(parent, SWT.BORDER \| SWT.H_SCROLL
	\| SWT.V_SCROLL);
	gd = new GridData(GridData.FILL_BOTH \| GridData.GRAB_VERTICAL);
	gd.heightHint = convertHeightInCharsToPixels(15);
	gd.horizontalSpan = 2;
	tree.getControl().setLayoutData(gd);
	tree.getControl().setFont(font);

	treeContentProvider = new HelpWorkingSetTreeContentProvider();
	tree.setContentProvider(treeContentProvider);

	elementLabelProvider = new HelpWorkingSetElementLabelProvider();
	tree.setLabelProvider(elementLabelProvider);

	tree.setUseHashlookup(true);

	initializeControls();

	tree.addCheckStateListener(event -> handleCheckStateChange(event));

	tree.addTreeListener(new ITreeViewerListener() {

	@Override
	public void treeCollapsed(TreeExpansionEvent event) {
	}

	@Override
	public void treeExpanded(TreeExpansionEvent event) {
	final Object element = event.getElement();
	if (tree.getGrayed(element) == false)
	BusyIndicator.showWhile(getShell().getDisplay(),
	() -> setSubtreeChecked(element, tree.getChecked(element), false));
	}
	});

	applyDialogFont(parent);

	// Set help for the page
	// WorkbenchHelp.setHelp(tree, "help_workingset_page");
	return 2;
	}

	/*
	private void loadTocs(String urlName) {
	InputStream is = null;
	if (urlName==null \|\| urlName.length()==0) {
	resetRemoteTocs();
	return;
	}
	try {
	URL url = new URL(urlName);
	url = new URL(url, "toc/"); //$NON-NLS-1$
	URLConnection connection = url.openConnection();
	is = connection.getInputStream();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	is, "utf-8"));//$NON-NLS-1$
	load(reader);
	reader.close();
	} catch (MalformedURLException e) {
	HelpUIPlugin.logError(Messages.InfoCenterPage_invalidURL, e, false, true);
	resetRemoteTocs();
	} catch (IOException e) {
	HelpUIPlugin.logError(Messages.InfoCenterPage_tocError, e, false, true);
	resetRemoteTocs();
	} finally {
	if (is != null) {
	try {
	is.close();
	} catch (IOException e) {
	}
	}
	}
	}

	private void resetRemoteTocs() {
	remoteTocs = new AdaptableTocsArray(new IToc[0]);
	}

	private void load(Reader r) {
	Document document = null;
	try {
	DocumentBuilder parser = DocumentBuilderFactory.newInstance()
	.newDocumentBuilder();
	parser.setEntityResolver(new LocalEntityResolver());
	// parser.setProcessNamespace(true);
	document = parser.parse(new InputSource(r));

	// Strip out any comments first
	Node root = document.getFirstChild();
	while (root.getNodeType() == Node.COMMENT_NODE) {
	document.removeChild(root);
	root = document.getFirstChild();
	}
	load(document, (Element) root);
	} catch (ParserConfigurationException e) {
	// ignore
	} catch (IOException e) {
	// ignore
	} catch (SAXException e) {
	// ignore
	}
	}

	private void load(Document doc, Element root) {
	ArrayList list = new ArrayList();
	NodeList engines = root.getElementsByTagName("toc"); //$NON-NLS-1$
	for (int i = 0; i < engines.getLength(); i++) {
	final Node node = engines.item(i);
	IToc toc = new IToc() {
	public ITopic[] getTopics() {
	return new ITopic[0];
	}
	public ITopic getTopic(String href) {
	return null;
	}
	public String getHref() {
	return node.getAttributes().getNamedItem("href") //$NON-NLS-1$
	.getNodeValue();
	}
	public String getLabel() {
	return node.getAttributes().getNamedItem("label") //$NON-NLS-1$
	.getNodeValue();
	}
	public IUAElement[] getChildren() {
	return new IUAElement[0];
	}
	public boolean isEnabled(IEvaluationContext context) {
	return true;
	}
	};
	list.add(toc);
	}
	IToc[] tocs = (IToc[]) list.toArray(new IToc[list.size()]);
	remoteTocs = new AdaptableTocsArray(tocs);
	}
	*/

	private void initializeControls() {
	IPreferenceStore store = getPreferenceStore();
	String url = store
	.getString(getKey(InfoCenterSearchScopeFactory.P_URL));
	if (url.length() == 0) {
	url = (String) getEngineDescriptor().getParameters().get(
	InfoCenterSearchScopeFactory.P_URL);
	if (url == null)
	url = ""; //$NON-NLS-1$
	}
	urlText.setText(url);
	//busyLoadTocs(url);
	workingSet = new RemoteWorkingSet();
	workingSet.load(store);
	urlText.addModifyListener(e -> tocStale = true);
	tree.setInput(remoteTocs);
	boolean selected = false;
	// store.getBoolean(getKey(InfoCenterSearchScopeFactory.P_SEARCH_SELECTED));
	searchAll.setSelection(!selected);
	searchSelected.setSelection(selected);
	tree.getTree().setEnabled(selected);
	searchAll.setEnabled(false);
	searchSelected.setEnabled(false);
	BusyIndicator.showWhile(getShell().getDisplay(), () -> {
	Object[] elements = workingSet.getElements();
	tree.setCheckedElements(elements);
	for (int i = 0; i < elements.length; i++) {
	Object element = elements[i];
	if (isExpandable(element))
	setSubtreeChecked(element, true, true);
	updateParentState(element, true);
	}
	});
	}

	private void updateTocs() {
	//String url = urlText.getText();
	//busyLoadTocs(url);
	tocStale=false;
	tree.setInput(remoteTocs);
	BusyIndicator.showWhile(getShell().getDisplay(), () -> {
	Object[] elements = workingSet.getElements();
	tree.setCheckedElements(elements);
	for (int i = 0; i < elements.length; i++) {
	Object element = elements[i];
	if (isExpandable(element))
	setSubtreeChecked(element, true, true);
	updateParentState(element, true);
	}
	});
	}

	/*
	private void busyLoadTocs(final String url) {
	BusyIndicator.showWhile(urlText.getDisplay(), new Runnable() {
	public void run() {
	loadTocs(url);
	}
	});
	}
	*/

	boolean isExpandable(Object element) {
	return treeContentProvider.hasChildren(element);
	}

	void updateParentState(Object child, boolean baseChildState) {
	if (child == null)
	return;

	Object parent = treeContentProvider.getParent(child);
	if (parent == null)
	return;

	boolean allSameState = true;
	Object[] children = null;
	children = treeContentProvider.getChildren(parent);

	for (int i = children.length - 1; i >= 0; i--) {
	if (tree.getChecked(children[i]) != baseChildState
	\|\| tree.getGrayed(children[i])) {
	allSameState = false;
	break;
	}
	}

	tree.setGrayed(parent, !allSameState);
	tree.setChecked(parent, !allSameState \|\| baseChildState);

	updateParentState(parent, baseChildState);
	}

	void setSubtreeChecked(Object parent, boolean state,
	boolean checkExpandedState) {

	Object[] children = treeContentProvider.getChildren(parent);
	for (int i = children.length - 1; i >= 0; i--) {
	Object element = children[i];
	if (state) {
	tree.setChecked(element, true);
	tree.setGrayed(element, false);
	} else
	tree.setGrayChecked(element, false);
	if (isExpandable(element))
	setSubtreeChecked(element, state, checkExpandedState);
	}
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private void findCheckedElements(java.util.List checkedResources,
	Object parent) {
	Object[] children = treeContentProvider.getChildren(parent);
	for (int i = 0; i < children.length; i++) {
	if (tree.getGrayed(children[i]))
	findCheckedElements(checkedResources, children[i]);
	else if (tree.getChecked(children[i]))
	checkedResources.add(children[i]);
	}
	}

	void handleCheckStateChange(final CheckStateChangedEvent event) {
	BusyIndicator.showWhile(getShell().getDisplay(), () -> {
	Object element = event.getElement();
	boolean state = event.getChecked();
	tree.setGrayed(element, false);
	if (isExpandable(element))
	setSubtreeChecked(element, state, state);
	// only check subtree if state is set to true

	updateParentState(element, state);
	// validateInput();
	});
	}

	public void updateWorkingSet() {
	ArrayList<AdaptableHelpResource> elements = new ArrayList<>(10);
	findCheckedElements(elements, tree.getInput());
	workingSet.setElements(elements.toArray(new AdaptableHelpResource[elements.size()]));
	}

	@Override
	public boolean performOk() {
	IPreferenceStore store = getPreferenceStore();
	if (getEngineDescriptor().isUserDefined())
	store.setValue(getKey(InfoCenterSearchScopeFactory.P_URL), urlText
	.getText());
	updateWorkingSet();
	workingSet.store(store);
	store.setValue(getKey(InfoCenterSearchScopeFactory.P_SEARCH_SELECTED),
	searchSelected.getSelection());
	return super.performOk();
	}

	private String getKey(String key) {
	return getEngineDescriptor().getId() + "." + key; //$NON-NLS-1$
	}
	}