org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CodeAssistConfigurationBlock.java - jdt/eclipse.jdt.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2020 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Christian Georgi<christian.georgi@sap.com> - Bug 462770: Use OS symbol for 'Ctrl'
  *     Gábor Kövesdán - Contribution for Bug 350000 - [content assist] Include non-prefix matches in auto-complete suggestions
  *******************************************************************************/
 package org.eclipse.jdt.internal.ui.preferences;

 import java.util.Map;

 import org.eclipse.osgi.util.NLS;

 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.Point;
 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.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Link;
 import org.eclipse.swt.widgets.Text;

 import org.eclipse.core.runtime.IStatus;

 import org.eclipse.jface.bindings.keys.SWTKeySupport;
 import org.eclipse.jface.layout.PixelConverter;
 import org.eclipse.jface.preference.IPreferenceStore;

 import org.eclipse.ui.dialogs.PreferencesUtil;
 import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;

 import org.eclipse.jdt.core.JavaCore;

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

 import org.eclipse.jdt.ui.PreferenceConstants;

 import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
 import org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal;
 import org.eclipse.jdt.internal.ui.text.java.ProposalSorterHandle;
 import org.eclipse.jdt.internal.ui.text.java.ProposalSorterRegistry;
 import org.eclipse.jdt.internal.ui.wizards.IStatusChangeListener;
 import org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil;


 /**
  * Configures the content assist preferences.
  *
  * @since 3.0
  */
 class CodeAssistConfigurationBlock extends OptionsConfigurationBlock {

 	private static final Key PREF_CODEASSIST_AUTOACTIVATION= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION);
 	private static final Key PREF_CODEASSIST_AUTOACTIVATION_DELAY= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_DELAY);
 	private static final Key PREF_CODEASSIST_AUTOINSERT= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOINSERT);
 	private static final Key PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS= getJDTUIKey(PreferenceConstants.CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS);
 	private static final Key PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA);
 	private static final Key PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC);
 	private static final Key PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS= getJDTUIKey(PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS);
 	private static final Key PREF_CODEASSIST_SORTER= getJDTUIKey(PreferenceConstants.CODEASSIST_SORTER);
 	private static final Key PREF_CODEASSIST_CASE_SENSITIVITY= getJDTUIKey(PreferenceConstants.CODEASSIST_CASE_SENSITIVITY);
 	private static final Key PREF_CODEASSIST_ADDIMPORT= getJDTUIKey(PreferenceConstants.CODEASSIST_ADDIMPORT);
 	private static final Key PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS= getJDTCoreKey(JavaCore.CODEASSIST_SUGGEST_STATIC_IMPORTS);
 	private static final Key PREF_CODEASSIST_INSERT_COMPLETION= getJDTUIKey(PreferenceConstants.CODEASSIST_INSERT_COMPLETION);
 	private static final Key PREF_CODEASSIST_FILL_ARGUMENT_NAMES= getJDTUIKey(PreferenceConstants.CODEASSIST_FILL_ARGUMENT_NAMES);
 	private static final Key PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS= getJDTUIKey(PreferenceConstants.CODEASSIST_GUESS_METHOD_ARGUMENTS);
 	private static final Key PREF_CODEASSIST_PREFIX_COMPLETION= getJDTUIKey(PreferenceConstants.CODEASSIST_PREFIX_COMPLETION);
 	private static final Key PREF_CODEASSIST_DEPRECATION_CHECK= getJDTCoreKey(JavaCore.CODEASSIST_DEPRECATION_CHECK);
 	private static final Key PREF_CODEASSIST_CAMEL_CASE_MATCH= getJDTCoreKey(JavaCore.CODEASSIST_CAMEL_CASE_MATCH);
 	private static final Key PREF_CODEASSIST_SUBWORD_MATCH= getJDTCoreKey(JavaCore.CODEASSIST_SUBWORD_MATCH);

 	private static Key[] getAllKeys() {
 		return new Key[] {
 				PREF_CODEASSIST_AUTOACTIVATION,
 				PREF_CODEASSIST_AUTOACTIVATION_DELAY,
 				PREF_CODEASSIST_AUTOINSERT,
 				PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA,
 				PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC,
 				PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS,
 				PREF_CODEASSIST_SORTER,
 				PREF_CODEASSIST_CASE_SENSITIVITY,
 				PREF_CODEASSIST_ADDIMPORT,
 				PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS,
 				PREF_CODEASSIST_INSERT_COMPLETION,
 				PREF_CODEASSIST_FILL_ARGUMENT_NAMES,
 				PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS,
 				PREF_CODEASSIST_PREFIX_COMPLETION,
 				PREF_CODEASSIST_DEPRECATION_CHECK,
 				PREF_CODEASSIST_CAMEL_CASE_MATCH,
 				PREF_CODEASSIST_SUBWORD_MATCH,
 				PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS
 		};
 	}

 	private static final String[] trueFalse= new String[] { IPreferenceStore.TRUE, IPreferenceStore.FALSE };
 	private static final String[] enabledDisabled= new String[] { JavaCore.ENABLED, JavaCore.DISABLED };

 	private Button fCompletionInsertsRadioButton;
 	private Button fCompletionOverwritesRadioButton;
 	private Button fInsertParameterNamesRadioButton;
 	private Button fInsertBestGuessRadioButton;

 	public CodeAssistConfigurationBlock(IStatusChangeListener statusListener, IWorkbenchPreferenceContainer workbenchcontainer) {
 		super(statusListener, null, getAllKeys(), workbenchcontainer);
 	}

 	@Override
 	protected Control createContents(Composite parent) {
 		ScrolledPageContent scrolled= new ScrolledPageContent(parent, SWT.H_SCROLL | SWT.V_SCROLL);
 		scrolled.setExpandHorizontal(true);
 		scrolled.setExpandVertical(true);

 		Composite control= new Composite(scrolled, SWT.NONE);
 		GridLayout layout= new GridLayout();
 		layout.marginHeight= 0;
 		layout.marginWidth= 0;
 		control.setLayout(layout);

 		Composite composite;

 		composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_insertionSection_title);
 		addInsertionSection(composite);

 		composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_sortingSection_title);
 		addSortingSection(composite);

 		composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_autoactivationSection_title);
 		addAutoActivationSection(composite);

 		initialize();

 		scrolled.setContent(control);
 		final Point size= control.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 		scrolled.setMinSize(size.x, size.y);
 		return scrolled;
 	}

 	protected Composite createSubsection(Composite parent, String label) {
 		Group group= new Group(parent, SWT.SHADOW_NONE);
 		group.setText(label);
 		GridData data= new GridData(SWT.FILL, SWT.CENTER, true, false);
 		group.setLayoutData(data);
 		GridLayout layout= new GridLayout();
 		layout.numColumns= 3;
 		group.setLayout(layout);

 		return group;
 	}

 	private void addInsertionSection(Composite composite) {
 		addCompletionRadioButtons(composite);

 		String label;
 		label= PreferencesMessages.JavaEditorPreferencePage_insertSingleProposalsAutomatically;
 		addCheckBox(composite, label, PREF_CODEASSIST_AUTOINSERT, trueFalse, 0);

 		label= PreferencesMessages.JavaEditorPreferencePage_completePrefixes;
 		addCheckBox(composite, label, PREF_CODEASSIST_PREFIX_COMPLETION, trueFalse, 0);

 		addCheckBox(composite, PreferencesMessages.JavaEditorPreferencePage_disableCompletionProposalTriggerChars, PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS, trueFalse, 0);

 		label= PreferencesMessages.JavaEditorPreferencePage_automaticallyAddImportInsteadOfQualifiedName;
 		Button master= addCheckBox(composite, label, PREF_CODEASSIST_ADDIMPORT, trueFalse, 0);

 		label= PreferencesMessages.JavaEditorPreferencePage_suggestStaticImports;
 		Button slave= addCheckBoxWithLink(composite, label, PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS, enabledDisabled, 20, SWT.DEFAULT, new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				openStaticImportFavoritesPage();
 			}
 		});
 		createSelectionDependency(master, slave.getParent());


 		label= PreferencesMessages.JavaEditorPreferencePage_fillArgumentsOnMethodCompletion;
 		master= addCheckBox(composite, label, PREF_CODEASSIST_FILL_ARGUMENT_NAMES, trueFalse, 0);

 		Composite fillComposite= new Composite(composite, SWT.NONE);
 		GridData gd= new GridData();
 		gd.horizontalSpan= 2;
 		gd.horizontalIndent= LayoutUtil.getIndent();
 		fillComposite.setLayoutData(gd);
 		GridLayout layout= new GridLayout();
 		layout.marginWidth= 0;
 		layout.marginHeight= 0;
 		layout.numColumns= 2;
 		fillComposite.setLayout(layout);


 		SelectionListener completionSelectionListener= new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				boolean state= fInsertBestGuessRadioButton.getSelection();
 				setValue(PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS, state);
 			}
 		};

 		fInsertParameterNamesRadioButton= new Button(fillComposite, SWT.RADIO | SWT.LEFT);
 		fInsertParameterNamesRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_fillParameterNamesOnMethodCompletion);
 		fInsertParameterNamesRadioButton.setLayoutData(new GridData());
 		fInsertParameterNamesRadioButton.addSelectionListener(completionSelectionListener);

 		fInsertBestGuessRadioButton= new Button(fillComposite, SWT.RADIO | SWT.LEFT);
 		fInsertBestGuessRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_fillBestGuessedArgumentsOnMethodCompletion);
 		fInsertBestGuessRadioButton.setLayoutData(new GridData());
 		fInsertBestGuessRadioButton.addSelectionListener(completionSelectionListener);

 		createSelectionDependency(master, fInsertParameterNamesRadioButton);
 		createSelectionDependency(master, fInsertBestGuessRadioButton);
 	}

 	protected final void openStaticImportFavoritesPage() {
 		if (getPreferenceContainer() != null) {
 			getPreferenceContainer().openPage(CodeAssistFavoritesPreferencePage.PAGE_ID, null);
 		} else {
 			PreferencesUtil.createPreferenceDialogOn(getShell(), CodeAssistFavoritesPreferencePage.PAGE_ID, null, null).open();
 		}
 	}

 	/**
 	 * Creates a selection dependency between a master and a slave control.
 	 *
 	 * @param master
 	 *                   The master button that controls the state of the slave
 	 * @param slave
 	 *                   The slave control that is enabled only if the master is
 	 *                   selected
 	 */
 	protected static void createSelectionDependency(final Button master, final Control slave) {
 		master.addSelectionListener(new SelectionAdapter() {

 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				deepSetEnabled(slave, master.getSelection());
 			}

 			private void deepSetEnabled(final Control control, boolean enabled) {
 				control.setEnabled(enabled);
 				if (control instanceof Composite) {
 					for (Control child : ((Composite)control).getChildren()) {
 						deepSetEnabled(child, enabled);
 					}
 				}
 			}
 		});
 		slave.setEnabled(master.getSelection());
 	}

 	private void addSortingSection(Composite composite) {
 		String label;

 		label= PreferencesMessages.CodeAssistConfigurationBlock_typeFilters_link;
 		createPreferencePageLink(composite, label, null);
 		new Label(composite, SWT.NONE);

 		label= PreferencesMessages.JavaEditorPreferencePage_presentProposalsInAlphabeticalOrder;
 		ProposalSorterHandle[] sorters= ProposalSorterRegistry.getDefault().getSorters();
 		String[] labels= new String[sorters.length];
 		String[] values= new String[sorters.length];
 		for (int i= 0; i < sorters.length; i++) {
 			ProposalSorterHandle handle= sorters[i];
 			labels[i]= handle.getName();
 			values[i]= handle.getId();
 		}

 		addComboBox(composite, label, PREF_CODEASSIST_SORTER, values, labels, 0);

 		label= PreferencesMessages.CodeAssistConfigurationBlock_matchCamelCase_label;
 		addCheckBox(composite, label, PREF_CODEASSIST_CAMEL_CASE_MATCH, enabledDisabled, 0);

 		label= PreferencesMessages.CodeAssistConfigurationBlock_matchSubword_label;
 		addCheckBox(composite, label, PREF_CODEASSIST_SUBWORD_MATCH, enabledDisabled, 0);

 		label= PreferencesMessages.JavaEditorPreferencePage_showOnlyProposalsVisibleInTheInvocationContext;
 		addCheckBox(composite, label, PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS, trueFalse, 0);

 		label= PreferencesMessages.CodeAssistConfigurationBlock_hideDeprecated_label;
 		addCheckBox(composite, label, PREF_CODEASSIST_DEPRECATION_CHECK, enabledDisabled, 0);
 	}

 	private void createPreferencePageLink(Composite composite, String label, final Map<String, String> targetInfo) {
 		final Link link= new Link(composite, SWT.NONE);
 		link.setText(label);
 		link.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				PreferencesUtil.createPreferenceDialogOn(link.getShell(), e.text, null, targetInfo);
 			}
 		});
 	}

 	private void addAutoActivationSection(Composite composite) {
 		String label;
 		label= PreferencesMessages.JavaEditorPreferencePage_enableAutoActivation;
 		final Button autoactivation= addCheckBox(composite, label, PREF_CODEASSIST_AUTOACTIVATION, trueFalse, 0);
 		autoactivation.addSelectionListener(new SelectionAdapter(){
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				updateAutoactivationControls();
 			}
 		});

 		label= PreferencesMessages.JavaEditorPreferencePage_autoActivationDelay;
 		addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_DELAY, 4, 20);

 		label= PreferencesMessages.JavaEditorPreferencePage_autoActivationTriggersForJava;
 		addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA, 100, 4, 20);

 		label= PreferencesMessages.JavaEditorPreferencePage_autoActivationTriggersForJavaDoc;
 		addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC, 100, 4, 20);
 	}


 	protected Text addLabelledTextField(Composite parent, String label, Key key, int textlimit, int indent) {
 		return addLabelledTextField(parent, label, key, textlimit, textlimit, indent);
 	}

 	protected Text addLabelledTextField(Composite parent, String label, Key key, int modelTextLimit, int fieldTextLimit, int indent) {
 		PixelConverter pixelConverter= new PixelConverter(parent);

 		Label labelControl= new Label(parent, SWT.NONE);
 		labelControl.setText(label);
 		GridData data= new GridData();
 		data.horizontalIndent= indent;
 		labelControl.setLayoutData(data);

 		Text textBox= new Text(parent, SWT.BORDER | SWT.SINGLE);
 		textBox.setData(key);
 		textBox.setLayoutData(new GridData());

 		fLabels.put(textBox, labelControl);

 		String currValue= getValue(key);
 		if (currValue != null) {
 			textBox.setText(currValue);
 		}
 		textBox.addModifyListener(getTextModifyListener());

 		data= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		if (modelTextLimit != 0)
 			textBox.setTextLimit(modelTextLimit);

 		if (fieldTextLimit != 0)
 			data.widthHint= pixelConverter.convertWidthInCharsToPixels(fieldTextLimit + 1);

 		data.horizontalSpan= 2;
 		textBox.setLayoutData(data);

 		fTextBoxes.add(textBox);
 		return textBox;
 	}

 	private void addCompletionRadioButtons(Composite contentAssistComposite) {
 		Composite completionComposite= new Composite(contentAssistComposite, SWT.NONE);
 		GridData ccgd= new GridData();
 		ccgd.horizontalSpan= 2;
 		completionComposite.setLayoutData(ccgd);
 		GridLayout ccgl= new GridLayout();
 		ccgl.marginWidth= 0;
 		ccgl.numColumns= 2;
 		completionComposite.setLayout(ccgl);

 		SelectionListener completionSelectionListener= new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				boolean insert= fCompletionInsertsRadioButton.getSelection();
 				setValue(PREF_CODEASSIST_INSERT_COMPLETION, insert);
 			}
 		};

 		fCompletionInsertsRadioButton= new Button(completionComposite, SWT.RADIO | SWT.LEFT);
 		fCompletionInsertsRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_completionInserts);
 		fCompletionInsertsRadioButton.setLayoutData(new GridData());
 		fCompletionInsertsRadioButton.addSelectionListener(completionSelectionListener);

 		fCompletionOverwritesRadioButton= new Button(completionComposite, SWT.RADIO | SWT.LEFT);
 		fCompletionOverwritesRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_completionOverwrites);
 		fCompletionOverwritesRadioButton.setLayoutData(new GridData());
 		fCompletionOverwritesRadioButton.addSelectionListener(completionSelectionListener);

 		Label label= new Label(completionComposite, SWT.NONE);
 		String modifier= SWTKeySupport.getKeyFormatterForPlatform().format(AbstractJavaCompletionProposal.MODIFIER_TOGGLE_COMPLETION_MODE);
 		label.setText(NLS.bind(PreferencesMessages.JavaEditorPreferencePage_completionToggleHint, modifier));
 		GridData gd= new GridData();
 		gd.horizontalIndent= LayoutUtil.getIndent();
 		gd.horizontalSpan= 2;
 		label.setLayoutData(gd);
 	}

 	public void initialize() {
 		initializeFields();
 	}

 	private void initializeFields() {
 		boolean value= getBooleanValue(PREF_CODEASSIST_INSERT_COMPLETION);
 		fCompletionInsertsRadioButton.setSelection(value);
 		fCompletionOverwritesRadioButton.setSelection(!value);
 		value= getBooleanValue(PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS);
 		fInsertBestGuessRadioButton.setSelection(value);
 		fInsertParameterNamesRadioButton.setSelection(!value);

 		value= getBooleanValue(PREF_CODEASSIST_FILL_ARGUMENT_NAMES);
 		fInsertParameterNamesRadioButton.setEnabled(value);
 		fInsertBestGuessRadioButton.setEnabled(value);

 		updateAutoactivationControls();
  	}

     private void updateAutoactivationControls() {
         boolean autoactivation= getBooleanValue(PREF_CODEASSIST_AUTOACTIVATION);
         setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_DELAY, autoactivation);
         setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA, autoactivation);
         setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC, autoactivation);
     }


 	@Override
 	public void performDefaults() {
 		super.performDefaults();
 		initializeFields();
 	}

 	@Override
 	protected String[] getFullBuildDialogStrings(boolean workspaceSettings) {
 		return null;
 	}

 	/**
 	 * Validates that the specified number is positive.
 	 *
 	 * @param number
 	 *                   The number to validate
 	 * @return The status of the validation
 	 */
 	protected static IStatus validatePositiveNumber(final String number) {

 		final StatusInfo status= new StatusInfo();
 		if (number.length() == 0) {
 			status.setError(PreferencesMessages.SpellingPreferencePage_empty_threshold);
 		} else {
 			try {
 				final int value= Integer.parseInt(number);
 				if (value < 0) {
 					status.setError(Messages.format(PreferencesMessages.SpellingPreferencePage_invalid_threshold, number));
 				}
 			} catch (NumberFormatException exception) {
 				status.setError(Messages.format(PreferencesMessages.SpellingPreferencePage_invalid_threshold, number));
 			}
 		}
 		return status;
 	}

 	@Override
 	protected void validateSettings(Key key, String oldValue, String newValue) {
 		if (key == null || PREF_CODEASSIST_AUTOACTIVATION_DELAY.equals(key))
 			fContext.statusChanged(validatePositiveNumber(getValue(PREF_CODEASSIST_AUTOACTIVATION_DELAY)));
 	}

 	protected void setControlEnabled(Key key, boolean enabled) {
 		Control control= getControl(key);
 		control.setEnabled(enabled);
 		Label label= fLabels.get(control);
 		if (label != null)
 			label.setEnabled(enabled);
 	}

 	private Control getControl(Key key) {
 		for (int i= fComboBoxes.size() - 1; i >= 0; i--) {
 			Control curr= fComboBoxes.get(i);
 			ControlData data= (ControlData) curr.getData();
 			if (key.equals(data.getKey())) {
 				return curr;
 			}
 		}
 		for (int i= fCheckBoxes.size() - 1; i >= 0; i--) {
 			Control curr= fCheckBoxes.get(i);
 			ControlData data= (ControlData) curr.getData();
 			if (key.equals(data.getKey())) {
 				return curr;
 			}
 		}
 		for (int i= fTextBoxes.size() - 1; i >= 0; i--) {
 			Control curr= fTextBoxes.get(i);
 			Key currKey= (Key) curr.getData();
 			if (key.equals(currKey)) {
 				return curr;
 			}
 		}
 		return null;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2020 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	* Christian Georgi<christian.georgi@sap.com> - Bug 462770: Use OS symbol for 'Ctrl'
	* Gábor Kövesdán - Contribution for Bug 350000 - [content assist] Include non-prefix matches in auto-complete suggestions
	*******************************************************************************/
	package org.eclipse.jdt.internal.ui.preferences;

	import java.util.Map;

	import org.eclipse.osgi.util.NLS;

	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.Point;
	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.Group;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Link;
	import org.eclipse.swt.widgets.Text;

	import org.eclipse.core.runtime.IStatus;

	import org.eclipse.jface.bindings.keys.SWTKeySupport;
	import org.eclipse.jface.layout.PixelConverter;
	import org.eclipse.jface.preference.IPreferenceStore;

	import org.eclipse.ui.dialogs.PreferencesUtil;
	import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;

	import org.eclipse.jdt.core.JavaCore;

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

	import org.eclipse.jdt.ui.PreferenceConstants;

	import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
	import org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal;
	import org.eclipse.jdt.internal.ui.text.java.ProposalSorterHandle;
	import org.eclipse.jdt.internal.ui.text.java.ProposalSorterRegistry;
	import org.eclipse.jdt.internal.ui.wizards.IStatusChangeListener;
	import org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil;


	/**
	* Configures the content assist preferences.
	*
	* @since 3.0
	*/
	class CodeAssistConfigurationBlock extends OptionsConfigurationBlock {

	private static final Key PREF_CODEASSIST_AUTOACTIVATION= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION);
	private static final Key PREF_CODEASSIST_AUTOACTIVATION_DELAY= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_DELAY);
	private static final Key PREF_CODEASSIST_AUTOINSERT= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOINSERT);
	private static final Key PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS= getJDTUIKey(PreferenceConstants.CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS);
	private static final Key PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA);
	private static final Key PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC= getJDTUIKey(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC);
	private static final Key PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS= getJDTUIKey(PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS);
	private static final Key PREF_CODEASSIST_SORTER= getJDTUIKey(PreferenceConstants.CODEASSIST_SORTER);
	private static final Key PREF_CODEASSIST_CASE_SENSITIVITY= getJDTUIKey(PreferenceConstants.CODEASSIST_CASE_SENSITIVITY);
	private static final Key PREF_CODEASSIST_ADDIMPORT= getJDTUIKey(PreferenceConstants.CODEASSIST_ADDIMPORT);
	private static final Key PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS= getJDTCoreKey(JavaCore.CODEASSIST_SUGGEST_STATIC_IMPORTS);
	private static final Key PREF_CODEASSIST_INSERT_COMPLETION= getJDTUIKey(PreferenceConstants.CODEASSIST_INSERT_COMPLETION);
	private static final Key PREF_CODEASSIST_FILL_ARGUMENT_NAMES= getJDTUIKey(PreferenceConstants.CODEASSIST_FILL_ARGUMENT_NAMES);
	private static final Key PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS= getJDTUIKey(PreferenceConstants.CODEASSIST_GUESS_METHOD_ARGUMENTS);
	private static final Key PREF_CODEASSIST_PREFIX_COMPLETION= getJDTUIKey(PreferenceConstants.CODEASSIST_PREFIX_COMPLETION);
	private static final Key PREF_CODEASSIST_DEPRECATION_CHECK= getJDTCoreKey(JavaCore.CODEASSIST_DEPRECATION_CHECK);
	private static final Key PREF_CODEASSIST_CAMEL_CASE_MATCH= getJDTCoreKey(JavaCore.CODEASSIST_CAMEL_CASE_MATCH);
	private static final Key PREF_CODEASSIST_SUBWORD_MATCH= getJDTCoreKey(JavaCore.CODEASSIST_SUBWORD_MATCH);

	private static Key[] getAllKeys() {
	return new Key[] {
	PREF_CODEASSIST_AUTOACTIVATION,
	PREF_CODEASSIST_AUTOACTIVATION_DELAY,
	PREF_CODEASSIST_AUTOINSERT,
	PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA,
	PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC,
	PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS,
	PREF_CODEASSIST_SORTER,
	PREF_CODEASSIST_CASE_SENSITIVITY,
	PREF_CODEASSIST_ADDIMPORT,
	PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS,
	PREF_CODEASSIST_INSERT_COMPLETION,
	PREF_CODEASSIST_FILL_ARGUMENT_NAMES,
	PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS,
	PREF_CODEASSIST_PREFIX_COMPLETION,
	PREF_CODEASSIST_DEPRECATION_CHECK,
	PREF_CODEASSIST_CAMEL_CASE_MATCH,
	PREF_CODEASSIST_SUBWORD_MATCH,
	PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS
	};
	}

	private static final String[] trueFalse= new String[] { IPreferenceStore.TRUE, IPreferenceStore.FALSE };
	private static final String[] enabledDisabled= new String[] { JavaCore.ENABLED, JavaCore.DISABLED };

	private Button fCompletionInsertsRadioButton;
	private Button fCompletionOverwritesRadioButton;
	private Button fInsertParameterNamesRadioButton;
	private Button fInsertBestGuessRadioButton;

	public CodeAssistConfigurationBlock(IStatusChangeListener statusListener, IWorkbenchPreferenceContainer workbenchcontainer) {
	super(statusListener, null, getAllKeys(), workbenchcontainer);
	}

	@Override
	protected Control createContents(Composite parent) {
	ScrolledPageContent scrolled= new ScrolledPageContent(parent, SWT.H_SCROLL \| SWT.V_SCROLL);
	scrolled.setExpandHorizontal(true);
	scrolled.setExpandVertical(true);

	Composite control= new Composite(scrolled, SWT.NONE);
	GridLayout layout= new GridLayout();
	layout.marginHeight= 0;
	layout.marginWidth= 0;
	control.setLayout(layout);

	Composite composite;

	composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_insertionSection_title);
	addInsertionSection(composite);

	composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_sortingSection_title);
	addSortingSection(composite);

	composite= createSubsection(control, PreferencesMessages.CodeAssistConfigurationBlock_autoactivationSection_title);
	addAutoActivationSection(composite);

	initialize();

	scrolled.setContent(control);
	final Point size= control.computeSize(SWT.DEFAULT, SWT.DEFAULT);
	scrolled.setMinSize(size.x, size.y);
	return scrolled;
	}

	protected Composite createSubsection(Composite parent, String label) {
	Group group= new Group(parent, SWT.SHADOW_NONE);
	group.setText(label);
	GridData data= new GridData(SWT.FILL, SWT.CENTER, true, false);
	group.setLayoutData(data);
	GridLayout layout= new GridLayout();
	layout.numColumns= 3;
	group.setLayout(layout);

	return group;
	}

	private void addInsertionSection(Composite composite) {
	addCompletionRadioButtons(composite);

	String label;
	label= PreferencesMessages.JavaEditorPreferencePage_insertSingleProposalsAutomatically;
	addCheckBox(composite, label, PREF_CODEASSIST_AUTOINSERT, trueFalse, 0);

	label= PreferencesMessages.JavaEditorPreferencePage_completePrefixes;
	addCheckBox(composite, label, PREF_CODEASSIST_PREFIX_COMPLETION, trueFalse, 0);

	addCheckBox(composite, PreferencesMessages.JavaEditorPreferencePage_disableCompletionProposalTriggerChars, PREF_CODEASSIST_DISABLE_COMPLETION_PROPOSAL_TRIGGER_CHARS, trueFalse, 0);

	label= PreferencesMessages.JavaEditorPreferencePage_automaticallyAddImportInsteadOfQualifiedName;
	Button master= addCheckBox(composite, label, PREF_CODEASSIST_ADDIMPORT, trueFalse, 0);

	label= PreferencesMessages.JavaEditorPreferencePage_suggestStaticImports;
	Button slave= addCheckBoxWithLink(composite, label, PREF_CODEASSIST_SUGGEST_STATIC_IMPORTS, enabledDisabled, 20, SWT.DEFAULT, new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	openStaticImportFavoritesPage();
	}
	});
	createSelectionDependency(master, slave.getParent());


	label= PreferencesMessages.JavaEditorPreferencePage_fillArgumentsOnMethodCompletion;
	master= addCheckBox(composite, label, PREF_CODEASSIST_FILL_ARGUMENT_NAMES, trueFalse, 0);

	Composite fillComposite= new Composite(composite, SWT.NONE);
	GridData gd= new GridData();
	gd.horizontalSpan= 2;
	gd.horizontalIndent= LayoutUtil.getIndent();
	fillComposite.setLayoutData(gd);
	GridLayout layout= new GridLayout();
	layout.marginWidth= 0;
	layout.marginHeight= 0;
	layout.numColumns= 2;
	fillComposite.setLayout(layout);


	SelectionListener completionSelectionListener= new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	boolean state= fInsertBestGuessRadioButton.getSelection();
	setValue(PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS, state);
	}
	};

	fInsertParameterNamesRadioButton= new Button(fillComposite, SWT.RADIO \| SWT.LEFT);
	fInsertParameterNamesRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_fillParameterNamesOnMethodCompletion);
	fInsertParameterNamesRadioButton.setLayoutData(new GridData());
	fInsertParameterNamesRadioButton.addSelectionListener(completionSelectionListener);

	fInsertBestGuessRadioButton= new Button(fillComposite, SWT.RADIO \| SWT.LEFT);
	fInsertBestGuessRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_fillBestGuessedArgumentsOnMethodCompletion);
	fInsertBestGuessRadioButton.setLayoutData(new GridData());
	fInsertBestGuessRadioButton.addSelectionListener(completionSelectionListener);

	createSelectionDependency(master, fInsertParameterNamesRadioButton);
	createSelectionDependency(master, fInsertBestGuessRadioButton);
	}

	protected final void openStaticImportFavoritesPage() {
	if (getPreferenceContainer() != null) {
	getPreferenceContainer().openPage(CodeAssistFavoritesPreferencePage.PAGE_ID, null);
	} else {
	PreferencesUtil.createPreferenceDialogOn(getShell(), CodeAssistFavoritesPreferencePage.PAGE_ID, null, null).open();
	}
	}

	/**
	* Creates a selection dependency between a master and a slave control.
	*
	* @param master
	* The master button that controls the state of the slave
	* @param slave
	* The slave control that is enabled only if the master is
	* selected
	*/
	protected static void createSelectionDependency(final Button master, final Control slave) {
	master.addSelectionListener(new SelectionAdapter() {

	@Override
	public void widgetSelected(SelectionEvent event) {
	deepSetEnabled(slave, master.getSelection());
	}

	private void deepSetEnabled(final Control control, boolean enabled) {
	control.setEnabled(enabled);
	if (control instanceof Composite) {
	for (Control child : ((Composite)control).getChildren()) {
	deepSetEnabled(child, enabled);
	}
	}
	}
	});
	slave.setEnabled(master.getSelection());
	}

	private void addSortingSection(Composite composite) {
	String label;

	label= PreferencesMessages.CodeAssistConfigurationBlock_typeFilters_link;
	createPreferencePageLink(composite, label, null);
	new Label(composite, SWT.NONE);

	label= PreferencesMessages.JavaEditorPreferencePage_presentProposalsInAlphabeticalOrder;
	ProposalSorterHandle[] sorters= ProposalSorterRegistry.getDefault().getSorters();
	String[] labels= new String[sorters.length];
	String[] values= new String[sorters.length];
	for (int i= 0; i < sorters.length; i++) {
	ProposalSorterHandle handle= sorters[i];
	labels[i]= handle.getName();
	values[i]= handle.getId();
	}

	addComboBox(composite, label, PREF_CODEASSIST_SORTER, values, labels, 0);

	label= PreferencesMessages.CodeAssistConfigurationBlock_matchCamelCase_label;
	addCheckBox(composite, label, PREF_CODEASSIST_CAMEL_CASE_MATCH, enabledDisabled, 0);

	label= PreferencesMessages.CodeAssistConfigurationBlock_matchSubword_label;
	addCheckBox(composite, label, PREF_CODEASSIST_SUBWORD_MATCH, enabledDisabled, 0);

	label= PreferencesMessages.JavaEditorPreferencePage_showOnlyProposalsVisibleInTheInvocationContext;
	addCheckBox(composite, label, PREF_CODEASSIST_SHOW_VISIBLE_PROPOSALS, trueFalse, 0);

	label= PreferencesMessages.CodeAssistConfigurationBlock_hideDeprecated_label;
	addCheckBox(composite, label, PREF_CODEASSIST_DEPRECATION_CHECK, enabledDisabled, 0);
	}

	private void createPreferencePageLink(Composite composite, String label, final Map<String, String> targetInfo) {
	final Link link= new Link(composite, SWT.NONE);
	link.setText(label);
	link.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	PreferencesUtil.createPreferenceDialogOn(link.getShell(), e.text, null, targetInfo);
	}
	});
	}

	private void addAutoActivationSection(Composite composite) {
	String label;
	label= PreferencesMessages.JavaEditorPreferencePage_enableAutoActivation;
	final Button autoactivation= addCheckBox(composite, label, PREF_CODEASSIST_AUTOACTIVATION, trueFalse, 0);
	autoactivation.addSelectionListener(new SelectionAdapter(){
	@Override
	public void widgetSelected(SelectionEvent e) {
	updateAutoactivationControls();
	}
	});

	label= PreferencesMessages.JavaEditorPreferencePage_autoActivationDelay;
	addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_DELAY, 4, 20);

	label= PreferencesMessages.JavaEditorPreferencePage_autoActivationTriggersForJava;
	addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA, 100, 4, 20);

	label= PreferencesMessages.JavaEditorPreferencePage_autoActivationTriggersForJavaDoc;
	addLabelledTextField(composite, label, PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC, 100, 4, 20);
	}


	protected Text addLabelledTextField(Composite parent, String label, Key key, int textlimit, int indent) {
	return addLabelledTextField(parent, label, key, textlimit, textlimit, indent);
	}

	protected Text addLabelledTextField(Composite parent, String label, Key key, int modelTextLimit, int fieldTextLimit, int indent) {
	PixelConverter pixelConverter= new PixelConverter(parent);

	Label labelControl= new Label(parent, SWT.NONE);
	labelControl.setText(label);
	GridData data= new GridData();
	data.horizontalIndent= indent;
	labelControl.setLayoutData(data);

	Text textBox= new Text(parent, SWT.BORDER \| SWT.SINGLE);
	textBox.setData(key);
	textBox.setLayoutData(new GridData());

	fLabels.put(textBox, labelControl);

	String currValue= getValue(key);
	if (currValue != null) {
	textBox.setText(currValue);
	}
	textBox.addModifyListener(getTextModifyListener());

	data= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	if (modelTextLimit != 0)
	textBox.setTextLimit(modelTextLimit);

	if (fieldTextLimit != 0)
	data.widthHint= pixelConverter.convertWidthInCharsToPixels(fieldTextLimit + 1);

	data.horizontalSpan= 2;
	textBox.setLayoutData(data);

	fTextBoxes.add(textBox);
	return textBox;
	}

	private void addCompletionRadioButtons(Composite contentAssistComposite) {
	Composite completionComposite= new Composite(contentAssistComposite, SWT.NONE);
	GridData ccgd= new GridData();
	ccgd.horizontalSpan= 2;
	completionComposite.setLayoutData(ccgd);
	GridLayout ccgl= new GridLayout();
	ccgl.marginWidth= 0;
	ccgl.numColumns= 2;
	completionComposite.setLayout(ccgl);

	SelectionListener completionSelectionListener= new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	boolean insert= fCompletionInsertsRadioButton.getSelection();
	setValue(PREF_CODEASSIST_INSERT_COMPLETION, insert);
	}
	};

	fCompletionInsertsRadioButton= new Button(completionComposite, SWT.RADIO \| SWT.LEFT);
	fCompletionInsertsRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_completionInserts);
	fCompletionInsertsRadioButton.setLayoutData(new GridData());
	fCompletionInsertsRadioButton.addSelectionListener(completionSelectionListener);

	fCompletionOverwritesRadioButton= new Button(completionComposite, SWT.RADIO \| SWT.LEFT);
	fCompletionOverwritesRadioButton.setText(PreferencesMessages.JavaEditorPreferencePage_completionOverwrites);
	fCompletionOverwritesRadioButton.setLayoutData(new GridData());
	fCompletionOverwritesRadioButton.addSelectionListener(completionSelectionListener);

	Label label= new Label(completionComposite, SWT.NONE);
	String modifier= SWTKeySupport.getKeyFormatterForPlatform().format(AbstractJavaCompletionProposal.MODIFIER_TOGGLE_COMPLETION_MODE);
	label.setText(NLS.bind(PreferencesMessages.JavaEditorPreferencePage_completionToggleHint, modifier));
	GridData gd= new GridData();
	gd.horizontalIndent= LayoutUtil.getIndent();
	gd.horizontalSpan= 2;
	label.setLayoutData(gd);
	}

	public void initialize() {
	initializeFields();
	}

	private void initializeFields() {
	boolean value= getBooleanValue(PREF_CODEASSIST_INSERT_COMPLETION);
	fCompletionInsertsRadioButton.setSelection(value);
	fCompletionOverwritesRadioButton.setSelection(!value);
	value= getBooleanValue(PREF_CODEASSIST_GUESS_METHOD_ARGUMENTS);
	fInsertBestGuessRadioButton.setSelection(value);
	fInsertParameterNamesRadioButton.setSelection(!value);

	value= getBooleanValue(PREF_CODEASSIST_FILL_ARGUMENT_NAMES);
	fInsertParameterNamesRadioButton.setEnabled(value);
	fInsertBestGuessRadioButton.setEnabled(value);

	updateAutoactivationControls();
	}

	private void updateAutoactivationControls() {
	boolean autoactivation= getBooleanValue(PREF_CODEASSIST_AUTOACTIVATION);
	setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_DELAY, autoactivation);
	setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA, autoactivation);
	setControlEnabled(PREF_CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC, autoactivation);
	}


	@Override
	public void performDefaults() {
	super.performDefaults();
	initializeFields();
	}

	@Override
	protected String[] getFullBuildDialogStrings(boolean workspaceSettings) {
	return null;
	}

	/**
	* Validates that the specified number is positive.
	*
	* @param number
	* The number to validate
	* @return The status of the validation
	*/
	protected static IStatus validatePositiveNumber(final String number) {

	final StatusInfo status= new StatusInfo();
	if (number.length() == 0) {
	status.setError(PreferencesMessages.SpellingPreferencePage_empty_threshold);
	} else {
	try {
	final int value= Integer.parseInt(number);
	if (value < 0) {
	status.setError(Messages.format(PreferencesMessages.SpellingPreferencePage_invalid_threshold, number));
	}
	} catch (NumberFormatException exception) {
	status.setError(Messages.format(PreferencesMessages.SpellingPreferencePage_invalid_threshold, number));
	}
	}
	return status;
	}

	@Override
	protected void validateSettings(Key key, String oldValue, String newValue) {
	if (key == null \|\| PREF_CODEASSIST_AUTOACTIVATION_DELAY.equals(key))
	fContext.statusChanged(validatePositiveNumber(getValue(PREF_CODEASSIST_AUTOACTIVATION_DELAY)));
	}

	protected void setControlEnabled(Key key, boolean enabled) {
	Control control= getControl(key);
	control.setEnabled(enabled);
	Label label= fLabels.get(control);
	if (label != null)
	label.setEnabled(enabled);
	}

	private Control getControl(Key key) {
	for (int i= fComboBoxes.size() - 1; i >= 0; i--) {
	Control curr= fComboBoxes.get(i);
	ControlData data= (ControlData) curr.getData();
	if (key.equals(data.getKey())) {
	return curr;
	}
	}
	for (int i= fCheckBoxes.size() - 1; i >= 0; i--) {
	Control curr= fCheckBoxes.get(i);
	ControlData data= (ControlData) curr.getData();
	if (key.equals(data.getKey())) {
	return curr;
	}
	}
	for (int i= fTextBoxes.size() - 1; i >= 0; i--) {
	Control curr= fTextBoxes.get(i);
	Key currKey= (Key) curr.getData();
	if (key.equals(currKey)) {
	return curr;
	}
	}
	return null;
	}
	}