ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/preferences/AbstractAntEditorPreferencePage.java - platform/eclipse.platform - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2013 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
  *******************************************************************************/
 package org.eclipse.ant.internal.ui.preferences;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import com.ibm.icu.text.MessageFormat;

 import org.eclipse.ant.internal.ui.AntUIPlugin;

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 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.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;

 import org.eclipse.core.runtime.IStatus;

 import org.eclipse.jface.dialogs.DialogPage;
 import org.eclipse.jface.dialogs.IMessageProvider;
 import org.eclipse.jface.preference.PreferencePage;

 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.eclipse.ui.PlatformUI;

 public abstract class AbstractAntEditorPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

 	private OverlayPreferenceStore fOverlayStore;
 	protected List<IStatus> fStatusList;
 	private boolean fInitialized = false;

 	private Map<Button, String> fCheckBoxes = new HashMap<>();
 	private SelectionListener fCheckBoxListener = new SelectionListener() {
 		@Override
 		public void widgetDefaultSelected(SelectionEvent e) {
 			// do nothing
 		}

 		@Override
 		public void widgetSelected(SelectionEvent e) {
 			Button button = (Button) e.widget;
 			fOverlayStore.setValue(fCheckBoxes.get(button), button.getSelection());
 		}
 	};

 	private Map<Text, String> fTextFields = new HashMap<>();
 	private ModifyListener fTextFieldListener = new ModifyListener() {
 		@Override
 		public void modifyText(ModifyEvent e) {
 			if (fInitialized) {
 				Text text = (Text) e.widget;
 				fOverlayStore.setValue(fTextFields.get(text), text.getText());
 			}
 		}
 	};

 	private Map<Text, String[]> fNumberFields = new HashMap<>();
 	private ModifyListener fNumberFieldListener = new ModifyListener() {
 		@Override
 		public void modifyText(ModifyEvent e) {
 			if (fInitialized) {
 				numberFieldChanged((Text) e.widget);
 			}
 		}
 	};

 	public AbstractAntEditorPreferencePage() {
 		super();
 		setPreferenceStore(AntUIPlugin.getDefault().getPreferenceStore());
 		fOverlayStore = createOverlayStore();
 	}

 	protected abstract OverlayPreferenceStore createOverlayStore();

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench)
 	 */
 	@Override
 	public void init(IWorkbench workbench) {
 		// do nothing
 	}

 	/*
 	 * @see org.eclipse.jface.preference.PreferencePage#createControl(org.eclipse.swt.widgets.Composite)
 	 */
 	@Override
 	public void createControl(Composite parent) {
 		super.createControl(parent);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), getHelpContextId());
 	}

 	abstract protected String getHelpContextId();

 	protected void initializeFields() {
 		Map<Button, String> checkBoxes = getCheckBoxes();
 		Map<Text, String> textFields = getTextFields();
 		for (Button b : checkBoxes.keySet()) {
 			String key = checkBoxes.get(b);
 			b.setSelection(getOverlayStore().getBoolean(key));
 		}
 		for (Text t : textFields.keySet()) {
 			String key = textFields.get(t);
 			t.setText(getOverlayStore().getString(key));
 		}
 		fInitialized = true;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.preference.IPreferencePage#performOk()
 	 */
 	@SuppressWarnings("deprecation")
 	@Override
 	public boolean performOk() {
 		getOverlayStore().propagate();
 		AntUIPlugin.getDefault().savePluginPreferences();
 		return true;
 	}

 	protected OverlayPreferenceStore getOverlayStore() {
 		return fOverlayStore;
 	}

 	protected OverlayPreferenceStore setOverlayStore() {
 		return fOverlayStore;
 	}

 	protected Map<Button, String> getCheckBoxes() {
 		return fCheckBoxes;
 	}

 	protected Map<Text, String> getTextFields() {
 		return fTextFields;
 	}

 	protected Map<Text, String[]> getNumberFields() {
 		return fNumberFields;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.preference.PreferencePage#performDefaults()
 	 */
 	@Override
 	protected void performDefaults() {
 		getOverlayStore().loadDefaults();
 		initializeFields();
 		handleDefaults();
 		super.performDefaults();
 	}

 	protected abstract void handleDefaults();

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.dialogs.IDialogPage#dispose()
 	 */
 	@Override
 	public void dispose() {
 		if (getOverlayStore() != null) {
 			getOverlayStore().stop();
 			fOverlayStore = null;
 		}
 		super.dispose();
 	}

 	protected Button addCheckBox(Composite parent, String labelText, String key, int indentation) {
 		Button checkBox = new Button(parent, SWT.CHECK);
 		checkBox.setText(labelText);
 		checkBox.setFont(parent.getFont());

 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.horizontalIndent = indentation;
 		gd.horizontalSpan = 2;
 		checkBox.setLayoutData(gd);
 		checkBox.addSelectionListener(fCheckBoxListener);

 		getCheckBoxes().put(checkBox, key);

 		return checkBox;
 	}

 	protected Text addTextField(Composite composite, String labelText, String key, int textLimit, int indentation, String[] errorMessages) {
 		Font font = composite.getFont();

 		Label label = new Label(composite, SWT.NONE);
 		label.setText(labelText);
 		label.setFont(font);
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.horizontalIndent = indentation;
 		label.setLayoutData(gd);

 		Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE);
 		textControl.setFont(font);
 		gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
 		textControl.setLayoutData(gd);
 		textControl.setTextLimit(textLimit);
 		getTextFields().put(textControl, key);
 		if (errorMessages != null) {
 			getNumberFields().put(textControl, errorMessages);
 			textControl.addModifyListener(fNumberFieldListener);
 		} else {
 			textControl.addModifyListener(fTextFieldListener);
 		}

 		return textControl;
 	}

 	private void numberFieldChanged(Text textControl) {
 		String number = textControl.getText();
 		IStatus status = validatePositiveNumber(number, getNumberFields().get(textControl));
 		if (!status.matches(IStatus.ERROR)) {
 			getOverlayStore().setValue(getTextFields().get(textControl), number);
 		}
 		updateStatus(status);
 	}

 	private IStatus validatePositiveNumber(String number, String[] errorMessages) {
 		StatusInfo status = new StatusInfo();
 		if (number.length() == 0) {
 			status.setError(errorMessages[0]);
 		} else {
 			try {
 				int value = Integer.parseInt(number);
 				if (value < 0)
 					status.setError(MessageFormat.format(errorMessages[1], new Object[] { number }));
 			}
 			catch (NumberFormatException e) {
 				status.setError(MessageFormat.format(errorMessages[1], new Object[] { number }));
 			}
 		}
 		return status;
 	}

 	protected void updateStatus(IStatus status) {
 		if (!status.matches(IStatus.ERROR)) {
 			for (Text text : getNumberFields().keySet()) {
 				IStatus s = validatePositiveNumber(text.getText(), getNumberFields().get(text));
 				status = s.getSeverity() > status.getSeverity() ? s : status;
 			}
 		}

 		List<IStatus> statusList = getStatusList();
 		if (statusList != null) {
 			List<IStatus> temp = new ArrayList<>(statusList.size() + 1);
 			temp.add(status);
 			temp.addAll(statusList);
 			status = getMostSevere(temp);
 		}
 		setValid(!status.matches(IStatus.ERROR));
 		applyToStatusLine(this, status);
 	}

 	protected List<IStatus> getStatusList() {
 		return fStatusList;
 	}

 	/**
 	 * Finds the most severe status from an array of status. An error is more severe than a warning, and a warning is more severe than OK.
 	 */
 	private IStatus getMostSevere(List<IStatus> statusList) {
 		IStatus max = null;
 		for (int i = 0; i < statusList.size(); i++) {
 			IStatus curr = statusList.get(i);
 			if (curr.matches(IStatus.ERROR)) {
 				return curr;
 			}
 			if (max == null || curr.getSeverity() > max.getSeverity()) {
 				max = curr;
 			}
 		}
 		return max;
 	}

 	/*
 	 * Applies the status to the status line of a dialog page.
 	 */
 	private void applyToStatusLine(DialogPage page, IStatus status) {
 		String message = status.getMessage();
 		switch (status.getSeverity()) {
 			case IStatus.OK:
 				page.setMessage(message, IMessageProvider.NONE);
 				page.setErrorMessage(null);
 				break;
 			case IStatus.WARNING:
 				page.setMessage(message, IMessageProvider.WARNING);
 				page.setErrorMessage(null);
 				break;
 			case IStatus.INFO:
 				page.setMessage(message, IMessageProvider.INFORMATION);
 				page.setErrorMessage(null);
 				break;
 			default:
 				if (message.length() == 0) {
 					message = null;
 				}
 				page.setMessage(null);
 				page.setErrorMessage(message);
 				break;
 		}
 	}

 	/**
 	 * Returns an array of size 2: - first element is of type <code>Label</code> - second element is of type <code>Text</code> Use
 	 * <code>getLabelControl</code> and <code>getTextControl</code> to get the 2 controls.
 	 */
 	protected Control[] addLabelledTextField(Composite composite, String label, String key, int textLimit, int indentation, String[] errorMessages) {
 		Label labelControl = new Label(composite, SWT.NONE);
 		labelControl.setText(label);
 		labelControl.setFont(composite.getFont());
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.horizontalIndent = indentation;
 		labelControl.setLayoutData(gd);

 		Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE);
 		gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		if (textLimit > -1) {
 			gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
 			textControl.setTextLimit(textLimit);
 		} else {
 			gd.widthHint = convertWidthInCharsToPixels(50);
 		}
 		textControl.setLayoutData(gd);
 		textControl.setFont(composite.getFont());
 		fTextFields.put(textControl, key);
 		if (errorMessages != null) {
 			fNumberFields.put(textControl, errorMessages);
 			textControl.addModifyListener(fNumberFieldListener);
 		} else {
 			textControl.addModifyListener(fTextFieldListener);
 		}

 		return new Control[] { labelControl, textControl };
 	}

 	protected String loadPreviewContentFromFile(String filename) {
 		String line;
 		String separator = System.getProperty("line.separator"); //$NON-NLS-1$
 		StringBuilder buffer = new StringBuilder(512);
 		BufferedReader reader = null;
 		try {
 			reader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(filename)));
 			while ((line = reader.readLine()) != null) {
 				buffer.append(line);
 				buffer.append(separator);
 			}
 		}
 		catch (IOException io) {
 			AntUIPlugin.log(io);
 		}
 		finally {
 			if (reader != null) {
 				try {
 					reader.close();
 				}
 				catch (IOException e) {
 					// do nothing
 				}
 			}
 		}
 		return buffer.toString();
 	}

 	protected Label getLabelControl(Control[] labelledTextField) {
 		return (Label) labelledTextField[0];
 	}

 	protected Text getTextControl(Control[] labelledTextField) {
 		return (Text) labelledTextField[1];
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2013 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
	*******************************************************************************/
	package org.eclipse.ant.internal.ui.preferences;

	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	import com.ibm.icu.text.MessageFormat;

	import org.eclipse.ant.internal.ui.AntUIPlugin;

	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	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.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;

	import org.eclipse.core.runtime.IStatus;

	import org.eclipse.jface.dialogs.DialogPage;
	import org.eclipse.jface.dialogs.IMessageProvider;
	import org.eclipse.jface.preference.PreferencePage;

	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;
	import org.eclipse.ui.PlatformUI;

	public abstract class AbstractAntEditorPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

	private OverlayPreferenceStore fOverlayStore;
	protected List<IStatus> fStatusList;
	private boolean fInitialized = false;

	private Map<Button, String> fCheckBoxes = new HashMap<>();
	private SelectionListener fCheckBoxListener = new SelectionListener() {
	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	// do nothing
	}

	@Override
	public void widgetSelected(SelectionEvent e) {
	Button button = (Button) e.widget;
	fOverlayStore.setValue(fCheckBoxes.get(button), button.getSelection());
	}
	};

	private Map<Text, String> fTextFields = new HashMap<>();
	private ModifyListener fTextFieldListener = new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	if (fInitialized) {
	Text text = (Text) e.widget;
	fOverlayStore.setValue(fTextFields.get(text), text.getText());
	}
	}
	};

	private Map<Text, String[]> fNumberFields = new HashMap<>();
	private ModifyListener fNumberFieldListener = new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	if (fInitialized) {
	numberFieldChanged((Text) e.widget);
	}
	}
	};

	public AbstractAntEditorPreferencePage() {
	super();
	setPreferenceStore(AntUIPlugin.getDefault().getPreferenceStore());
	fOverlayStore = createOverlayStore();
	}

	protected abstract OverlayPreferenceStore createOverlayStore();

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench)
	*/
	@Override
	public void init(IWorkbench workbench) {
	// do nothing
	}

	/*
	* @see org.eclipse.jface.preference.PreferencePage#createControl(org.eclipse.swt.widgets.Composite)
	*/
	@Override
	public void createControl(Composite parent) {
	super.createControl(parent);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), getHelpContextId());
	}

	abstract protected String getHelpContextId();

	protected void initializeFields() {
	Map<Button, String> checkBoxes = getCheckBoxes();
	Map<Text, String> textFields = getTextFields();
	for (Button b : checkBoxes.keySet()) {
	String key = checkBoxes.get(b);
	b.setSelection(getOverlayStore().getBoolean(key));
	}
	for (Text t : textFields.keySet()) {
	String key = textFields.get(t);
	t.setText(getOverlayStore().getString(key));
	}
	fInitialized = true;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.preference.IPreferencePage#performOk()
	*/
	@SuppressWarnings("deprecation")
	@Override
	public boolean performOk() {
	getOverlayStore().propagate();
	AntUIPlugin.getDefault().savePluginPreferences();
	return true;
	}

	protected OverlayPreferenceStore getOverlayStore() {
	return fOverlayStore;
	}

	protected OverlayPreferenceStore setOverlayStore() {
	return fOverlayStore;
	}

	protected Map<Button, String> getCheckBoxes() {
	return fCheckBoxes;
	}

	protected Map<Text, String> getTextFields() {
	return fTextFields;
	}

	protected Map<Text, String[]> getNumberFields() {
	return fNumberFields;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.preference.PreferencePage#performDefaults()
	*/
	@Override
	protected void performDefaults() {
	getOverlayStore().loadDefaults();
	initializeFields();
	handleDefaults();
	super.performDefaults();
	}

	protected abstract void handleDefaults();

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.dialogs.IDialogPage#dispose()
	*/
	@Override
	public void dispose() {
	if (getOverlayStore() != null) {
	getOverlayStore().stop();
	fOverlayStore = null;
	}
	super.dispose();
	}

	protected Button addCheckBox(Composite parent, String labelText, String key, int indentation) {
	Button checkBox = new Button(parent, SWT.CHECK);
	checkBox.setText(labelText);
	checkBox.setFont(parent.getFont());

	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.horizontalIndent = indentation;
	gd.horizontalSpan = 2;
	checkBox.setLayoutData(gd);
	checkBox.addSelectionListener(fCheckBoxListener);

	getCheckBoxes().put(checkBox, key);

	return checkBox;
	}

	protected Text addTextField(Composite composite, String labelText, String key, int textLimit, int indentation, String[] errorMessages) {
	Font font = composite.getFont();

	Label label = new Label(composite, SWT.NONE);
	label.setText(labelText);
	label.setFont(font);
	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.horizontalIndent = indentation;
	label.setLayoutData(gd);

	Text textControl = new Text(composite, SWT.BORDER \| SWT.SINGLE);
	textControl.setFont(font);
	gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
	textControl.setLayoutData(gd);
	textControl.setTextLimit(textLimit);
	getTextFields().put(textControl, key);
	if (errorMessages != null) {
	getNumberFields().put(textControl, errorMessages);
	textControl.addModifyListener(fNumberFieldListener);
	} else {
	textControl.addModifyListener(fTextFieldListener);
	}

	return textControl;
	}

	private void numberFieldChanged(Text textControl) {
	String number = textControl.getText();
	IStatus status = validatePositiveNumber(number, getNumberFields().get(textControl));
	if (!status.matches(IStatus.ERROR)) {
	getOverlayStore().setValue(getTextFields().get(textControl), number);
	}
	updateStatus(status);
	}

	private IStatus validatePositiveNumber(String number, String[] errorMessages) {
	StatusInfo status = new StatusInfo();
	if (number.length() == 0) {
	status.setError(errorMessages[0]);
	} else {
	try {
	int value = Integer.parseInt(number);
	if (value < 0)
	status.setError(MessageFormat.format(errorMessages[1], new Object[] { number }));
	}
	catch (NumberFormatException e) {
	status.setError(MessageFormat.format(errorMessages[1], new Object[] { number }));
	}
	}
	return status;
	}

	protected void updateStatus(IStatus status) {
	if (!status.matches(IStatus.ERROR)) {
	for (Text text : getNumberFields().keySet()) {
	IStatus s = validatePositiveNumber(text.getText(), getNumberFields().get(text));
	status = s.getSeverity() > status.getSeverity() ? s : status;
	}
	}

	List<IStatus> statusList = getStatusList();
	if (statusList != null) {
	List<IStatus> temp = new ArrayList<>(statusList.size() + 1);
	temp.add(status);
	temp.addAll(statusList);
	status = getMostSevere(temp);
	}
	setValid(!status.matches(IStatus.ERROR));
	applyToStatusLine(this, status);
	}

	protected List<IStatus> getStatusList() {
	return fStatusList;
	}

	/**
	* Finds the most severe status from an array of status. An error is more severe than a warning, and a warning is more severe than OK.
	*/
	private IStatus getMostSevere(List<IStatus> statusList) {
	IStatus max = null;
	for (int i = 0; i < statusList.size(); i++) {
	IStatus curr = statusList.get(i);
	if (curr.matches(IStatus.ERROR)) {
	return curr;
	}
	if (max == null \|\| curr.getSeverity() > max.getSeverity()) {
	max = curr;
	}
	}
	return max;
	}

	/*
	* Applies the status to the status line of a dialog page.
	*/
	private void applyToStatusLine(DialogPage page, IStatus status) {
	String message = status.getMessage();
	switch (status.getSeverity()) {
	case IStatus.OK:
	page.setMessage(message, IMessageProvider.NONE);
	page.setErrorMessage(null);
	break;
	case IStatus.WARNING:
	page.setMessage(message, IMessageProvider.WARNING);
	page.setErrorMessage(null);
	break;
	case IStatus.INFO:
	page.setMessage(message, IMessageProvider.INFORMATION);
	page.setErrorMessage(null);
	break;
	default:
	if (message.length() == 0) {
	message = null;
	}
	page.setMessage(null);
	page.setErrorMessage(message);
	break;
	}
	}

	/**
	* Returns an array of size 2: - first element is of type <code>Label</code> - second element is of type <code>Text</code> Use
	* <code>getLabelControl</code> and <code>getTextControl</code> to get the 2 controls.
	*/
	protected Control[] addLabelledTextField(Composite composite, String label, String key, int textLimit, int indentation, String[] errorMessages) {
	Label labelControl = new Label(composite, SWT.NONE);
	labelControl.setText(label);
	labelControl.setFont(composite.getFont());
	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.horizontalIndent = indentation;
	labelControl.setLayoutData(gd);

	Text textControl = new Text(composite, SWT.BORDER \| SWT.SINGLE);
	gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	if (textLimit > -1) {
	gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
	textControl.setTextLimit(textLimit);
	} else {
	gd.widthHint = convertWidthInCharsToPixels(50);
	}
	textControl.setLayoutData(gd);
	textControl.setFont(composite.getFont());
	fTextFields.put(textControl, key);
	if (errorMessages != null) {
	fNumberFields.put(textControl, errorMessages);
	textControl.addModifyListener(fNumberFieldListener);
	} else {
	textControl.addModifyListener(fTextFieldListener);
	}

	return new Control[] { labelControl, textControl };
	}

	protected String loadPreviewContentFromFile(String filename) {
	String line;
	String separator = System.getProperty("line.separator"); //$NON-NLS-1$
	StringBuilder buffer = new StringBuilder(512);
	BufferedReader reader = null;
	try {
	reader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(filename)));
	while ((line = reader.readLine()) != null) {
	buffer.append(line);
	buffer.append(separator);
	}
	}
	catch (IOException io) {
	AntUIPlugin.log(io);
	}
	finally {
	if (reader != null) {
	try {
	reader.close();
	}
	catch (IOException e) {
	// do nothing
	}
	}
	}
	return buffer.toString();
	}

	protected Label getLabelControl(Control[] labelledTextField) {
	return (Label) labelledTextField[0];
	}

	protected Text getTextControl(Control[] labelledTextField) {
	return (Text) labelledTextField[1];
	}
	}