/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */


package org.netbeans.modules.i18n.wizard;


import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dialog;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.Insets;
import java.util.ArrayList;
import java.util.EventObject;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.HashSet;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellEditor;
import javax.swing.AbstractCellEditor;
import org.netbeans.api.java.classpath.ClassPath;

import org.netbeans.modules.i18n.HardCodedString;
import org.netbeans.modules.i18n.I18nString;
import org.netbeans.modules.i18n.I18nSupport;
import org.netbeans.modules.i18n.I18nUtil;
import org.netbeans.modules.i18n.PropertyPanel;

import org.openide.DialogDescriptor;
import org.openide.loaders.DataObject;
import org.openide.util.HelpCtx;
import org.openide.util.NbBundle;
import org.openide.WizardDescriptor;
import org.openide.DialogDisplayer;


/**
 * WizardDescriptor.Panel used for to show found hard coded strings
 * for sepcified sources. It offers default key-value pairs and allows modify them.
 * These values will be used by actual i18n-zation of those sources.
 * It is the fourth and last panel of I18N Wizard.
 *
 * @author  Peter Zavadsky
 * @see Panel
 */
final class HardStringWizardPanel extends JPanel {

    /** Column index of check box column. */
    private static final int COLUMN_INDEX_CHECK = 0;
    /** Column index of hard string column. */
    private static final int COLUMN_INDEX_HARDSTRING = 1;
    /** Column index of key column. */
    private static final int COLUMN_INDEX_KEY = 2;
    /** Column index of value column. */
    private static final int COLUMN_INDEX_VALUE = 3;
    /** Column index of custom column. */
    private static final int COLUMN_INDEX_CUSTOM = 4;
        
    /** Local copy of i18n wizard data. */
    private final Map sourceMap = Util.createWizardSourceMap();

    /** Table model for stringTable. */
    private final AbstractTableModel tableModel = new HardCodedStringTableModel();
    
    
    /** Creates new form HardCodedStringsPanel */
    private HardStringWizardPanel() {
        initComponents();
        
        postInitComponents();
        
        initTable();

        setComboModel(sourceMap);
        
        initAccessibility();
    }

    
    /** Sets combo model only for source which were some found strings in. */
    private void setComboModel(Map sourceMap) {
        Object[] sources = sourceMap.keySet().toArray();
        
        ArrayList nonEmptySources = new ArrayList();
        
        for(int i = 0; i < sources.length; i++) {
            if(!((SourceData)sourceMap.get(sources[i])).getStringMap().isEmpty())
                nonEmptySources.add(sources[i]);
        }
        
        sourceCombo.setModel(new DefaultComboBoxModel(nonEmptySources.toArray()));
    }
    
    /** Adds additional init of components. */
    private void postInitComponents() {
        sourceLabel.setLabelFor(sourceCombo);
        sourceLabel.setDisplayedMnemonic(Util.getString("LBL_Source_Mnem").charAt(0));
        hardStringLabel.setLabelFor(hardStringTable);
        hardStringLabel.setDisplayedMnemonic(Util.getString("LBL_FoundStrings_Mnem").charAt(0));
    }

    /** Getter for resources property. */
    public Map getSourceMap() {
        return sourceMap;
    } 
    
    /** Setter for resources property. */
    public void setSourceMap(Map sourceMap) {
        this.sourceMap.clear();
        this.sourceMap.putAll(sourceMap);

        setComboModel(sourceMap);
    }
    
    
    /** Gets string map for specified source data object. Utility method. */
    private Map getStringMap() {
        SourceData sourceData = (SourceData)sourceMap.get(sourceCombo.getSelectedItem());
        return sourceData == null ? null : sourceData.getStringMap();
    }
    
    /** Gets hard coded strings user wish to not proceed. */
    private Set getRemovedStrings() {
        SourceData sourceData = (SourceData)sourceMap.get(sourceCombo.getSelectedItem());
        if(sourceData == null)
            return null;
        
        if(sourceData.getRemovedStrings() == null)
            sourceData.setRemovedStrings(new HashSet());
        
        return sourceData.getRemovedStrings();                    
    }

    /** Inits table component. */
    private void initTable() {
        hardStringTable.setDefaultRenderer(HardCodedString.class, new DefaultTableCellRenderer() {
            public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
                    
                JLabel label = (JLabel)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

                HardCodedString hcString = (HardCodedString)value;

                if(hcString != null)
                    label.setText(hcString.getText());
                else
                    label.setText(""); // NOI18N

                return label;
            }
        });
        
        hardStringTable.setDefaultRenderer(I18nString.class, new DefaultTableCellRenderer() {
            private final JButton dotButton = new JButton("...");               // NOI18N
            
            public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {

                I18nString i18nString = (I18nString)value;
                
                int modelColumn = hardStringTable.convertColumnIndexToModel(column);

                if(modelColumn == COLUMN_INDEX_CUSTOM)
                    return dotButton;
                    
                JLabel label = (JLabel)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

                if(i18nString != null) {
                    if(modelColumn == COLUMN_INDEX_KEY) {
                        label.setText(i18nString.getKey());
                    } else {
                        label.setText(i18nString.getValue());
                    }

                } else
                    label.setText(""); // NOI18N
                    
                
                return label;
            }
        });

        hardStringTable.setDefaultEditor(I18nString.class, new DefaultCellEditor(new JTextField()) {
            
            public Component getTableCellEditorComponent(
                JTable table, Object value,
                boolean isSelected,
                int row, int column) {

                I18nString i18nString = (I18nString)value;
                
                int modelColumn = hardStringTable.convertColumnIndexToModel(column);
                
                if(modelColumn == COLUMN_INDEX_KEY)
                    value = i18nString == null ? "" : i18nString.getKey(); // NOI18N
                else if(modelColumn == COLUMN_INDEX_VALUE)
                    value = i18nString == null ? "" : i18nString.getValue(); // NOI18N
                else
                    value = ""; // NOI18N
                
                return super.getTableCellEditorComponent(table, value, isSelected, row, column);
            }
        });
        
        hardStringTable.getColumnModel().getColumn(COLUMN_INDEX_CUSTOM).setCellEditor(new CustomizeCellEditor());

        // PENDING: Setting the size of columns with check box and  customize button editor.
        hardStringTable.getColumnModel().getColumn(COLUMN_INDEX_CHECK).setMaxWidth(30);
        hardStringTable.getColumnModel().getColumn(COLUMN_INDEX_CUSTOM).setMaxWidth(30);
    }
    
    private void initAccessibility() {        
        sourceCombo.getAccessibleContext().setAccessibleDescription(NbBundle.getBundle(HardStringWizardPanel.class).getString("ACSD_sourceCombo"));
        hardStringTable.getAccessibleContext().setAccessibleDescription(NbBundle.getBundle(HardStringWizardPanel.class).getString("ACSD_hardStringTable"));
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {//GEN-BEGIN:initComponents
        java.awt.GridBagConstraints gridBagConstraints;

        sourceLabel = new javax.swing.JLabel();
        sourceCombo = new javax.swing.JComboBox();
        hardStringLabel = new javax.swing.JLabel();
        scrollPane = new javax.swing.JScrollPane();
        hardStringTable = new javax.swing.JTable();

        setLayout(new java.awt.GridBagLayout());

        sourceLabel.setText(NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_Source"));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        add(sourceLabel, gridBagConstraints);

        sourceCombo.setRenderer(new SourceWizardPanel.DataObjectListCellRenderer());
        sourceCombo.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sourceComboActionPerformed(evt);
            }
        });

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(5, 0, 0, 0);
        add(sourceCombo, gridBagConstraints);

        hardStringLabel.setText(NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_FoundStrings"));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 2;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        gridBagConstraints.insets = new java.awt.Insets(11, 0, 0, 0);
        add(hardStringLabel, gridBagConstraints);

        scrollPane.setPreferredSize(new java.awt.Dimension(100, 100));
        hardStringTable.setModel(tableModel);
        scrollPane.setViewportView(hardStringTable);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 3;
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(5, 0, 0, 0);
        add(scrollPane, gridBagConstraints);

    }//GEN-END:initComponents

    private void sourceComboActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_sourceComboActionPerformed
        if(((SourceData)sourceMap.get(sourceCombo.getSelectedItem())).getStringMap().isEmpty()) {
            // There are no hardcoded strings found for this selected source.
            JLabel label = new JLabel(NbBundle.getBundle(HardStringWizardPanel.class).getString("TXT_NoHardstringsSource"));
            label.setHorizontalAlignment(JLabel.CENTER);
            scrollPane.setViewportView(label);
        } else {
            scrollPane.setViewportView(hardStringTable);
            tableModel.fireTableDataChanged();
        }
    }//GEN-LAST:event_sourceComboActionPerformed

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel hardStringLabel;
    private javax.swing.JTable hardStringTable;
    private javax.swing.JScrollPane scrollPane;
    private javax.swing.JComboBox sourceCombo;
    private javax.swing.JLabel sourceLabel;
    // End of variables declaration//GEN-END:variables

    /** Table model for this class. */
    private class HardCodedStringTableModel extends AbstractTableModel {
        
        /** Constructor. */
        public HardCodedStringTableModel() {
        }
        
        
        /** Implements superclass abstract method. */
        public int getColumnCount() {
            return 5;
        }
        
        /** Implemenst superclass abstract method. */
        public int getRowCount() {
            Map stringMap = getStringMap();
            return stringMap == null ? 0 : stringMap.size();
        }
        
        /** Implements superclass abstract method. */
        public Object getValueAt(int rowIndex, int columnIndex) {
            Map stringMap = getStringMap();
            
            if(stringMap == null)
                return null;
            
            if(columnIndex == COLUMN_INDEX_CHECK) {
                return !getRemovedStrings().contains(stringMap.keySet().toArray()[rowIndex]) ? Boolean.TRUE : Boolean.FALSE;
            } else if(columnIndex == COLUMN_INDEX_HARDSTRING) {
                return stringMap.keySet().toArray()[rowIndex];
            } else {
                return stringMap.values().toArray()[rowIndex];
            }
        }
        
        /** Overrides superclass method.
         * @ return true for all columns but first */
        public boolean isCellEditable(int rowIndex, int columnIndex) {
            if(columnIndex != COLUMN_INDEX_HARDSTRING)
                return true;
            else
                return false;
        }
        
        /** Overrides superclass method. */
        public void setValueAt(Object value, int rowIndex, int columnIndex) {
            if(columnIndex == COLUMN_INDEX_HARDSTRING)
                return;

            Map stringMap = getStringMap();
            
            if(stringMap == null)
                return;
            
            if(columnIndex == COLUMN_INDEX_CHECK && value instanceof Boolean) {
                Object hardString = stringMap.keySet().toArray()[rowIndex];
                
                Set removedStrings = getRemovedStrings();
                
                if(((Boolean)value).booleanValue())
                    removedStrings.remove(hardString);
                else
                    removedStrings.add(hardString);
            }
                
            I18nString i18nString = (I18nString)stringMap.values().toArray()[rowIndex];

            if(columnIndex == COLUMN_INDEX_KEY)
                i18nString.setKey(value.toString());
            else if(columnIndex == COLUMN_INDEX_VALUE)
                i18nString.setValue(value.toString());
        }
        
        /** Overrides superclass method. 
         * @return DataObject.class */
        public Class getColumnClass(int columnIndex) {
            if(columnIndex == COLUMN_INDEX_CHECK)
                return Boolean.class;
            else if(columnIndex == COLUMN_INDEX_HARDSTRING)
                return HardCodedString.class;
            else
                return I18nString.class;
        }

        /** Overrides superclass method. */
        public String getColumnName(int column) {
            if(column == COLUMN_INDEX_HARDSTRING)
                return NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_HardString");
            else if(column == COLUMN_INDEX_KEY)
                return NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_Key");
            else if(column == COLUMN_INDEX_VALUE)
                return NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_Value");
            else 
                return " "; // NOI18N
        }
    } // End of ResourceTableModel nested class.


    /** Cell editor for the right most 'customize' column. It shows dialog 
     * constructed from PropertyPanel which provides actual custmization of the 
     * I18nString instance.
     * @see org.netbeans.modules.i18n.PropertyPanel
     */
    public static class CustomizeCellEditor extends AbstractCellEditor 
    implements TableCellEditor, ActionListener {

        /** I18nString instance to be edited by this editor. */
        private I18nString i18nString;
        
        /** Editor component, in our case JButton. */
        private JButton editorComponent;

        
        /** Constructor. */
        public CustomizeCellEditor() {
            editorComponent = new JButton("..."); // NOI18N
            
            editorComponent.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    PropertyPanel panel = i18nString.getSupport().getPropertyPanel();
                    I18nString clone = (I18nString) i18nString.clone();
                    panel.setI18nString(clone);

                    String title = Util.getString("PROP_cust_dialog_name");
                    DialogDescriptor dd = new DialogDescriptor(panel, title);
                    dd.setModal(true);
                    dd.setOptionType(DialogDescriptor.DEFAULT_OPTION);
                    
                    Object options[] =  new Object[] {
                        DialogDescriptor.OK_OPTION,
                        DialogDescriptor.CANCEL_OPTION,
                    };                    
                    dd.setOptions(options);
                    //dd.setAdditionalOptions(new Object[0]);
                    dd.setHelpCtx(new HelpCtx(I18nUtil.PE_I18N_STRING_HELP_ID));
                    dd.setButtonListener(CustomizeCellEditor.this);

                    Dialog dialog = DialogDisplayer.getDefault().createDialog(dd);
                    dialog.setVisible(true);
                    if (dd.getValue() == DialogDescriptor.OK_OPTION) {
                        i18nString.become(clone);
                    }
                }
            });
        }

        /** Implements TableCellEditor interface. */
        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
            i18nString = (I18nString)value;
            
            return editorComponent;
        }
        
        /** Implements TableCellEditor interface. */
        public Object getCellEditorValue() {
            return i18nString;
        }

        /** Implements TableCellEditor interface. */
        public boolean isCellEditable(EventObject anEvent) { 
            if(anEvent instanceof MouseEvent) { 
                // Counts needed to start editing.
                return ((MouseEvent)anEvent).getClickCount() >= 1;
            }
            return true;
        }

        /** Implements TableCellEditor interface. */
        public boolean shouldSelectCell(EventObject anEvent) { 
            return true; 
        }

        /** Implements TableCellEditor interface. */
        public boolean stopCellEditing() {
            fireEditingStopped(); 
            return true;
        }

        /** Implements TableCellEditor interface. */
        public void cancelCellEditing() {
           fireEditingCanceled(); 
        }
        
        /** Implements ActionListener interface. */
        public void actionPerformed(ActionEvent evt) {
            stopCellEditing();
        }

    }
    
    
    /** WizardDescriptor.Panel used for HardCodedStringPanel. 
     * @see I18nWizardDescriptorPanel
     * @see org.openide.WizardDescriptor.Panel*/
    public static class Panel extends I18nWizardDescriptor.Panel 
    implements WizardDescriptor.FinishPanel, I18nWizardDescriptor.ProgressMonitor {

        /** Empty label component. */
        private final JLabel emptyLabel;
        
        /** HardString panel component cache. */
        private transient HardStringWizardPanel hardStringPanel;
                
        public Panel() {
            emptyLabel = new JLabel(NbBundle.getBundle(HardStringWizardPanel.class).getString("TXT_NoHardstrings"));
            emptyLabel.setHorizontalAlignment(JLabel.CENTER);
            emptyLabel.setVerticalAlignment(JLabel.CENTER);
        }


        /** Gets component to display. Implements superclass abstract method. 
         * @return this instance */
        protected Component createComponent() {
            JPanel panel = new JPanel();
            
            panel.getAccessibleContext().setAccessibleDescription(NbBundle.getBundle(HardStringWizardPanel.class).getString("ACS_HardStringWizardPanel"));            
            
            Integer index;
            
            if(I18nUtil.getOptions().isAdvancedWizard())
                index = new Integer(3);
            else
                index = new Integer(2);
            
            panel.putClientProperty("WizardPanel_contentSelectedIndex", index); // NOI18N
            panel.setName(NbBundle.getBundle(HardStringWizardPanel.class).getString("TXT_ModifyStrings"));
            panel.setPreferredSize(I18nWizardDescriptor.PREFERRED_DIMENSION);        
            panel.setLayout(new GridBagLayout());
            GridBagConstraints constraints = new GridBagConstraints();
            constraints.weightx = 1.0;
            constraints.weighty = 1.0;
            constraints.fill = GridBagConstraints.BOTH;
            panel.add(getUI(), constraints);
            
            return panel;
        }

        /** Gets if panel is valid. Overrides superclass method. */
        public boolean isValid() {
            return true;
        }
        
        /** Reads settings at the start when the panel comes to play. Overrides superclass method. */
        public void readSettings(Object settings) {
	    super.readSettings(settings);
            getUI().setSourceMap(getMap());

            JPanel panel = (JPanel)getComponent();
            if(foundStrings(getMap())) {
                if(panel.isAncestorOf(emptyLabel)) {
                    panel.remove(emptyLabel);
                    GridBagConstraints constraints = new GridBagConstraints();
                    constraints.weightx = 1.0;
                    constraints.weighty = 1.0;
                    constraints.fill = GridBagConstraints.BOTH;
                    panel.add(getUI(), constraints);
                }
            } else {
                if(panel.isAncestorOf(getUI())) {
                    panel.remove(getUI());
                    GridBagConstraints constraints = new GridBagConstraints();
                    constraints.weightx = 1.0;
                    constraints.weighty = 1.0;
                    constraints.fill = GridBagConstraints.BOTH;
                    panel.add(emptyLabel, constraints);
                }
            }
        }

        /** Stores settings at the end of panel show. Overrides superclass method. */
        public void storeSettings(Object settings) {
	    super.storeSettings(settings);
            // Update sources.
	    getMap().clear();
            getMap().putAll(getUI().getSourceMap());
        }
        
        /** Searches hard coded strings in sources and puts found hard coded string - i18n string pairs
         * into settings. Implements ProgressMonitor interface method. */
        public void doLongTimeChanges() {
            // do this only if there's anything to do
            if (foundStrings(getMap())) {       
                // Replace panel.
                final ProgressWizardPanel progressPanel = new ProgressWizardPanel(true);
                progressPanel.setMainText(NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_Internationalizing"));
                progressPanel.setMainProgress(0);

                ((Container)getComponent()).remove(getUI());
                GridBagConstraints constraints = new GridBagConstraints();
                constraints.weightx = 1.0;
                constraints.weighty = 1.0;
                constraints.fill = GridBagConstraints.BOTH;
                ((Container)getComponent()).add(progressPanel, constraints);
                ((JComponent)getComponent()).revalidate();
                getComponent().repaint();

                // Do replacement job here.
                Map sourceMap = getUI().getSourceMap();

                Iterator sourceIterator = sourceMap.keySet().iterator();

                // For each source perform the task.
                for(int i=0; sourceIterator.hasNext(); i++) {
                    Object source = sourceIterator.next();

                    // Get source data.
                    SourceData sourceData = (SourceData)sourceMap.get(source);

                    // Get i18n support for this source.
                    I18nSupport support = sourceData.getSupport();

                    // Get string map.
                    Map stringMap = sourceData.getStringMap();

                    // Get removed strings.
                    Set removed = sourceData.getRemovedStrings();

                    // Do actual replacement.
                    Iterator it = stringMap.keySet().iterator();

                    ClassPath cp = ClassPath.getClassPath( ((DataObject)source).getPrimaryFile(), ClassPath.SOURCE );
                    progressPanel.setSubText(NbBundle.getBundle(HardStringWizardPanel.class).getString("LBL_Source")+" "+cp.getResourceName( ((DataObject)source).getPrimaryFile(), '.', false ) );

                    for(int j=0; it.hasNext(); j++) {
                        HardCodedString hcString = (HardCodedString)it.next();
                        I18nString i18nString = (I18nString)stringMap.get(hcString);

                        if(removed != null && removed.contains(hcString))
                            // Don't proceed.
                            continue;

                        // Put new property into bundle.
                        support.getResourceHolder().addProperty(i18nString.getKey(), i18nString.getValue(), i18nString.getComment());

                        // Replace string in source.
                        support.getReplacer().replace(hcString, i18nString);

                        progressPanel.setSubProgress((int)((j+1)/(float)stringMap.size() * 100));
                    } // End of inner for.

                    // Provide additional changes if there are some.
                    if(support.hasAdditionalCustomizer()) {
                        support.performAdditionalChanges();
                    }

                    progressPanel.setMainProgress((int)((i+1)/(float)sourceMap.size() * 100));
                } // End of outer for.
            } // if (foundStrings(getMap()))
        }
        
        /** Implements ProgressMonitor interface method. Does nothing. */
        public void reset() {}
        
        /** Indicates if there were found some hardcoded strings in any of selected sources. 
         * @return true if at least one hard coded string was found. */
        private static boolean foundStrings(Map sourceMap) {
            Iterator it = sourceMap.keySet().iterator();

            while(it.hasNext()) {
                SourceData sourceData = (SourceData)sourceMap.get(it.next());
                if(!sourceData.getStringMap().isEmpty())
                    return true;
            }

            return false;
        }
        
        /** Gets help. Implements superclass abstract method. */
        public HelpCtx getHelp() {
            return new HelpCtx(I18nUtil.HELP_ID_WIZARD);
        }

        private synchronized HardStringWizardPanel getUI() {
            if (hardStringPanel == null) {
                hardStringPanel = new HardStringWizardPanel();
            }
            return hardStringPanel;
        }
        
    } // End of nested Panel class.
}