Facade Pattern 2 in Java
//[C] 2002 Sun Microsystems, Inc.---
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.Properties;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class RunFacadePattern {
public static void main(String [] arguments){
System.out.println("Example for the Facade pattern");
System.out.println();
System.out.println("This code sample uses an InternationalizatgionWizard (a Facade)");
System.out.println(" to manage communication between the rest of the application and");
System.out.println(" a series of other classes.");
System.out.println();
System.out.println("The InternationalizatgionWizard maintains a colleciton of Nation");
System.out.println(" objects. When the setNation method is called, the wizard sets the");
System.out.println(" default nation, updating the Currency, PhoneNumber and localized");
System.out.println(" String resources (InternationalizedText) available.");
System.out.println();
System.out.println("Calls to get Strings for the GUI, the currency symbol or the dialing");
System.out.println(" prefix are routed through the Facade, the InternationalizationWizard.");
System.out.println();
if (!(new File("data.ser").exists())){
DataCreator.serialize("data.ser");
}
System.out.println("Creating the InternationalizationWizard and setting the nation to US.");
System.out.println();
InternationalizationWizard wizard = new InternationalizationWizard();
wizard.setNation("US");
System.out.println("Creating the FacadeGui.");
System.out.println();
FacadeGui application = new FacadeGui(wizard);
application.createGui();
application.setNation(wizard.getNation("US"));
}
}
class FacadeGui implements ActionListener, ItemListener{
private static final String GUI_TITLE = "title";
private static final String EXIT_CAPTION = "exit";
private static final String COUNTRY_LABEL = "country";
private static final String CURRENCY_LABEL = "currency";
private static final String PHONE_LABEL = "phone";
private JFrame mainFrame;
private JButton exit;
private JComboBox countryChooser;
private JPanel controlPanel, displayPanel;
private JLabel countryLabel, currencyLabel, phoneLabel;
private JTextField currencyTextField, phoneTextField;
private InternationalizationWizard nationalityFacade;
public FacadeGui(InternationalizationWizard wizard){
nationalityFacade = wizard;
}
public void createGui(){
mainFrame = new JFrame(nationalityFacade.getProperty(GUI_TITLE));
Container content = mainFrame.getContentPane();
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
displayPanel = new JPanel();
displayPanel.setLayout(new GridLayout(3, 2));
countryLabel = new JLabel(nationalityFacade.getProperty(COUNTRY_LABEL));
countryChooser = new JComboBox(nationalityFacade.getNations());
currencyLabel = new JLabel(nationalityFacade.getProperty(CURRENCY_LABEL));
currencyTextField = new JTextField();
phoneLabel = new JLabel(nationalityFacade.getProperty(PHONE_LABEL));
phoneTextField = new JTextField();
currencyTextField.setEditable(false);
phoneTextField.setEditable(false);
displayPanel.add(countryLabel);
displayPanel.add(countryChooser);
displayPanel.add(currencyLabel);
displayPanel.add(currencyTextField);
displayPanel.add(phoneLabel);
displayPanel.add(phoneTextField);
content.add(displayPanel);
controlPanel = new JPanel();
exit = new JButton(nationalityFacade.getProperty(EXIT_CAPTION));
controlPanel.add(exit);
content.add(controlPanel);
exit.addActionListener(this);
countryChooser.addItemListener(this);
mainFrame.addWindowListener(new WindowCloseManager());
mainFrame.pack();
mainFrame.setVisible(true);
}
private void updateGui(){
nationalityFacade.setNation(countryChooser.getSelectedItem().toString());
mainFrame.setTitle(nationalityFacade.getProperty(GUI_TITLE));
countryLabel.setText(nationalityFacade.getProperty(COUNTRY_LABEL));
currencyLabel.setText(nationalityFacade.getProperty(CURRENCY_LABEL));
phoneLabel.setText(nationalityFacade.getProperty(PHONE_LABEL));
exit.setText(nationalityFacade.getProperty(EXIT_CAPTION));
currencyTextField.setText(nationalityFacade.getCurrencySymbol() + " " +
nationalityFacade.getNumberFormat().format(5280.50));
phoneTextField.setText(nationalityFacade.getPhonePrefix());
mainFrame.invalidate();
countryLabel.invalidate();
currencyLabel.invalidate();
phoneLabel.invalidate();
exit.invalidate();
mainFrame.validate();
}
public void actionPerformed(ActionEvent evt){
Object originator = evt.getSource();
if (originator == exit){
exitApplication();
}
}
public void itemStateChanged(ItemEvent evt){
Object originator = evt.getSource();
if (originator == countryChooser){
updateGui();
}
}
public void setNation(Nation nation){
countryChooser.setSelectedItem(nation);
}
private class WindowCloseManager extends WindowAdapter{
public void windowClosing(WindowEvent evt){
exitApplication();
}
}
private void exitApplication(){
System.exit(0);
}
}
class Nation {
private char symbol;
private String name;
private String dialingPrefix;
private String propertyFileName;
private NumberFormat numberFormat;
public Nation(String newName, char newSymbol, String newDialingPrefix,
String newPropertyFileName, NumberFormat newNumberFormat) {
name = newName;
symbol = newSymbol;
dialingPrefix = newDialingPrefix;
propertyFileName = newPropertyFileName;
numberFormat = newNumberFormat;
}
public String getName(){ return name; }
public char getSymbol(){ return symbol; }
public String getDialingPrefix(){ return dialingPrefix; }
public String getPropertyFileName(){ return propertyFileName; }
public NumberFormat getNumberFormat(){ return numberFormat; }
public String toString(){ return name; }
}
class Currency{
private char currencySymbol;
private NumberFormat numberFormat;
public void setCurrencySymbol(char newCurrencySymbol){ currencySymbol = newCurrencySymbol; }
public void setNumberFormat(NumberFormat newNumberFormat){ numberFormat = newNumberFormat; }
public char getCurrencySymbol(){ return currencySymbol; }
public NumberFormat getNumberFormat(){ return numberFormat; }
}
class DataCreator{
private static final String GUI_TITLE = "title";
private static final String EXIT_CAPTION = "exit";
private static final String COUNTRY_LABEL = "country";
private static final String CURRENCY_LABEL = "currency";
private static final String PHONE_LABEL = "phone";
public static void serialize(String fileName){
saveFrData();
saveUsData();
saveNlData();
}
private static void saveFrData(){
try{
Properties textSettings = new Properties();
textSettings.setProperty(GUI_TITLE, "Demonstration du Pattern Facade");
textSettings.setProperty(EXIT_CAPTION, "Sortir");
textSettings.setProperty(COUNTRY_LABEL, "Pays");
textSettings.setProperty(CURRENCY_LABEL, "Monnaie");
textSettings.setProperty(PHONE_LABEL, "Numero de Telephone");
textSettings.store(new FileOutputStream("french.properties"), "French Settings");
}
catch (IOException exc){
System.err.println("Error storing settings to output");
exc.printStackTrace();
}
}
private static void saveUsData(){
try{
Properties textSettings = new Properties();
textSettings.setProperty(GUI_TITLE, "Facade Pattern Demonstration");
textSettings.setProperty(EXIT_CAPTION, "Exit");
textSettings.setProperty(COUNTRY_LABEL, "Country");
textSettings.setProperty(CURRENCY_LABEL, "Currency");
textSettings.setProperty(PHONE_LABEL, "Phone Number");
textSettings.store(new FileOutputStream("us.properties"), "US Settings");
}
catch (IOException exc){
System.err.println("Error storing settings to output");
exc.printStackTrace();
}
}
private static void saveNlData(){
try{
Properties textSettings = new Properties();
textSettings.setProperty(GUI_TITLE, "Facade Pattern voorbeeld");
textSettings.setProperty(EXIT_CAPTION, "Exit");
textSettings.setProperty(COUNTRY_LABEL, "Land");
textSettings.setProperty(CURRENCY_LABEL, "Munt eenheid");
textSettings.setProperty(PHONE_LABEL, "Telefoonnummer");
textSettings.store(new FileOutputStream("dutch.properties"), "Dutch Settings");
}
catch (IOException exc){
System.err.println("Error storing settings to output");
exc.printStackTrace();
}
}
}
class PhoneNumber {
private static String selectedInterPrefix;
private String internationalPrefix;
private String areaNumber;
private String netNumber;
public PhoneNumber(String intPrefix, String areaNumber, String netNumber) {
this.internationalPrefix = intPrefix;
this.areaNumber = areaNumber;
this.netNumber = netNumber;
}
public String getInternationalPrefix(){ return internationalPrefix; }
public String getAreaNumber(){ return areaNumber; }
public String getNetNumber(){ return netNumber; }
public static String getSelectedInterPrefix(){ return selectedInterPrefix; }
public void setInternationalPrefix(String newPrefix){ internationalPrefix = newPrefix; }
public void setAreaNumber(String newAreaNumber){ areaNumber = newAreaNumber; }
public void setNetNumber(String newNetNumber){ netNumber = newNetNumber; }
public static void setSelectedInterPrefix(String prefix) { selectedInterPrefix = prefix; }
public String toString(){
return internationalPrefix + areaNumber + netNumber;
}
}
class InternationalizedText{
private static final String DEFAULT_FILE_NAME = "";
private Properties textProperties = new Properties();
public InternationalizedText(){
this(DEFAULT_FILE_NAME);
}
public InternationalizedText(String fileName){
loadProperties(fileName);
}
public void setFileName(String newFileName){
if (newFileName != null){
loadProperties(newFileName);
}
}
public String getProperty(String key){
return getProperty(key, "");
}
public String getProperty(String key, String defaultValue){
return textProperties.getProperty(key, defaultValue);
}
private void loadProperties(String fileName){
try{
FileInputStream input = new FileInputStream(fileName);
textProperties.load(input);
}
catch (IOException exc){
textProperties = new Properties();
}
}
}
class InternationalizationWizard{
private HashMap map;
private Currency currency = new Currency();
private InternationalizedText propertyFile = new InternationalizedText();
public InternationalizationWizard() {
map = new HashMap();
Nation[] nations = {
new Nation("US", '$', "+1", "us.properties", NumberFormat.getInstance(Locale.US)),
new Nation("The Netherlands", 'f', "+31", "dutch.properties", NumberFormat.getInstance(Locale.GERMANY)),
new Nation("France", 'f', "+33", "french.properties", NumberFormat.getInstance(Locale.FRANCE))
};
for (int i = 0; i < nations.length; i++) {
map.put(nations[i].getName(), nations[i]);
}
}
public void setNation(String name) {
Nation nation = (Nation)map.get(name);
if (nation != null) {
currency.setCurrencySymbol(nation.getSymbol());
currency.setNumberFormat(nation.getNumberFormat());
PhoneNumber.setSelectedInterPrefix(nation.getDialingPrefix());
propertyFile.setFileName(nation.getPropertyFileName());
}
}
public Object[] getNations(){
return map.values().toArray();
}
public Nation getNation(String name){
return (Nation)map.get(name);
}
public char getCurrencySymbol(){
return currency.getCurrencySymbol();
}
public NumberFormat getNumberFormat(){
return currency.getNumberFormat();
}
public String getPhonePrefix(){
return PhoneNumber.getSelectedInterPrefix();
}
public String getProperty(String key){
return propertyFile.getProperty(key);
}
public String getProperty(String key, String defaultValue){
return propertyFile.getProperty(key, defaultValue);
}
}
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