Java/Design Pattern/Adapter Pattern
Adapter Pattern - Example
<source lang="java">
/* Software Architecture Design Patterns in Java by Partha Kuchana Auerbach Publications
- /
import java.awt.BorderLayout; import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingUtilities; import javax.swing.UIManager; import com.sun.java.swing.plaf.windows.WindowsLookAndFeel; public class AddressManager extends JFrame {
public static final String newline = "\n";
public static final String VALIDATE = "Validate";
public static final String EXIT = "Exit";
private JTextField txtCustomerName, txtAddress, txtZip, txtState;
private JLabel lblCustomerName, lblAddress;
private JLabel lblZip, lblState, lblType;
private JComboBox cmbAddressType;
private JLabel lblResult, lblResultValue;
public AddressManager() {
super(" Adapter Pattern - Example ");
txtCustomerName = new JTextField(20);
txtAddress = new JTextField(20);
txtZip = new JTextField(10);
txtState = new JTextField(10);
cmbAddressType = new JComboBox();
cmbAddressType.addItem(Customer.US);
cmbAddressType.addItem(Customer.CANADA);
lblCustomerName = new JLabel("Customer Name:");
lblAddress = new JLabel("Address:");
lblZip = new JLabel("Zip/PostalCode:");
lblState = new JLabel("State/Province:");
lblType = new JLabel("Address Type:");
lblResult = new JLabel("Result:");
lblResultValue = new JLabel("Click the Validate Button");
//Create the open button
JButton validateButton = new JButton(AddressManager.VALIDATE);
validateButton.setMnemonic(KeyEvent.VK_V);
JButton exitButton = new JButton(AddressManager.EXIT);
exitButton.setMnemonic(KeyEvent.VK_X);
ButtonHandler objButtonHandler = new ButtonHandler(this);
validateButton.addActionListener(objButtonHandler);
exitButton.addActionListener(new ButtonHandler());
JPanel captionPanel = new JPanel();
String captionText = "<html>"
+ "Adapter Pattern Example</html>";
JLabel captionLabel = new JLabel(captionText);
captionPanel.add(captionLabel);
JPanel UIPanel = new JPanel();
//****************************************************
GridBagLayout gridbag = new GridBagLayout();
UIPanel.setLayout(gridbag);
GridBagConstraints gbc = new GridBagConstraints();
UIPanel.add(lblCustomerName);
UIPanel.add(txtCustomerName);
UIPanel.add(lblAddress);
UIPanel.add(txtAddress);
UIPanel.add(lblZip);
UIPanel.add(txtZip);
UIPanel.add(lblState);
UIPanel.add(txtState);
UIPanel.add(lblType);
UIPanel.add(cmbAddressType);
UIPanel.add(lblResult);
UIPanel.add(lblResultValue);
UIPanel.add(validateButton);
UIPanel.add(exitButton);
gbc.insets.top = 5;
gbc.insets.bottom = 5;
gbc.insets.left = 5;
gbc.insets.right = 5;
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 0;
gbc.gridy = 0;
gridbag.setConstraints(lblCustomerName, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
gridbag.setConstraints(txtCustomerName, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gridbag.setConstraints(lblAddress, gbc);
gbc.gridx = 1;
gbc.gridy = 1;
gridbag.setConstraints(txtAddress, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gridbag.setConstraints(lblZip, gbc);
gbc.gridx = 1;
gbc.gridy = 2;
gridbag.setConstraints(txtZip, gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gridbag.setConstraints(lblState, gbc);
gbc.gridx = 1;
gbc.gridy = 3;
gridbag.setConstraints(txtState, gbc);
gbc.gridx = 0;
gbc.gridy = 4;
gridbag.setConstraints(lblType, gbc);
gbc.gridx = 1;
gbc.gridy = 4;
gridbag.setConstraints(cmbAddressType, gbc);
gbc.gridx = 0;
gbc.gridy = 5;
gridbag.setConstraints(lblResult, gbc);
gbc.gridx = 1;
gbc.gridy = 5;
gridbag.setConstraints(lblResultValue, gbc);
//gbc.anchor = GridBagConstraints.CENTER;
gbc.insets.left = 2;
gbc.insets.right = 2;
gbc.insets.top = 40;
JPanel buttonPanel = new JPanel();
buttonPanel.add(validateButton);
buttonPanel.add(exitButton);
UIPanel.add(buttonPanel);
gbc.gridx = 1;
gbc.gridy = 6;
gridbag.setConstraints(buttonPanel, gbc);
//
//Add the buttons and the log to the frame
Container contentPane = getContentPane();
contentPane.add(UIPanel, BorderLayout.CENTER);
try {
UIManager.setLookAndFeel(new WindowsLookAndFeel());
SwingUtilities.updateComponentTreeUI(AddressManager.this);
} catch (Exception ex) {
System.out.println(ex);
}
}
public static void main(String[] args) {
JFrame frame = new AddressManager();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
//frame.pack();
frame.setSize(350, 300);
frame.setVisible(true);
}
public String getCustomerName() {
return txtCustomerName.getText();
}
public String getAddress() {
return txtAddress.getText();
}
public String getZip() {
return txtZip.getText();
}
public String getAddrState() {
return txtState.getText();
}
public String getAddressType() {
return (String) cmbAddressType.getSelectedItem();
}
public void setResultValue(String str) {
lblResultValue.setText(str);
}
} // End of class AddressManager class ButtonHandler implements ActionListener {
AddressManager objAddressManager;
public void actionPerformed(ActionEvent e) {
String validationResult = null;
//System.out.println(e.getActionCommand());
if (e.getActionCommand().equals(AddressManager.EXIT)) {
System.exit(1);
}
if (e.getActionCommand().equals(AddressManager.VALIDATE)) {
String custName = objAddressManager.getCustomerName();
String address = objAddressManager.getAddress();
String zip = objAddressManager.getZip();
String state = objAddressManager.getAddrState();
String addressType = objAddressManager.getAddressType();
//Create a customer object
Customer objCustomer = new Customer(custName, address, zip, state,
addressType);
//Check if the address is valid
if (objCustomer.isValidCustomerAddress()) {
validationResult = "Valid customer data";
} else {
validationResult = "Invalid customer data";
}
objAddressManager.setResultValue(validationResult);
}
}
public ButtonHandler() {
}
public ButtonHandler(AddressManager inObjAddressManager) {
objAddressManager = inObjAddressManager;
}
} // End of class ButtonHandler class USAddress extends AddressValidator {
public boolean isValidAddress(String inp_address, String inp_zip,
String inp_state) {
if (inp_address.trim().length() < 10)
return false;
if (inp_zip.trim().length() < 5)
return false;
if (inp_zip.trim().length() > 10)
return false;
if (inp_state.trim().length() != 2)
return false;
return true;
}
}// end of class class Customer {
public static final String US = "US";
public static final String CANADA = "Canada";
private String address;
private String name;
private String zip, state, type;
public boolean isValidCustomerAddress() {
if (type.equals(Customer.US)) {
USAddress us = new USAddress();
return us.isValidAddress(address, zip, state);
}
if (type.equals(Customer.CANADA)) {
CAAddress objCAAddress = new CAAddress();
CAAddressAdapter adapter = new CAAddressAdapter(objCAAddress);
return adapter.isValidAddress(address, zip, state);
}
return true;
}
public Customer(String inp_name, String inp_address, String inp_zip,
String inp_state, String inp_type) {
name = inp_name;
address = inp_address;
zip = inp_zip;
state = inp_state;
type = inp_type;
}
}// end of class class CAAddressAdapter extends AddressValidator {
private CAAddress objCAAddress;
public CAAddressAdapter(CAAddress address) {
objCAAddress = address;
}
public boolean isValidAddress(String inp_address, String inp_zip,
String inp_state) {
return objCAAddress
.isValidCanadianAddr(inp_address, inp_zip, inp_state);
}
}// end of class class CAAddress {
public boolean isValidCanadianAddr(String inp_address, String inp_pcode,
String inp_prvnc) {
if (inp_address.trim().length() < 15)
return false;
if (inp_pcode.trim().length() != 6)
return false;
if (inp_prvnc.trim().length() < 6)
return false;
return true;
}
}// end of class abstract class AddressValidator {
public abstract boolean isValidAddress(String inp_address, String inp_zip,
String inp_state);
}// end of class
</source>
Adapter Pattern in Java 2
<source lang="java">
//[C] 2002 Sun Microsystems, Inc.--- public class RunAdapterPattern {
public static void main(String [] arguments){
System.out.println("Example for the Adapter pattern");
System.out.println();
System.out.println("This example will demonstrate the Adapter by using the");
System.out.println(" class ContactAdapter to translate from classes written");
System.out.println(" in a foreign language (Chovnatlh and ChovnatlhImpl),");
System.out.println(" enabling their code to satisfy the Contact interface.");
System.out.println();
System.out.println("Creating a new ContactAdapter. This will, by extension,");
System.out.println(" create an instance of ChovnatlhImpl which will provide");
System.out.println(" the underlying Contact implementation.");
Contact contact = new ContactAdapter();
System.out.println();
System.out.println("ContactAdapter created. Setting contact data.");
contact.setFirstName("Thomas");
contact.setLastName("Williamson");
contact.setTitle("Science Officer");
contact.setOrganization("W3C");
System.out.println();
System.out.println("ContactAdapter data has been set. Printing out Contact data.");
System.out.println();
System.out.println(contact.toString());
}
} interface Contact{
public String getFirstName(); public String getLastName(); public String getTitle(); public String getOrganization(); public void setContact(Chovnatlh newContact); public void setFirstName(String newFirstName); public void setLastName(String newLastName); public void setTitle(String newTitle); public void setOrganization(String newOrganization);
} class ContactAdapter implements Contact{
private Chovnatlh contact;
public ContactAdapter(){
contact = new ChovnatlhImpl();
}
public ContactAdapter(Chovnatlh newContact){
contact = newContact;
}
public String getFirstName(){
return contact.tlhapWa$DIchPong();
}
public String getLastName(){
return contact.tlhapQavPong();
}
public String getTitle(){
return contact.tlhapPatlh();
}
public String getOrganization(){
return contact.tlhapGhom();
}
public void setContact(Chovnatlh newContact){
contact = newContact;
}
public void setFirstName(String newFirstName){
contact.cherWa$DIchPong(newFirstName);
}
public void setLastName(String newLastName){
contact.cherQavPong(newLastName);
}
public void setTitle(String newTitle){
contact.cherPatlh(newTitle);
}
public void setOrganization(String newOrganization){
contact.cherGhom(newOrganization);
}
public String toString(){
return contact.toString();
}
} interface Chovnatlh {
public String tlhapWa$DIchPong(); public String tlhapQavPong(); public String tlhapPatlh(); public String tlhapGhom(); public void cherWa$DIchPong(String chu$wa$DIchPong); public void cherQavPong(String chu$QavPong); public void cherPatlh(String chu$patlh); public void cherGhom(String chu$ghom);
} //pong = name //wa"DIch = first //Qav = last //patlh = rank (title) //ghom = group (organization) //tlhap = take (get) //cher = set up (set) //chu" = new //chovnatlh = specimen (contact) class ChovnatlhImpl implements Chovnatlh {
private String wa$DIchPong;
private String QavPong;
private String patlh;
private String ghom;
public ChovnatlhImpl() {
}
public ChovnatlhImpl(String chu$wa$DIchPong, String chu$QavPong,
String chu$patlh, String chu$ghom) {
wa$DIchPong = chu$wa$DIchPong;
QavPong = chu$QavPong;
patlh = chu$patlh;
ghom = chu$ghom;
}
public String tlhapWa$DIchPong() {
return wa$DIchPong;
}
public String tlhapQavPong() {
return QavPong;
}
public String tlhapPatlh() {
return patlh;
}
public String tlhapGhom() {
return ghom;
}
public void cherWa$DIchPong(String chu$wa$DIchPong) {
wa$DIchPong = chu$wa$DIchPong;
}
public void cherQavPong(String chu$QavPong) {
QavPong = chu$QavPong;
}
public void cherPatlh(String chu$patlh) {
patlh = chu$patlh;
}
public void cherGhom(String chu$ghom) {
ghom = chu$ghom;
}
public String toString() {
return wa$DIchPong + " " + QavPong + ": " + patlh + ", " + ghom;
}
}
</source>
