Core Design Patterns: Adapter Pattern

package adapterPattern;

/*

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 = ""
+ "Adapter Pattern Example";

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_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

UML Of Adapter Pattern