Adapter Pattern - Example
/*
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><b><font color=cc0000 size=+1>"
+ "Adapter Pattern Example</font></b></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
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