Abstract Factory 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.SwingUtilities;
import javax.swing.UIManager;
import com.sun.java.swing.plaf.windows.WindowsLookAndFeel;
public class AutoSearchUI extends JFrame {
public static final String newline = "\n";
public static final String SEARCH = "Search";
public static final String EXIT = "Exit";
public static final String CAR = "Car";
public static final String SUV = "SUV";
private JComboBox cmbVehicleCategory, cmbVehicleType;
private JLabel lblVehicleCategory, lblVehicleType, lblCarName,
lblCarNameValue;
public AutoSearchUI() {
super("Abstract Factory - Example");
cmbVehicleCategory = new JComboBox();
cmbVehicleCategory.addItem(VehicleFactory.LUXURY_VEHICLE);
cmbVehicleCategory.addItem(VehicleFactory.NON_LUXURY_VEHICLE);
cmbVehicleType = new JComboBox();
cmbVehicleType.addItem(AutoSearchUI.CAR);
cmbVehicleType.addItem(AutoSearchUI.SUV);
lblVehicleCategory = new JLabel("Vehicle Category:");
lblVehicleType = new JLabel("VehicleType:");
lblCarName = new JLabel("Search Result:");
lblCarNameValue = new JLabel(" Please click on Search button");
//Create the open button
JButton openButton = new JButton(AutoSearchUI.SEARCH);
openButton.setMnemonic(KeyEvent.VK_S);
JButton exitButton = new JButton(AutoSearchUI.EXIT);
exitButton.setMnemonic(KeyEvent.VK_X);
ButtonHandler objButtonHandler = new ButtonHandler(this);
openButton.addActionListener(objButtonHandler);
exitButton.addActionListener(new ButtonHandler());
JPanel buttonPanel = new JPanel();
//****************************************************
GridBagLayout gridbag = new GridBagLayout();
buttonPanel.setLayout(gridbag);
GridBagConstraints gbc = new GridBagConstraints();
buttonPanel.add(lblVehicleCategory);
buttonPanel.add(cmbVehicleCategory);
buttonPanel.add(lblVehicleType);
buttonPanel.add(cmbVehicleType);
buttonPanel.add(lblCarName);
buttonPanel.add(lblCarNameValue);
buttonPanel.add(openButton);
buttonPanel.add(exitButton);
gbc.insets.top = 5;
gbc.insets.bottom = 5;
gbc.insets.left = 5;
gbc.insets.right = 5;
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 0;
gridbag.setConstraints(lblVehicleCategory, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 0;
gridbag.setConstraints(cmbVehicleCategory, gbc);
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 1;
gridbag.setConstraints(lblVehicleType, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 1;
gridbag.setConstraints(cmbVehicleType, gbc);
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 2;
gridbag.setConstraints(lblCarName, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 2;
gridbag.setConstraints(lblCarNameValue, gbc);
gbc.insets.left = 2;
gbc.insets.right = 2;
gbc.insets.top = 40;
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 5;
gridbag.setConstraints(openButton, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 5;
gridbag.setConstraints(exitButton, gbc);
//****************************************************
//Add the buttons and the log to the frame
Container contentPane = getContentPane();
contentPane.add(buttonPanel, BorderLayout.CENTER);
try {
UIManager.setLookAndFeel(new WindowsLookAndFeel());
SwingUtilities.updateComponentTreeUI(AutoSearchUI.this);
} catch (Exception ex) {
System.out.println(ex);
}
}
public static void main(String[] args) {
JFrame frame = new AutoSearchUI();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
//frame.pack();
frame.setSize(400, 300);
frame.setVisible(true);
}
public String getSelectedCategory() {
return (String) cmbVehicleCategory.getSelectedItem();
}
public String getSelectedType() {
return (String) cmbVehicleType.getSelectedItem();
}
public void setResult(String searchResult) {
lblCarNameValue.setText(searchResult);
}
} // End of class AutoSearchUI
class ButtonHandler implements ActionListener {
AutoSearchUI objAutoSearchUI;
public void actionPerformed(ActionEvent e) {
String searchResult = null;
if (e.getActionCommand().equals(AutoSearchUI.EXIT)) {
System.exit(1);
}
if (e.getActionCommand().equals(AutoSearchUI.SEARCH)) {
//get input values
String vhCategory = objAutoSearchUI.getSelectedCategory();
String vhType = objAutoSearchUI.getSelectedType();
//get one of Luxury or NonLuxury vehicle factories
VehicleFactory vf = VehicleFactory.getVehicleFactory(vhCategory);
if (vhType.equals(AutoSearchUI.CAR)) {
Car c = vf.getCar();
searchResult = "Name: " + c.getCarName() + " Features: "
+ c.getCarFeatures();
}
if (vhType.equals(AutoSearchUI.SUV)) {
SUV s = vf.getSUV();
searchResult = "Name: " + s.getSUVName() + " Features: "
+ s.getSUVFeatures();
}
objAutoSearchUI.setResult(searchResult);
}
}
public ButtonHandler() {
}
public ButtonHandler(AutoSearchUI inObjAutoSearchUI) {
objAutoSearchUI = inObjAutoSearchUI;
}
} // End of class ButtonHandler
abstract class VehicleFactory {
public static final String LUXURY_VEHICLE = "Luxury";
public static final String NON_LUXURY_VEHICLE = "Non-Luxury";
public abstract Car getCar();
public abstract SUV getSUV();
public static VehicleFactory getVehicleFactory(String type) {
if (type.equals(VehicleFactory.LUXURY_VEHICLE))
return new LuxuryVehicleFactory();
if (type.equals(VehicleFactory.NON_LUXURY_VEHICLE))
return new NonLuxuryVehicleFactory();
return new LuxuryVehicleFactory();
}
} // End of class
interface Car {
public String getCarName();
public String getCarFeatures();
} // End of class
interface SUV {
public String getSUVName();
public String getSUVFeatures();
} // End of class
class LuxuryCar implements Car {
private String name;
public LuxuryCar(String cName) {
name = cName;
}
public String getCarName() {
return name;
}
public String getCarFeatures() {
return "Luxury Car Features ";
};
} // End of class
class LuxurySUV implements SUV {
private String name;
public LuxurySUV(String sName) {
name = sName;
}
public String getSUVName() {
return name;
}
public String getSUVFeatures() {
return "Luxury SUV Features ";
};
} // End of class
class LuxuryVehicleFactory extends VehicleFactory {
public Car getCar() {
return new LuxuryCar("L-C");
}
public SUV getSUV() {
return new LuxurySUV("L-S");
}
} // End of class
class NonLuxuryCar implements Car {
private String name;
public NonLuxuryCar(String cName) {
name = cName;
}
public String getCarName() {
return name;
}
public String getCarFeatures() {
return "Non-Luxury Car Features ";
};
} // End of class
class NonLuxurySUV implements SUV {
private String name;
public NonLuxurySUV(String sName) {
name = sName;
}
public String getSUVName() {
return name;
}
public String getSUVFeatures() {
return "Non-Luxury SUV Features ";
};
} // End of class
class NonLuxuryVehicleFactory extends VehicleFactory {
public Car getCar() {
return new NonLuxuryCar("NL-C");
}
public SUV getSUV() {
return new NonLuxurySUV("NL-S");
}
} // End of class
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