Mega Code Archive
This program demonstrates various persistence delegates
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/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.geom.Rectangle2D;
import java.beans.BeanInfo;
import java.beans.ConstructorProperties;
import java.beans.DefaultPersistenceDelegate;
import java.beans.Encoder;
import java.beans.ExceptionListener;
import java.beans.Expression;
import java.beans.Introspector;
import java.beans.PersistenceDelegate;
import java.beans.Statement;
import java.beans.XMLEncoder;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.util.BitSet;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
* This program demonstrates various persistence delegates.
*
* @version 1.01 2007-10-03
* @author Cay Horstmann
*/
public class PersistenceDelegateTest {
public static class Point {
@ConstructorProperties( { "x", "y" })
public Point(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
private final int x, y;
}
public static void main(String[] args) throws Exception {
PersistenceDelegate delegate = new PersistenceDelegate() {
protected Expression instantiate(Object oldInstance, Encoder out) {
Employee e = (Employee) oldInstance;
GregorianCalendar c = new GregorianCalendar();
c.setTime(e.getHireDay());
return new Expression(oldInstance, Employee.class, "new", new Object[] { e.getName(),
e.getSalary(), c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE) });
}
};
BeanInfo info = Introspector.getBeanInfo(Employee.class);
info.getBeanDescriptor().setValue("persistenceDelegate", delegate);
XMLEncoder out = new XMLEncoder(System.out);
out.setExceptionListener(new ExceptionListener() {
public void exceptionThrown(Exception e) {
e.printStackTrace();
}
});
out.setPersistenceDelegate(Rectangle2D.Double.class, new DefaultPersistenceDelegate(
new String[] { "x", "y", "width", "height" }));
out.setPersistenceDelegate(Inet4Address.class, new DefaultPersistenceDelegate() {
protected Expression instantiate(Object oldInstance, Encoder out) {
return new Expression(oldInstance, InetAddress.class, "getByAddress",
new Object[] { ((InetAddress) oldInstance).getAddress() });
}
});
out.setPersistenceDelegate(BitSet.class, new DefaultPersistenceDelegate() {
protected void initialize(Class<?> type, Object oldInstance, Object newInstance, Encoder out) {
super.initialize(type, oldInstance, newInstance, out);
BitSet bs = (BitSet) oldInstance;
for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i + 1))
out.writeStatement(new Statement(bs, "set", new Object[] { i, i + 1, true }));
}
});
out.writeObject(new Employee("Harry Hacker", 50000, 1989, 10, 1));
out.writeObject(new Point(17, 29));
out.writeObject(new java.awt.geom.Rectangle2D.Double(5, 10, 20, 30));
out.writeObject(InetAddress.getLocalHost());
BitSet bs = new BitSet();
bs.set(1, 4);
bs.clear(2, 3);
out.writeObject(bs);
out.close();
}
}
/*
* This program is a part of the companion code for Core Java 8th ed.
* (http://horstmann.com/corejava)
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
class Employee {
public Employee(String n, double s, int year, int month, int day) {
name = n;
salary = s;
GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
// GregorianCalendar uses 0 for January
hireDay = calendar.getTime();
}
public Employee(String n, double s, Date h) {
name = n;
salary = s;
hireDay = h;
}
public String getName() {
return name;
}
public double getSalary() {
return salary;
}
public Date getHireDay() {
return hireDay;
}
public void raiseSalary(double byPercent) {
double raise = salary * byPercent / 100;
salary += raise;
}
private String name;
private double salary;
private Date hireDay;
}
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