Apple WebObjects 3.5 - Manual (Page 133)

Controlling Session State
133
You can see implementations of encodeWithCoder: and initWithCoder: in the
DodgeDemo application, in the class ShoppingCart.
- encodeWithCoder:(NSCoder *)coder {
[coder encodeObject:carID];
[coder encodeObject:colorID];
[coder encodeObject:colorPicture];
[coder encodeObject:packagesIDs];
[coder encodeObject:downPayment];
[coder encodeObject:leaseTerm];
}
- initWithCoder:(NSCoder *)coder {
self = [super init];
carID = [[coder decodeObject] retain];
colorID = [[coder decodeObject] retain];
colorPicture = [[coder decodeObject] retain];
packagesIDs = [[coder decodeObject] retain];
downPayment = [[coder decodeObject] retain];
leaseTerm = [[coder decodeObject] retain];
car = nil;
return self;
}
The Java version of DodgeDemo’s ShoppingCart implements these
methods instead:
public void encodeWithCoder(Coder coder) {
coder.encodeObject(leaseTerm);
coder.encodeObject(downPayment);
// DodgeDemoJava defines a custom Car object that contains all
// info about the car.
coder.encodeObject(car);
}
public ShoppingCart(Coder coder) {
super();
leaseTerm = coder.decodeObject();
downPayment = coder.decodeObject();
Car aCar = (Car)coder.decodeObject();
setCar(aCar);
}
For more information on archiving, see the class specifications for
NSCoding, NSCoder, NSArchiver, and NSUnarchiver in the Foundation
Framework Reference.
Controlling Session State
Maintaining state in memory on the server can consume considerable
resources, so WebObjects provides a number of mechanisms to control how