Java Reference
In-Depth Information
String promotedFireworkName =
p.getProperty("promote");
if (promotedFireworkName != null)
{
promoted = Firework.lookup(
promotedFireworkName);
}
}
catch (Exception e)
{
}
}
public boolean hasItem() {
return promoted != null;
}
public Firework recommend(Customer c) {
return promoted;
}
}
The
RandomAdvisor
class is simple:
package com.oozinoz.recommend;
import com.oozinoz.fireworks.*;
public class RandomAdvisor implements Advisor
{
public static final RandomAdvisor singleton =
new RandomAdvisor();
private RandomAdvisor()
{
}
public Firework recommend(Customer c)
{
return Firework.getRandom();
}
}
CHALLENGE 23.3
Write the code for
ItemAdvisor.java
.
The refactoring of
Customer
separates the
selection
of a strategy (or "advisor") from the
use
of the strategy. An
advisor
attribute of a
Customer
object holds the context, or current
choice, of the strategy to apply. The refactored
Customer
class lazy-initializes this attribute
with logic that reflects Oozinoz's advertising policies:
