Java Reference
In-Depth Information
Figure 29.3. The FindVisitor class effectively adds a find() operation to the
MachineComponent hierarchy.
The visit() methods do not return an object, so the FindVisitor class records the status
of a search in its sought instance variable:
package com.oozinoz.dublin;
import com.oozinoz.machine.*;
import java.util.*;
public class FindVisitor implements MachineVisitor
{
private MachineComponent sought;
private int soughtId;
public MachineComponent find(
MachineComponent mc, int id)
{
sought = null;
soughtId = id;
mc.accept(this);
return sought;
}
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