Java GenericVisitorAdapter: Simplifying the Visitor Pattern
The Visitor Pattern is a well-known design pattern in object-oriented programming that allows adding new operations to existing object structures without modifying those structures. However, implementing the Visitor Pattern can be tedious and error-prone, especially when dealing with complex object hierarchies. Fortunately, the Java language provides a useful class called GenericVisitorAdapter that simplifies implementing the Visitor Pattern.
The GenericVisitorAdapter class is part of the visitor framework in the ObjectModelCore library, which is included in the JBOSS Application Server. This class implements the Visitor design pattern by providing a default implementation for each possible visit() method in the visitor interface. This default implementation does nothing and simply returns null.
To use the GenericVisitorAdapter class, you need to define a visitor interface that extends the Visitor interface provided by the ObjectModelCore library. This interface should declare a visit() method for each type of object that needs to be visited.
For example, if you have a class hierarchy that includes a class called MyClass, you would define a visitor interface like this:
public interface MyVisitor extends Visitor {
Object visit(MyClass myClass);
}
You can then implement the MyVisitor interface using the GenericVisitorAdapter class, like this:
public class MyVisitorImpl extends GenericVisitorAdapter implements MyVisitor {
public Object visit(MyClass myClass) {
// do something with myClass
return null;
}
}
The GenericVisitorAdapter class provides a default implementation for all other visit() methods in the MyVisitor interface.
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