eu.bandm.tools.util

Class DynamicVisitor<C>

java.lang.Object

eu.bandm.tools.util.DynamicVisitor<C>

public abstract class DynamicVisitor<C>
extends Object

An abstract base class for reflection-based type case distinctions. Subclasses should overload the visit(C, boolean) method with a method void visit(A x) to match objects of class A. Methods of subclasses will only be considered as matches for an input if they have

• public access to be retrieved with Class.getMethod(java.lang.String, java.lang.Class<?>...)
• the name visit, and
• exactly one parameter of a subclass of C.

Methods with a return type other than void do match, but their result is ignored.

Constructor Summary

Constructors

Constructor and Description
DynamicVisitor()

Method Summary

Modifier and Type	Method and Description
void	visit(C x, boolean total) Finds the best-matching visit method for the dynamic type of a given object and invokes it.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DynamicVisitor

public DynamicVisitor()

Method Detail

visit

public void visit(C x,
                  boolean total)

Finds the best-matching visit method for the dynamic type of a given object and invokes it.

Parameters:

x - the input object.

total - if true and x is null or no match is found, then nothing is done.

Throws:

IllegalArgumentException - if the matching method throws an exception or cannot be invoked for some reason, or if total is false and no match is found.

NullPointerException - if total is false and x is null.