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package typeinfo;

//: typeinfo/SelectingMethods.java

// Looking for particular methods in a dynamic proxy.

import java.lang.reflect.*;

import static net.mindview.util.Print.*;

class MethodSelector implements InvocationHandler {

private Object proxied;

public MethodSelector(Object proxied) {

this.proxied = proxied;

}

public Object

invoke(Object proxy, Method method, Object[] args)

throws Throwable {

if(method.getName().equals("interesting"))

print("Proxy detected the interesting method");

return method.invoke(proxied, args);

}

}

interface SomeMethods {

void boring1();

void boring2();

void interesting(String arg);

void boring3();

}

class Implementation implements SomeMethods {

public void boring1() { print("boring1"); }

public void boring2() { print("boring2"); }

public void interesting(String arg) {

print("interesting " + arg);

}

public void boring3() { print("boring3"); }

}

class SelectingMethods {

public static void main(String[] args) {

SomeMethods proxy= (SomeMethods)Proxy.newProxyInstance(

SomeMethods.class.getClassLoader(),

new Class[]{ SomeMethods.class },

new MethodSelector(new Implementation()));

proxy.boring1();

proxy.boring2();

proxy.interesting("bonobo");

proxy.boring3();

}

} /* Output:

boring1

boring2

Proxy detected the interesting method

interesting bonobo

boring3

*///:~