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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
/**
* Do some basic tests.
*/
public class BasicTest {
public static void main(String[] args) {
Mix proxyMe = new Mix();
Object proxy = createProxy(proxyMe);
if (!Proxy.isProxyClass(proxy.getClass()))
System.err.println("not a proxy class?");
if (Proxy.getInvocationHandler(proxy) == null)
System.err.println("ERROR: Proxy.getInvocationHandler is null");
/* take it for a spin; verifies instanceof constraint */
Shapes shapes = (Shapes) proxy;
shapes.circle(3);
shapes.rectangle(10, 20);
shapes.blob();
Quads quads = (Quads) proxy;
quads.rectangle(15, 25);
quads.trapezoid(6, 81.18, 4);
Colors colors = (Colors) proxy;
colors.red(1.0f);
colors.blue(777);
colors.mauve("sorry");
colors.blob();
try {
shapes.upChuck();
System.out.println("Didn't get expected exception");
} catch (IndexOutOfBoundsException ioobe) {
System.out.println("Got expected ioobe");
}
try {
shapes.upCheck();
System.out.println("Didn't get expected exception");
} catch (InterruptedException ie) {
System.out.println("Got expected ie");
}
/*
* Exercise annotations on Proxy classes. This is mostly to ensure
* that annotation calls work correctly on generated classes.
*/
System.out.println("");
Method[] methods = proxy.getClass().getDeclaredMethods();
System.out.println("Proxy methods: " + Arrays.deepToString(methods));
Method meth = methods[methods.length -1];
System.out.println("Decl annos: " + Arrays.deepToString(meth.getDeclaredAnnotations()));
Annotation[][] paramAnnos = meth.getParameterAnnotations();
System.out.println("Param annos (" + paramAnnos.length + ") : "
+ Arrays.deepToString(paramAnnos));
Field[] fields = proxy.getClass().getDeclaredFields();
System.out.println("Proxy fields: " + Arrays.deepToString(fields));
}
static Object createProxy(Object proxyMe) {
/* declare an object that will handle the method calls */
InvocationHandler handler = new MyInvocationHandler(proxyMe);
/* create the proxy class */
Class proxyClass = Proxy.getProxyClass(Shapes.class.getClassLoader(),
new Class[] { Quads.class, Colors.class });
/* create a proxy object, passing the handler object in */
Object proxy = null;
try {
Constructor<Class> cons;
cons = proxyClass.getConstructor(
new Class[] { InvocationHandler.class });
//System.out.println("Constructor is " + cons);
proxy = cons.newInstance(new Object[] { handler });
} catch (NoSuchMethodException nsme) {
System.err.println("failed: " + nsme);
} catch (InstantiationException ie) {
System.err.println("failed: " + ie);
} catch (IllegalAccessException ie) {
System.err.println("failed: " + ie);
} catch (InvocationTargetException ite) {
System.err.println("failed: " + ite);
}
return proxy;
}
}
/*
* Some interfaces.
*/
interface Shapes {
public void circle(int r);
public int rectangle(int x, int y);
public String blob();
public R0base checkMe();
public void upChuck();
public void upCheck() throws InterruptedException;
}
interface Quads extends Shapes {
public int rectangle(int x, int y);
public int square(int x, int y);
public int trapezoid(int x, double off, int y);
public R0a checkMe();
}
/*
* More interfaces.
*/
interface Colors {
public int red(float howRed);
public int green(double howGreen);
public double blue(int howBlue);
public int mauve(String apology);
public String blob();
public R0aa checkMe();
}
/*
* Some return types.
*/
class R0base { int mBlah; }
class R0a extends R0base { int mBlah_a; }
class R0aa extends R0a { int mBlah_aa; }
/*
* A class that implements them all.
*/
class Mix implements Quads, Colors {
public void circle(int r) {
System.out.println("--- circle " + r);
}
public int rectangle(int x, int y) {
System.out.println("--- rectangle " + x + "," + y);
return 4;
}
public int square(int x, int y) {
System.out.println("--- square " + x + "," + y);
return 4;
}
public int trapezoid(int x, double off, int y) {
System.out.println("--- trap " + x + "," + y + "," + off);
return 8;
}
public String blob() {
System.out.println("--- blob");
return "mix";
}
public int red(float howRed) {
System.out.println("--- red " + howRed);
return 0;
}
public int green(double howGreen) {
System.out.println("--- green " + howGreen);
return 1;
}
public double blue(int howBlue) {
System.out.println("--- blue " + howBlue);
return 2.54;
}
public int mauve(String apology) {
System.out.println("--- mauve " + apology);
return 3;
}
public R0aa checkMe() {
return null;
}
public void upChuck() {
throw new IndexOutOfBoundsException("upchuck");
}
public void upCheck() throws InterruptedException {
throw new InterruptedException("upcheck");
}
}
/*
* Invocation handler, defining the implementation of the proxy functions.
*/
class MyInvocationHandler implements InvocationHandler {
Object mObj;
public MyInvocationHandler(Object obj) {
mObj = obj;
}
/*
* This is called when anything gets invoked in the proxy object.
*/
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
Object result = null;
// Trap Object calls. This is important here to avoid a recursive
// invocation of toString() in the print statements below.
if (method.getDeclaringClass() == java.lang.Object.class) {
//System.out.println("!!! object " + method.getName());
if (method.getName().equals("toString"))
return super.toString();
else if (method.getName().equals("hashCode"))
return Integer.valueOf(super.hashCode());
else if (method.getName().equals("equals"))
return Boolean.valueOf(super.equals(args[0]));
else
throw new RuntimeException("huh?");
}
System.out.println("Invoke " + method);
if (args == null || args.length == 0) {
System.out.println(" (no args)");
} else {
for (int i = 0; i < args.length; i++)
System.out.println(" " + i + ": " + args[i]);
}
try {
if (true)
result = method.invoke(mObj, args);
else
result = -1;
System.out.println("Success: method " + method.getName()
+ " res=" + result);
} catch (InvocationTargetException ite) {
throw ite.getTargetException();
} catch (IllegalAccessException iae) {
throw new RuntimeException(iae);
}
return result;
}
}