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/* ExceptionRaising.java -- Tests which check that the exceptions raised in an
InvocationHandler are correct.
Copyright (C) 2006 Olivier Jolly <olivier.jolly@pcedev.com>
This file is part of Mauve.
Mauve is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Mauve is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with Mauve; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
// Tags: JDK1.3
package gnu.testlet.java.lang.reflect.Proxy;
import gnu.testlet.TestHarness;
import gnu.testlet.Testlet;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
/**
* Tests about the exceptions throwable when using proxies
* @author Olivier Jolly <olivier.jolly@pcedev.com>
* @see java.lang.reflect.Proxy
*/
public class ExceptionRaising implements Testlet
{
public void test(TestHarness harness)
{
testWrappedException(harness);
testReturnNull(harness);
testClassCastException(harness);
}
/**
* Test the behaviour of proxy the invocation of which returns
* <code>null</code>
* @param harness
* the test harness
*/
private void testReturnNull(TestHarness harness)
{
Object proxy = Proxy.newProxyInstance(this.getClass().getClassLoader(),
new Class[] { Serializable.class },
new NullInvocationHandler());
try
{
proxy.getClass();
harness.checkPoint("Passed returning null when a non primitive object is expected");
}
catch (Exception e)
{
harness.fail("Returning null should be safe when a non primitive object is expected");
}
try
{
proxy.hashCode();
harness.fail("Returning null when a primitive return value is expected should have thrown an exception");
}
catch (Exception e)
{
harness.check(e instanceof NullPointerException,
"Checking that exception thrown is a NullPointerException");
}
}
/**
* Tests the behaviour of proxy the invocation of which throws an exception
* @param harness
* the test harness
*/
private void testWrappedException(TestHarness harness)
{
Exception exception = new Exception();
Object proxy = Proxy.newProxyInstance(
this.getClass().getClassLoader(),
new Class[] { Serializable.class },
new ExceptionInvocationHandler(
exception));
try
{
proxy.toString();
harness.fail("Call to toString via a proxy should have failed with an exception");
}
catch (UndeclaredThrowableException e)
{
harness.check(e.getUndeclaredThrowable(), exception,
"Exception thrown check");
}
}
/**
* Tests that if the return value is incorrect, a ClassCastException is thrown
* @param harness
* the test harness
*/
private void testClassCastException(TestHarness harness)
{
Object proxy = Proxy.newProxyInstance(this.getClass().getClassLoader(),
new Class[] { Serializable.class },
new ThisInvocationHandler());
try
{
proxy.toString();
}
catch (Exception e)
{
harness.check(e instanceof ClassCastException,
"Checking that the raised exception was a ClassPathException");
}
}
private static class ExceptionInvocationHandler implements InvocationHandler
{
Exception exception;
public ExceptionInvocationHandler(Exception exception)
{
this.exception = exception;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
throw exception;
}
}
private static class NullInvocationHandler implements InvocationHandler
{
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
return null;
}
}
private static class ThisInvocationHandler implements InvocationHandler
{
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
return this;
}
}
}
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