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/* DeclaringClass.java -- Checks for the declaring class of the special
methods in Object, namely toString, Equals and hashCode
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
// Uses: ProxyUtils
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.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
/**
* Checks that the public non final methods of Objects (ie equals, toString and
* hashCode) are built in Proxy with Object as declaring class whatever the
* method definition of the interfaces used for the proxy creation
* @author Olivier Jolly <olivier.jolly@pcedev.com>
*/
public class DeclaringClass implements Testlet
{
public void test(TestHarness harness)
{
Class[] testableInterfaces = { Serializable.class,
WithObjectOverrides.class,
WithoutObjectOverrides.class, Base.class,
Derived.class };
for (int i = 0; i < testableInterfaces.length; i++)
{
Class interfaceItem = testableInterfaces[i];
Object proxy = Proxy.newProxyInstance(
this.getClass().getClassLoader(),
new Class[] { interfaceItem },
new ExpectObjectDeclaringClassIfPossibleHandler(
harness));
harness.checkPoint("Testing " + interfaceItem);
proxy.equals(new Object());
proxy.hashCode();
proxy.toString();
}
}
/**
* Handler which checks that invoked public non final methods of Object have
* their declared class set to Object.class
*/
private static class ExpectObjectDeclaringClassIfPossibleHandler implements
InvocationHandler
{
static Collection objectMethods;
static
{
objectMethods = new ArrayList();
try
{
objectMethods.add(Object.class.getMethod(
"equals",
new Class[] { Object.class }));
objectMethods.add(Object.class.getMethod("hashCode", null));
objectMethods.add(Object.class.getMethod("toString", null));
}
catch (NoSuchMethodException e)
{
e.printStackTrace();
throw new Error("Missing core methods in Object");
}
}
TestHarness harness;
public ExpectObjectDeclaringClassIfPossibleHandler(TestHarness harness)
{
this.harness = harness;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
boolean expectObjectDeclaringClass = false;
for (Iterator iter = objectMethods.iterator(); iter.hasNext();)
{
Method objectMethod = (Method) iter.next();
if (ProxyUtils.compareMethodOnNameAndParameterTypes(objectMethod,
method))
{
expectObjectDeclaringClass = true;
}
}
harness.check((method.getDeclaringClass() == Object.class) == expectObjectDeclaringClass);
return ProxyUtils.getNeutralValue(method.getReturnType());
}
}
/**
* Interface redefining the same public non final methods as Object
*/
private static interface WithObjectOverrides
{
public boolean equals(Object obj);
public int hashCode();
public String toString();
}
/**
* Interface redefining similar methods than Object
*/
private static interface WithoutObjectOverrides
{
public boolean equals();
public long hashCode(Object obj);
public void toString(long foo);
}
/**
* Simple interface defining a method
*/
private static interface Base
{
public void foo();
}
/**
* Simple interface overriding a non Object method
*/
private static interface Derived extends Base
{
public void foo();
}
}
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