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/*
Copyright (C) 2003 C. Brian Jones
Copyright (C) 2004 Mark J. Wielaard
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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package gnu.testlet.java.net.Socket;
import java.net.*;
import java.lang.reflect.*;
public class TestSocketImplFactory
implements SocketImplFactory
{
private Constructor implConstructor = null;
public TestSocketImplFactory()
{
// We better make sure we can actually return something in case
// this factory is actually used later. The trick we use is to
// create a Socket with the empty constructor (which is defined as
// returning an unconnected Socket with the default SocketImpl).
// Then we use reflection to scoop out this object.
SocketImpl impl = null;
try
{
Class sic = Class.forName("java.net.SocketImpl");
Socket s = new Socket();
Field[] fields = s.getClass().getDeclaredFields();
int i = 0;
while (impl == null && i < fields.length)
{
Field f = fields[i];
Class fc = f.getType();
if (sic.isAssignableFrom(fc))
{
f.setAccessible(true);
impl = (SocketImpl) f.get(s);
}
i++;
}
}
catch (IllegalAccessException iae)
{
Error e = new InternalError("Unable to get default SocketImpl " + iae);
e.initCause(iae);
throw e;
}
catch (ClassNotFoundException cnf)
{
Error e = new InternalError("Unable to get default SocketImpl " + cnf);
e.initCause(cnf);
throw e;
}
if (impl == null)
throw new InternalError("Couldn't determine default SocketImpl");
// Now hope that there is a non-argument constructor.
int i = 0;
Constructor[] cons = impl.getClass().getDeclaredConstructors();
while (implConstructor == null && i < cons.length)
{
Constructor c = cons[i];
if (c.getParameterTypes().length == 0)
implConstructor = c;
i++;
}
if (implConstructor == null)
throw new InternalError("Couldn't get SocketImpl Constructor");
else
implConstructor.setAccessible(true);
}
public SocketImpl createSocketImpl ()
{
try
{
return (SocketImpl) implConstructor.newInstance(new Object[0]);
}
catch (InstantiationException ie)
{
ie.printStackTrace();
// Null is better then nothing?
return null;
}
catch (IllegalAccessException iae)
{
iae.printStackTrace();
// Null is better then nothing?
return null;
}
catch(InvocationTargetException ite)
{
ite.printStackTrace();
// Null is better then nothing?
return null;
}
}
}
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