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//******************************************************************************
//
// File: MPObjectInputStream.java
// Package: edu.rit.mp
// Unit: Class edu.rit.mp.MPObjectInputStream
//
// This Java source file is copyright (C) 2006 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ 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 3 of the License, or (at your option) any later version.
//
// PJ 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.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.mp;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
/**
* Class MPObjectInputStream provides an object input stream that can load
* classes from an alternate class loader.
*
* @author Alan Kaminsky
* @version 31-Jan-2006
*/
class MPObjectInputStream
extends ObjectInputStream
{
// Hidden data members.
private ClassLoader myClassLoader;
// Exported constructors.
/**
* Create a new MP object input stream. An alternate class loader will not
* be used.
*
* @param in Underlying input stream.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public MPObjectInputStream
(InputStream in)
throws IOException
{
super (in);
}
/**
* Create a new MP object input stream. The given class loader will be used
* to load classes; if null, an alternate class loader will not be used.
*
* @param in Underlying input stream.
* @param cl Alternate class loader, or null.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public MPObjectInputStream
(InputStream in,
ClassLoader cl)
throws IOException
{
super (in);
myClassLoader = cl;
}
// Hidden operations.
/**
* Load the local class equivalent of the specified stream class
* description.
*
* @param desc Stream class description.
*
* @return Local class.
*
* @exception IOException
* Thrown if an I/O error occurred.
* @exception ClassNotFoundException
* Thrown if the local class could not be found.
*/
protected Class<?> resolveClass
(ObjectStreamClass desc)
throws IOException, ClassNotFoundException
{
try
{
return super.resolveClass (desc);
}
catch (ClassNotFoundException exc)
{
if (myClassLoader != null)
{
return Class.forName (desc.getName(), false, myClassLoader);
}
else
{
throw exc;
}
}
}
}
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