/*
* @(#)ArrayClassLoader.java 1.0.0 11/17/2000 - 12:01:17
*
* Copyright (C) 2000,2002-2003 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.util.classes.v1.jdk0;
import java.util.Hashtable;
import java.util.Enumeration;
import java.util.Vector;
/**
* Load classes by byte Arrays. JDK 1.0+ compatible.
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @version $Date: 2003/02/10 22:52:36 $
* @since November 17, 2000 (GroboUtils Alpha 0.9.0)
*/
public class ArrayClassLoader extends ClassLoader
{
//----------------------------
// Public data
//----------------------------
// Private data
/**
* list of all classes
*/
private Hashtable m_classList = new Hashtable();
private Hashtable m_classCache = new Hashtable();
/**
* The original bytecode source, for linking.
*/
private BytecodeSource m_bytecodeSource = null;
//----------------------------
// constructors
/**
* Default constructor
*/
public ArrayClassLoader()
{
// do nothing
}
//----------------------------
// Public methods
/**
* Sets the reference to the original bytecode loader. By default,
* the value is <tt>null</tt>. If the value is <tt>null</tt>, then
* there is the possibility for a link error.
*/
public void setBytecodeSource( BytecodeSource bs )
{
this.m_bytecodeSource = bs;
}
/**
* Add a new class to the internal list.
*/
public void addClass( String name, byte[] bytecode )
{
if (name == null || bytecode == null)
{
throw new IllegalArgumentException("no null args");
}
this.m_classList.put( name, bytecode );
}
// inherited from ClassLoader
/**
* @exception ClassNotFoundException thrown if the given class name
* could not be found, or if there was a problem loading the
* bytecode for the class.
*/
public Class loadClass( String name, boolean resolve )
throws ClassNotFoundException
{
Class c;
if (name == null)
{
throw new IllegalArgumentException("classname is null");
}
c = (Class)this.m_classCache.get( name );
if (c == null)
{
try
{
c = findSystemClass( name );
}
catch (Exception ex)
{
byte bytecode[] = getBytecode( name );
if (bytecode == null)
{
System.out.println(this.getClass().getName()+"::loadClass( '"+name+
"' ): bytecode for class was never defined.");
throw new ClassNotFoundException( name );
}
else
{
try
{
c = defineClass( name, bytecode, 0, bytecode.length );
this.m_classCache.put( name, c );
}
catch (Exception ex2)
{
// something wrong with the class format
throw new ClassNotFoundException(
"Bad class format for class "+name );
}
}
}
}
if (resolve)
{
resolveClass( c );
}
return c;
}
//----------------------------
// Protected methods
/**
* Retrieves the internal bytecode for the given class. If not known,
* then will attempt to pass it to the bytecode source.
*
* @param className a non-null class name.
*/
protected byte[] getBytecode( String className )
{
byte bytecode[] = (byte[])this.m_classList.get( className );
if (bytecode == null)
{
if (this.m_bytecodeSource != null)
{
bytecode = this.m_bytecodeSource.getBytecode( className );
if (bytecode != null)
{
addClass( className, bytecode );
}
}
}
return bytecode;
}
//----------------------------
// Private methods
}
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