/jEdit/tags/jedit-4-5-pre1/org/gjt/sp/jedit/bsh/classpath/DiscreteFilesClassLoader.java

/*****************************************************************************
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 *  This file is part of the BeanShell Java Scripting distribution.          *
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 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
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 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
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 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package org.gjt.sp.jedit.bsh.classpath;

import java.util.*;

import org.gjt.sp.jedit.bsh.BshClassManager;
import org.gjt.sp.jedit.bsh.classpath.BshClassPath.ClassSource;

/**
	A classloader which can load one or more classes from specified sources.
	Because the classes are loaded via a single classloader they change as a
	group and any versioning cross dependencies can be managed.
*/
public class DiscreteFilesClassLoader extends BshClassLoader 
{
	/**
		Map of class sources which also implies our coverage space.
	*/
	ClassSourceMap map;

	public static class ClassSourceMap extends HashMap 
	{
		public void put( String name, ClassSource source ) {
			super.put( name, source );
		}
		public ClassSource get( String name ) {
			return (ClassSource)super.get( name );
		}
	}
	
	public DiscreteFilesClassLoader( 
		BshClassManager classManager, ClassSourceMap map ) 
	{
		super( classManager );
		this.map = map;
	}

	/**
	*/
	public Class findClass( String name ) throws ClassNotFoundException 
	{
		// Load it if it's one of our classes
		ClassSource source = map.get( name );

		if ( source != null )
		{
			byte [] code = source.getCode( name );
			return defineClass( name, code, 0, code.length );
		} else
			// Let superclass BshClassLoader (URLClassLoader) findClass try 
			// to find the class...
			return super.findClass( name );
	}

	public String toString() {
		return super.toString() + "for files: "+map;
	}

}