/*

 * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package evalexpr;

import java.util.Map;

/**

 * A class loader which loads classes from byte arrays.

 *

 * <p><b>This is NOT part of any API supported by Sun Microsystems.

 * If you write code that depends on this, you do so at your own

 * risk.  This code and its internal interfaces are subject to change

 * or deletion without notice.</b></p>

 * @author Peter von der Ahé

 */

public class ByteArrayClassLoader extends ClassLoader {

    /**

     * Maps binary class names to class files stored as byte arrays.

     */

    private Map<String, byte[]> classes;

    /**

     * Creates a new instance of ByteArrayClassLoader

     * @param classes a map from binary class names to class files stored as byte arrays

     */

    public ByteArrayClassLoader(Map<String, byte[]> classes) {

        this.classes = classes;

    }

    @Override

    public Class<?> loadClass(String name) throws ClassNotFoundException {

        try {

            return super.loadClass(name);

        } catch (ClassNotFoundException e) {

            byte[] classData = classes.get(name);

            return defineClass(name, classData, 0, classData.length);

        }

    }

}