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package org.apache.catalina.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;

/**
 * Custom subclass of ObjectInputStream that loads from the
 * class loader for this web application.  This allows classes defined only
 * with the web application to be found correctly.
 *
 * @author Craig R. McClanahan
 * @author Bip Thelin
 * @version $Revision: 1.2 $, $Date: 2005/12/08 01:28:15 $
 */

public final class CustomObjectInputStream
    extends ObjectInputStream {


    /**
     * The class loader we will use to resolve classes.
     */
    private ClassLoader classLoader = null;


    /**
     * Construct a new instance of CustomObjectInputStream
     *
     * @param stream The input stream we will read from
     * @param classLoader The class loader used to instantiate objects
     *
     * @exception IOException if an input/output error occurs
     */
    public CustomObjectInputStream(InputStream stream,
                                   ClassLoader classLoader)
        throws IOException {

        super(stream);
        this.classLoader = classLoader;
    }


    /**
     * Load the local class equivalent of the specified stream class
     * description, by using the class loader assigned to this Context.
     *
     * @param classDesc Class description from the input stream
     *
     * @exception ClassNotFoundException if this class cannot be found
     * @exception IOException if an input/output error occurs
     */
    public Class resolveClass(ObjectStreamClass classDesc)
             throws ClassNotFoundException, IOException {
        try {
            return Class.forName(classDesc.getName(), false, classLoader);
        } catch (ClassNotFoundException e) {
            try {
                // Try also the superclass because of primitive types
                return super.resolveClass(classDesc);
            }  catch (ClassNotFoundException e2) {
                // Rethrow original exception, as it can have more information
                // about why the class was not found. BZ 48007
                throw e;
            }
        }
    }


}