// Copyright (c) 2002 Graz University of Technology. All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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// 3. The end-user documentation included with the redistribution, if any, must
//    include the following acknowledgment:
// 
//    "This product includes software developed by IAIK of Graz University of
//     Technology."
// 
//    Alternately, this acknowledgment may appear in the software itself, if and
//    wherever such third-party acknowledgments normally appear.
// 
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
//    Technology" must not be used to endorse or promote products derived from this
//    software without prior written permission.
// 
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
//    nor may "IAIK" appear in their name, without prior written permission of
//    Graz University of Technology.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// POSSIBILITY OF SUCH DAMAGE.

package iaik.pkcs.pkcs11;

/**
 * The base class for all exceptions in this package. It is able to wrap a other
 * exception from a lower layer.
 *
 * @author <a href="mailto:Karl.Scheibelhofer@iaik.at"> Karl Scheibelhofer </a>
 * @version 1.0
 * @invariants
 */
public class TokenException extends Exception {

	/**
	 * An encapsulated (inner) exception. Possibly, an exception from a lower
	 * layer that ca be propagated to a higher layer only in wrapped form.
	 */
	protected Exception encapsulatedException_;

	/**
	 * The default constructor.
	 *
	 * @preconditions
	 * @postconditions
	 */
	public TokenException() {
		super();
	}

	/**
	 * Constructor taking an exception message.
	 *
	 * @param message The message giving details about the exception to ease
	 *                debugging.
	 * @preconditions
	 * @postconditions
	 */
	public TokenException(String message) {
		super(message);
	}

	/**
	 * Constructor taking an other exception to wrap.
	 *
	 * @param encapsulatedException The other exception the wrap into this.
	 * @preconditions
	 * @postconditions
	 */
	public TokenException(Exception encapsulatedException) {
		super();
		encapsulatedException_ = encapsulatedException;
	}

	/**
	 * Constructor taking a message for this exception and an other exception to
	 * wrap.
	 *
	 * @param message The message giving details about the exception to ease
	 *                debugging.
	 * @param encapsulatedException The other exception the wrap into this.
	 * @preconditions
	 * @postconditions
	 */
	public TokenException(String message, Exception encapsulatedException) {
		super(message);
		encapsulatedException_ = encapsulatedException;
	}

	/**
	 * Get the encapsulated (wrapped) exception. May be null.
	 *
	 * @return The encasulated (wrapped) exception, or null if there is no inner
	 *         exception.
	 * @preconditions
	 * @postconditions
	 */
	public Exception getEncapsulatedException() {
		return encapsulatedException_;
	}

	/**
	 * Returns the string representation of this exception, including the string
	 * representation of the wrapped (encapsulated) exception.
	 *
	 * @return The string representation of exception.
	 */
	public String toString() {
		StringBuffer buffer = new StringBuffer(super.toString());

		if (encapsulatedException_ != null) {
			buffer.append(", Encasulated Exception: ");
			buffer.append(encapsulatedException_.toString());
		}

		return buffer.toString();
	}

}