/*
 * Copyright (c) 1999 World Wide Web Consortium
 * (Massachusetts Institute of Technology, Institut National de Recherche
 *  en Informatique et en Automatique, Keio University).
 * All Rights Reserved. http://www.w3.org/Consortium/Legal/
 *
 * The original version of this interface comes from SAX :
 * http://www.megginson.com/SAX/
 *
 * $Id: CSSException.java 477010 2006-11-20 02:54:38Z mrglavas $
 */
package org.w3c.css.sac;


/**
 * The Class CSSException.
 *
 * @author Philippe Le Hegaret
 * @version $Revision: 477010 $
 */
public class CSSException extends RuntimeException {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/** The s. */
	protected String s;

	/**
	 * this error is unspecified.
	 */
	public static final short SAC_UNSPECIFIED_ERR = 0;

	/** If the operation is not supported. */
	public static final short SAC_NOT_SUPPORTED_ERR = 1;

	/** If an invalid or illegal string is specified. */
	public static final short SAC_SYNTAX_ERR = 2;

	/*
	 * Default message for unspecified error.
	 */
	/** The Constant S_SAC_UNSPECIFIED_ERR. */
	protected static final String S_SAC_UNSPECIFIED_ERR = "unknown error";
	/*
	 * Default message for not supported error.
	 */
	/** The Constant S_SAC_NOT_SUPPORTED_ERR. */
	protected static final String S_SAC_NOT_SUPPORTED_ERR = "not supported";
	/*
	 * Default message for syntax error.
	 */
	/** The Constant S_SAC_SYNTAX_ERR. */
	protected static final String S_SAC_SYNTAX_ERR = "syntax error";

	/**
	 * The internal exception.
	 */
	protected Exception e;

	/** The code. */
	protected short code;

	/**
	 * Creates a new CSSException.
	 */
	public CSSException() {
	}

	/**
	 * Creates a new CSSException.
	 *
	 * @param s the s
	 */
	public CSSException(String s) {
		this.code = SAC_UNSPECIFIED_ERR;
		this.s = s;
	}

	/**
	 * Creates a new CSSException with an embeded exception.
	 * 
	 * @param e
	 *            the embeded exception.
	 */
	public CSSException(Exception e) {
		this.code = SAC_UNSPECIFIED_ERR;
		this.e = e;
	}

	/**
	 * Creates a new CSSException with a specific code.
	 * 
	 * @param code
	 *            the embeded exception.
	 */
	public CSSException(short code) {
		this.code = code;
	}

	/**
	 * Creates a new CSSException with an embeded exception and a specified
	 * message.
	 *
	 * @param code            the specified code.
	 * @param s the s
	 * @param e            the embeded exception.
	 */
	public CSSException(short code, String s, Exception e) {
		this.code = code;
		this.s = s;
		this.e = e;
	}

	/**
	 * Returns the detail message of this throwable object.
	 *
	 * @return the detail message of this Throwable, or null if this Throwable
	 *         does not have a detail message.
	 */
	public String getMessage() {
		if (s != null) {
			return s;
		} else if (e != null) {
			return e.getMessage();
		} else {
			switch (code) {
			case SAC_UNSPECIFIED_ERR:
				return S_SAC_UNSPECIFIED_ERR;
			case SAC_NOT_SUPPORTED_ERR:
				return S_SAC_NOT_SUPPORTED_ERR;
			case SAC_SYNTAX_ERR:
				return S_SAC_SYNTAX_ERR;
			default:
				return null;
			}
		}
	}

	/**
	 * returns the error code for this exception.
	 *
	 * @return the code
	 */
	public short getCode() {
		return code;
	}

	/**
	 * Returns the internal exception if any, null otherwise.
	 *
	 * @return the exception
	 */
	public Exception getException() {
		return e;
	}

}