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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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// SAX exception class.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: SAXException.java 226184 2005-04-08 10:53:24Z neeraj $

package org.xml.sax;

/**
 * Encapsulate a general SAX error or warning.
 *
 * 
 * This module, both source code and documentation, is in the
 * Public Domain, and comes with NO WARRANTY.
 * See http://www.saxproject.org
 * for further information.
 * 
 *
 * This class can contain basic error or warning information from
 * either the XML parser or the application: a parser writer or
 * application writer can subclass it to provide additional
 * functionality.  SAX handlers may throw this exception or
 * any exception subclassed from it.
 *
 * If the application needs to pass through other types of
 * exceptions, it must wrap those exceptions in a SAXException
 * or an exception derived from a SAXException.
 *
 * If the parser or application needs to include information about a
 * specific location in an XML document, it should use the
 * {@link org.xml.sax.SAXParseException SAXParseException} subclass.
 *
 * @since SAX 1.0
 * @author David Megginson
 * @version 2.0.1 (sax2r2)
 * @see org.xml.sax.SAXParseException
 */
public class SAXException extends Exception {


    /**
     * Create a new SAXException.
     */
    public SAXException ()
    {
	super();
	this.exception = null;
    }
    
    
    /**
     * Create a new SAXException.
     *
     * @param message The error or warning message.
     */
    public SAXException (String message) {
	super(message);
	this.exception = null;
    }
    
    
    /**
     * Create a new SAXException wrapping an existing exception.
     *
     * The existing exception will be embedded in the new
     * one, and its message will become the default message for
     * the SAXException.
     *
     * @param e The exception to be wrapped in a SAXException.
     */
    public SAXException (Exception e)
    {
	super();
	this.exception = e;
    }
    
    
    /**
     * Create a new SAXException from an existing exception.
     *
     * The existing exception will be embedded in the new
     * one, but the new exception will have its own message.
     *
     * @param message The detail message.
     * @param e The exception to be wrapped in a SAXException.
     */
    public SAXException (String message, Exception e)
    {
	super(message);
	this.exception = e;
    }
    
    
    /**
     * Return a detail message for this exception.
     *
     * If there is an embedded exception, and if the SAXException
     * has no detail message of its own, this method will return
     * the detail message from the embedded exception.
     *
     * @return The error or warning message.
     */
    public String getMessage ()
    {
	String message = super.getMessage();
	
	if (message == null && exception != null) {
	    return exception.getMessage();
	} else {
	    return message;
	}
    }
    
    
    /**
     * Return the embedded exception, if any.
     *
     * @return The embedded exception, or null if there is none.
     */
    public Exception getException ()
    {
	return exception;
    }


    /**
     * Override toString to pick up any embedded exception.
     *
     * @return A string representation of this exception.
     */
    public String toString ()
    {
	if (exception != null) {
	    return exception.toString();
	} else {
	    return super.toString();
	}
    }
    
    
    
    //////////////////////////////////////////////////////////////////////
    // Internal state.
    //////////////////////////////////////////////////////////////////////


    /**
     * @serial The embedded exception if tunnelling, or null.
     */    
    private Exception exception;
    
    // Added serialVersionUID to preserve binary compatibility 
    static final long serialVersionUID = 583241635256073760L;
}

// end of SAXException.java