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/*
 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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// SAX exception class.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: SAXException.java,v 1.3 2004/11/03 22:55:32 jsuttor Exp $

package org.xml.sax;

import java.io.IOException;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;


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 SAXParseException subclass.


Author:David Megginson
See Also:
Since:1.4, SAX 1.0
Version:2.0.1 (sax2r2)
/**
 * Encapsulate a general SAX error or warning.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
 * for further information.
 * </blockquote>
 *
 * <p>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.</p>
 *
 * <p>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.</p>
 *
 * <p>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.</p>
 *
 * @since 1.4, 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.

/**
     * Create a new SAXException.
     */
    public SAXException ()
    {
        super();
    }


    
Create a new SAXException.

Params:
  • message – The error or warning message.
/**
     * Create a new SAXException.
     *
     * @param message The error or warning message.
     */
    public SAXException (String message) {
        super(message);
    }


    
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.


Params:
  • e – The exception to be wrapped in a SAXException.
/**
     * Create a new SAXException wrapping an existing exception.
     *
     * <p>The existing exception will be embedded in the new
     * one, and its message will become the default message for
     * the SAXException.</p>
     *
     * @param e The exception to be wrapped in a SAXException.
     */
    public SAXException (Exception e)
    {
        super(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.


Params:
  • message – The detail message.
  • e – The exception to be wrapped in a SAXException.
/**
     * Create a new SAXException from an existing exception.
     *
     * <p>The existing exception will be embedded in the new
     * one, but the new exception will have its own message.</p>
     *
     * @param message The detail message.
     * @param e The exception to be wrapped in a SAXException.
     */
    public SAXException (String message, Exception e)
    {
        super(message, 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.


Returns:The error or warning message.
/**
     * Return a detail message for this exception.
     *
     * <p>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.</p>
     *
     * @return The error or warning message.
     */
    public String getMessage ()
    {
        String message = super.getMessage();
        Throwable cause = super.getCause();

        if (message == null && cause != null) {
            return cause.getMessage();
        } else {
            return message;
        }
    }

    
Return the embedded exception, if any.

Returns:The embedded exception, or null if there is none.
/**
     * Return the embedded exception, if any.
     *
     * @return The embedded exception, or null if there is none.
     */
    public Exception getException ()
    {
        return getExceptionInternal();
    }

    
Return the cause of the exception

Returns:Return the cause of the exception
/**
     * Return the cause of the exception
     *
     * @return Return the cause of the exception
     */
    public Throwable getCause() {
        return super.getCause();
    }

    
Override toString to pick up any embedded exception.

Returns:A string representation of this exception.
/**
     * Override toString to pick up any embedded exception.
     *
     * @return A string representation of this exception.
     */
    public String toString ()
    {
        Throwable exception = super.getCause();
        if (exception != null) {
            return super.toString() + "\n" + exception.toString();
        } else {
            return super.toString();
        }
    }



    //////////////////////////////////////////////////////////////////////
    // Internal state.
    //////////////////////////////////////////////////////////////////////

    private static final ObjectStreamField[] serialPersistentFields = {
        new ObjectStreamField( "exception", Exception.class )
    };

    
Writes "exception" field to the stream.

Params:
  • out – stream used for serialization.
Throws:
/**
     * Writes "exception" field to the stream.
     *
     * @param out stream used for serialization.
     * @throws IOException thrown by <code>ObjectOutputStream</code>
     */
    private void writeObject(ObjectOutputStream out)
            throws IOException {
        ObjectOutputStream.PutField fields = out.putFields();
        fields.put("exception", getExceptionInternal());
        out.writeFields();
    }

    
Reads the "exception" field from the stream.
And initializes the "exception" if it wasn't
done before.

Params:
  • in – stream used for deserialization
Throws:
/**
     * Reads the "exception" field from the stream.
     * And initializes the "exception" if it wasn't
     * done before.
     *
     * @param in stream used for deserialization
     * @throws IOException            thrown by <code>ObjectInputStream</code>
     * @throws ClassNotFoundException thrown by <code>ObjectInputStream</code>
     */
    private void readObject(ObjectInputStream in)
            throws IOException, ClassNotFoundException {
        ObjectInputStream.GetField fields = in.readFields();
        Exception exception = (Exception) fields.get("exception", null);
        Throwable superCause = super.getCause();

        // if super.getCause() and 'exception' fields present then always use
        // getCause() value. Otherwise, use 'exception' to initialize cause
        if (superCause == null && exception != null) {
            try {
                super.initCause(exception);
            } catch (IllegalStateException e) {
                throw new InvalidClassException("Inconsistent state: two causes");
            }
        }
    }

    // Internal method to guard against overriding of public getException
    // method by SAXException subclasses
    private Exception getExceptionInternal() {
        Throwable cause = super.getCause();
        if (cause instanceof Exception) {
            return (Exception) cause;
        } else {
            return null;
        }
    }

    // Added serialVersionUID to preserve binary compatibility
    static final long serialVersionUID = 583241635256073760L;
}

// end of SAXException.java