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 * Copyright (c) 2000, 2005, 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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package javax.xml.transform;


To provide customized error handling, implement this interface and
use the setErrorListener method to register an instance of the implementation with the Transformer. The Transformer then reports all errors and warnings through this
interface.


If an application does not register its own custom
ErrorListener, the default ErrorListener
is used which reports all warnings and errors to System.err
and does not throw any Exceptions.
Applications are strongly encouraged to register and use
ErrorListeners that insure proper behavior for warnings and
errors.


For transformation errors, a Transformer must use this
interface instead of throwing an Exception: it is up to the
application to decide whether to throw an Exception for
different types of errors and warnings.  Note however that the
Transformer is not required to continue with the transformation after a call to fatalError(TransformerException exception).


Transformers may use this mechanism to report XML parsing
errors as well as transformation errors.


Since:1.4
/**
 * <p>To provide customized error handling, implement this interface and
 * use the <code>setErrorListener</code> method to register an instance of the
 * implementation with the {@link javax.xml.transform.Transformer}.  The
 * <code>Transformer</code> then reports all errors and warnings through this
 * interface.</p>
 *
 * <p>If an application does <em>not</em> register its own custom
 * <code>ErrorListener</code>, the default <code>ErrorListener</code>
 * is used which reports all warnings and errors to <code>System.err</code>
 * and does not throw any <code>Exception</code>s.
 * Applications are <em>strongly</em> encouraged to register and use
 * <code>ErrorListener</code>s that insure proper behavior for warnings and
 * errors.</p>
 *
 * <p>For transformation errors, a <code>Transformer</code> must use this
 * interface instead of throwing an <code>Exception</code>: it is up to the
 * application to decide whether to throw an <code>Exception</code> for
 * different types of errors and warnings.  Note however that the
 * <code>Transformer</code> is not required to continue with the transformation
 * after a call to {@link #fatalError(TransformerException exception)}.</p>
 *
 * <p><code>Transformer</code>s may use this mechanism to report XML parsing
 * errors as well as transformation errors.</p>
 *
 * @since 1.4
 */
public interface ErrorListener {

    
Receive notification of a warning.

Transformer can use this method to report conditions that are not errors or fatal errors. The default behaviour is to take no action.


After invoking this method, the Transformer must continue with
the transformation. It should still be possible for the
application to process the document through to the end.


Params:
  • exception – The warning information encapsulated in a
                 transformer exception.
Throws:
See Also:
/**
     * Receive notification of a warning.
     *
     * <p>{@link javax.xml.transform.Transformer} can use this method to report
     * conditions that are not errors or fatal errors.  The default behaviour
     * is to take no action.</p>
     *
     * <p>After invoking this method, the Transformer must continue with
     * the transformation. It should still be possible for the
     * application to process the document through to the end.</p>
     *
     * @param exception The warning information encapsulated in a
     *                  transformer exception.
     *
     * @throws javax.xml.transform.TransformerException if the application
     * chooses to discontinue the transformation.
     *
     * @see javax.xml.transform.TransformerException
     */
    public abstract void warning(TransformerException exception)
        throws TransformerException;

    
Receive notification of a recoverable error.

The transformer must continue to try and provide normal transformation
after invoking this method.  It should still be possible for the
application to process the document through to the end if no other errors
are encountered.


Params:
  • exception – The error information encapsulated in a
                 transformer exception.
Throws:
See Also:
/**
     * Receive notification of a recoverable error.
     *
     * <p>The transformer must continue to try and provide normal transformation
     * after invoking this method.  It should still be possible for the
     * application to process the document through to the end if no other errors
     * are encountered.</p>
     *
     * @param exception The error information encapsulated in a
     *                  transformer exception.
     *
     * @throws javax.xml.transform.TransformerException if the application
     * chooses to discontinue the transformation.
     *
     * @see javax.xml.transform.TransformerException
     */
    public abstract void error(TransformerException exception)
        throws TransformerException;

    
Receive notification of a non-recoverable error.


The processor may choose to continue, but will not normally
proceed to a successful completion.


The method should throw an exception if it is unable to
process the error, or if it wishes execution to terminate
immediately. The processor will not necessarily honor this
request.


Params:
  • exception – The error information encapsulated in a
   TransformerException.
Throws:
See Also:
/**
     * <p>Receive notification of a non-recoverable error.</p>
     *
     * <p>The processor may choose to continue, but will not normally
     * proceed to a successful completion.</p>
     *
     * <p>The method should throw an exception if it is unable to
     * process the error, or if it wishes execution to terminate
     * immediately. The processor will not necessarily honor this
     * request.</p>
     *
     * @param exception The error information encapsulated in a
     *    <code>TransformerException</code>.
     *
     * @throws javax.xml.transform.TransformerException if the application
     * chooses to discontinue the transformation.
     *
     * @see javax.xml.transform.TransformerException
     */
    public abstract void fatalError(TransformerException exception)
        throws TransformerException;
}