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package com.sun.org.apache.xerces.internal.xni.parser;

import com.sun.org.apache.xerces.internal.xni.XNIException;

/**
 * An interface for handling errors. If the application is interested
 * in error notifications, then it can register an error handler object
 * that implements this interface with the parser configuration.
 *
 * @see XMLParserConfiguration
 *
 * @author Andy Clark, IBM
 *
 * @version $Id: XMLErrorHandler.java,v 1.6 2010-11-01 04:40:22 joehw Exp $
 */
public interface XMLErrorHandler {

    //
    // XMLErrorHandler methods
    //

    /**
     * Reports a warning. Warnings are non-fatal and can be safely ignored
     * by most applications.
     *
     * @param domain    The domain of the warning. The domain can be any
     *                  string but is suggested to be a valid URI. The
     *                  domain can be used to conveniently specify a web
     *                  site location of the relevent specification or
     *                  document pertaining to this warning.
     * @param key       The warning key. This key can be any string and
     *                  is implementation dependent.
     * @param exception Exception.
     *
     * @throws XNIException Thrown to signal that the parser should stop
     *                      parsing the document.
     */
    public void warning(String domain, String key, 
                        XMLParseException exception) throws XNIException;

    /**
     * Reports an error. Errors are non-fatal and usually signify that the
     * document is invalid with respect to its grammar(s).
     *
     * @param domain    The domain of the error. The domain can be any
     *                  string but is suggested to be a valid URI. The
     *                  domain can be used to conveniently specify a web
     *                  site location of the relevent specification or
     *                  document pertaining to this error.
     * @param key       The error key. This key can be any string and
     *                  is implementation dependent.
     * @param exception Exception.
     *
     * @throws XNIException Thrown to signal that the parser should stop
     *                      parsing the document.
     */
    public void error(String domain, String key, 
                      XMLParseException exception) throws XNIException;

    /**
     * Report a fatal error. Fatal errors usually occur when the document
     * is not well-formed and signifies that the parser cannot continue
     * normal operation.
     * 
     * Note: The error handler should always
     * throw an XNIException from this method. This exception
     * can either be the same exception that is passed as a parameter to
     * the method or a new XNI exception object. If the registered error
     * handler fails to throw an exception, the continuing operation of
     * the parser is undetermined.
     *
     * @param domain    The domain of the fatal error. The domain can be 
     *                  any string but is suggested to be a valid URI. The
     *                  domain can be used to conveniently specify a web
     *                  site location of the relevent specification or
     *                  document pertaining to this fatal error.
     * @param key       The fatal error key. This key can be any string 
     *                  and is implementation dependent.
     * @param exception Exception.
     *
     * @throws XNIException Thrown to signal that the parser should stop
     *                      parsing the document.
     */
    public void fatalError(String domain, String key, 
                           XMLParseException exception) throws XNIException;

} // interface XMLErrorHandler