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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* published by the Free Software Foundation. Oracle designates this
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*
* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.xml.sax;
/**
* Basic interface for SAX error handlers.
*
* <p>If a SAX application needs to implement customized error
* handling, it must implement this interface and then register an
* instance with the XML reader using the
* {@link org.xml.sax.XMLReader#setErrorHandler setErrorHandler}
* method. The parser will then report all errors and warnings
* through this interface.</p>
*
* <p><strong>WARNING:</strong> If an application does <em>not</em>
* register an ErrorHandler, XML parsing errors will go unreported,
* except that <em>SAXParseException</em>s will be thrown for fatal errors.
* In order to detect validity errors, an ErrorHandler that does something
* with {@link #error error()} calls must be registered.</p>
*
* <p>For XML processing errors, a SAX driver must use this interface
* in preference to 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 there is no requirement that
* the parser continue to report additional errors after a call to
* {@link #fatalError fatalError}. In other words, a SAX driver class
* may throw an exception after reporting any fatalError.
* Also parsers may throw appropriate exceptions for non-XML errors.
* For example, {@link XMLReader#parse XMLReader.parse()} would throw
* an IOException for errors accessing entities or the document.</p>
*
* @since 1.4, SAX 1.0
* @author David Megginson
* @see org.xml.sax.XMLReader#setErrorHandler
* @see org.xml.sax.SAXParseException
*/
public interface ErrorHandler {
/**
* Receive notification of a warning.
*
* <p>SAX parsers will use this method to report conditions that
* are not errors or fatal errors as defined by the XML
* recommendation. The default behaviour is to take no
* action.</p>
*
* <p>The SAX parser must continue to provide normal parsing events
* after invoking this method: it should still be possible for the
* application to process the document through to the end.</p>
*
* <p>Filters may use this method to report other, non-XML warnings
* as well.</p>
*
* @param exception The warning information encapsulated in a
* SAX parse exception.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.SAXParseException
*/
public abstract void warning (SAXParseException exception)
throws SAXException;
/**
* Receive notification of a recoverable error.
*
* <p>This corresponds to the definition of "error" in section 1.2
* of the W3C XML 1.0 Recommendation. For example, a validating
* parser would use this callback to report the violation of a
* validity constraint. The default behaviour is to take no
* action.</p>
*
* <p>The SAX parser must continue to provide normal parsing
* events after invoking this method: it should still be possible
* for the application to process the document through to the end.
* If the application cannot do so, then the parser should report
* a fatal error even if the XML recommendation does not require
* it to do so.</p>
*
* <p>Filters may use this method to report other, non-XML errors
* as well.</p>
*
* @param exception The error information encapsulated in a
* SAX parse exception.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.SAXParseException
*/
public abstract void error (SAXParseException exception)
throws SAXException;
/**
* Receive notification of a non-recoverable, fatal error.
*
* <p>
* As defined in section 1.2 of the W3C XML 1.0 Recommendation, fatal errors
* are those that would make it impossible for a parser to continue normal
* processing. These include violation of a well-formedness constraint,
* invalid encoding, and forbidden structural errors as described in the
* W3C XML 1.0 Recommendation.
*
* @apiNote An application must assume that the parser can no longer perform
* normal processing after reporting a fatal error and may stop by throwing
* a {@link SAXException} without calling {@link ContentHandler#endDocument()}.
* In addition, the parser cannot be expected to be able to return accurate
* information about the logical structure on the rest of the document even
* if it may be able to resume parsing.
*
* @implNote After invoking this method, the parser may stop processing by
* throwing a {@link SAXException}, or implement a feature that can direct
* it to continue after a fatal error. In the later case, it may report
* events on the rest of the document without any guarantee of correctness.
*
* @param exception The error information encapsulated in a
* {@link SAXParseException}.
* @throws SAXException if the application chooses to discontinue the parsing
*/
public abstract void fatalError (SAXParseException exception)
throws SAXException;
}
// end of ErrorHandler.java