Source Code Cross Referenced for ErrorHandler.java in  » Science » javolution-5.2 » org » xml » sax » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » javolution 5.2 » org.xml.sax 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // SAX error handler.
002:        // http://www.saxproject.org
003:        // No warranty; no copyright -- use this as you will.
004:
005:        package org.xml.sax;
006:
007:        /**
008:         * Basic interface for SAX error handlers.
009:         *
010:         * <blockquote>
011:         * <em>This module, both source code and documentation, is in the
012:         * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
013:         * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
014:         * for further information.
015:         * </blockquote>
016:         *
017:         * <p>If a SAX application needs to implement customized error
018:         * handling, it must implement this interface and then register an
019:         * instance with the XML reader using the
020:         * {@link org.xml.sax.XMLReader#setErrorHandler setErrorHandler}
021:         * method.  The parser will then report all errors and warnings
022:         * through this interface.</p>
023:         *
024:         * <p><strong>WARNING:</strong> If an application does <em>not</em>
025:         * register an ErrorHandler, XML parsing errors will go unreported,
026:         * except that <em>SAXParseException</em>s will be thrown for fatal errors.
027:         * In order to detect validity errors, an ErrorHandler that does something
028:         * with {@link #error error()} calls must be registered.</p>
029:         *
030:         * <p>For XML processing errors, a SAX driver must use this interface 
031:         * in preference to throwing an exception: it is up to the application 
032:         * to decide whether to throw an exception for different types of 
033:         * errors and warnings.  Note, however, that there is no requirement that 
034:         * the parser continue to report additional errors after a call to 
035:         * {@link #fatalError fatalError}.  In other words, a SAX driver class 
036:         * may throw an exception after reporting any fatalError.
037:         * Also parsers may throw appropriate exceptions for non-XML errors.
038:         * For example, {@link XMLReader#parse XMLReader.parse()} would throw
039:         * an IOException for errors accessing entities or the document.</p>
040:         *
041:         * @since SAX 1.0
042:         * @author David Megginson
043:         * @version 2.0.1+ (sax2r3pre1)
044:         * @see org.xml.sax.XMLReader#setErrorHandler
045:         * @see org.xml.sax.SAXParseException 
046:         */
047:        public interface ErrorHandler {
048:
049:            /**
050:             * Receive notification of a warning.
051:             *
052:             * <p>SAX parsers will use this method to report conditions that
053:             * are not errors or fatal errors as defined by the XML
054:             * recommendation.  The default behaviour is to take no
055:             * action.</p>
056:             *
057:             * <p>The SAX parser must continue to provide normal parsing events
058:             * after invoking this method: it should still be possible for the
059:             * application to process the document through to the end.</p>
060:             *
061:             * <p>Filters may use this method to report other, non-XML warnings
062:             * as well.</p>
063:             *
064:             * @param exception The warning information encapsulated in a
065:             *                  SAX parse exception.
066:             * @exception org.xml.sax.SAXException Any SAX exception, possibly
067:             *            wrapping another exception.
068:             * @see org.xml.sax.SAXParseException 
069:             */
070:            public abstract void warning(SAXParseException exception)
071:                    throws SAXException;
072:
073:            /**
074:             * Receive notification of a recoverable error.
075:             *
076:             * <p>This corresponds to the definition of "error" in section 1.2
077:             * of the W3C XML 1.0 Recommendation.  For example, a validating
078:             * parser would use this callback to report the violation of a
079:             * validity constraint.  The default behaviour is to take no
080:             * action.</p>
081:             *
082:             * <p>The SAX parser must continue to provide normal parsing
083:             * events after invoking this method: it should still be possible
084:             * for the application to process the document through to the end.
085:             * If the application cannot do so, then the parser should report
086:             * a fatal error even if the XML recommendation does not require
087:             * it to do so.</p>
088:             *
089:             * <p>Filters may use this method to report other, non-XML errors
090:             * as well.</p>
091:             *
092:             * @param exception The error information encapsulated in a
093:             *                  SAX parse exception.
094:             * @exception org.xml.sax.SAXException Any SAX exception, possibly
095:             *            wrapping another exception.
096:             * @see org.xml.sax.SAXParseException 
097:             */
098:            public abstract void error(SAXParseException exception)
099:                    throws SAXException;
100:
101:            /**
102:             * Receive notification of a non-recoverable error.
103:             *
104:             * <p><strong>There is an apparent contradiction between the
105:             * documentation for this method and the documentation for {@link
106:             * org.xml.sax.ContentHandler#endDocument}.  Until this ambiguity
107:             * is resolved in a future major release, clients should make no
108:             * assumptions about whether endDocument() will or will not be
109:             * invoked when the parser has reported a fatalError() or thrown
110:             * an exception.</strong></p>
111:             *
112:             * <p>This corresponds to the definition of "fatal error" in
113:             * section 1.2 of the W3C XML 1.0 Recommendation.  For example, a
114:             * parser would use this callback to report the violation of a
115:             * well-formedness constraint.</p>
116:             *
117:             * <p>The application must assume that the document is unusable
118:             * after the parser has invoked this method, and should continue
119:             * (if at all) only for the sake of collecting additional error
120:             * messages: in fact, SAX parsers are free to stop reporting any
121:             * other events once this method has been invoked.</p>
122:             *
123:             * @param exception The error information encapsulated in a
124:             *                  SAX parse exception.  
125:             * @exception org.xml.sax.SAXException Any SAX exception, possibly
126:             *            wrapping another exception.
127:             * @see org.xml.sax.SAXParseException
128:             */
129:            public abstract void fatalError(SAXParseException exception)
130:                    throws SAXException;
131:
132:        }
133:
134:        // end of ErrorHandler.java
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