Source Code Cross Referenced for SAXException.java in  » Development » Javolution » org » xml » sax » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » Javolution » org.xml.sax 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // SAX exception class.
002:        // http://www.saxproject.org
003:        // No warranty; no copyright -- use this as you will.
004:
005:        package org.xml.sax;
006:
007:        /**
008:         * Encapsulate a general SAX error or warning.
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>This class can contain basic error or warning information from
018:         * either the XML parser or the application: a parser writer or
019:         * application writer can subclass it to provide additional
020:         * functionality.  SAX handlers may throw this exception or
021:         * any exception subclassed from it.</p>
022:         *
023:         * <p>If the application needs to pass through other types of
024:         * exceptions, it must wrap those exceptions in a SAXException
025:         * or an exception derived from a SAXException.</p>
026:         *
027:         * <p>If the parser or application needs to include information about a
028:         * specific location in an XML document, it should use the
029:         * {@link org.xml.sax.SAXParseException SAXParseException} subclass.</p>
030:         *
031:         * @since SAX 1.0
032:         * @author David Megginson
033:         * @version 2.0.1 (sax2r2)
034:         * @see org.xml.sax.SAXParseException
035:         */
036:        public class SAXException extends Exception {
037:
038:            /**
039:             * Create a new SAXException.
040:             */
041:            public SAXException() {
042:                super ();
043:                this .exception = null;
044:            }
045:
046:            /**
047:             * Create a new SAXException.
048:             *
049:             * @param message The error or warning message.
050:             */
051:            public SAXException(String message) {
052:                super (message);
053:                this .exception = null;
054:            }
055:
056:            /**
057:             * Create a new SAXException wrapping an existing exception.
058:             *
059:             * <p>The existing exception will be embedded in the new
060:             * one, and its message will become the default message for
061:             * the SAXException.</p>
062:             *
063:             * @param e The exception to be wrapped in a SAXException.
064:             */
065:            public SAXException(Exception e) {
066:                super ();
067:                this .exception = e;
068:            }
069:
070:            /**
071:             * Create a new SAXException from an existing exception.
072:             *
073:             * <p>The existing exception will be embedded in the new
074:             * one, but the new exception will have its own message.</p>
075:             *
076:             * @param message The detail message.
077:             * @param e The exception to be wrapped in a SAXException.
078:             */
079:            public SAXException(String message, Exception e) {
080:                super (message);
081:                this .exception = e;
082:            }
083:
084:            /**
085:             * Return a detail message for this exception.
086:             *
087:             * <p>If there is an embedded exception, and if the SAXException
088:             * has no detail message of its own, this method will return
089:             * the detail message from the embedded exception.</p>
090:             *
091:             * @return The error or warning message.
092:             */
093:            public String getMessage() {
094:                String message = super .getMessage();
095:
096:                if (message == null && exception != null) {
097:                    return exception.getMessage();
098:                } else {
099:                    return message;
100:                }
101:            }
102:
103:            /**
104:             * Return the embedded exception, if any.
105:             *
106:             * @return The embedded exception, or null if there is none.
107:             */
108:            public Exception getException() {
109:                return exception;
110:            }
111:
112:            /**
113:             * Override toString to pick up any embedded exception.
114:             *
115:             * @return A string representation of this exception.
116:             */
117:            public String toString() {
118:                if (exception != null) {
119:                    return exception.toString();
120:                } else {
121:                    return super .toString();
122:                }
123:            }
124:
125:            //////////////////////////////////////////////////////////////////////
126:            // Internal state.
127:            //////////////////////////////////////////////////////////////////////
128:
129:            /**
130:             * @serial The embedded exception if tunnelling, or null.
131:             */
132:            private Exception exception;
133:
134:        }
135:
136:        // end of SAXException.java
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