| """Different kinds of SAX Exceptions""" |
| import sys |
| if sys.platform[:4] == "java": |
| from java.lang import Exception |
| del sys |
| |
| # ===== SAXEXCEPTION ===== |
| |
| class SAXException(Exception): |
| """Encapsulate an XML error or warning. This class can contain |
| basic error or warning information from either the XML parser or |
| the application: you can subclass it to provide additional |
| functionality, or to add localization. Note that although you will |
| receive a SAXException as the argument to the handlers in the |
| ErrorHandler interface, you are not actually required to throw |
| the exception; instead, you can simply read the information in |
| it.""" |
| |
| def __init__(self, msg, exception=None): |
| """Creates an exception. The message is required, but the exception |
| is optional.""" |
| self._msg = msg |
| self._exception = exception |
| Exception.__init__(self, msg) |
| |
| def getMessage(self): |
| "Return a message for this exception." |
| return self._msg |
| |
| def getException(self): |
| "Return the embedded exception, or None if there was none." |
| return self._exception |
| |
| def __str__(self): |
| "Create a string representation of the exception." |
| return self._msg |
| |
| def __getitem__(self, ix): |
| """Avoids weird error messages if someone does exception[ix] by |
| mistake, since Exception has __getitem__ defined.""" |
| raise AttributeError("__getitem__") |
| |
| |
| # ===== SAXPARSEEXCEPTION ===== |
| |
| class SAXParseException(SAXException): |
| """Encapsulate an XML parse error or warning. |
| |
| This exception will include information for locating the error in |
| the original XML document. Note that although the application will |
| receive a SAXParseException as the argument to the handlers in the |
| ErrorHandler interface, the application is not actually required |
| to throw the exception; instead, it can simply read the |
| information in it and take a different action. |
| |
| Since this exception is a subclass of SAXException, it inherits |
| the ability to wrap another exception.""" |
| |
| def __init__(self, msg, exception, locator): |
| "Creates the exception. The exception parameter is allowed to be None." |
| SAXException.__init__(self, msg, exception) |
| self._locator = locator |
| |
| # We need to cache this stuff at construction time. |
| # If this exception is thrown, the objects through which we must |
| # traverse to get this information may be deleted by the time |
| # it gets caught. |
| self._systemId = self._locator.getSystemId() |
| self._colnum = self._locator.getColumnNumber() |
| self._linenum = self._locator.getLineNumber() |
| |
| def getColumnNumber(self): |
| """The column number of the end of the text where the exception |
| occurred.""" |
| return self._colnum |
| |
| def getLineNumber(self): |
| "The line number of the end of the text where the exception occurred." |
| return self._linenum |
| |
| def getPublicId(self): |
| "Get the public identifier of the entity where the exception occurred." |
| return self._locator.getPublicId() |
| |
| def getSystemId(self): |
| "Get the system identifier of the entity where the exception occurred." |
| return self._systemId |
| |
| def __str__(self): |
| "Create a string representation of the exception." |
| sysid = self.getSystemId() |
| if sysid is None: |
| sysid = "<unknown>" |
| linenum = self.getLineNumber() |
| if linenum is None: |
| linenum = "?" |
| colnum = self.getColumnNumber() |
| if colnum is None: |
| colnum = "?" |
| return "%s:%s:%s: %s" % (sysid, linenum, colnum, self._msg) |
| |
| |
| # ===== SAXNOTRECOGNIZEDEXCEPTION ===== |
| |
| class SAXNotRecognizedException(SAXException): |
| """Exception class for an unrecognized identifier. |
| |
| An XMLReader will raise this exception when it is confronted with an |
| unrecognized feature or property. SAX applications and extensions may |
| use this class for similar purposes.""" |
| |
| |
| # ===== SAXNOTSUPPORTEDEXCEPTION ===== |
| |
| class SAXNotSupportedException(SAXException): |
| """Exception class for an unsupported operation. |
| |
| An XMLReader will raise this exception when a service it cannot |
| perform is requested (specifically setting a state or value). SAX |
| applications and extensions may use this class for similar |
| purposes.""" |
| |
| # ===== SAXNOTSUPPORTEDEXCEPTION ===== |
| |
| class SAXReaderNotAvailable(SAXNotSupportedException): |
| """Exception class for a missing driver. |
| |
| An XMLReader module (driver) should raise this exception when it |
| is first imported, e.g. when a support module cannot be imported. |
| It also may be raised during parsing, e.g. if executing an external |
| program is not permitted.""" |