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| """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 raise | |
| 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 raise 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 raised, 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.""" | |