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1"""Different kinds of SAX Exceptions"""
2import sys
3if sys.platform[:4] == "java":
4    from java.lang import Exception
5del sys
6
7# ===== SAXEXCEPTION =====
8
9class SAXException(Exception):
10    """Encapsulate an XML error or warning. This class can contain
11    basic error or warning information from either the XML parser or
12    the application: you can subclass it to provide additional
13    functionality, or to add localization. Note that although you will
14    receive a SAXException as the argument to the handlers in the
15    ErrorHandler interface, you are not actually required to raise
16    the exception; instead, you can simply read the information in
17    it."""
18
19    def __init__(self, msg, exception=None):
20        """Creates an exception. The message is required, but the exception
21        is optional."""
22        self._msg = msg
23        self._exception = exception
24        Exception.__init__(self, msg)
25
26    def getMessage(self):
27        "Return a message for this exception."
28        return self._msg
29
30    def getException(self):
31        "Return the embedded exception, or None if there was none."
32        return self._exception
33
34    def __str__(self):
35        "Create a string representation of the exception."
36        return self._msg
37
38    def __getitem__(self, ix):
39        """Avoids weird error messages if someone does exception[ix] by
40        mistake, since Exception has __getitem__ defined."""
41        raise AttributeError("__getitem__")
42
43
44# ===== SAXPARSEEXCEPTION =====
45
46class SAXParseException(SAXException):
47    """Encapsulate an XML parse error or warning.
48
49    This exception will include information for locating the error in
50    the original XML document. Note that although the application will
51    receive a SAXParseException as the argument to the handlers in the
52    ErrorHandler interface, the application is not actually required
53    to raise the exception; instead, it can simply read the
54    information in it and take a different action.
55
56    Since this exception is a subclass of SAXException, it inherits
57    the ability to wrap another exception."""
58
59    def __init__(self, msg, exception, locator):
60        "Creates the exception. The exception parameter is allowed to be None."
61        SAXException.__init__(self, msg, exception)
62        self._locator = locator
63
64        # We need to cache this stuff at construction time.
65        # If this exception is raised, the objects through which we must
66        # traverse to get this information may be deleted by the time
67        # it gets caught.
68        self._systemId = self._locator.getSystemId()
69        self._colnum = self._locator.getColumnNumber()
70        self._linenum = self._locator.getLineNumber()
71
72    def getColumnNumber(self):
73        """The column number of the end of the text where the exception
74        occurred."""
75        return self._colnum
76
77    def getLineNumber(self):
78        "The line number of the end of the text where the exception occurred."
79        return self._linenum
80
81    def getPublicId(self):
82        "Get the public identifier of the entity where the exception occurred."
83        return self._locator.getPublicId()
84
85    def getSystemId(self):
86        "Get the system identifier of the entity where the exception occurred."
87        return self._systemId
88
89    def __str__(self):
90        "Create a string representation of the exception."
91        sysid = self.getSystemId()
92        if sysid is None:
93            sysid = "<unknown>"
94        linenum = self.getLineNumber()
95        if linenum is None:
96            linenum = "?"
97        colnum = self.getColumnNumber()
98        if colnum is None:
99            colnum = "?"
100        return "%s:%s:%s: %s" % (sysid, linenum, colnum, self._msg)
101
102
103# ===== SAXNOTRECOGNIZEDEXCEPTION =====
104
105class SAXNotRecognizedException(SAXException):
106    """Exception class for an unrecognized identifier.
107
108    An XMLReader will raise this exception when it is confronted with an
109    unrecognized feature or property. SAX applications and extensions may
110    use this class for similar purposes."""
111
112
113# ===== SAXNOTSUPPORTEDEXCEPTION =====
114
115class SAXNotSupportedException(SAXException):
116    """Exception class for an unsupported operation.
117
118    An XMLReader will raise this exception when a service it cannot
119    perform is requested (specifically setting a state or value). SAX
120    applications and extensions may use this class for similar
121    purposes."""
122
123# ===== SAXNOTSUPPORTEDEXCEPTION =====
124
125class SAXReaderNotAvailable(SAXNotSupportedException):
126    """Exception class for a missing driver.
127
128    An XMLReader module (driver) should raise this exception when it
129    is first imported, e.g. when a support module cannot be imported.
130    It also may be raised during parsing, e.g. if executing an external
131    program is not permitted."""
132