--- /dev/null
+"""
+This file is part of notmuch.
+
+Notmuch is free software: you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation, either version 3 of the License, or (at your
+option) any later version.
+
+Notmuch is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with notmuch. If not, see <http://www.gnu.org/licenses/>.
+
+Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>
+"""
+
+from ctypes import c_char_p, c_int
+
+from .globals import (
+ nmlib,
+ Enum,
+ Python3StringMixIn,
+)
+
+class Status(Enum):
+ """Enum with a string representation of a notmuch_status_t value."""
+ _status2str = nmlib.notmuch_status_to_string
+ _status2str.restype = c_char_p
+ _status2str.argtypes = [c_int]
+
+ def __init__(self, statuslist):
+ """It is initialized with a list of strings that are available as
+ Status().string1 - Status().stringn attributes.
+ """
+ super(Status, self).__init__(statuslist)
+
+ @classmethod
+ def status2str(self, status):
+ """Get a (unicode) string representation of a notmuch_status_t value."""
+ # define strings for custom error messages
+ if status == STATUS.NOT_INITIALIZED:
+ return "Operation on uninitialized object impossible."
+ return unicode(Status._status2str(status))
+
+STATUS = Status(['SUCCESS',
+ 'OUT_OF_MEMORY',
+ 'READ_ONLY_DATABASE',
+ 'XAPIAN_EXCEPTION',
+ 'FILE_ERROR',
+ 'FILE_NOT_EMAIL',
+ 'DUPLICATE_MESSAGE_ID',
+ 'NULL_POINTER',
+ 'TAG_TOO_LONG',
+ 'UNBALANCED_FREEZE_THAW',
+ 'UNBALANCED_ATOMIC',
+ 'NOT_INITIALIZED'])
+"""STATUS is a class, whose attributes provide constants that serve as return
+indicators for notmuch functions. Currently the following ones are defined. For
+possible return values and specific meaning for each method, see the method
+description.
+
+ * SUCCESS
+ * OUT_OF_MEMORY
+ * READ_ONLY_DATABASE
+ * XAPIAN_EXCEPTION
+ * FILE_ERROR
+ * FILE_NOT_EMAIL
+ * DUPLICATE_MESSAGE_ID
+ * NULL_POINTER
+ * TAG_TOO_LONG
+ * UNBALANCED_FREEZE_THAW
+ * UNBALANCED_ATOMIC
+ * NOT_INITIALIZED
+
+Invoke the class method `notmuch.STATUS.status2str` with a status value as
+argument to receive a human readable string"""
+STATUS.__name__ = 'STATUS'
+
+
+class NotmuchError(Exception, Python3StringMixIn):
+ """Is initiated with a (notmuch.STATUS[, message=None]). It will not
+ return an instance of the class NotmuchError, but a derived instance
+ of a more specific Error Message, e.g. OutOfMemoryError. Each status
+ but SUCCESS has a corresponding subclassed Exception."""
+
+ @classmethod
+ def get_exc_subclass(cls, status):
+ """Returns a fine grained Exception() type,
+ detailing the error status"""
+ subclasses = {
+ STATUS.OUT_OF_MEMORY: OutOfMemoryError,
+ STATUS.READ_ONLY_DATABASE: ReadOnlyDatabaseError,
+ STATUS.XAPIAN_EXCEPTION: XapianError,
+ STATUS.FILE_ERROR: FileError,
+ STATUS.FILE_NOT_EMAIL: FileNotEmailError,
+ STATUS.DUPLICATE_MESSAGE_ID: DuplicateMessageIdError,
+ STATUS.NULL_POINTER: NullPointerError,
+ STATUS.TAG_TOO_LONG: TagTooLongError,
+ STATUS.UNBALANCED_FREEZE_THAW: UnbalancedFreezeThawError,
+ STATUS.UNBALANCED_ATOMIC: UnbalancedAtomicError,
+ STATUS.NOT_INITIALIZED: NotInitializedError,
+ }
+ assert 0 < status <= len(subclasses)
+ return subclasses[status]
+
+ def __new__(cls, *args, **kwargs):
+ """Return a correct subclass of NotmuchError if needed
+
+ We return a NotmuchError instance if status is None (or 0) and a
+ subclass that inherits from NotmuchError depending on the
+ 'status' parameter otherwise."""
+ # get 'status'. Passed in as arg or kwarg?
+ status = args[0] if len(args) else kwargs.get('status', None)
+ # no 'status' or cls is subclass already, return 'cls' instance
+ if not status or cls != NotmuchError:
+ return super(NotmuchError, cls).__new__(cls)
+ subclass = cls.get_exc_subclass(status) # which class to use?
+ return subclass.__new__(subclass, *args, **kwargs)
+
+ def __init__(self, status=None, message=None):
+ self.status = status
+ self.message = message
+
+ def __unicode__(self):
+ if self.message is not None:
+ return self.message
+ elif self.status is not None:
+ return STATUS.status2str(self.status)
+ else:
+ return 'Unknown error'
+
+
+# List of Subclassed exceptions that correspond to STATUS values and are
+# subclasses of NotmuchError.
+class OutOfMemoryError(NotmuchError):
+ status = STATUS.OUT_OF_MEMORY
+
+
+class ReadOnlyDatabaseError(NotmuchError):
+ status = STATUS.READ_ONLY_DATABASE
+
+
+class XapianError(NotmuchError):
+ status = STATUS.XAPIAN_EXCEPTION
+
+
+class FileError(NotmuchError):
+ status = STATUS.FILE_ERROR
+
+
+class FileNotEmailError(NotmuchError):
+ status = STATUS.FILE_NOT_EMAIL
+
+
+class DuplicateMessageIdError(NotmuchError):
+ status = STATUS.DUPLICATE_MESSAGE_ID
+
+
+class NullPointerError(NotmuchError):
+ status = STATUS.NULL_POINTER
+
+
+class TagTooLongError(NotmuchError):
+ status = STATUS.TAG_TOO_LONG
+
+
+class UnbalancedFreezeThawError(NotmuchError):
+ status = STATUS.UNBALANCED_FREEZE_THAW
+
+
+class UnbalancedAtomicError(NotmuchError):
+ status = STATUS.UNBALANCED_ATOMIC
+
+
+class NotInitializedError(NotmuchError):
+ """Derived from NotmuchError, this occurs if the underlying data
+ structure (e.g. database is not initialized (yet) or an iterator has
+ been exhausted. You can test for NotmuchError with .status =
+ STATUS.NOT_INITIALIZED"""
+ status = STATUS.NOT_INITIALIZED
projects / notmuch / blobdiff