# errors.py -- errors for dulwich
# Copyright (C) 2007 James Westby <jw+debian@jameswestby.net>
# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>
# 
# This program 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; version 2
# or (at your option) any later version of the License.
# 
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA  02110-1301, USA.

"""Dulwich-related exception classes and utility functions."""

class ChecksumMismatch(Exception):
    """A checksum didn't match the expected contents."""

    def __init__(self, expected, got, extra=None):
        self.expected = expected
        self.got = got
        self.extra = extra
        if self.extra is None:
            Exception.__init__(self, 
                "Checksum mismatch: Expected %s, got %s" % (expected, got))
        else:
            Exception.__init__(self,
                "Checksum mismatch: Expected %s, got %s; %s" % 
                (expected, got, extra))


class WrongObjectException(Exception):
    """Baseclass for all the _ is not a _ exceptions on objects.
  
    Do not instantiate directly.
  
    Subclasses should define a _type attribute that indicates what
    was expected if they were raised.
    """
  
    def __init__(self, sha, *args, **kwargs):
        string = "%s is not a %s" % (sha, self._type)
        Exception.__init__(self, string)


class NotCommitError(WrongObjectException):
    """Indicates that the sha requested does not point to a commit."""
  
    _type = 'commit'


class NotTreeError(WrongObjectException):
    """Indicates that the sha requested does not point to a tree."""
  
    _type = 'tree'


class NotBlobError(WrongObjectException):
    """Indicates that the sha requested does not point to a blob."""
  
    _type = 'blob'


class MissingCommitError(Exception):
    """Indicates that a commit was not found in the repository"""
  
    def __init__(self, sha, *args, **kwargs):
        Exception.__init__(self, "%s is not in the revision store" % sha)


class ObjectMissing(Exception):
    """Indicates that a requested object is missing."""
  
    def __init__(self, sha, *args, **kwargs):
        Exception.__init__(self, "%s is not in the pack" % sha)


class ApplyDeltaError(Exception):
    """Indicates that applying a delta failed."""
    
    def __init__(self, *args, **kwargs):
        Exception.__init__(self, *args, **kwargs)


class NotGitRepository(Exception):
    """Indicates that no Git repository was found."""

    def __init__(self, *args, **kwargs):
        Exception.__init__(self, *args, **kwargs)


class GitProtocolError(Exception):
    """Git protocol exception."""
    
    def __init__(self, *args, **kwargs):
        Exception.__init__(self, *args, **kwargs)


class HangupException(GitProtocolError):
    """Hangup exception."""