1 files changed, 53 insertions, 0 deletions

diff --git a/dodai/exception.py b/dodai/exception.py
index 5af10b4..23302c7 100644
--- a/dodai/exception.py
+++ b/dodai/exception.py
@@ -16,6 +16,7 @@
 # along with Dodai.  If not, see <http://www.gnu.org/licenses/>.
 
 from dodai.tools import list_to_english
+from dodai.tools import quote_list
 
 class DodaiException(Exception):
 
@@ -234,3 +235,55 @@ class UnknownDatabaseConnectionException(
 
     def __str__(self):
         return self.msg
+
+
+class InvalidConfigParser(DodaiException):
+    """Exception raised when an invalid parser is registered in the
+    dodai.config.ConfigFiles object.
+
+    """
+    MESSAGE = "The parser object '{name}' that you were trying to register "\
+              "is not a valid parser object.  Please make sure that this "\
+              "object contains all of the following methods: {methods}"
+
+    def __init__(self, required_methods, name):
+        self.msg = self._build_message(required_methods, name)
+
+    def _build_message(self, required_methods, name):
+        methods = quote_list(required_methods)
+        return self.MESSAGE.format(methods=methods, name=name)
+
+    def __str__(self):
+        return self.msg
+
+
+class FileDoesNotExist(DodaiException):
+    """Exception raised when a file does not exist.
+
+    """
+    MESSAGE = "The file: '{file_}' does not exist."
+
+    def __init__(self, filepath):
+        self.msg = self._build_message(filepath)
+
+    def _build_message(self, filepath):
+        return self.MESSAGE.format(file_=filepath)
+
+    def __str__(self):
+        return self.msg
+
+
+class FileIsDirectory(DodaiException):
+    """Exception raised when a file is a directory.
+
+    """
+    MESSAGE = "The file: '{file_}' is a directory."
+
+    def __init__(self, filepath):
+        self.msg = self._build_message(filepath)
+
+    def _build_message(self, filepath):
+        return self.MESSAGE.format(file_=filepath)
+
+    def __str__(self):
+        return self.msg