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# Copyright (C) 2003 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <jan@intevation.de>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.
"""
Classes for generic ArcView ODB Objects
as in '.apr', '.avl' and other files.
"""
__version__ = "$Revision: 1882 $"
from types import StringType
from Thuban import _
class ODBBaseObject:
"""Base class for ODB objects."""
_obj_refs = [] # override this list with the object names
# as strings that are referenced.
_values = [] # override this list with the keywords
# for known values of the class.
def __init__(self, parent_odb, type, number):
self._parent_odb = parent_odb
self.type = type
self.number = number
def __setattr__(self, attr, value):
"""If an attribute is set that already exists,
a list is created to contain both. Any further
attribute with the same name is appended to the list.
"""
if hasattr(self, attr):
v = getattr(self, attr)
if isinstance(v, list):
v.append(value)
else:
self.__dict__[attr] = [v, value]
else:
self.__dict__[attr] = value
def __repr__(self):
"""The string represenation of an object is the syntax
as used in the ODB file.
"""
s = '(' + self.type + '.' + str(self.number) + '\n'
for k in self.__dict__.keys():
if k in [ '_parent_odb', 'type', 'number']: continue
v = self.__dict__[k]
if isinstance(v, list):
for val in v:
s += "\t%s:\t%s\n" % (k, val)
else:
s += "\t%s:\t%s\n" % (k, v)
s += ')\n'
return s
def Get(self, attr):
"""If an attribute is a pointer (or a list of pointers)
to another object (other objects), references are resolved
to point to the corresponding objects.
attr -- string with the name of the attribute
"""
if not hasattr(self, attr):
print "Object %s.%s has no attribute %s!" % ( self.type,
self.number, attr)
return None
if attr in self._obj_refs:
if isinstance(self.__dict__[attr], list):
lst = []
for obj_id in self.__dict__[attr]:
obj_id = int(obj_id)
if not self._parent_odb.GetObjects().has_key(obj_id):
print "Object #%d missing!" % obj_id
else:
lst.append(self._parent_odb.GetObjects()[obj_id])
return lst
else:
obj_id = int(self.__dict__[attr])
if not self._parent_odb.GetObjects().has_key(obj_id):
print "Object #%d missing!" % s
return None
return self._parent_odb.GetObjects()[obj_id]
return self.__dict__[attr]
def TreeInfo(self):
"""Return the information in a tree-like structure."""
items = []
# known values
for o in self._values:
if hasattr(self, o):
items.append('%s: %s' % (o, self.Get(o)))
# the objects
for o in self._obj_refs:
if not hasattr(self, o): continue
if not isinstance(self.Get(o), list):
items.append(self.Get(o).TreeInfo())
# add the variable name of the object:
items[-1][0] = '%s: %s' % (o, items[-1][0])
continue
for obj in self.Get(o):
items.append(obj.TreeInfo())
# add the variable name of the object:
items[-1][0] = '%s: %s' % (o, items[-1][0])
# unknown values
for k in self.__dict__.keys():
if k in [ '_parent_odb', 'type', 'number']: continue
if k in self._obj_refs: continue
if k in self._values: continue
v = self.__dict__[k]
if isinstance(v, list):
items.append(_("Unknown Object list named: '%s'") % k)
else:
if isinstance(v, StringType):
items.append(_("Unknown Value named: '%s' with value '%s'")\
% ( k, v ))
else:
items.append(_('Unknown Object named: %s') % k)
return [self.type, items]
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