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__doc__="""Object Manager """


from BTree import BTree
import ts_regex, Globals
from OFS.ObjectManager import ObjectManager

bad_id=ts_regex.compile('[^a-zA-Z0-9-_~\,\. ]').match #TS

_marker=[]
class BTreeObjectManager(ObjectManager):
    """BTree object manager

    This class provides core behavior for collections of heterogeneous
    objects.  It's API is identical to that of the standard Zope
    ObjectManager.  Instead of storing it's objects sequentially, the
    BTreeObjectManager stores its objects in very efficient BTree data
    structures written in C.

    """

    meta_type  ='BTree Object Manager'

    _objects = ()
    _real_objects = BTree()

    def _checkId(self, id, allow_dup=0):
        # If allow_dup is false, an error will be raised if an object
        # with the given id already exists. If allow_dup is true,
        # only check that the id string contains no illegal chars.
        if not id:
            raise 'Bad Request', 'No id was specified'
        if bad_id(id) != -1:
            raise 'Bad Request', (
            'The id %s contains characters illegal in URLs.' % id)
        if id[0]=='_': raise 'Bad Request', (
            'The id %s  is invalid - it begins with an underscore.'  % id)
        if not allow_dup:
            if hasattr(self, 'aq_base'):
                self=self.aq_base
            if self._real_objects.has_key(id):
                raise 'Bad Request', (
                    'The id %s is invalid - it is already in use.' % id)


    def _setOb(self, id, object):
        self._real_objects[id] = object
        
    def _delOb(self, id):
        del self._real_objects[id]
        
    def _getOb(self, id, default=_marker):
        if hasattr(self, 'aq_base'):
            base=self.aq_base
        else: base=self
        if not self._real_objects.has_key(id):
            if default is _marker:
                raise AttributeError, id
            return default
        return self._real_objects[id].__of__(self)


Globals.default__class_init__(BTreeObjectManager)





