Package Products :: Package ZenRelations :: Module RelationshipBase |
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# Source Code for Module Products.ZenRelations.RelationshipBase

      1  ###########################################################################
      2  #
      3  # This program is part of Zenoss Core, an open source monitoring platform.
      4  # Copyright (C) 2007, Zenoss Inc.
      5  #
      6  # This program is free software; you can redistribute it and/or modify it
      7  # under the terms of the GNU General Public License version 2 as published by
      8  # the Free Software Foundation.
      9  #
     10  # For complete information please visit: http://www.zenoss.com/oss/
     11  #
     12  ###########################################################################
     13
     14  __doc__="""RelationshipBase
     15
     16  RelationshipBase is the base class for RelationshipManager
     17  and ToManyRelationship.
     18
     19  $Id: RelationshipBase.py,v 1.26 2003/10/03 16:16:01 edahl Exp $"""
     20
     21  __version__ = "$Revision: 1.26 $"[11:-2]
     22
     23  import logging
     24  log = logging.getLogger("zen.Relations")
     25
     26  from Globals import InitializeClass
     27  from Acquisition import aq_base
     28  from zope import interface
     29
     30  from Products.ZenRelations.Exceptions import *
     31  from Products.ZenRelations.utils import importClass
     32
     33  from PrimaryPathObjectManager import PrimaryPathManager
     34
     35  from zope.event import notify
     36  from OFS.event import ObjectWillBeAddedEvent
     37  from OFS.event import ObjectWillBeRemovedEvent
     38  from zope.app.container.contained import dispatchToSublocations
     39  from zope.app.container.contained import ObjectAddedEvent
     40  from zope.app.container.contained import ObjectRemovedEvent
     41  from zope.app.container.contained import ContainerModifiedEvent
     42
     43 -class IRelationship(interface.Interface):
     44      """
     45      Marker interface.
     46      """
     47
     48 -class RelationshipBase(PrimaryPathManager):
     49      """
     50      Abstract base class for all relationship classes.
     51      """
     52      interface.implements(IRelationship)
     53
     54      _operation = -1 # if a Relationship's are only deleted
     55
     56 -    def __call__(self):
     57          """Return the contents of this relation."""
     58          raise NotImplementedError
     59
     60
     61 -    def getId(self):
     62          return self.id
     63
     64
     65 -    def hasobject(self, obj):
     66          """Does this relationship relate to obj."""
     67          raise NotImplementedError
     68
     69
     70 -    def _add(self, obj):
     71          """Add object to local side of relationship."""
     72          raise NotImplementedError
     73
     74
     75 -    def _remove(self,obj=None):
     76          """
     77          Remove object from local side of relationship.
     78          If obj=None remove all object in the relationship
     79          """
     80          raise NotImplementedError
     81
     82
     83 -    def _remoteRemove(self, obj=None):
     84          """Remove obj form the remote side of this relationship."""
     85          raise NotImplementedError
     86
     87
     88 -    def addRelation(self, obj):
     89          """Form a bi-directional relation between self and obj."""
     90          if obj is None: raise ZenRelationsError("Can not add None to relation")
     91          if not isinstance(obj, self.remoteClass()):
     92              raise ZenSchemaError("%s restricted to class %s. %s is class %s" %
     93                  (self.id, self.remoteClass().__name__,
     94                   obj.id, obj.__class__.__name__))
     95          try:
     96              self._add(obj)
     97              rname = self.remoteName()
     98              # make sure remote rel is on this obj
     99              getattr(aq_base(obj), rname)
    100              remoteRel = getattr(obj, self.remoteName())
    101              remoteRel._add(self.__primary_parent__)
    102          except RelationshipExistsError:
    103              log.debug("obj %s already exists on %s", obj.getPrimaryId(),
    104                          self.getPrimaryId())
    105
    106
    107 -    def removeRelation(self, obj=None):
    108          """remove an object from a relationship"""
    109          self._remoteRemove(obj)
    110          self._remove(obj)
    111
    112
    113 -    def remoteType(self):
    114          """Return the type of the remote end of our relationship."""
    115          schema = self.__primary_parent__.lookupSchema(self.id)
    116          return schema.remoteType
    117
    118
    119 -    def remoteTypeName(self):
    120          """Return the type of the remote end of our relationship."""
    121          schema = self.__primary_parent__.lookupSchema(self.id)
    122          return schema.remoteType.__name__
    123
    124
    125 -    def remoteClass(self):
    126          """Return the class at the remote end of our relationship."""
    127          classdef = getattr(aq_base(self), "_v_remoteClass", None)
    128          if not classdef:
    129              schema = self.__primary_parent__.lookupSchema(self.id)
    130              classdef = importClass(schema.remoteClass)
    131              self._v_remoteClass = classdef
    132          return classdef
    133
    134
    135 -    def remoteName(self):
    136          """Return the name at the remote end of our relationship."""
    137          schema = self.__primary_parent__.lookupSchema(self.id)
    138          return schema.remoteName
    139
    140
    141 -    def getPrimaryParent(self):
    142          """Return our parent object by our primary path"""
    143          return self.__primary_parent__.primaryAq()
    144
    145
    146 -    def getRelationshipManagerClass(self):
    147          """
    148          Return the local class of this relationship. For all relationshps
    149          this is the class of our __primary_parent___.
    150          """
    151          return self.__primary_parent__.__class__
    152
    153
    154 -    def cb_isCopyable(self):
    155          """Don't let relationships move off their managers"""
    156          return 0
    157
    158
    159 -    def cb_isMoveable(self):
    160          """Don't let relationships move off their managers"""
    161          return 0
    162
    163
    164 -    def checkRelation(self, repair=False):
    165          """Check to make sure that relationship bidirectionality is ok.
    166          """
    167          return
    168
    169
    170  InitializeClass(RelationshipBase)
    171