Item.py 4.08 KB
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##############################################################################
#
# Copyright (c) 2002 Nexedi SARL and Contributors. All Rights Reserved.
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#                    Jean-Paul Smets-Solanes <jp@nexedi.com>
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#                    Guillaume Michon        <guillaume@nexedi.com>
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#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# 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; either version 2
# of the License, or (at your option) any later version.
#
# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##############################################################################

from AccessControl import ClassSecurityInfo

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from Products.ERP5Type import Permissions, PropertySheet
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from Products.ERP5Type.XMLObject import XMLObject
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from Products.ERP5.Document.Amount import Amount
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from Products.ERP5.Document.ImmobilisableItem import ImmobilisableItem
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NEGLIGEABLE_PRICE = 10e-8


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class Item(XMLObject, Amount, ImmobilisableItem):
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    """
      Items in ERP5 are intended to provide a way to track objects
    """

    meta_type = 'ERP5 Item'
    portal_type = 'Item'
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    add_permission = Permissions.AddPortalContent
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    # Declarative security
    security = ClassSecurityInfo()
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    security.declareObjectProtected(Permissions.AccessContentsInformation)
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    # Declarative properties
    property_sheets = ( PropertySheet.Base
                      , PropertySheet.XMLObject
                      , PropertySheet.CategoryCore
                      , PropertySheet.DublinCore
                      , PropertySheet.Price
                      , PropertySheet.Item
                      , PropertySheet.Amount
                      , PropertySheet.Reference
                      )

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    if 0:
      # The following code is disabled. The original intention was to generate
      # an unique reference for each item. We now use reference instead of id,
      # so this is not applicable any longer. We need something different for
      # reference.
      security.declareProtected(Permissions.ModifyPortalContent,'generateNewId')
      def generateNewId(self, id_group='item_id_group', default=None, method=None):
        """
        We want a different id for all Item
        """
        return XMLObject.generateNewId(self, id_group=id_group, default=default, method=method)
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    def getPrice(self,context=None,**kw):
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      """
        Get the Price in the context.

        If price is not stored locally, lookup a price
      """
      local_price = self._baseGetPrice()
      if local_price is None:
        # We must find a price for this movement
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        # XXX we should not set a resource on item
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        resource = self.getResourceValue()
        if resource is not None:
          local_price = resource.getPrice(self.asContext( context=context, **kw))
      return local_price
  
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    security.declareProtected(Permissions.ModifyPortalContent, 'getRemainingQuantity')
    def getRemainingQuantity(self):
        """
        Computes the quantity of an item minus quantity of all sub_items
        """
        sub_quantity = 0
        sub_item_list = [document
                         for document in self.objectValues()
                         if document.isItem()]
        for sub_item in sub_item_list :
            sub_quantity += sub_item.getQuantity()
        return self.getQuantity() - sub_quantity