ProxyField.py 24 KB
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##############################################################################
#
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# Copyright (c) 2006 Nexedi SARL and Contributors. All Rights Reserved.
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#                    Jean-Paul Smets <jp@nexedi.com>
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#                    Romain Courteaud <romain@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 Products.Formulator import Widget, Validator
from Products.Formulator.Field import ZMIField
from Products.Formulator.DummyField import fields
from Products.Formulator.Errors import ValidationError
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from Products.Formulator import MethodField
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from Products.ERP5Type.Utils import convertToUpperCase
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from Products.ERP5Type.TransactionalVariable import getTransactionalVariable
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from Products.CMFCore.utils import getToolByName

from Products.PageTemplates.PageTemplateFile import PageTemplateFile

from Globals import get_request
from Products.PythonScripts.Utility import allow_class

from Products.PythonScripts.standard import url_quote_plus

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from AccessControl import ClassSecurityInfo
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from MethodObject import Method
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from zLOG import LOG, WARNING, DEBUG, PROBLEM
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from Acquisition import aq_base, aq_inner, aq_acquire, aq_chain
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from Globals import DTMLFile
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from Products.Formulator.TALESField import TALESMethod
from Products.ERP5Form.Form import StaticValue, TALESValue, OverrideValue, DefaultValue, EditableValue
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from Products.ERP5Form.Form import copyMethod, isCacheable
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_USE_ORIGINAL_GET_VALUE_MARKER = []

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_field_value_cache = {}
def purgeFieldValueCache():
  _field_value_cache.clear()
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class WidgetDelegatedMethod(Method):
  """Method delegated to the proxied field's widget.
  """
  def __init__(self, method_id, default=''):
    self._method_id = method_id
    self._default = default

  def __call__(self, instance, *args, **kw):
    field = instance
    proxied_field = field.getRecursiveTemplateField()
    if proxied_field:
      proxied_method = getattr(proxied_field.widget, self._method_id)
      return proxied_method(field, *args, **kw)
    return self._default


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class ProxyWidget(Widget.Widget):
  """
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  A widget that renders itself as a field from another form
  after changing its title and id. It is recommended to define
  a master form on which complex fields with a lot of TALES
  are defined in order to minimize code duplication.
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  """

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  property_names = [
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    'form_id',
    'field_id',
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    'target',
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  ]

  form_id = fields.StringField(
                                'form_id',
                                title='Form ID',
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                                description= \
                                  "ID of the master form.",
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                                default="",
                                required=1)

  field_id = fields.StringField(
                                'field_id',
                                title='Field ID',
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                                description= \
                                  "ID of the field in the master form.",
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                                default="",
                                required=1)

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  target = fields.HyperLinkField(
                                'target',
                                title='Proxy Target',
                                description="Link to the master field edit form",
                                default='Click to edit the target',
                                href='manage_edit_target',
                                required=0)

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  # Field API Methods, delegated to the template field widget
  render = WidgetDelegatedMethod('render', default='')
  render_htmlgrid = WidgetDelegatedMethod('render_htmlgrid', default='')
  render_view = WidgetDelegatedMethod('render_view', default='')
  render_pdf = WidgetDelegatedMethod('render_pdf', default='')
  render_css = WidgetDelegatedMethod('render_css', default='')
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  render_dict = WidgetDelegatedMethod('render_dict', default=None)
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  render_odf = WidgetDelegatedMethod('render_odf', default='')
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  get_javascript_list = WidgetDelegatedMethod(
                            'get_javascript_list', default=[])
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class ProxyValidator(Validator.Validator):
  """
    Validation of entered value through proxy field
  """
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  property_names = []
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  def validate(self, field, key, REQUEST):
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    proxy_field = field.getRecursiveTemplateField()
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    try:
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      result = proxy_field.validator.validate(field, key, REQUEST)
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    except ValidationError, error:
      error.field_id = field.id
      raise error
    return result

ProxyWidgetInstance = ProxyWidget()
ProxyValidatorInstance = ProxyValidator()

class ProxyField(ZMIField):
  meta_type = "ProxyField"
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  security = ClassSecurityInfo()
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  widget = ProxyWidgetInstance
  validator = ProxyValidatorInstance
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  delegated_list = tuple()
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  delegated_message_list = tuple()
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  # methods screen
  security.declareProtected('View management screens',
                            'manage_main')
  manage_main = DTMLFile('dtml/proxyFieldEdit', globals())

  # tales screen
  security.declareProtected('View management screens',
                            'manage_talesForm')
  manage_talesForm = DTMLFile('dtml/proxyFieldTales', globals())

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  # messages screen
  security.declareProtected('View management screens', 'manage_messagesForm')
  manage_messagesForm = DTMLFile('dtml/proxyFieldMessages', globals())

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  # proxy field list header
  security.declareProtected('View management screens', 'proxyFieldListHeader')
  proxyFieldListHeader = DTMLFile('dtml/proxyFieldListHeader', globals())

  security.declareProtected('Change Formulator Forms', 'manage_edit')
  def manage_edit(self, REQUEST):
    """
    Surcharged values from proxied field.
    """
    # Edit template field attributes
    template_field = self.getRecursiveTemplateField()
    if template_field is not None:

      # Check the surcharged checkboxes
      surcharge_list = []
      for group in template_field.form.get_groups():
        for field in template_field.form.get_fields_in_group(group):
          field_id = field.id
          checkbox_key = "surcharge_%s" % field_id
          if not REQUEST.has_key(checkbox_key):
            surcharge_list.append(field_id)

      try:
        # validate the form and get results
        result = template_field.form.validate(REQUEST)
      except ValidationError, err:
        if REQUEST:
          message = "Error: %s - %s" % (err.field.get_value('title'),
                                        err.error_text)
          return self.manage_main(self, REQUEST,
                                  manage_tabs_message=message)
        else:
          raise

      self._surcharged_edit(result, surcharge_list)
    
    # Edit standards attributes
    # XXX It is not possible to call ZMIField.manage_edit because
    # it returns at the end...
    # we need to had a parameter to the method
    try:
      # validate the form and get results
      result = self.form.validate(REQUEST)
    except ValidationError, err:
      if REQUEST:
        message = "Error: %s - %s" % (err.field.get_value('title'),
                                      err.error_text)
        return self.manage_main(self,REQUEST,
                                manage_tabs_message=message)
      else:
        raise

    self._edit(result)
        
    if REQUEST:
      message="Content changed."
      return self.manage_main(self, REQUEST,
                              manage_tabs_message=message)

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  def manage_edit_surcharged_xmlrpc(self, mapping):
    """Edit surcharged properties
    This method is similar to manage_edit_xmlrpc, and it marks the properties
    as not delegated.
    """
    self._surcharged_edit(mapping, mapping.keys())

  def manage_tales_surcharged_xmlrpc(self, mapping):
    """Edit surcharged TALES
    This method is similar to manage_tales_xmlrpc, and it marks the TALES
    properties as not delegated.
    """
    self._surcharged_tales(mapping, mapping.keys())


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  def _surcharged_edit(self, result, surcharge_list):
    # first check for any changes  
    values = self.values
    # if we are in unicode mode, convert result to unicode
    # acquire get_unicode_mode and get_stored_encoding from form..
    if self.get_unicode_mode():
      new_result = {}
      for key, value in result.items():
        if type(value) == type(''):
          # in unicode mode, Formulator UI always uses UTF-8
          value = unicode(value, 'UTF-8')
        new_result[key] = value
      result = new_result

    changed = []
    for key, value in result.items():
      # XXX Remove old values
      values.pop(key, None)
      # store keys for which we want to notify change
      if not values.has_key(key) or values[key] != value:
        changed.append(key)

    proxied_field = self.getTemplateField()
    for key, value in result.items():
      if key not in surcharge_list:
        result.pop(key)
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        if key in self.tales:
          self.tales.pop(key)
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    # now do actual update of values
    values.update(result)
    self.values = values
    self.delegated_list = surcharge_list

    # finally notify field of all changed values if necessary
    for key in changed:
      method_name = "on_value_%s_changed" % key
      if hasattr(self, method_name):
        getattr(self, method_name)(values[key])

  security.declareProtected('Change Formulator Forms', 'manage_tales')
  def manage_tales(self, REQUEST):
    """
    Surcharged talesfrom proxied field.
    """
    template_field = self.getRecursiveTemplateField()
    if template_field is not None:

      # Check the surcharged checkboxes
      surcharge_list = []
      for group in template_field.tales_form.get_groups():
        for field in template_field.tales_form.get_fields_in_group(group):
          field_id = field.id
          checkbox_key = "surcharge_%s" % field_id
          if not REQUEST.has_key(checkbox_key):
            surcharge_list.append(field_id)


      try:
        # validate the form and get results
        result = template_field.tales_form.validate(REQUEST)
      except ValidationError, err:
        if REQUEST:
          message = "Error: %s - %s" % (err.field.get_value('title'),
                                        err.error_text)
          return self.manage_talesForm(self, REQUEST,
                                       manage_tabs_message=message)
        else:
          raise

      self._surcharged_tales(result, surcharge_list)

    try:
      # validate the form and get results
      result = self.tales_form.validate(REQUEST)
    except ValidationError, err:
      if REQUEST:
        message = "Error: %s - %s" % (err.field.get_value('title'),
                                      err.error_text)
        return self.manage_talesForm(self,REQUEST,
                                     manage_tabs_message=message)
      else:
        raise

    self._edit_tales(result)

    
    if REQUEST:
      message="Content changed."
      return self.manage_talesForm(self, REQUEST,
                                            manage_tabs_message=message)

  def _surcharged_tales(self, result, surcharge_list):
    # first check for any changes  
    tales = self.tales

    changed = []
    for key, value in result.items():
      # XXX Remove old values
      tales.pop(key, None)

    proxied_field = self.getTemplateField()
    for key, value in result.items():
      if key not in surcharge_list:
        result.pop(key)
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        if key in self.values:
          self.values.pop(key)
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    # now do actual update of values
    tales.update(result)
    self.tales = tales
    self.delegated_list = surcharge_list
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    # Put a default value on not delegated parameter
    for key in result.keys():
      if not self.values.has_key(key):
        self.values[key] = self.get_recursive_orig_value(key, include=0)
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  security.declareProtected('Change Formulator Fields', 'manage_messages')
  def manage_messages(self, REQUEST):
    """Change message texts.
    """
    surcharge_list = []
    messages = self.message_values
    unicode_mode = self.get_unicode_mode()
    for message_key in self.get_error_names():
      checkbox_key = "surcharge_%s" % message_key
      if not REQUEST.has_key(checkbox_key):
        surcharge_list.append(message_key)
        message = REQUEST[message_key]
        if unicode_mode:
          message = unicode(message, 'UTF-8')
        messages[message_key] = message
      else:
        if message_key in messages:
          messages.pop(message_key)
    self.message_values = messages
    self.delegated_message_list = surcharge_list
    if REQUEST:
      message="Content changed."
      return self.manage_messagesForm(self,REQUEST,
                                      manage_tabs_message=message)

  security.declareProtected('View management screens', 'get_error_message') 
  def get_error_message(self, name): 
    if not self.is_message_delegated(name):
      try: 
        return self.message_values[name] 
      except KeyError: 
        if name in self.validator.message_names: 
          return getattr(self.validator, name) 
        else: 
          return "Unknown error: %s" % name 
    else:
      return self.getTemplateField().get_error_message(name)

  security.declareProtected('View management screens', 'get_error_names') 
  def get_error_names(self): 
    """Get error messages. 
    """ 
    return self.getTemplateField().get_error_names()

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  def getTemplateField(self):
    """
    Return template field of the proxy field.
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    """
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    try:
      return self._getTemplateFieldCache()
    except KeyError:
      pass

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    form = self.aq_parent
    object = form.aq_parent
    try:
      proxy_form = getattr(object, self.get_value('form_id'))
      proxy_field = aq_base(getattr(proxy_form, self.get_value('field_id')))
      proxy_field = proxy_field.__of__(form)
    except AttributeError:
      LOG('ProxyField', WARNING, 
          'Could not get a field from a proxy field %s in %s' % \
              (self.id, object.id))
      proxy_field = None
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    self._setTemplateFieldCache(proxy_field)
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    return proxy_field

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  def getRecursiveTemplateField(self):
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    """
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    Return template field of the proxy field.
    This result must not be a ProxyField.
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    """
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    field = self
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    chain = []
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    while True:
      template_field = field.getTemplateField()
      if template_field.__class__ != ProxyField:
        break
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      if aq_base(template_field) in chain:
        LOG('ProxyField', WARNING, 'Infinite loop detected in %s.' %
            '/'.join(self.getPhysicalPath()))
        return
      chain.append(aq_base(template_field))
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      field = template_field
    return template_field
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  def _aq_dynamic(self, name):
    if name == 'sub_form':
      return self.getTemplateField().sub_form
    return None

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  security.declareProtected('Access contents information', 
                            'is_delegated')
  def is_delegated(self, id):
    """
    Return true if we get the value from the proxied field.
    No, if we surcharged the value on the proxy field.
    """
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    return id not in self.delegated_list
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  security.declareProtected('Access contents information', 
                            'is_message_delegated')
  def is_message_delegated(self, id):
    """
    Return true if we get the message from the proxied field.
    No, if we surcharged the message on the proxy field.
    """
    return id not in self.delegated_message_list

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  security.declareProtected('Access contents information', 
                            'get_recursive_orig_value')
  def get_recursive_orig_value(self, id, include=1):
    """
    Get value for id recursively.
    """
    if include and \
      ((id in self.widget.property_names) or \
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       ((not self.is_delegated(id)) and \
       (self.values.has_key(id)))):
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      return self.get_orig_value(id)
    else:
      proxied_field = self.getTemplateField()
      if proxied_field.__class__ == ProxyField:
        return proxied_field.get_recursive_orig_value(id)
      else:
        return proxied_field.get_orig_value(id)

  security.declareProtected('View management screens', 'get_recursive_tales')
  def get_recursive_tales(self, id, include=1):
    """
    Get tales expression method for id.
    """
    if include and \
      ((id in self.widget.property_names) or \
       not self.is_delegated(id)):
      return self.get_tales(id)
    else:
      proxied_field = self.getTemplateField()
      if proxied_field.__class__ == ProxyField:
        return proxied_field.get_recursive_tales(id)
      else:
        return proxied_field.get_tales(id)
    
  # XXX Not implemented
  security.declareProtected('View management screens', 'get_recursive_override')
  def get_recursive_override(self, id):
    """
    Get override method for id (not wrapped).
    """
    return self.overrides.get(id, "")

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  security.declareProtected('Edit target', 'manage_edit_target')
  def manage_edit_target(self, REQUEST):
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    """ 
    Edit target field of this proxy
    """
    proxy_field = self.getTemplateField()
    if proxy_field:
      url='/'.join((self.absolute_url(),
                    self.get_value('form_id'),
                    self.get_value('field_id'),
                    'manage_main'))
      REQUEST.RESPONSE.redirect(url)
    else:
      # FIXME: should show some error message 
      # ("form_id and field_id don't define a valid template")
      pass
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  security.declareProtected('Access contents information', 'has_value')
  def has_value(self, id):
    """
    Return true if the field defines such a value.
    """
    result = None
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    if (id in self.widget.property_names) or \
       (not self.is_delegated(id)):
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      result = ZMIField.has_value(self, id)
    else:
      proxy_field = self.getTemplateField()
      if proxy_field is not None:
        result = proxy_field.has_value(id)
    return result
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  security.declareProtected('Access contents information', '_get_user_input_value')
  def _get_user_input_value(self, key, REQUEST):
    """
    Try to get a value of the field from the REQUEST
    """
    proxy_field = self.getTemplateField()
    if proxy_field is not None:
      result = proxy_field._get_user_input_value(key, REQUEST)
    else:
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      result = ZMIField._get_user_input_value(self, key, REQUEST)
    return result
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  #
  # Performance improvement
  #
  def get_tales_expression(self, id):
    field = self
    while True:
      if (id in field.widget.property_names or
          not field.is_delegated(id)):
        tales = field.get_tales(id)
        if tales:
          return TALESMethod(tales._text)
        else:
          return None
      proxied_field = field.getTemplateField()
      if proxied_field.__class__ == ProxyField:
        field = proxied_field
      elif proxied_field is None:
        raise ValueError, "Can't find the template field of %s" % self.id
      else:
        tales = proxied_field.get_tales(id)
        if tales:
          return TALESMethod(tales._text)
        else:
          return None

  def getFieldValue(self, field, id, **kw):
    """
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      Return a callable expression and cacheable boolean flag
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    """
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    try:
      tales_expr = self.get_tales_expression(id)
    except ValueError:
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      return None, False
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    if tales_expr:
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      tales_expr = copyMethod(tales_expr)
      return TALESValue(tales_expr), isCacheable(tales_expr)
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    # FIXME: backwards compat hack to make sure overrides dict exists
    if not hasattr(self, 'overrides'):
        self.overrides = {}

    override = self.overrides.get(id, "")
    if override:
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      override = copyMethod(override)
      return OverrideValue(override), isCacheable(override)
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    # Get a normal value.
    try:
      template_field = self.getRecursiveTemplateField()
      # Old ListBox instance might have default attribute. so we need to check it.
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      if checkOriginalGetValue(template_field, id):
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        return _USE_ORIGINAL_GET_VALUE_MARKER, True
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      value = self.get_recursive_orig_value(id)
    except KeyError:
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      # For ListBox and other exceptional fields.
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      return self._get_value(id, **kw), False
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    field_id = field.id

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    value = copyMethod(value)
    cacheable = isCacheable(value)

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    if id == 'default' and field_id.startswith('my_'):
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      return DefaultValue(field_id, value), cacheable
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    # For the 'editable' value, we try to get a default value
    if id == 'editable':
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      return EditableValue(value), cacheable
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    # Return default value in callable mode
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    if callable(value):
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      return StaticValue(value), cacheable
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    # Return default value in non callable mode
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    return_value = StaticValue(value)(field, id, **kw)
    return return_value, isCacheable(return_value)
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  security.declareProtected('Access contents information', 'get_value')
  def get_value(self, id, **kw):
    REQUEST = get_request()
    if ((id in self.widget.property_names) or
        (not self.is_delegated(id))):
      return ZMIField.get_value(self, id, **kw)

    field = self
    proxy_field = self.getTemplateField()
    if proxy_field is not None and REQUEST is not None:
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      field = REQUEST.get(
        'field__proxyfield_%s_%s_%s' % (self.id, self._p_oid, id),
        self)
      REQUEST.set(
        'field__proxyfield_%s_%s_%s' % (proxy_field.id, proxy_field._p_oid, id),
        field)
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    # Don't use cache if field is not stored in zodb, or if target field is
    # defined by a TALES
    if self._p_oid is None or self.tales['field_id'] or self.tales['form_id']:
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      return self._get_value(id, **kw)

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    cache_id = ('ProxyField.get_value',
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                self._p_oid,
                field._p_oid,
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                id)

    try:
      value = _field_value_cache[cache_id]
    except KeyError:
      # either returns non callable value (ex. "Title")
      # or a FieldValue instance of appropriate class
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      value, cacheable = self.getFieldValue(field, id, **kw)
      if cacheable:
        _field_value_cache[cache_id] = value
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    if value is _USE_ORIGINAL_GET_VALUE_MARKER:
      return self.getTemplateField().get_value(id, **kw)

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    if callable(value):
      return value(field, id, **kw)
    return value

  def _get_value(self, id, **kw):
    proxy_field = self.getTemplateField()
    if proxy_field is not None:
      return proxy_field.get_value(id, **kw)

  def _getCacheId(self):
    return '%s%s' % ('ProxyField', self._p_oid or repr(self))

  def _setTemplateFieldCache(self, field):
    getTransactionalVariable(self)[self._getCacheId()] = field

  def _getTemplateFieldCache(self):
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    if self.aq_parent:
      raise KeyError
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    return getTransactionalVariable(self)[self._getCacheId()].__of__(self.aq_parent)
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#
# get_value exception dict
#
_get_value_exception_dict = {}

def registerOriginalGetValueClassAndArgument(class_, argument_name_list=()):
  """
  if field class has its own get_value implementation and
  must use it rather than ProxyField's one, then register it.

  if argument_name_list is '*' , original get_value is
  applied for all arguments.
  """
  if not isinstance(argument_name_list, (list, tuple)):
    argument_name_list = (argument_name_list,)
  _get_value_exception_dict[class_] = argument_name_list

def checkOriginalGetValue(instance, argument_name):
  """
  if exception data is registered, then return True
  """
  class_ = aq_base(instance).__class__
  argument_name_list = _get_value_exception_dict.get(class_)

  if argument_name_list is None:
    return False
  
  if len(argument_name_list)==1 and argument_name_list[0]=='*':
    return True

  if argument_name in argument_name_list:
    return True
  return False