##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################
"""Property management"""
__version__='$Revision: 1.46.6.3 $'[11:-2]
import ExtensionClass, Globals
import ZDOM
from PropertySheets import DefaultPropertySheets,vps
from ZPublisher.Converters import type_converters
from Globals import DTMLFile,MessageDialog
from Acquisition import Implicit,aq_base
from Globals import Persistent
from cgi import escape
class PropertyManager(ExtensionClass.Base, ZDOM.ElementWithAttributes):
"""
The PropertyManager mixin class provides an object with
transparent property management. An object which wants to
have properties should inherit from PropertyManager.
An object may specify that it has one or more predefined
properties, by specifying an _properties structure in its
class::
_properties=({'id':'title', 'type': 'string', 'mode': 'w'},
{'id':'color', 'type': 'string', 'mode': 'w'},
)
The _properties structure is a sequence of dictionaries, where
each dictionary represents a predefined property. Note that if a
predefined property is defined in the _properties structure, you
must provide an attribute with that name in your class or instance
that contains the default value of the predefined property.
Each entry in the _properties structure must have at least an 'id'
and a 'type' key. The 'id' key contains the name of the property,
and the 'type' key contains a string representing the object's type.
The 'type' string must be one of the values: 'float', 'int', 'long',
'string', 'lines', 'text', 'date', 'tokens', 'selection', or
'multiple section'.
For 'selection' and 'multiple selection' properties, there is an
addition item in the property dictionay, 'select_variable' which
provides the name of a property or method which returns a list of
strings from which the selection(s) can be chosen.
Each entry in the _properties structure may *optionally* provide a
'mode' key, which specifies the mutability of the property. The 'mode'
string, if present, must contain 0 or more characters from the set
'w','d'.
A 'w' present in the mode string indicates that the value of the
property may be changed by the user. A 'd' indicates that the user
can delete the property. An empty mode string indicates that the
property and its value may be shown in property listings, but that
it is read-only and may not be deleted.
Entries in the _properties structure which do not have a 'mode' key
are assumed to have the mode 'wd' (writeable and deleteable).
To fully support property management, including the system-provided
tabs and user interfaces for working with properties, an object which
inherits from PropertyManager should include the following entry in
its manage_options structure::
{'label':'Properties', 'action':'manage_propertiesForm',}
to ensure that a 'Properties' tab is displayed in its management
interface. Objects that inherit from PropertyManager should also
include the following entry in its __ac_permissions__ structure::
('Manage properties', ('manage_addProperty',
'manage_editProperties',
'manage_delProperties',
'manage_changeProperties',)),
"""
manage_options=(
{'label':'Properties', 'action':'manage_propertiesForm',
'help':('OFSP','Properties.stx')},
)
manage_propertiesForm=DTMLFile('dtml/properties', globals(),
property_extensible_schema__=1)
manage_propertyTypeForm=DTMLFile('dtml/propertyType', globals())
title=''
_properties=({'id':'title', 'type': 'string', 'mode':'w'},)
_reserved_names=()
__ac_permissions__=(
('Manage properties', ('manage_addProperty',
'manage_editProperties',
'manage_delProperties',
'manage_changeProperties',
'manage_propertiesForm',
'manage_propertyTypeForm',
'manage_changePropertyTypes',
)),
('Access contents information',
('hasProperty', 'propertyIds', 'propertyValues','propertyItems',
'getProperty', 'getPropertyType', 'propertyMap', ''),
('Anonymous', 'Manager'),
),
)
__propsets__=()
propertysheets=vps(DefaultPropertySheets)
def valid_property_id(self, id):
if not id or id[:1]=='_' or (id[:3]=='aq_') \
or (' ' in id) or hasattr(aq_base(self), id) or escape(id) != id:
return 0
return 1
def hasProperty(self, id):
"""Return true if object has a property 'id'"""
for p in self._properties:
if id==p['id']:
return 1
return 0
def getProperty(self, id, d=None):
"""Get the property 'id', returning the optional second
argument or None if no such property is found."""
if self.hasProperty(id):
return getattr(self, id)
return d
def getPropertyType(self, id):
"""Get the type of property 'id', returning None if no
such property exists"""
for md in self._properties:
if md['id']==id:
return md.get('type', 'string')
return None
def _wrapperCheck(self, object):
# Raise an error if an object is wrapped.
if hasattr(object, 'aq_base'):
raise ValueError, 'Invalid property value: wrapped object'
return
def _setPropValue(self, id, value):
self._wrapperCheck(value)
setattr(self,id,value)
def _delPropValue(self, id):
delattr(self,id)
def _setProperty(self, id, value, type='string'):
# for selection and multiple selection properties
# the value argument indicates the select variable
# of the property
self._wrapperCheck(value)
if not self.valid_property_id(id):
raise 'Bad Request', 'Invalid or duplicate property id'
if type in ('selection', 'multiple selection'):
if not hasattr(self, value):
raise 'Bad Request', 'No select variable %s' % value
self._properties=self._properties + (
{'id':id, 'type':type, 'select_variable':value},)
if type=='selection':
self._setPropValue(id, '')
else:
self._setPropValue(id, [])
else:
self._properties=self._properties+({'id':id,'type':type},)
self._setPropValue(id, value)
def _updateProperty(self, id, value):
# Update the value of an existing property. If value
# is a string, an attempt will be made to convert
# the value to the type of the existing property.
self._wrapperCheck(value)
if not self.hasProperty(id):
raise 'Bad Request', 'The property %s does not exist' % escape(id)
if type(value)==type(''):
proptype=self.getPropertyType(id) or 'string'
if type_converters.has_key(proptype):
value=type_converters[proptype](value)
self._setPropValue(id, value)
def _delProperty(self, id):
if not self.hasProperty(id):
raise ValueError, 'The property %s does not exist' % escape(id)
delattr(self,id)
self._properties=tuple(filter(lambda i, n=id: i['id'] != n,
self._properties))
def propertyIds(self):
"""Return a list of property ids """
return map(lambda i: i['id'], self._properties)
def propertyValues(self):
"""Return a list of actual property objects """
return map(lambda i,s=self: getattr(s,i['id']), self._properties)
def propertyItems(self):
"""Return a list of (id,property) tuples """
return map(lambda i,s=self: (i['id'],getattr(s,i['id'])),
self._properties)
def _propertyMap(self):
"""Return a tuple of mappings, giving meta-data for properties """
return self._properties
def propertyMap(self):
"""
Return a tuple of mappings, giving meta-data for properties.
Return copies of the real definitions for security.
"""
return tuple(map(lambda dict: dict.copy(), self._propertyMap()))
def propertyLabel(self, id):
"""Return a label for the given property id
"""
return id
def propdict(self):
dict={}
for p in self._properties:
dict[p['id']]=p
return dict
# Web interface
def manage_addProperty(self, id, value, type, REQUEST=None):
"""Add a new property via the web. Sets a new property with
the given id, type, and value."""
if type_converters.has_key(type):
value=type_converters[type](value)
self._setProperty(id.strip(), value, type)
if REQUEST is not None:
return self.manage_propertiesForm(self, REQUEST)
def manage_editProperties(self, REQUEST):
"""Edit object properties via the web.
The purpose of this method is to change all property values,
even those not listed in REQUEST; otherwise checkboxes that
get turned off will be ignored. Use manage_changeProperties()
instead for most situations.
"""
for prop in self._propertyMap():
name=prop['id']
if 'w' in prop.get('mode', 'wd'):
value=REQUEST.get(name, '')
self._updateProperty(name, value)
if REQUEST:
message="Saved changes."
return self.manage_propertiesForm(self,REQUEST,
manage_tabs_message=message)
def manage_changeProperties(self, REQUEST=None, **kw):
"""Change existing object properties.
Change object properties by passing either a mapping object
of name:value pairs {'foo':6} or passing name=value parameters
"""
if REQUEST is None:
props={}
else: props=REQUEST
if kw:
for name, value in kw.items():
props[name]=value
propdict=self.propdict()
for name, value in props.items():
if self.hasProperty(name):
if not 'w' in propdict[name].get('mode', 'wd'):
raise 'BadRequest', '%s cannot be changed' % escape(name)
self._updateProperty(name, value)
if REQUEST:
message="Saved changes."
return self.manage_propertiesForm(self,REQUEST,
manage_tabs_message=message)
# Note - this is experimental, pending some community input.
def manage_changePropertyTypes(self, old_ids, props, REQUEST=None):
"""Replace one set of properties with another
Delete all properties that have ids in old_ids, then add a
property for each item in props. Each item has a new_id,
new_value, and new_type. The type of new_value should match
new_type.
"""
err = self.manage_delProperties(old_ids)
if err:
if REQUEST is not None:
return err
return
for prop in props:
self._setProperty(prop.new_id, prop.new_value, prop.new_type)
if REQUEST is not None:
return self.manage_propertiesForm(self, REQUEST)
def manage_delProperties(self, ids=None, REQUEST=None):
"""Delete one or more properties specified by 'ids'."""
if REQUEST:
# Bugfix for property named "ids" (Casey)
if ids == self.getProperty('ids', None): ids = None
ids = REQUEST.get('_ids', ids)
if ids is None:
return MessageDialog(
title='No property specified',
message='No properties were specified!',
action ='./manage_propertiesForm',)
propdict=self.propdict()
nd=self._reserved_names
for id in ids:
if not hasattr(aq_base(self), id):
raise 'BadRequest', (
'The property <em>%s</em> does not exist' % escape(id))
if (not 'd' in propdict[id].get('mode', 'wd')) or (id in nd):
return MessageDialog(
title ='Cannot delete %s' % id,
message='The property <em>%s</em> cannot be deleted.' % id,
action ='manage_propertiesForm')
self._delProperty(id)
if REQUEST is not None:
return self.manage_propertiesForm(self, REQUEST)
Globals.default__class_init__(PropertyManager)
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