[Zope-Checkins] CVS: Zope/lib/python/ComponentArchitecture - Feature.py:1.1.2.1 Errors.py:1.1.4.2 Presentation.py:1.1.4.6 __init__.py:1.1.4.3

Shane Hathaway shane@digicool.com
Fri, 5 Oct 2001 12:03:34 -0400


Update of /cvs-repository/Zope/lib/python/ComponentArchitecture
In directory cvs.zope.org:/tmp/cvs-serv14942

Modified Files:
      Tag: ComponentArchitecture-branch
	Errors.py Presentation.py __init__.py 
Added Files:
      Tag: ComponentArchitecture-branch
	Feature.py 
Log Message:
Added "features".


=== Added File Zope/lib/python/ComponentArchitecture/Feature.py ===
##############################################################################
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##############################################################################
"""
Feature component management
"""

from types import StringType

import Interface
from Interface import objectImplements
from Acquisition import ExplicitAcquisitionWrapper, aq_base

import Errors
from Service import Service, findComponent
from IToIRegistry import IToIRegistry


_marker = []  # Create a new marker object.


FEATURE_SERVICE_NAME = 'Features'

class FeatureService (Service):
    """
    """

    def getUnboundComponent(inputs, output):
        """
        Returns a feature component.
        """


_global_reg = IToIRegistry()

def registerFeature(input, output, unbound_comp):
    # assert unbound_comp.allowsBindingTo(input)
    _global_reg.register(input, output, unbound_comp)


def getFeature(object, output, default=_marker):
    """
    Finds a feature for an object by examining what it implements.
    Searches in services then the global registry.
    """
    inputs = objectImplements(object)
    c = findComponent(FEATURE_SERVICE_NAME, object,
                      (inputs, output))
    if c is None:
        reg = _global_reg
        for input in inputs:
            c = reg.get(input, output)
            if c is not None:
                break
    if c is None:
        if default is not _marker:
            return default
        else:
            raise Errors.FeatureNotFound(object, output)
    # Bind the component.
    r = c(object)

    if type(output) is not StringType:
        assert output.isImplementedBy(r), '%s does not implement %s' % (
            `output`, `r`)

##    if not hasattr(r, 'aq_base'):
##        # XXX Add an acquisition wrapper.
##        r = ExplicitAcquisitionWrapper(r, object)
##    if aq_base(r) is not r:
##        # It's a wrapper.
##        r.aq_setData('id', '(p)%s' % name)
    return r



=== Zope/lib/python/ComponentArchitecture/Errors.py 1.1.4.1 => 1.1.4.2 ===
 
 class PresentationNotFound (ObjectAndNameException):
-    """Could not find the necessary presentation for a component"""
+    """Could not find the requested presentation for a component"""
+
+
+class FeatureNotFound (ObjectAndNameException):
+    """Could not find a feature"""
 
 
 class InterfaceNotFound (ObjectAndNameException):


=== Zope/lib/python/ComponentArchitecture/Presentation.py 1.1.4.5 => 1.1.4.6 ===
 import Interface
 from Interface import objectImplements
-from Acquisition import ExplicitAcquisitionWrapper
+from Acquisition import ExplicitAcquisitionWrapper, aq_base
 
 import Errors
 from Service import Service, findComponent
@@ -149,4 +149,7 @@
 ##    if not hasattr(r, 'aq_base'):
 ##        # XXX Add an acquisition wrapper.
 ##        r = ExplicitAcquisitionWrapper(r, object)
+    if aq_base(r) is not r:
+        # It's a wrapper.
+        r.aq_setData('id', '(p)%s' % name)
     return r


=== Zope/lib/python/ComponentArchitecture/__init__.py 1.1.4.2 => 1.1.4.3 ===
 providePresentation = Presentation.registerPresentation
 
+from Feature import getFeature, registerFeature
+provideFeature = registerFeature
+
 ##from Content import Content, ContentContainer
 
 ##import FactoryComponents