From 21b6af48b9f931d8f6133cb6adb1bee19ed72982 Mon Sep 17 00:00:00 2001
From: helmutm <helmutm@fd906abe-77d9-0310-91a1-e0d9ade77398>
Date: Sat, 28 Jan 2006 13:09:39 +0000
Subject: [PATCH] Media assets and documents as target objects for nodes:
 basically OK

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1043 fd906abe-77d9-0310-91a1-e0d9ade77398
---
 README.txt             | 32 ++++++++++++++-------
 browser/configure.zcml | 33 ++++++++++++---------
 browser/node.py        |  5 ++--
 concept.py             |  2 ++
 interfaces.py          | 65 ++++++++++++++++++++++++++++++------------
 resource.py            |  8 +++++-
 target.py              | 10 +++++--
 view.py                | 14 +++++++--
 8 files changed, 117 insertions(+), 52 deletions(-)

diff --git a/README.txt b/README.txt
index 6ec4233..7323476 100755
--- a/README.txt
+++ b/README.txt
@@ -286,11 +286,6 @@ target may be moved or renamed without any problems.)
   >>> m111.title
   u'New title for m111'
   >>> nodeConfig.targetUri = '.loops/resources/doc1'
-
-We have to get a new adapter to avoid problems with lazy variables:
-
-  >>> nodeConfig = INodeConfigSchema(m111)
-  >>> nodeConfig.title = 'New title for m111'
   >>> m111.target is doc1
   True
   >>> nodeConfig.targetType
@@ -327,16 +322,33 @@ application uses a subclass that does all the other stuff for form handling.)
   >>> isinstance(resources['m1.m11.m111'], Document)
   True
         
-It is also possible to edit a target's attributes directly in an
+A node object provides the targetSchema of its target:
+
+  >>> from loops.interfaces import IDocumentView
+  >>> from loops.interfaces import IMediaAssetView
+  >>> IDocumentView.providedBy(m111)
+  True
+  >>> IMediaAssetView.providedBy(m111)
+  False
+  >>> m111.target = None
+  >>> IDocumentView.providedBy(m111)
+  False
+  >>> m111.target = resources['ma07']
+  >>> IDocumentView.providedBy(m111)
+  False
+  >>> IMediaAssetView.providedBy(m111)
+  True
+
+It is possible to edit a target's attributes directly in an
 edit form provided by the node:
 
   >>> from loops.target import DocumentProxy, MediaAssetProxy
-  >>> ztapi.provideAdapter(INode, IDocument, DocumentProxy)
-  >>> ztapi.provideAdapter(INode, IMediaAsset, MediaAssetProxy)
+  >>> ztapi.provideAdapter(INode, IDocumentView, DocumentProxy)
+  >>> ztapi.provideAdapter(INode, IMediaAssetView, MediaAssetProxy)
 
-  >>> proxy = zapi.getAdapter(m111, IDocument)
+  >>> proxy = zapi.getAdapter(m111, IDocumentView)
   >>> proxy.title = u'Set via proxy'
-  >>> resources['m1.m11.m111'].title
+  >>> resources['ma07'].title
   u'Set via proxy'
 
 Ordering Nodes
diff --git a/browser/configure.zcml b/browser/configure.zcml
index 5db0a57..6a0047f 100644
--- a/browser/configure.zcml
+++ b/browser/configure.zcml
@@ -167,7 +167,7 @@
   <addform
       label="Add Document"
       name="AddLoopsDocument.html"
-      schema="loops.interfaces.IDocument"
+      schema="loops.interfaces.IDocumentSchema"
       fields="title data contentType"
       content_factory="loops.resource.Document"
       permission="zope.ManageContent" />
@@ -184,7 +184,7 @@
   <editform
       label="Edit Document"
       name="edit.html"
-      schema="loops.interfaces.IDocument"
+      schema="loops.interfaces.IDocumentSchema"
       fields="title data contentType"
       for="loops.interfaces.IDocument"
       permission="zope.ManageContent"
@@ -195,7 +195,7 @@
   <addform
       label="Add Media Asset"
       name="AddLoopsMediaAsset.html"
-      schema="loops.interfaces.IMediaAsset"
+      schema="loops.interfaces.IMediaAssetSchema"
       fields="title data contentType"
       content_factory="loops.resource.MediaAsset"
       permission="zope.ManageContent"
@@ -212,11 +212,11 @@
   <editform
       label="Edit Media Asset"
       name="edit.html"
-      schema="loops.interfaces.IMediaAsset"
+      schema="loops.interfaces.IMediaAssetSchema"
       fields="title data contentType"
       for="loops.interfaces.IMediaAsset"
       permission="zope.ManageContent"
-      menu="zmi_views" title="Edit"
+      menu="zmi_views" title="Edit Media Asset"
       />
 
   <!-- suppress the upload menu item: -->
@@ -271,8 +271,8 @@
       label="Add Node"
       name="AddLoopsNode.html"
       content_factory="loops.view.Node"
-      schema="loops.interfaces.INodeConfigSchema"
-      fields="title description nodeType targetType targetUri createTarget"
+      schema="loops.interfaces.INode"
+      fields="title description nodeType body"
       class="loops.browser.node.ConfigureView"
       permission="zope.ManageContent">
       
@@ -327,20 +327,25 @@
   </editform>
 
   <editform
-      label="Edit Target"
+      label="Edit Media Asset"
       name="edit_target.html"
       schema="loops.interfaces.IMediaAsset"
       fields="title data contentType"
-      for="loops.interfaces.INode"
+      for="loops.interfaces.IMediaAssetView"
       permission="zope.ManageContent"
+      menu="zmi_views" title="Edit Media Asset"
       />
 
-  <menuItem
-      for="loops.interfaces.INode"
-      menu="zmi_views" action="edit_target.html" title="Edit Target"
-      filter="context/target"
+  <editform
+      label="Edit Document"
+      name="edit_target.html"
+      schema="loops.interfaces.IDocument"
+      fields="title data contentType"
+      for="loops.interfaces.IDocumentView"
+      permission="zope.ManageContent"
+      menu="zmi_views" title="Edit Document"
       />
-  
+
   <page
       name="node.html"
       for="loops.interfaces.INode"
diff --git a/browser/node.py b/browser/node.py
index 0988888..7fa397a 100644
--- a/browser/node.py
+++ b/browser/node.py
@@ -26,7 +26,8 @@ from zope.cachedescriptors.property import Lazy
 from zope.app import zapi
 from zope.app.container.browser.contents import JustContents
 from zope.app.dublincore.interfaces import ICMFDublinCore
-from zope.configuration.config import ConfigurationContext
+#import zope.configuration.name
+from zope.dottedname.resolve import resolve
 from zope.proxy import removeAllProxies
 from zope.security import canAccess, canWrite
 from zope.security.proxy import removeSecurityProxy
@@ -114,7 +115,7 @@ class ConfigureBaseView(object):
         if form.get('field.createTarget', False):
             type = self.request.form.get('field.targetType',
                                          'loops.resource.MediaAsset')
-            factory = ConfigurationContext().resolve(type)
+            factory = resolve(type)
             uri = self.request.form.get('field.targetUri', None)
             if uri:
                 path = uri.split('/')
diff --git a/concept.py b/concept.py
index 1bbd42d..11c0b0b 100644
--- a/concept.py
+++ b/concept.py
@@ -54,6 +54,8 @@ class Concept(Contained, Persistent):
 
     implements(IConcept, IConceptManagerContained)
 
+    proxyInterface = IConcept
+    
     _title = u''
     def getTitle(self): return self._title
     def setTitle(self, title): self._title = title
diff --git a/interfaces.py b/interfaces.py
index 170091e..fcc585d 100644
--- a/interfaces.py
+++ b/interfaces.py
@@ -47,9 +47,18 @@ class ILoopsObject(Interface):
         """ Return the (default) view manager.
         """
 
+
+class IPotentialTarget(Interface):
+    """ For objects that may be used as target objects for view objects.
+    """
+
+    proxyInterface = Attribute('An interface allowing an object to be '
+                               'used as a target for a view/node (and '
+                               'typically specifying the corresponding schema')
+
 # concept interfaces
 
-class IConcept(ILoopsObject):
+class IConcept(ILoopsObject, IPotentialTarget):
     """ The concept is the central element of the loops framework.
     
         A concept is related to other concepts, may have resources
@@ -115,10 +124,7 @@ class IConceptManagerContained(Interface):
 
 # resource interfaces
 
-class IResource(ILoopsObject):
-    """ A resource is an atomic information element that is made
-        available via a view or a concept.
-    """
+class IResourceSchema(Interface):
 
     title = schema.TextLine(
                 title=_(u'Title'),
@@ -127,13 +133,6 @@ class IResource(ILoopsObject):
                 missing_value=u'',
                 required=False)
 
-    contentType = schema.BytesLine(
-                title=_(u'Content Type'),
-                description=_(u'Content type (format) of the data field'),
-                default='',
-                missing_value='',
-                required=False)
-
     data = schema.Bytes(
                 title=_(u'Data'),
                 description=_(u'Resource raw data'),
@@ -141,15 +140,26 @@ class IResource(ILoopsObject):
                 missing_value='',
                 required=False)
 
+    contentType = schema.BytesLine(
+                title=_(u'Content Type'),
+                description=_(u'Content type (format) of the data field'),
+                default='',
+                missing_value='',
+                required=False)
+
+
+class IResource(ILoopsObject, IPotentialTarget):
+    """ A resource is an atomic information element that is made
+        available via a view or a concept.
+    """
+
     def getClients(relationships=None):
         """ Return a sequence of objects that are clients of the resource,
             i.e. that have some relation with it.
         """
 
 
-class IDocument(IResource):
-    """ A resource containing an editable body.
-    """
+class IDocumentSchema(IResourceSchema):
 
     data = schema.Text(
                 title=_(u'Data'),
@@ -159,11 +169,17 @@ class IDocument(IResource):
                 required=False)
 
 
-class IMediaAsset(IResource, IBaseAsset):
-    """ A resource containing a (typically binary) file-like content
-        or an image. 
+class IDocumentView(IDocumentSchema):
+    """ Used for accessing a document via a node's target attribute"""
+
+
+class IDocument(IDocumentSchema, IResource):
+    """ A resource containing an editable body.
     """
 
+
+class IMediaAssetSchema(IResourceSchema):
+
     data = schema.Bytes(
                 title=_(u'Data'),
                 description=_(u'Media asset file'),
@@ -172,6 +188,16 @@ class IMediaAsset(IResource, IBaseAsset):
                 required=False)
 
 
+class IMediaAssetView(IMediaAssetSchema):
+    """ Used for accessing a media asset via a node's target attribute"""
+
+
+class IMediaAsset(IMediaAssetSchema, IResource, IBaseAsset):
+    """ A resource containing a (typically binary) file-like content
+        or an image. 
+    """
+
+
 class IResourceManager(ILoopsObject, IContainer):
     """ A manager/container for resources.
     """
@@ -203,6 +229,7 @@ class IView(ILoopsObject):
 
     target = Attribute('Target object that is referenced by this view')
 
+
 class IBaseNode(IOrderedContainer):
     """ Common abstract base class for different types of nodes
     """
@@ -323,4 +350,4 @@ class ILoops(ILoopsObject, IFolder):
 class ILoopsContained(Interface):
     containers(ILoops)
 
-
+    
\ No newline at end of file
diff --git a/resource.py b/resource.py
index 1a35e1a..246504b 100644
--- a/resource.py
+++ b/resource.py
@@ -31,7 +31,9 @@ from persistent import Persistent
 from cStringIO import StringIO
 from cybertools.relation.registry import getRelations
 
-from interfaces import IResource, IDocument, IMediaAsset
+from interfaces import IResource
+from interfaces import IDocument, IDocumentSchema, IDocumentView
+from interfaces import IMediaAsset, IMediaAssetSchema, IMediaAssetView
 from interfaces import IResourceManager, IResourceManagerContained
 from interfaces import ILoopsContained
 
@@ -72,6 +74,8 @@ class Document(Resource):
 
     implements(IDocument)
 
+    proxyInterface = IDocumentView
+
     _data = u''
     def setData(self, data): self._data = data
     def getData(self): return self._data
@@ -82,6 +86,8 @@ class MediaAsset(Resource, BaseMediaAsset):
 
     implements(IMediaAsset)
 
+    proxyInterface = IMediaAssetView
+
     def __init__(self, title=u''):
         super(MediaAsset, self).__init__()
         self.title = title
diff --git a/target.py b/target.py
index 1462d7e..cfe929b 100644
--- a/target.py
+++ b/target.py
@@ -29,7 +29,9 @@ from zope.component import adapts
 from zope.interface import implements
 from zope.security.proxy import removeSecurityProxy
 
-from loops.interfaces import IResource, IDocument, IMediaAsset
+from loops.interfaces import IResource
+from loops.interfaces import IDocument, IMediaAsset
+from loops.interfaces import IDocumentView, IMediaAssetView
 from loops.interfaces import IView
 
 
@@ -47,8 +49,8 @@ class ResourceProxy(object):
     contentType = property(getContentType, setContentType)
 
     def __init__(self, context):
-        self.context = context
-        #self.context = removeSecurityProxy(context)
+        #self.context = context
+        self.context = removeSecurityProxy(context)
 
     @Lazy
     def target(self):
@@ -58,6 +60,7 @@ class ResourceProxy(object):
 class DocumentProxy(ResourceProxy):
 
     implements(IDocument)
+    adapts(IDocumentView)
 
     def setData(self, data): self.target.data = data
     def getData(self): return self.target.data
@@ -67,6 +70,7 @@ class DocumentProxy(ResourceProxy):
 class MediaAssetProxy(ResourceProxy):
 
     implements(IMediaAsset)
+    adapts(IMediaAssetView)
 
     def setData(self, data): self.target.data = data
     def getData(self): return self.target.data
diff --git a/view.py b/view.py
index 437def4..d6b23bc 100644
--- a/view.py
+++ b/view.py
@@ -28,9 +28,10 @@ from zope.app.container.contained import Contained
 from zope.app.container.ordered import OrderedContainer
 from zope.app.container.traversal import ContainerTraverser, ItemTraverser
 from zope.app.container.traversal import ContainerTraversable
-from zope.cachedescriptors.property import Lazy
+from zope.cachedescriptors.property import Lazy, readproperty
 from zope.component import adapts
 from zope.interface import implements
+from zope.interface import alsoProvides, directlyProvides, directlyProvidedBy
 from zope.security.proxy import removeSecurityProxy
 from persistent import Persistent
 from cybertools.relation import DyadicRelation
@@ -73,9 +74,14 @@ class View(object):
                 return
             else:
                 registry.unregister(oldRel)
+                oldTargetSchema = oldRel.second.proxyInterface
+                directlyProvides(self, directlyProvidedBy(self) - oldTargetSchema)
+                
         if target:
+            targetSchema = target.proxyInterface
             rel = TargetRelation(self, target)
             registry.register(rel)
+            alsoProvides(self, targetSchema)
 
     target = property(getTarget, setTarget)
 
@@ -194,7 +200,7 @@ class NodeConfigAdapter(object):
     @Lazy
     def loopsRoot(self): return self.context.getLoopsRoot()
 
-    @Lazy
+    @readproperty
     def target(self):
         return self.context.target
 
@@ -225,5 +231,7 @@ class NodeConfigAdapter(object):
         pass  # only used whe a new target object is created
     targetType = property(getTargetType, setTargetType)
 
-    createTarget = False  # not used
+    def getCreateTarget(self): return False
+    def setCreateTarget(self, value): pass
+    createTarget = property(getCreateTarget, setCreateTarget)