Module constraint added

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@111 fd906abe-77d9-0310-91a1-e0d9ade77398

constraint.py

@@ -0,0 +1,69 @@
+#
+#  Copyright (c) 2004 Helmut Merz helmutm@cy55.de
+#
+#  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
+#
+
+"""
+Definition of the ResourceConstraint class.
+
+$Id$
+"""
+
+from zope.interface import implements
+
+from interfaces import IResourceConstraint
+
+
+class ResourceConstraint(object):
+
+    implements(IResourceConstraint)
+
+    explanation = u''
+    constraintType = 'select'
+    referenceType = 'explicit'
+    referenceKey = None
+
+
+    def __init__(self, task):
+        self.referenceValues = []
+        self._task = task
+
+
+    def isResourceAllowed(self, resource):
+        if self.referenceType == 'parent':
+            for r in self.referenceValues:
+                m = getattr(r, self.referenceKey)
+                if resource in m():
+                    return True
+            return False
+        elif self.referenceType == 'explicit':
+            return resource in self.referenceValues
+        else:
+            return False
+
+
+    def getAllowedResources(self, candidates=None):
+        if self.referenceType == 'parent':
+            result = []
+            for r in self.referenceValues:
+                m = getattr(r, self.referenceKey)
+                result.extend(m())
+            return tuple(result)
+        elif self.referenceType == 'explicit':
+            return tuple(self.referenceValues)
+        else:
+            return ()
+

interfaces.py

@@ -25,7 +25,7 @@ $Id$
 from zope.interface import Interface
 from zope.app.container.interfaces import IOrderedContainer
 
-from zope.schema import TextLine, List, Object
+from zope.schema import Text, TextLine, List, Object
 
 
 class ITask(IOrderedContainer):
@@ -127,21 +127,22 @@ class IResourceConstraint(Interface):
         allocated to a Task object.
     """
 
-    task = Object(ITask,
+    explanation = Text(
-        title=u'Task',
+        title=u'Explanation',
-        description=u'Task object this ResourceConstraint belongs to',
+        description=u'Explanation of this constraint - '
+                     'why or why not certain resources may be allowed',
         required=True)
 
     constraintType = TextLine(
         title=u'Constraint Type',
-        description=u'Type of the constraint: select, require, or disallow',
+        description=u'Type of the constraint: select, require, disallow',
         default=u'select',
         required=True)
 
     referenceType = TextLine(
         title=u'Reference Type',
         description=u'Type of reference to the resource attribute to check: '
-                     'explicit, type, container, attribute, property, or parent',
+                     'explicit, parent, type, attribute, property, method'
         default=u'explicit',
         required=True)
 
@@ -149,7 +150,7 @@ class IResourceConstraint(Interface):
         title=u'Reference Key',
         description=u'Key for referencing the resource attribute')
 
-    referenceValue = List(
+    referenceValues = List(
         title=u'Reference Values',
         description=u'Attribute values to check for; may be any kind of object',
         value_type=Object(Interface, title=u'Value'))
@@ -164,6 +165,5 @@ class IResourceConstraint(Interface):
 
             If given, use candidates as a list of possible resources
             (candidates must implement the IResource interface).
-
         """
 

tests/test_constraint.py

@@ -0,0 +1,65 @@
+# $Id$
+
+import unittest
+#from zope.testing.doctestunit import DocTestSuite
+from zope.interface.verify import verifyClass
+from zope.app.container.interfaces import IContained
+from zope.app.folder import Folder
+
+from loops.task import Task
+from loops.resource import Resource
+from loops.constraint import ResourceConstraint
+from loops.interfaces import IResourceConstraint
+
+class Test(unittest.TestCase):
+    "Test methods of the ResourceConstraint class."
+
+    def setUp(self):
+        #placelessSetUp()
+        self.f1 = Folder()
+        self.f1.__name__ = u'f1'
+        self.r1 = Resource()
+        self.f1['rsc1'] = self.r1
+        self.t1 = Task()
+        self.f1['tsk1'] = self.t1
+        self.rc1 = ResourceConstraint(self.t1)
+
+    def tearDown(self):
+        pass
+
+    # the tests...
+
+    def testInterface(self):
+        self.failUnless(IResourceConstraint.providedBy(self.rc1),
+            'Interface IResourceConstraint is not implemented by class ResourceConstraint.')
+        verifyClass(IResourceConstraint, ResourceConstraint)
+
+    def testSelectExplicit(self):
+        rc1 = self.rc1
+        r1 = self.r1
+        self.assertEqual(False, rc1.isResourceAllowed(r1))
+        self.assertEqual((), rc1.getAllowedResources())
+        rc1.referenceValues = ([r1])
+        self.assertEqual(True, rc1.isResourceAllowed(r1))
+        self.assertEqual((r1,), rc1.getAllowedResources())
+
+    def testSelectParent(self):
+        rc1 = self.rc1
+        r1 = self.r1
+        t2 = Task()
+        t2.allocateResource(r1)
+        rc1.referenceType = 'parent'
+        rc1.referenceKey = 'getAllocatedResources'
+        rc1.referenceValues = ([t2])
+        self.assertEqual(True, rc1.isResourceAllowed(r1))
+        self.assertEqual((r1,), rc1.getAllowedResources())
+
+
+def test_suite():
+    return unittest.TestSuite((
+#            DocTestSuite('loops.tests.doctests'),
+            unittest.makeSuite(Test),
+            ))
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='test_suite')