[CalendarServer-changes] [8773] CalendarServer/branches/users/glyph/case-insensitive-uid

[source_changes at macosforge.org]

Revision: 8773
          http://trac.macosforge.org/projects/calendarserver/changeset/8773
Author:   glyph at apple.com
Date:     2012-02-29 10:14:50 -0800 (Wed, 29 Feb 2012)
Log Message:
-----------
Model data and method for 'check' constraint.

Modified Paths:
--------------
    CalendarServer/branches/users/glyph/case-insensitive-uid/twext/enterprise/dal/model.py

Property Changed:
----------------
    CalendarServer/branches/users/glyph/case-insensitive-uid/

Modified: CalendarServer/branches/users/glyph/case-insensitive-uid/twext/enterprise/dal/model.py
===================================================================
--- CalendarServer/branches/users/glyph/case-insensitive-uid/twext/enterprise/dal/model.py	2012-02-29 18:10:44 UTC (rev 8772)
+++ CalendarServer/branches/users/glyph/case-insensitive-uid/twext/enterprise/dal/model.py	2012-02-29 18:14:50 UTC (rev 8773)
@@ -94,6 +94,21 @@
 
 
 
+class Check(Constraint):
+    """
+    A 'check' constraint, which evaluates an SQL expression.
+
+    @ivar expression: the expression that should evaluate to True.
+    @type expression: L{twext.enterprise.dal.syntax.ExpressionSyntax}
+    """
+    # XXX TODO: model for expression, rather than 
+
+    def __init__(self, syntaxExpression):
+        self.expression = syntaxExpression
+        self.type = 'CHECK'
+
+
+
 class ProcedureCall(object):
     """
     An invocation of a stored procedure or built-in function.
@@ -290,6 +305,16 @@
         self.constraints.append(Constraint(constraintType, affectsColumns))
 
 
+    def checkConstraint(self, protoExpression):
+        """
+        This table is affected by a 'check' constraint.  (Should only be called
+        during schema parsing.)
+
+        @param protoExpression: proto expression.
+        """
+        self.constraints.append(Check(protoExpression))
+
+
     def insertSchemaRow(self, values):
         """
         A statically-defined row was inserted as part of the schema itself.
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