Make Query and ComplexQuery hashable, so that they can be used as dictionnary...

Make Query and ComplexQuery hashable, so that they can be used as dictionnary key. It is valid as long as nobody use direct access to properties - there is no setter defined - and that extra care is taken not modify variants members which are provided at construction.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15457 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ZSQLCatalog/SQLCatalog.py

@@ -258,6 +258,13 @@ class Query(QueryMixin):
   def __call__(self):
     self.asSQLExpression()
 
+  def __hash__(self):
+    value = self.value
+    if isinstance(value, list):
+      value = tuple(value)
+    return hash((self.format, self.operator, self.range, self.search_mode,
+                 self.table_alias_list, self.key, value, self.type))
+
   def getRange(self):
     return self.range
 
@@ -454,6 +461,10 @@ class ComplexQuery(QueryMixin):
   def __call__(self):
     self.asSQLExpression()
 
+  def __hash__(self):
+    subquery_hash = hash(tuple([hash(x) for x in self.getQueryList()]))
+    return hash((subquery_hash, self.operator))
+
   def getQueryList(self):
     return self.query_list