public bool VerifyReferences(EXEScope Scope, CDClassPool ExecutionSpace)
{
bool Result = false;
if (!EXETypes.ReferenceTypeName.Equals(EXETypes.DetermineVariableType("", this.Value)))
{
Result = true;
}
else
{
Result = Scope.VariableNameExists(this.Value);
}
return(Result);
}
// SetUloh2
public override bool Execute(OALProgram OALProgram, EXEScope Scope)
{
//Select instances of given class that match the criteria and assign them to variable with given name
// ClassName tells us which class we are interested in
// Cardinality tells us whether we want one random instance (matching the criteria) or all of them
// "Many" - we create variable EXEReferencingSetVariable, "Any" - we create variable EXEReferencingVariable
// Variable name tells us how to name the newly created referencing variable
// Where condition tells us which instances to select from all instances of the class (just do EXEASTNode.Evaluate and return true if the result "true" and false for "false")
// When making unit tests, do not use the "where" causule yet, because its evaluation is not yet implemented
// If relationship selection does not exists, this is problem
if (this.RelationshipSelection == null)
{
return(false);
}
CDClass Class = OALProgram.ExecutionSpace.getClassByName(this.RelationshipSelection.GetLastClassName());
if (Class == null)
{
return(false);
}
// We need to check, if the variable already exists, it must be of corresponding type
if (Scope.VariableNameExists(this.VariableName))
{
if
(
!(
(EXECommandQuerySelect.CardinalityAny.Equals(this.Cardinality)
&&
this.RelationshipSelection.GetLastClassName() == Scope.FindReferencingVariableByName(this.VariableName).ClassName)
||
(EXECommandQuerySelect.CardinalityMany.Equals(this.Cardinality)
&&
this.RelationshipSelection.GetLastClassName() == Scope.FindSetReferencingVariableByName(this.VariableName).ClassName)
)
)
{
return(false);
}
}
// Evaluate relationship selection. If it fails, execution fails too
List <long> SelectedIds = this.RelationshipSelection.Evaluate(OALProgram.RelationshipSpace, Scope);
if (SelectedIds == null)
{
return(false);
}
// If class has no instances, command may execute successfully, but we better verify references in the WHERE condition
if (SelectedIds.Count() == 0 && this.WhereCondition != null)
{
return(this.WhereCondition.VerifyReferences(Scope, OALProgram.ExecutionSpace));
}
// Now let's evaluate the condition
if (this.WhereCondition != null && SelectedIds.Any())
{
String TempSelectedVarName = "selected";
EXEReferencingVariable SelectedVar = new EXEReferencingVariable(TempSelectedVarName, this.RelationshipSelection.GetLastClassName(), -1);
if (!Scope.AddVariable(SelectedVar))
{
return(false);
}
List <long> ResultIds = new List <long>();
foreach (long Id in SelectedIds)
{
SelectedVar.ReferencedInstanceId = Id;
String ConditionResult = this.WhereCondition.Evaluate(Scope, OALProgram.ExecutionSpace);
//Console.Write(Id + " : " + ConditionResult);
if (!EXETypes.IsValidValue(ConditionResult, EXETypes.BooleanTypeName))
{
Scope.DestroyReferencingVariable(TempSelectedVarName);
return(false);
}
if (EXETypes.BooleanTrue.Equals(ConditionResult))
{
ResultIds.Add(Id);
}
}
SelectedIds = ResultIds;
Scope.DestroyReferencingVariable(TempSelectedVarName);
}
// Now we have ids of selected instances. Let's assign them to a variable
if (EXECommandQuerySelect.CardinalityMany.Equals(this.Cardinality))
{
EXEReferencingSetVariable Variable = Scope.FindSetReferencingVariableByName(this.VariableName);
if (Variable == null)
{
Variable = new EXEReferencingSetVariable(this.VariableName, this.RelationshipSelection.GetLastClassName());
if (!Scope.AddVariable(Variable))
{
return(false);
}
}
foreach (long Id in SelectedIds)
{
Variable.AddReferencingVariable(new EXEReferencingVariable("", Variable.ClassName, Id));
}
}
else if (EXECommandQuerySelect.CardinalityAny.Equals(this.Cardinality))
{
EXEReferencingVariable Variable = Scope.FindReferencingVariableByName(this.VariableName);
if (Variable == null)
{
long ResultId = SelectedIds.Any() ? SelectedIds[new Random().Next(SelectedIds.Count)] : -1;
Variable = new EXEReferencingVariable(this.VariableName, this.RelationshipSelection.GetLastClassName(), ResultId);
if (!Scope.AddVariable(Variable))
{
return(false);
}
}
}
else
{
return(false);
}
return(true);
}
