public Boolean MethodExists(String ClassName, String MethodName)
{
if (!ClassExists(ClassName))
{
return(false);
}
CDClass SearchedClass = null;
foreach (CDClass Class in this.ClassPool)
{
if (Class.Name.Equals(ClassName))
{
SearchedClass = Class;
break;
}
}
if (SearchedClass == null)
{
return(false);
}
return(SearchedClass.MethodExists(MethodName));
}
public CDClass SpawnClass(String Name)
{
CDClass NewClass = null;
if (!ClassExists(Name))
{
NewClass = new CDClass(Name);
this.ClassPool.Add(NewClass);
}
return(NewClass);
}
public bool DestroyInstance(String ClassName, long InstanceId)
{
bool Result = false;
CDClass Class = this.getClassByName(ClassName);
if (Class != null)
{
Result = Class.DestroyInstance(InstanceId);
}
return(Result);
}
// SetUloh1
public CDClassInstance RetrieveReferencedClassInstance(CDClassPool ExecutionSpace)
{
CDClass Class = ExecutionSpace.getClassByName(this.ClassName);
if (Class == null)
{
return(null);
}
CDClassInstance Instance = Class.GetInstanceByID(this.ReferencedInstanceId);
return(Instance);
}
public CDClass getClassByName(String ClassName)
{
CDClass Result = null;
foreach (CDClass Class in this.ClassPool)
{
if (Class.Name.Equals(ClassName))
{
Result = Class;
break;
}
}
return(Result);
}
// SetUloh2
public override bool Execute(OALProgram OALProgram, EXEScope Scope)
{
//Create an instance of given class -> will affect ExecutionSpace.
//If ReferencingVariableName is provided (is not ""), create a referencing variable pointing to this instance -> will affect scope
CDClass Class = OALProgram.ExecutionSpace.getClassByName(this.ClassName);
if (Class == null)
{
return(false);
}
EXEReferencingVariable Variable = Scope.FindReferencingVariableByName(this.ReferencingVariableName);
if (Variable != null)
{
if (!String.Equals(this.ClassName, Variable.ClassName))
{
return(false);
}
}
CDClassInstance Instance = Class.CreateClassInstance();
if (Instance == null)
{
return(false);
}
if (!"".Equals(this.ReferencingVariableName))
{
if (Variable != null)
{
Variable.ReferencedInstanceId = Instance.UniqueID;
}
else
{
Variable = new EXEReferencingVariable(this.ReferencingVariableName, Class.Name, Instance.UniqueID);
return(Scope.AddVariable(Variable));
}
}
return(true);
}
//SetUloh1
// Similar as task above, but this time we set the attribute value to "NewValue" parameter
// But it's not that easy, you need to check if attribute type and NewValue type are the same (e.g. both are integer)
// To do that, you need to find the referencing variable's class (via Scope) and then the attribute's type (vie ExecutionSpace)
// When you know the type of attribute, use EXETypes.IsValidValue to see if you can or cannot assign that value to that attribute
// You assign it in Scope
// Return if you could assign it or not
// EXETypes.determineVariableType()
public Boolean SetAttributeValue(String ReferencingVariableName, String AttributeName, EXEScope Scope, CDClassPool ExecutionSpace, String NewValue)
{
EXEReferencingVariable ReferencingVariable = Scope.FindReferencingVariableByName(ReferencingVariableName);
if (ReferencingVariable == null)
{
return(false);
}
CDClassInstance ClassInstance = ExecutionSpace.GetClassInstanceById(ReferencingVariable.ClassName, ReferencingVariable.ReferencedInstanceId);
if (ClassInstance == null)
{
return(false);
}
CDClass Class = ExecutionSpace.getClassByName(ReferencingVariable.ClassName);
if (Class == null)
{
return(false);
}
CDAttribute Attribute = Class.GetAttributeByName(AttributeName);
if (Attribute == null)
{
return(false);
}
String NewValueType = EXETypes.DetermineVariableType(null, NewValue);
if (!EXETypes.CanBeAssignedToAttribute(AttributeName, Attribute.Type, NewValueType))
{
return(false);
}
ClassInstance.SetAttribute(AttributeName, EXETypes.AdjustAssignedValue(Attribute.Type, NewValue));
return(true);
}
// 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);
}
public bool VerifyReferences(EXEScope Scope, CDClassPool ExecutionSpace)
{
bool Result = false;
EXEExpressionEvaluator Evaluator = new EXEExpressionEvaluator();
EXEEvaluatorHandleOperators HandleEvaluator = new EXEEvaluatorHandleOperators();
EXEReferenceEvaluator AccessEvaluator = new EXEReferenceEvaluator();
// If we just calculate with ints, reals, bools, strings
if (Evaluator.IsSimpleOperator(this.Operation))
{
foreach (EXEASTNode Operand in this.Operands)
{
if (!Operand.VerifyReferences(Scope, ExecutionSpace))
{
return(false);
}
}
Result = true;
}
// If we have handle operators
else if (HandleEvaluator.IsHandleOperator(this.Operation))
{
if (this.Operands.Count() == 1 && Scope.FindReferenceHandleByName(((EXEASTNodeLeaf)this.Operands[0]).GetNodeValue()) != null)
{
Result = true;
}
}
// If we have access operator - we either access attribute or have decimal number. There are always 2 operands
else if (".".Equals(this.Operation) && this.Operands.Count == 2)
{
if (EXETypes.IntegerTypeName.Equals(EXETypes.DetermineVariableType("", this.Operands[0].GetNodeValue())) &&
EXETypes.IntegerTypeName.Equals(EXETypes.DetermineVariableType("", this.Operands[1].GetNodeValue()))
)
{
Result = true;
}
else if (EXETypes.ReferenceTypeName.Equals(EXETypes.DetermineVariableType("", this.Operands[0].GetNodeValue())) &&
EXETypes.ReferenceTypeName.Equals(EXETypes.DetermineVariableType("", this.Operands[1].GetNodeValue()))
)
{
EXEReferencingVariable Variable = Scope.FindReferencingVariableByName(this.Operands[0].GetNodeValue());
if (Variable == null)
{
return(false);
}
CDClass Class = ExecutionSpace.getClassByName(Variable.ClassName);
if (Class == null)
{
return(false);
}
CDAttribute Attribute = Class.GetAttributeByName(this.Operands[1].GetNodeValue());
if (Attribute == null)
{
return(false);
}
CDClassInstance Instance = Variable.RetrieveReferencedClassInstance(ExecutionSpace);
if (Instance == null)
{
return(false);
}
Result = true;
}
}
return(Result);
}