private void AddExpression(HermesModel expression)
{
if (this.QueryExpressions == null)
{
this.QueryExpressions = new ObservableCollection <SelectStatementViewModel>();
}
if (expression is SelectStatement)
{
SelectStatement statement = (SelectStatement)expression;
SelectStatementViewModel select = new SelectStatementViewModel(this, statement);
this.QueryExpressions.Add(select);
}
}
private void VisitExpression(HermesModel expression)
{
if (expression is SelectStatement)
{
VisitSelectStatement((SelectStatement)expression);
}
else if (expression is PropertyReference)
{
VisitPropertyReference((PropertyReference)expression);
}
else if (expression is ParameterExpression)
{
VisitParameterExpression((ParameterExpression)expression);
}
}
public HermesViewModel(HermesViewModel parent, HermesModel model) : this(parent)
{
this.Model = model;
}
private void AddOuterBooleanOperator()
{
BooleanOperator model = this.Model as BooleanOperator;
if (model == null)
{
return;
}
// 0. Remember the parent of this node
HermesModel consumer = model.Consumer;
HermesViewModel parentVM = this.Parent;
int index_to_replace = -1;
if (consumer is BooleanOperator)
{
index_to_replace = ((BooleanOperator)consumer).Operands.IndexOf(model);
if (index_to_replace == -1)
{
throw new ArgumentOutOfRangeException("Model is broken!");
}
}
// 1. Create new node and it's VM which will substitute this current node
BooleanOperator substitute = new BooleanOperator(consumer)
{
Name = BooleanFunction.OR
};
substitute.AddChild(model);
BooleanOperatorViewModel substituteVM = new BooleanOperatorViewModel(parentVM, substitute);
this.Parent = substituteVM;
// 2. Create new child and it's VM consumed by substitute
BooleanOperator child = new BooleanOperator(substitute);
substitute.AddChild(child);
BooleanOperatorViewModel childVM = new BooleanOperatorViewModel(substituteVM, child);
// 3. Add new comparison operator and it's VM to new born child
ComparisonOperator gift = new ComparisonOperator(child);
child.AddChild(gift);
ComparisonOperatorViewModel giftVM = new ComparisonOperatorViewModel(childVM, gift);
childVM.Operands = new ObservableCollection <BooleanFunctionViewModel>()
{
giftVM
};
// 4. Fill substitute VM with operands
substituteVM.Operands = new ObservableCollection <BooleanFunctionViewModel>()
{
this,
childVM
};
// 5. Substitute this current node at parent VM and it's model
if (consumer is BooleanOperator)
{
((BooleanOperator)consumer).Operands.RemoveAt(index_to_replace);
((BooleanOperator)consumer).Operands.Insert(index_to_replace, substitute);
index_to_replace = ((BooleanOperatorViewModel)parentVM).Operands.IndexOf(this);
if (index_to_replace > -1)
{
((BooleanOperatorViewModel)parentVM).Operands.RemoveAt(index_to_replace);
((BooleanOperatorViewModel)parentVM).Operands.Insert(index_to_replace, substituteVM);
}
}
else if (parentVM is BooleanExpressionViewModel)
{
((BooleanExpressionViewModel)parentVM).SetBooleanExpression(substituteVM);
}
}