public OrPredicate Read_OrPredicate(XmlNode nodeRepresentation)
{
OrPredicate predicate = new OrPredicate();
foreach (XmlNode childNode in nodeRepresentation.ChildNodes)
{
TextPredicate child = this.ReadTextPredicate(childNode);
predicate.AddChild(child);
}
return(predicate);
}
private void OrButton_Clicked(object sender, EventArgs e)
{
OrPredicate or = new OrPredicate();
TextPredicate child = this.getPendingChildPredicate();
if (child != null)
{
or.AddChild(child);
this.openPredicates.Add(or);
}
else
{
this.addChild(or);
}
this.updateLayout();
}
// add the given predicate as a child of the leafmost existing predicate
private void addChild(TextPredicate predicate)
{
if (this.openPredicates.Count < 1)
{
// no predicates already exist, this one becomes the primary one
this.openPredicates.Add(predicate);
return;
}
TextPredicate last = this.openPredicates.Last();
OrPredicate or = last as OrPredicate;
if (or != null)
{
// we have a pending 'or'; add it here
or.AddChild(predicate);
return;
}
AndPredicate and = last as AndPredicate;
if (and != null)
{
// we have a pending 'and'; add it here
and.AddChild(predicate);
return;
}
NotPredicate not = last as NotPredicate;
if (not != null)
{
// we have a pending 'not'; add it here
not.Child = predicate;
return;
}
if (last == null)
{
// We have an empty spot to add this predicate to
// This user is expected to attach this to a parent later
// If the user doesn't attach this to a parent later, we will for them
this.openPredicates.RemoveAt(this.openPredicates.Count - 1);
this.openPredicates.Add(predicate);
return;
}
// error; do nothing
}
