protected virtual AmbethIFilterDescriptor ComposeTwoComposite(AmbethCompositeFilterDescriptor filter1, AmbethCompositeFilterDescriptor filter2, AmbethLogicalOperator logicalOperator)
{
if (filter1.LogicalOperator == logicalOperator)
{
// If the logical operators of both composites are equal to the logical operator that relates them, they can be combined into a single composite:
if (filter2.LogicalOperator == logicalOperator)
{
foreach (AmbethIFilterDescriptor filter in filter2.ChildFilterDescriptors)
{
filter1.ChildFilterDescriptors.Add(filter);
}
return(filter1);
}
// If only one of the composites has the same logical operator that relates them, the other can be added to its childs:
filter1.ChildFilterDescriptors.Add(filter2);
return(filter1);
}
if (filter2.LogicalOperator == logicalOperator)
{
filter2.ChildFilterDescriptors.Add(filter1);
return(filter2);
}
// The logical operators do not match, hence a new composite must be created:
AmbethCompositeFilterDescriptor newComposite = new AmbethCompositeFilterDescriptor();
newComposite.LogicalOperator = logicalOperator;
newComposite.ChildFilterDescriptors = new List <AmbethIFilterDescriptor>();
newComposite.ChildFilterDescriptors.Add(filter1);
newComposite.ChildFilterDescriptors.Add(filter2);
return(newComposite);
}
protected virtual AmbethIFilterDescriptor ComposeSimpleAndComposite(AmbethFilterDescriptor filter1, AmbethCompositeFilterDescriptor filter2, AmbethLogicalOperator logicalOperator)
{
if (filter2.LogicalOperator == logicalOperator)
{
filter2.ChildFilterDescriptors.Add(filter1);
return(filter2);
}
AmbethCompositeFilterDescriptor newComposite = new AmbethCompositeFilterDescriptor();
newComposite.LogicalOperator = logicalOperator;
newComposite.ChildFilterDescriptors = new List <AmbethIFilterDescriptor>();
newComposite.ChildFilterDescriptors.Add(filter1);
newComposite.ChildFilterDescriptors.Add(filter2);
return(newComposite);
}
public virtual AmbethIFilterDescriptor Compose(AmbethIFilterDescriptor filter1, AmbethIFilterDescriptor filter2, AmbethLogicalOperator logicalOperator = AmbethLogicalOperator.AND)
{
// Try to simplify both filters before combining them:
filter1 = TryReduce(filter1);
if (filter1 == null)
{
return(TryReduce(filter2));
}
filter2 = TryReduce(filter2);
if (filter2 == null)
{
return(filter1);
}
if (filter1 is AmbethCompositeFilterDescriptor)
{
if (filter2 is AmbethCompositeFilterDescriptor)
{
return(ComposeTwoComposite(filter1 as AmbethCompositeFilterDescriptor, filter2 as AmbethCompositeFilterDescriptor, logicalOperator));
}
return(ComposeSimpleAndComposite(filter2 as AmbethFilterDescriptor, filter1 as AmbethCompositeFilterDescriptor, logicalOperator));
}
if (filter2 is AmbethCompositeFilterDescriptor)
{
return(ComposeSimpleAndComposite(filter1 as AmbethFilterDescriptor, filter2 as AmbethCompositeFilterDescriptor, logicalOperator));
}
AmbethCompositeFilterDescriptor newComposite = new AmbethCompositeFilterDescriptor();
newComposite.LogicalOperator = logicalOperator;
newComposite.ChildFilterDescriptors = new List <AmbethIFilterDescriptor>();
newComposite.ChildFilterDescriptors.Add(filter1);
newComposite.ChildFilterDescriptors.Add(filter2);
return(newComposite);
}
