/// <summary>
/// Returns the list of Object in a IfcRelAssociatesMaterial with the specified material select.
/// </summary>
/// <param name="instanceCollection"></param>
/// <param name="matSel">The material select to search.</param>
/// <param name="deepSearch">
/// True if the function needs to execute a deeper semantical analysis of the relations (it can expand the query result).
/// False if a direct analysis of explicit associations with the specific MaterialSet.
/// </param>
public static IEnumerable <IIfcDefinitionSelect> GetInstancesOfMaterial(this IEntityCollection instanceCollection, IIfcMaterialSelect matSel, bool deepSearch)
{
// Debug.WriteLine(string.Format("GetInstance {0}, {1}", matSel.EntityLabel.ToString(), DeepSearch));
if (matSel is IIfcMaterial)
{
// straight return of objects of all associations
var assocs = instanceCollection.OfType <IIfcRelAssociatesMaterial>().Where(
x => x.RelatingMaterial.EntityLabel == matSel.EntityLabel
);
foreach (var assoc in assocs)
{
// ... and returns one object at a time in the enumerable
foreach (var item in assoc.RelatedObjects)
{
yield return(item);
}
}
}
else if (matSel is IIfcMaterialLayer)
{
if (!deepSearch)
{
// straight return of objects of all associations
var assocs = instanceCollection.OfType <IIfcRelAssociatesMaterial>().Where(
x => x.RelatingMaterial.EntityLabel == matSel.EntityLabel
);
foreach (var assoc in assocs)
{
// ... and returns one object at a time in the enumerable
foreach (var item in assoc.RelatedObjects)
{
yield return(item);
}
}
}
else // this is deep search
{
foreach (var straightMatch in GetInstancesOfMaterial(instanceCollection, ((IIfcMaterialLayer)matSel).ToMaterialLayerSet, false))
{
yield return(straightMatch);
}
}
}
else if (matSel is IIfcMaterialList)
{
if (!deepSearch)
{
// straight return of objects of all associations
var assocs = instanceCollection.OfType <IIfcRelAssociatesMaterial>().Where(
x => x.RelatingMaterial.EntityLabel == matSel.EntityLabel
);
foreach (var assoc in assocs)
{
// ... and returns one object at a time in the enumerable
foreach (var item in assoc.RelatedObjects)
{
yield return(item);
}
}
}
else // this is deep search
{
// a problem with this is that some exporters produce multiple IfcMaterialList that
// they share the same underlying set of Materials, so we are looking for a signature of the underlying materials.
//
var baseMatArray = ((IIfcMaterialList)matSel).Materials.Select(x => x.EntityLabel).ToArray(); // this is the signature.
var cmp = EqualityComparer <int> .Default;
foreach (var testingMaterialList in instanceCollection.OfType <IIfcMaterialList>())
{
bool bDoesMatch;
if (testingMaterialList.EntityLabel == matSel.EntityLabel)
{ // no need to compare
bDoesMatch = true;
}
else
{
var compMatArray = testingMaterialList.Materials.Select(x => x.EntityLabel).ToArray(); // this is the other signature.
bDoesMatch = ArraysEqual(baseMatArray, compMatArray, cmp);
}
if (bDoesMatch)
{
foreach (var straightMatch in GetInstancesOfMaterial(instanceCollection, testingMaterialList, false))
{
yield return(straightMatch);
}
}
}
}
}
else if (matSel is IIfcMaterialLayerSet)
{
// no difference in deep mode available for this type
// given a material layerset ...
// ... search for all its usages modes ...
var lsUsages = instanceCollection.OfType <IIfcMaterialLayerSetUsage>().Where(
x => x.ForLayerSet.EntityLabel == ((IIfcMaterialLayerSet)matSel).EntityLabel
);
foreach (var lsUsage in lsUsages)
{
// ... then for each usage mode, searches the relations with objects ...
foreach (var item in GetInstancesOfMaterial(instanceCollection, lsUsage, false))
{
yield return(item);
}
}
}
else if (matSel is IIfcMaterialLayerSetUsage)
{
if (deepSearch)
{
// identify the underlying material layer set and return all its usages.
foreach (var item in instanceCollection.GetInstancesOfMaterial(((IIfcMaterialLayerSetUsage)matSel).ForLayerSet, false))
{
yield return(item);
}
}
else
{
// straight return of objects of all associations
var assocs = instanceCollection.OfType <IIfcRelAssociatesMaterial>().Where(
x => x.RelatingMaterial.EntityLabel == matSel.EntityLabel
);
foreach (var assoc in assocs)
{
// ... and returns one object at a time in the enumerable
foreach (var item in assoc.RelatedObjects)
{
yield return(item);
}
}
}
}
else
{
Debugger.Break();
Debug.WriteLine("Unexpected case");
}
}