/// <summary>
/// Function to initialize the input projection attribute state Set for a projection
/// </summary>
/// <param name="projDir"></param>
/// <param name="ctx"></param>
/// <param name="orgSrcRAS"></param>
/// <param name="isSourcePolymorphic"></param>
/// <param name="polymorphicSet"></param>
/// <returns></returns>
internal static ProjectionAttributeStateSet InitializeProjectionAttributeStateSet(
ProjectionDirective projDir,
CdmCorpusContext ctx,
ResolvedAttributeSet orgSrcRAS,
bool isSourcePolymorphic = false,
Dictionary <string, List <ProjectionAttributeState> > polymorphicSet = null)
{
ProjectionAttributeStateSet set = new ProjectionAttributeStateSet(ctx);
foreach (ResolvedAttribute resAttr in orgSrcRAS.Set)
{
List <ProjectionAttributeState> prevSet = null;
if (isSourcePolymorphic && polymorphicSet != null)
{
List <ProjectionAttributeState> polyList = null;
polymorphicSet.TryGetValue(resAttr.ResolvedName, out polyList);
prevSet = polyList;
}
ProjectionAttributeState projAttrState = new ProjectionAttributeState(ctx)
{
CurrentResolvedAttribute = resAttr,
PreviousStateList = prevSet
};
set.Add(projAttrState);
}
return(set);
}
public ProjectionContext(ProjectionDirective projDirective, CdmAttributeContext attrCtx)
{
this.ProjectionDirective = projDirective;
this.CurrentAttributeContext = attrCtx;
this.CurrentAttributeStateSet = new ProjectionAttributeStateSet(projDirective?.Owner?.Ctx);
}
/// <summary>
/// If a source is tagged as polymorphic source, get the list of original source
/// </summary>
/// <param name="projDir"></param>
/// <param name="ctx"></param>
/// <param name="source"></param>
/// <param name="attrCtxParam"></param>
/// <returns></returns>
internal static Dictionary <string, List <ProjectionAttributeState> > GetPolymorphicSourceSet(
ProjectionDirective projDir,
CdmCorpusContext ctx,
CdmEntityReference source,
ResolvedAttributeSet rasSource)
{
Dictionary <string, List <ProjectionAttributeState> > polySources = new Dictionary <string, List <ProjectionAttributeState> >();
// TODO (sukanyas): when projection based polymorphic source is made available - the following line will have to be changed
// for now assuming non-projections based polymorphic source
CdmEntityDefinition sourceDef = source.FetchObjectDefinition <CdmEntityDefinition>(projDir.ResOpt);
foreach (CdmAttributeItem attr in sourceDef.Attributes)
{
if (attr.ObjectType == CdmObjectType.EntityAttributeDef)
{
// the attribute context for this entity typed attribute was already created by the `FetchResolvedAttributes` that happens before this function call.
// we are only interested in linking the attributes to the entity that they came from and the attribute context nodes should not be taken into account.
// create this dummy attribute context so the resolution code works properly and discard it after.
AttributeContextParameters attrCtxParam = new AttributeContextParameters
{
Regarding = attr,
type = CdmAttributeContextType.PassThrough,
under = new CdmAttributeContext(ctx, "discard")
};
ResolvedAttributeSet raSet = ((CdmEntityAttributeDefinition)attr).FetchResolvedAttributes(projDir.ResOpt, attrCtxParam);
foreach (ResolvedAttribute resAttr in raSet.Set)
{
// we got a null ctx because null was passed in to fetch, but the nodes are in the parent's tree
// so steal them based on name
var resAttSrc = rasSource.Get(resAttr.ResolvedName);
if (resAttSrc != null)
{
resAttr.AttCtx = resAttSrc.AttCtx;
}
ProjectionAttributeState projAttrState = new ProjectionAttributeState(ctx)
{
CurrentResolvedAttribute = resAttr,
PreviousStateList = null
};
// the key doesn't exist, initialize with an empty list first
if (!polySources.ContainsKey(resAttr.ResolvedName))
{
polySources[resAttr.ResolvedName] = new List <ProjectionAttributeState>();
}
polySources[resAttr.ResolvedName].Add(projAttrState);
}
}
}
return(polySources);
}
/// <summary>
/// If a source is tagged as polymorphic source, get the list of original source
/// </summary>
/// <param name="projDir"></param>
/// <param name="ctx"></param>
/// <param name="source"></param>
/// <param name="attrCtxParam"></param>
/// <returns></returns>
internal static Dictionary <string, List <ProjectionAttributeState> > GetPolymorphicSourceSet(
ProjectionDirective projDir,
CdmCorpusContext ctx,
CdmEntityReference source,
ResolvedAttributeSet rasSource,
AttributeContextParameters attrCtxParam)
{
Dictionary <string, List <ProjectionAttributeState> > polySources = new Dictionary <string, List <ProjectionAttributeState> >();
// TODO (sukanyas): when projection based polymorphic source is made available - the following line will have to be changed
// for now assuming non-projections based polymorphic source
CdmEntityDefinition sourceDef = source.FetchObjectDefinition <CdmEntityDefinition>(projDir.ResOpt);
foreach (CdmAttributeItem attr in sourceDef.Attributes)
{
if (attr.ObjectType == CdmObjectType.EntityAttributeDef)
{
ResolvedAttributeSet raSet = ((CdmEntityAttributeDefinition)attr).FetchResolvedAttributes(projDir.ResOpt, null);
foreach (ResolvedAttribute resAttr in raSet.Set)
{
// we got a null ctx because null was passed in to fetch, but the nodes are in the parent's tree
// so steal them based on name
var resAttSrc = rasSource.Get(resAttr.ResolvedName);
if (resAttSrc != null)
{
resAttr.AttCtx = resAttSrc.AttCtx;
}
ProjectionAttributeState projAttrState = new ProjectionAttributeState(ctx)
{
CurrentResolvedAttribute = resAttr,
PreviousStateList = null
};
// the key already exists, just add to the existing list
if (polySources.ContainsKey(resAttr.ResolvedName))
{
List <ProjectionAttributeState> exisitingSet = polySources[resAttr.ResolvedName];
exisitingSet.Add(projAttrState);
polySources[resAttr.ResolvedName] = exisitingSet;
}
else
{
List <ProjectionAttributeState> pasList = new List <ProjectionAttributeState>();
pasList.Add(projAttrState);
polySources.Add(resAttr.ResolvedName, pasList);
}
}
}
}
return(polySources);
}
/// <summary>
/// Create a constant entity that contains the source mapping to a foreign key.
/// e.g.
/// an fk created to entity "Customer" based on the "customerName", would add a parameter to the "is.linkedEntity.identifier" trait as follows:
/// [
/// "/Customer.cdm.json/Customer",
/// "customerName"
/// ]
/// In the case of polymorphic source, there will be a collection of such entries.
/// </summary>
/// <param name="corpus"></param>
/// <param name="foundResAttrList"></param>
/// <returns></returns>
internal static CdmEntityReference CreateForeignKeyLinkedEntityIdentifierTraitParameter(ProjectionDirective projDir, CdmCorpusDefinition corpus, List <ProjectionAttributeState> refFoundList)
{
CdmEntityReference traitParamEntRef = null;
List <Tuple <string, string> > entRefAndAttrNameList = new List <Tuple <string, string> >();
foreach (ProjectionAttributeState refFound in refFoundList)
{
ResolvedAttribute resAttr = refFound.CurrentResolvedAttribute;
if (resAttr?.Target?.Owner != null &&
(resAttr.Target.ObjectType == CdmObjectType.TypeAttributeDef || resAttr.Target.ObjectType == CdmObjectType.EntityAttributeDef))
{
var owner = resAttr.Target.Owner;
while (owner != null && owner.ObjectType != CdmObjectType.EntityDef)
{
owner = owner.Owner;
}
if (owner != null && owner.ObjectType == CdmObjectType.EntityDef)
{
CdmEntityDefinition entDef = owner.FetchObjectDefinition <CdmEntityDefinition>(projDir.ResOpt);
if (entDef != null)
{
// should contain relative path without the namespace
string relativeEntPath = entDef.Ctx.Corpus.Storage.CreateRelativeCorpusPath(entDef.AtCorpusPath, entDef.InDocument);
entRefAndAttrNameList.Add(new Tuple <string, string>(relativeEntPath, resAttr.ResolvedName));
}
}
}
}
if (entRefAndAttrNameList.Count > 0)
{
CdmConstantEntityDefinition constantEntity = corpus.MakeObject <CdmConstantEntityDefinition>(CdmObjectType.ConstantEntityDef);
constantEntity.EntityShape = corpus.MakeRef <CdmEntityReference>(CdmObjectType.EntityRef, "entityGroupSet", true);
string originalSourceEntityAttributeName = projDir.OriginalSourceEntityAttributeName;
if (originalSourceEntityAttributeName == null)
{
originalSourceEntityAttributeName = "";
}
constantEntity.ConstantValues = entRefAndAttrNameList.Select((entAndAttrName) => new List <string> {
entAndAttrName.Item1, entAndAttrName.Item2, $"{originalSourceEntityAttributeName}_{entAndAttrName.Item1.Substring(entAndAttrName.Item1.LastIndexOf("/") + 1)}"
}).ToList();
traitParamEntRef = corpus.MakeRef <CdmEntityReference>(CdmObjectType.EntityRef, constantEntity, false);
}
return(traitParamEntRef);
}