/// <summary>
/// Gets the names of the top-level nodes in the projection state tree (for non-polymorphic scenarios) that match a set of attribute names
/// </summary>
/// <param name="projCtx">The projection context.</param>
/// <param name="attrNames">The list of attribute names to match from.</param>
internal static Dictionary <string, string> GetTopList(ProjectionContext projCtx, List <string> attrNames)
{
// This dictionary contains a mapping from the top-level (most recent) name of an attribute
// to the attribute name the top-level name was derived from (the name contained in the given list)
Dictionary <string, string> topLevelAttributeNames = new Dictionary <string, string>();
// Iterate through each attribute name in the list and search for their top-level names
foreach (string attrName in attrNames)
{
// Iterate through each projection attribute state in the current set and check if its
// current resolved attribute's name is the top-level name of the current attrName
foreach (ProjectionAttributeState top in projCtx.CurrentAttributeStateSet.States)
{
SearchStructure st = new SearchStructure();
st = SearchStructure.BuildStructure(top, top, attrName, st, false, 0);
// Found the top-level name
if (st?.Result.FoundFlag == true)
{
// Create a mapping from the top-level name of the attribute to the name it has in the given list
topLevelAttributeNames[top.CurrentResolvedAttribute.ResolvedName] = attrName;
}
}
}
return(topLevelAttributeNames);
}
/// <summary>
/// Build a structure using a stack
/// </summary>
/// <param name="curr"></param>
/// <param name="top"></param>
/// <param name="attrName"></param>
/// <param name="st"></param>
/// <param name="foundFlag"></param>
/// <returns></returns>
internal static SearchStructure BuildStructure(
ProjectionAttributeState curr,
ProjectionAttributeState top,
string attrName,
SearchStructure st,
bool foundFlag,
int foundDepth)
{
if (curr != null)
{
st.Add(curr);
if (StringUtils.EqualsWithCase(curr.CurrentResolvedAttribute.ResolvedName, attrName))
{
foundFlag = true;
st.Result.FoundFlag = true;
st.Result.FoundDepth = foundDepth;
st.Result.Found = curr;
}
if (foundFlag && (curr?.PreviousStateList == null || curr?.PreviousStateList?.Count == 0))
{
st.Result.Leaf.Add(curr);
}
if (curr.PreviousStateList?.Count > 0)
{
foreach (var prev in curr.PreviousStateList)
{
BuildStructure(prev, top, attrName, st, foundFlag, foundDepth + 1);
}
}
}
return(st);
}
/// <summary>
/// Get top node of the projection state tree for non-polymorphic scenarios
/// </summary>
/// <param name="projCtx"></param>
/// <param name="attrName"></param>
/// <returns></returns>
internal static List <ProjectionAttributeState> GetTop(ProjectionContext projCtx, string attrName)
{
SearchResult result = new SearchResult();
foreach (ProjectionAttributeState top in projCtx.CurrentAttributeStateSet.Values)
{
SearchStructure st = new SearchStructure();
st = SearchStructure.BuildStructure(top, top, attrName, st, false, 0);
if (st?.Result.FoundFlag == true)
{
result = st.Result;
}
}
return(result?.Top);
}
/// <summary>
/// Get leaf nodes of the projection state tree for polymorphic scenarios
/// </summary>
/// <param name="projCtx"></param>
/// <param name="attrName"></param>
/// <returns></returns>
internal static List <ProjectionAttributeState> GetLeafList(ProjectionContext projCtx, string attrName)
{
SearchResult result = null;
foreach (ProjectionAttributeState top in projCtx.CurrentAttributeStateSet.States)
{
SearchStructure st = new SearchStructure();
st = SearchStructure.BuildStructure(top, top, attrName, st, false, 0);
if (st?.Result.FoundFlag == true && st.Result.Leaf.Count > 0)
{
result = st.Result;
}
}
return(result?.Leaf);
}
