/// <summary>
/// Get entity type
/// </summary>
/// <param name="relation">Relation name</param>
/// <param name="end1">Entity relation END 1</param>
/// <returns>Type</returns>
public string GetEntityType(string relation, ModelEntity end1)
{
var chain = GetRelationEntityChain(
relation,
end1
);
return
((chain.RelationType == ModelRelationEntityChainType.ManyToMany ||
chain.RelationType == ModelRelationEntityChainType.OneToMany)
? "BaseEntityCollection<" + chain.End2.Name + ">"
: chain.End2.Name);
}
/// <summary>
/// Get relation entity chain
/// </summary>
/// <param name="relation">Relation name</param>
/// <param name="end1">Entity relation END 1</param>
/// <returns>Entity chain</returns>
public ModelRelationEntityChain GetRelationEntityChain(string relation, ModelEntity end1)
{
var chain = new ModelRelationEntityChain();
chain.End1 = end1;
#region Seek chain
var path = relation
.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
if (path.Length != 2)
{
throw new ModelException("Malformed relation");
}
chain.Parent = Entities.FirstOrDefault(
x => x.Name.Equals(path[0], StringComparison.InvariantCultureIgnoreCase));
if (chain.Parent == null)
{
throw new ModelException("Unknown entity \"" + path[0] + "\"");
}
chain.Relation = chain.Parent.Relations.FirstOrDefault(
x => x.Name.Equals(path[1], StringComparison.InvariantCultureIgnoreCase));
if (chain.Relation == null)
{
throw new ModelException("Relation \"" + path[1] + "\" cannot be found on \"" + path[0] + "\"");
}
chain.End2 = Entities.FirstOrDefault(
x => x.Name.Equals(chain.Relation.EntityName, StringComparison.InvariantCultureIgnoreCase));
if (chain.End2 == null)
{
throw new ModelException("Referenced entity \"" + chain.Relation.EntityName +
"\" cannot be found by \"" + chain.Relation.Name + "\"");
}
// @if END 1 is the same as END 2 then relation parent should become the new END 2;
if (chain.End1 == chain.End2)
{
chain.End2 =
chain.Parent;
}
#endregion
#region Find relation type
if (chain.End1 != chain.Parent &&
chain.End1 != chain.End2 && chain.Parent != chain.End2)
{
chain.RelationType = ModelRelationEntityChainType.ManyToMany;
if (!chain.Parent.Fields.Where(
x => string.IsNullOrEmpty(x.Relation)).All(x => x.IsKey == true))
{
chain.End2 = chain.Parent;
chain.RelationType = ModelRelationEntityChainType.ManyToOne;
}
}
else
{
var relationEnd1KeyFields = new Dictionary <string, ModelField>(StringComparer.InvariantCultureIgnoreCase);
foreach (var item in chain.Relation.Fields)
{
relationEnd1KeyFields.Add(item.ParentColumnName,
chain.End1.Fields.FirstOrDefault(x =>
x.ColumnName != null &&
x.ColumnName.Equals(item.ParentColumnName, StringComparison.InvariantCultureIgnoreCase))
);
}
var relationEnd2KeyFields = new Dictionary <string, ModelField>(StringComparer.InvariantCultureIgnoreCase);
foreach (var item in chain.Relation.Fields)
{
relationEnd2KeyFields.Add(item.ChildColumnName,
chain.End2.Fields.FirstOrDefault(x =>
x.ColumnName != null &&
x.ColumnName.Equals(item.ChildColumnName, StringComparison.InvariantCultureIgnoreCase))
);
}
var numOfKeysOnEnd1 = chain.End1.Fields.Count(x => x.IsKey == true);
var numOfKeysOnEnd2 = chain.End2.Fields.Count(x => x.IsKey == true);
if (numOfKeysOnEnd1 == numOfKeysOnEnd2 &&
relationEnd1KeyFields.Count == relationEnd2KeyFields.Count &&
numOfKeysOnEnd1 == relationEnd1KeyFields.Count)
{
chain.RelationType = ModelRelationEntityChainType.OneToOne;
}
else if (numOfKeysOnEnd1 == relationEnd1KeyFields.Count)
{
chain.RelationType = ModelRelationEntityChainType.OneToMany;
}
else if (numOfKeysOnEnd2 == relationEnd2KeyFields.Count)
{
chain.RelationType = ModelRelationEntityChainType.ManyToOne;
}
}
#endregion
return(chain);
}
/// <summary>
/// Get entity relation hierarchy
/// </summary>
/// <param name="rootEntity">Root entity</param>
/// <returns>Entity hierarchy</returns>
public List <ModelEntity> GetEntityRelationHierarchy(ModelEntity rootEntity)
{
var bag = new Dictionary <ModelEntity, HashSet <ModelEntity> >();
var res = new List <ModelEntity>();
#region Collect dependencies
Action <ModelEntity> depCollAct = null;
depCollAct =
new Action <ModelEntity>((currEntity) =>
{
if (bag.ContainsKey(currEntity))
{
return;
}
bag.Add(currEntity, new HashSet <ModelEntity>());
foreach (var field in
currEntity.Fields.Where(x => !string.IsNullOrEmpty(x.Relation)))
{
var chain = GetRelationEntityChain(
field.Relation,
currEntity
);
switch (chain.RelationType)
{
case ModelRelationEntityChainType.ManyToMany:
depCollAct(chain.Parent);
break;
case ModelRelationEntityChainType.ManyToOne:
bag[currEntity].Add(chain.End2);
depCollAct(chain.End2);
break;
default:
depCollAct(chain.End2);
break;
}
}
});
depCollAct(rootEntity);
#endregion
#region Sort by dependencies
while (bag.Count > 0)
{
var currEntity =
bag.FirstOrDefault(x => x.Value.Count == 0);
if (currEntity.Key == null)
{
currEntity = bag.First();
}
bag.Remove(currEntity.Key);
foreach (var entity in bag)
{
entity.Value.Remove(currEntity.Key);
}
res.Add(currEntity.Key);
}
#endregion
return(res);
}
