internal void AssignEntity(IPersistEntity parent, IPersistEntity entity, ReferenceContext context)
{
if (context.MetaProperty != null && context.MetaProperty.IsDerived)
{
Log.WriteLine("It wasn't possible to add entity {0} as a {1} to parent {2} because it is a derived value",
entity.ExpressType.ExpressName, context.Segment, parent.ExpressType.ExpressName);
return;
}
var index = context.Index == null ? null : new[] { context.Index };
//inverse property
if (context.MetaProperty != null && context.MetaProperty.IsInverse)
{
var remotePropName = context.MetaProperty.InverseAttributeProperty.RemoteProperty;
var entityType = entity.ExpressType;
var remoteProp = GetProperty(entityType, remotePropName);
//it is enumerable inverse
if (remoteProp.EnumerableType != null)
{
var list = remoteProp.PropertyInfo.GetValue(entity, index) as IList;
if (list != null)
{
list.Add(parent);
return;
}
}
//it is a single inverse entity
else
{
remoteProp.PropertyInfo.SetValue(entity, parent, index);
return;
}
Log.WriteLine("It wasn't possible to add entity {0} as a {1} to parent {2}",
entity.ExpressType.ExpressName, context.Segment, entityType.ExpressName);
return;
}
//explicit property
var info = context.PropertyInfo;
if (context.ContextType == ReferenceContextType.EntityList)
{
var list = info.GetValue(parent, index) as IList;
if (list != null)
{
list.Add(entity);
return;
}
}
else
{
if ((context.MetaProperty != null && context.MetaProperty.IsExplicit) || info.GetSetMethod() != null)
{
info.SetValue(parent, entity, index);
return;
}
}
Log.WriteLine("It wasn't possible to add entity {0} as a {1} to parent {2}",
entity.ExpressType.ExpressName, context.Segment, parent.ExpressType.ExpressName);
}
public ForwardReference(IPersistEntity entity, ReferenceContext context, TableStore store)
{
Store = store;
_handle = new XbimInstanceHandle(entity);
Row = context.CurrentRow;
Context = context;
}
private IPersistEntity LoadFromRow(IRow row, ReferenceContext context, IRow lastRow, IPersistEntity lastEntity)
{
var multirow = IsMultiRow(row, context.CMapping, lastRow);
if (multirow)
{
//only add multivalue to the multivalue properties of last entity
var subContexts = context.AllScalarChildren
.Where(c => c.Mapping.MultiRow != MultiRow.None)
.Select(c =>
{
//get to the first list level up or on the base level if it is a scalar list
if (c.ContextType == ReferenceContextType.ScalarList)
{
return(c);
}
while (c != null && c.ContextType != ReferenceContextType.EntityList)
{
c = c.ParentContext;
}
return(c);
})
.Where(c => c != null)
.Distinct();
foreach (var ctx in subContexts)
{
ResolveMultiContext(ctx, lastEntity);
}
return(lastEntity);
}
//get type of the coresponding object from ClassMapping or from a type hint, create instance
return(ResolveContext(context, -1, false));
}
public ForwardReference(XbimInstanceHandle handle, ReferenceContext context, TableStore store)
{
Store = store;
_handle = handle;
Row = context.CurrentRow;
Context = context;
}
private void Join(IPersistEntity entity, ReferenceContext context,
Stack <IPersistEntity> parents)
{
var temp = new Stack <IPersistEntity>();
IPersistEntity parent;
while (parents.Count != 0)
{
parent = parents.Pop();
if (context.ContextType == ReferenceContextType.EntityList)
{
Store.AssignEntity(parent, entity, context);
temp.Push(parent);
break;
}
var e = Store.ResolveContext(context.ParentContext, -1, true);
Store.AssignEntity(e, entity, context);
context = context.ParentContext;
entity = e;
temp.Push(e);
}
//fill parents with the new stuff
while (temp.Count != 0)
{
parent = temp.Pop();
parents.Push(parent);
}
}
private IPersistEntity GetFirstValid(IEnumerable <object> entities, ReferenceContext context)
{
var enumerable = entities as IList <object> ?? entities.ToList();
//if there is only one in the list, retun that one
if (enumerable.Count == 1)
{
return(enumerable.First() as IPersistEntity);
}
if (enumerable.Count == 0)
{
return(null);
}
//if context doesn't have any data at all on any level down
if (!context.HasData)
{
return(null);
}
//this context has scalar data on its level
if (context.ScalarChildren.Any(c => c.Values != null && c.Values.Length > 0))
{
enumerable = enumerable.Where(e => TableStore.IsValidEntity(context, e)).ToList();
//if there is only one in the list, retun that one
if (enumerable.Count == 1)
{
return(enumerable.First() as IPersistEntity);
}
if (enumerable.Count == 0)
{
return(null);
}
}
return(enumerable.FirstOrDefault(e =>
context.EntityChildren.All(c =>
{
var index = c.Index != null ? new[] { c.Index } : null;
var value = c.PropertyInfo.GetValue(e, index);
//this is equivalent of contains any valid
if (c.ContextType == ReferenceContextType.EntityList)
{
var enu = value as IEnumerable <IPersistEntity>;
if (enu == null)
{
return false;
}
return GetFirstValid(enu, c) != null;
}
var ent = value as IPersistEntity;
return ent != null && TableStore.IsValidEntity(c, ent);
})) as IPersistEntity);
}
private ReferenceContext GetReferenceContext(ClassMapping mapping)
{
ReferenceContext context;
if (_referenceContexts.TryGetValue(mapping, out context))
{
return(context);
}
context = new ReferenceContext(this, mapping);
_referenceContexts.Add(mapping, context);
return(context);
}
internal Type GetConcreteType(ReferenceContext context, ICell cell)
{
var cType = context.SegmentType;
if (cType != null && !cType.Type.IsAbstract)
{
return(cType.Type);
}
//use custom type resolver if there is a one which can resolve this type
if (cType != null && Resolvers != null && Resolvers.Any())
{
var resolver = Resolvers.FirstOrDefault(r => r.CanResolve(cType));
if (resolver != null)
{
return(resolver.Resolve(cType.Type, cell, context.CMapping, context.Mapping));
}
}
if (context.PropertyInfo != null)
{
var pType = context.PropertyInfo.PropertyType;
pType = GetNonNullableType(pType);
if (pType.IsValueType || pType == typeof(string))
{
return(pType);
}
if (typeof(IEnumerable).IsAssignableFrom(pType))
{
pType = pType.GetGenericArguments()[0];
if (pType.IsValueType || pType == typeof(string))
{
return(pType);
}
}
if (Resolvers != null && Resolvers.Any())
{
var resolver = Resolvers.FirstOrDefault(r => r.CanResolve(pType));
if (resolver != null)
{
return(resolver.Resolve(pType, cell, context.CMapping, context.Mapping));
}
}
}
Log.WriteLine("It wasn't possible to find a non-abstract type for table {0}, class {1}",
context.CMapping.TableName, context.CMapping.Class);
return(null);
}
/// <summary>
/// Search the model for the entities satisfying the conditions in context
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
internal IEnumerable <IPersistEntity> GetReferencedEntities(ReferenceContext context)
{
var type = context.SegmentType;
//return empty enumeration in case there are identifiers but no data
if (context.TypeHintMapping == null && context.TableHintMapping == null && context.ScalarChildren.Any() && !context.HasData)
{
return(Enumerable.Empty <IPersistEntity>());
}
//we don't have any data so use just a type for the search
return(!context.ScalarChildren.Any() ?
Model.Instances.OfType(type.Name, true) :
Model.Instances.OfType(type.Name, true).Where(e => IsValidEntity(context, e)));
}
private static bool IsValidInContext(ReferenceContext scalar, object entity)
{
var prop = scalar.PropertyInfo;
var vals = scalar.Values;
var eVal = prop.GetValue(entity, null);
if (scalar.ContextType != ReferenceContextType.ScalarList)
{
return(eVal != null && vals.Any(v => v != null && v.Equals(eVal)));
}
var list = eVal as IEnumerable;
return(list != null &&
//it might be a multivalue
list.Cast <object>().All(item => vals.Any(v => v.Equals(item))));
}
internal static bool IsValidEntity(ReferenceContext context, object entity)
{
if (context.ScalarChildren.Count == 0)
{
return(true);
}
//if it might have identifiers but doesn't have a one it can't find any
if (!context.HasData)
{
return(false);
}
return(context.ScalarChildren
.Where(s => s.Values != null && s.Values.Length > 0)
.All(scalar => IsValidInContext(scalar, entity)));
}
private void AddMapping(PropertyMapping pMapping, List <string> segments)
{
if (segments == null || !segments.Any())
{
//this is a leaf
Mapping = pMapping;
return;
}
var segment = segments.First();
var segmentName = segment.Split('\\')[0];
//handle special cases - type hints
switch (segment)
{
case "[table]":
TableHintMapping = pMapping;
return;
case "[type]":
TypeHintMapping = pMapping;
return;
}
var existChild = Children.FirstOrDefault(c => c.Segment == segmentName);
if (existChild != null)
{
existChild.AddMapping(pMapping, segments.GetRange(1, segments.Count - 1));
}
else
{
var child = new ReferenceContext(segment, this, Store, CMapping);
child.AddMapping(pMapping, segments.GetRange(1, segments.Count - 1));
Children.Add(child);
//cache scalar children for optimization
if (child.ContextType == ReferenceContextType.Scalar || child.ContextType == ReferenceContextType.ScalarList)
{
_scalarChildren.Add(child);
}
}
}
private ExpressType GetConcreteType(ReferenceContext context)
{
var cType = context.SegmentType;
if (cType != null && !cType.Type.IsAbstract)
{
return(cType);
}
//use fallback to retrieve a non-abstract type (defined in a configuration file?)
var fbTypeName = context.CMapping.FallBackConcreteType;
if (context.IsRoot && !string.IsNullOrWhiteSpace(fbTypeName))
{
var eType = MetaData.ExpressType(fbTypeName.ToUpper());
if (eType != null && !eType.Type.IsAbstract)
{
return(eType);
}
}
//use custom type resolver if there is a one which can resolve this type
if (cType != null && Resolvers != null && Resolvers.Any())
{
var resolver = Resolvers.FirstOrDefault(r => r.CanResolve(cType));
if (resolver != null)
{
return(resolver.Resolve(cType, context, MetaData));
}
}
Log.WriteLine("It wasn't possible to find a non-abstract type for table {0}, class {1}",
context.CMapping.TableName, context.CMapping.Class);
return(null);
}
/// <summary>
/// Returns true if it exists, FALSE if new entity fas created and needs to be filled in with data
/// </summary>
/// <param name="context"></param>
/// <param name="entity"></param>
/// <param name="type"></param>
/// <param name="scalarIndex">Index to field of values to be used to create the key. If -1 no index is used and all values are used.</param>
/// <returns></returns>
private bool GetOrCreateGlobalEntity(ReferenceContext context, out IPersistEntity entity, ExpressType type, int scalarIndex)
{
type = type ?? GetConcreteType(context);
Dictionary <string, IPersistEntity> entities;
if (!_globalEntities.TryGetValue(type, out entities))
{
entities = new Dictionary <string, IPersistEntity>();
_globalEntities.Add(type, entities);
}
var keys = scalarIndex > -1 ?
context.AllScalarChildren.OrderBy(c => c.Segment)
.Where(c => c.Values != null)
.Select(c =>
{
if (c.Values.Length == 1)
{
return(c.Values[0]);
}
return(c.Values.Length >= scalarIndex + 1 ? c.Values[scalarIndex] : null);
}).Where(v => v != null):
context.AllScalarChildren.OrderBy(c => c.Segment)
.Where(c => c.Values != null)
.SelectMany(c => c.Values.Where(cv => cv != null).Select(v => v.ToString()));
var key = string.Join(", ", keys);
if (entities.TryGetValue(key, out entity))
{
return(true);
}
entity = Model.Instances.New(type.Type);
entities.Add(key, entity);
return(false);
}
private void AddToPath(ReferenceContext targetContext, IPersistEntity parent, IPersistEntity child)
{
//get context path from root entity
var ctxStack = new Stack <ReferenceContext>();
var entityStack = new Stack <IPersistEntity>();
var context = targetContext;
while (!context.IsRoot && context.ContextType != ReferenceContextType.Parent)
{
ctxStack.Push(context);
context = context.ParentContext;
}
var entity = parent;
while (ctxStack.Count != 0)
{
context = ctxStack.Pop();
entityStack.Push(entity);
//browse to the level of the bottom context and call ResolveContext there
var index = context.Index != null ? new[] { context.Index } : null;
var value = context.PropertyInfo.GetValue(entity, index);
if (context.ContextType == ReferenceContextType.Entity)
{
var e = value as IPersistEntity;
//if it is null, create a new one or assign the child
if (e == null)
{
e = context == targetContext ? child : Store.ResolveContext(context, -1, true);
Store.AssignEntity(entity, e, context);
entity = e;
continue;
}
//verify that this is the desired one by the values. If not, create a new one on this level and higher
if (TableStore.IsValidEntity(context, e))
{
entity = e;
continue;
}
//create a new one and assign it higher
e = context == targetContext ? child : Store.ResolveContext(context, -1, true);
Join(e, context, entityStack);
entity = e;
continue;
}
//it should be enumerable
var entities = value as IEnumerable;
if (entities == null)
{
Store.Log.WriteLine("It wasn't possible to browse to the data entry point.");
return;
}
if (context == targetContext)
{
Store.AssignEntity(entity, child, context);
return;
}
//get first valid entity
entity = GetFirstValid(entities.Cast <object>(), context);
//entity = entities.Cast<object>().FirstOrDefault(e => TableStore.IsValidEntity(context, e)) as IPersistEntity;
if (entity != null)
{
continue;
}
//create new entity and assign it on a higher level
entity = Store.ResolveContext(context, -1, true);
AddToPath(context, parent, entity);
}
}
private ReferenceContext(string segment, ReferenceContext parent, TableStore store, ClassMapping cMapping)
{
Store = store;
CMapping = cMapping;
//init lists
Children = new List <ReferenceContext>();
ParentContext = parent;
//try to extract TypeOf part of the path
var parts = segment.Split('\\');
segment = parts[0];
var typeHint = parts.Length > 1 ? parts[1] : null;
Segment = segment;
//set up path type hint if it is defined
if (!string.IsNullOrWhiteSpace(typeHint))
{
PathTypeHint = Store.MetaData.ExpressType(typeHint.ToUpper());
}
if (segment == "parent")
{
PathTypeHint = Store.MetaData.ExpressType(CMapping.ParentClass.ToUpper());
ContextType = ReferenceContextType.Parent;
return;
}
Index = TableStore.GetPropertyIndex(ref segment);
PropertyInfo = Store.GetPropertyInfo(segment, parent.SegmentType, Index);
MetaProperty = Store.GetProperty(parent.SegmentType, segment);
var info = PropertyInfo != null
? PropertyInfo.PropertyType
: (MetaProperty != null
? MetaProperty.EnumerableType ?? MetaProperty.PropertyInfo.PropertyType
: null);
if (info == null)
{
Store.Log.WriteLine("Type {0} doesn't have a property {1}.", parent.PathTypeHint.ExpressName, segment);
return;
}
PropertyTypeHint = Store.MetaData.ExpressType(MetaProperty != null ?
MetaProperty.EnumerableType ?? MetaProperty.PropertyInfo.PropertyType :
(PropertyInfo != null ? PropertyInfo.PropertyType : null)
);
//set up type of the context
var isEnumerable = MetaProperty != null && MetaProperty.EnumerableType != null;
if (isEnumerable)
{
if (MetaProperty.EnumerableType.IsValueType ||
MetaProperty.EnumerableType == typeof(string) ||
typeof(IExpressValueType).IsAssignableFrom(MetaProperty.EnumerableType))
{
ContextType = ReferenceContextType.ScalarList;
}
else
{
ContextType = ReferenceContextType.EntityList;
}
}
else
{
if (info.IsValueType ||
info == typeof(string) ||
typeof(IExpressValueType).IsAssignableFrom(info))
{
ContextType = ReferenceContextType.Scalar;
}
else
{
ContextType = ReferenceContextType.Entity;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="context">Reference context of the data</param>
/// <param name="scalarIndex">Index of value to be used in a value list in case of multi values</param>
/// <param name="onlyScalar"></param>
/// <returns></returns>
internal IPersistEntity ResolveContext(ReferenceContext context, int scalarIndex, bool onlyScalar)
{
IPersistEntity entity = null;
var eType = GetConcreteType(context);
if (IsGlobalType(eType.Type))
{
//it is a global type but there are no values to fill in
if (!context.AllScalarChildren.Any(c => c.Values != null && c.Values.Length > 0))
{
return(null);
}
//it is a global entity and it was filled in with the data before
if (GetOrCreateGlobalEntity(context, out entity, eType, scalarIndex))
{
return(entity);
}
}
//create new entity if new global one was not created
if (entity == null)
{
entity = Model.Instances.New(eType.Type);
}
//scalar values to be set to the entity
foreach (var scalar in context.ScalarChildren)
{
var values = scalar.Values;
if (values == null || values.Length == 0)
{
continue;
}
if (scalar.ContextType == ReferenceContextType.ScalarList)
{
//is should be ItemSet which is always initialized and inherits from IList
var list = scalar.PropertyInfo.GetValue(entity, null) as IList;
if (list == null)
{
continue;
}
foreach (var value in values)
{
list.Add(value);
}
continue;
}
//it is a single value
var val = scalarIndex < 0 ? values[0]: (values.Length >= scalarIndex + 1 ? values[scalarIndex] : null);
if (val != null)
{
scalar.PropertyInfo.SetValue(entity, val, scalar.Index != null ? new[] { scalar.Index } : null);
}
}
if (onlyScalar)
{
return(entity);
}
//nested entities (global, local, referenced)
foreach (var childContext in context.EntityChildren)
{
if (childContext.IsReference)
{
_forwardReferences.Enqueue(new ForwardReference(entity, childContext, this));
continue;
}
if (childContext.ContextType == ReferenceContextType.EntityList)
{
var depth =
childContext.ScalarChildren.Where(c => c.Values != null)
.Select(c => c.Values.Length)
.OrderByDescending(v => v)
.FirstOrDefault();
for (var i = 0; i < depth; i++)
{
var child = depth == 1 ? ResolveContext(childContext, -1, false) : ResolveContext(childContext, i, false);
AssignEntity(entity, child, childContext);
}
continue;
}
//it is a single entity
var cEntity = ResolveContext(childContext, -1, false);
AssignEntity(entity, cEntity, childContext);
}
var parentContext = context.Children.FirstOrDefault(c => c.ContextType == ReferenceContextType.Parent);
if (parentContext != null)
{
_forwardReferences.Enqueue(new ForwardReference(entity, parentContext, this));
}
return(entity);
}
/// <summary>
/// This is used for a multi-row instances where only partial context needs to be processed
/// </summary>
/// <param name="subContext"></param>
/// <param name="rootEntity"></param>
private void ResolveMultiContext(ReferenceContext subContext, IPersistEntity rootEntity)
{
//get context path from root entity
var ctxStack = new Stack <ReferenceContext>();
var context = subContext;
while (context != null)
{
ctxStack.Push(context);
context = context.ParentContext;
}
//use path to get to the bottom of the stact and add the value to it
context = ctxStack.Pop();
var entity = rootEntity;
//stop one level above the original subcontext
while (ctxStack.Peek() != subContext)
{
//browse to the level of the bottom context and call ResolveContext there
var index = context.Index != null ? new[] { context.Index } : null;
var value = context.PropertyInfo.GetValue(rootEntity, index);
if (value == null)
{
Log.WriteLine("It wasn't possible to browse to the data entry point.");
return;
}
if (context.ContextType == ReferenceContextType.Entity)
{
entity = value as IPersistEntity;
continue;
}
var entities = value as IEnumerable;
if (entities == null)
{
Log.WriteLine("It wasn't possible to browse to the data entry point.");
return;
}
foreach (var e in entities)
{
if (!IsValidEntity(context, e))
{
continue;
}
entity = e as IPersistEntity;
break;
}
}
if (subContext.IsReference)
{
var reference = new ForwardReference(entity, subContext, this);
_forwardReferences.Enqueue(reference);
return;
}
if (subContext.ContextType == ReferenceContextType.EntityList)
{
var child = ResolveContext(subContext, -1, false);
AssignEntity(entity, child, subContext);
return;
}
if (subContext.ContextType == ReferenceContextType.ScalarList)
{
var list = subContext.PropertyInfo.GetValue(entity, null) as IList;
if (list != null && subContext.Values != null && subContext.Values.Length > 0)
{
list.Add(subContext.Values[0]);
}
}
}
