/// <summary>
/// Gets the type of the entity schema data for.
/// </summary>
/// <param name="entityType">Type of the entity.</param>
/// <returns></returns>
private EntityTypeSchemaData GetEntitySchemaDataForType(Type entityType)
{
EntityTypeSchemaData toReturn = null;
_entityTypeSchemaDataPerType.TryGetValue(entityType, out toReturn);
return(toReturn);
}
/// <summary>
/// Adds the explorer item for the entity with the name specified to the entity's schemadata object. If it's already present,
/// it simply returns that explorer item.
/// </summary>
/// <param name="entityName">Name of the entity.</param>
private void AddEntityExplorerItem(string entityName)
{
EntityTypeSchemaData entitySchemaData = null;
if (!_entityTypeSchemaDataPerEntityName.TryGetValue(entityName, out entitySchemaData))
{
return;
}
if (entitySchemaData.RelatedExplorerItem != null)
{
return;
}
// not yet created.
var entityNameForElement = entityName.Replace("Entity", "");
var suffix = string.Empty;
if (!string.IsNullOrEmpty(entitySchemaData.SuperTypeName))
{
suffix = string.Format(" (Sub-type of '{0}')", entitySchemaData.SuperTypeName.Replace("Entity", ""));
}
entitySchemaData.RelatedExplorerItem = new ExplorerItem(entityNameForElement + suffix, ExplorerItemKind.QueryableObject, ExplorerIcon.Table)
{
DragText = entityNameForElement,
IsEnumerable = true,
Children = new List <ExplorerItem>()
};
var dummyInstance = entitySchemaData.Factory.Create();
DiscoverEntityFields(dummyInstance, entitySchemaData);
}
/// <summary>
/// Discovers the entity fields for the entity type specified.
/// </summary>
/// <param name="instance">The instance.</param>
/// <param name="resourceType">Type of the resource.</param>
/// <param name="entityType">Type of the entity.</param>
/// <param name="customState">State of the custom.</param>
private void DiscoverEntityFields(IEntityCore instance, EntityTypeSchemaData entitySchemaData)
{
var instanceFieldsToTravese = instance.Fields
.Where(f => !f.IsPrimaryKey || (f.IsPrimaryKey && (f.ActualContainingObjectName == f.ContainingObjectName)))
.ToDictionary(f => f.Name);
var allProperties = TypeDescriptor.GetProperties(entitySchemaData.EntityType).Cast <PropertyDescriptor>();
var propertiesToTraverse = allProperties.Where(p => instanceFieldsToTravese.ContainsKey(p.Name));
var childrenCollection = entitySchemaData.RelatedExplorerItem.Children;
List <ExplorerItem> toAdd = new List <ExplorerItem>();
foreach (PropertyDescriptor property in propertiesToTraverse)
{
var field = instance.Fields[property.Name];
bool isPK = false;
bool isFK = false;
int fieldIndex = -1;
if (field == null)
{
// other property
if (typeof(IEntityCore).IsAssignableFrom(property.PropertyType) || typeof(IEntityCollectionCore).IsAssignableFrom(property.PropertyType))
{
// entity navigator, done later
continue;
}
else
{
if (!property.IsBrowsable)
{
continue;
}
}
}
else
{
isPK = field.IsPrimaryKey;
isFK = field.IsForeignKey;
fieldIndex = field.FieldIndex;
}
string propertyText = property.Name;
if (isFK)
{
propertyText += " (FK)";
}
var icon = isPK ? ExplorerIcon.Key : ExplorerIcon.Column;
if (field.ActualContainingObjectName != field.ContainingObjectName)
{
// inherited field.
propertyText += string.Format(" (Inherited from '{0}')", field.ContainingObjectName.Replace("Entity", ""));
icon = ExplorerIcon.Inherited;
}
toAdd.Add(new ExplorerItem(propertyText, ExplorerItemKind.Property, icon)
{
DragText = property.Name,
Tag = fieldIndex
});
}
childrenCollection.AddRange(toAdd.OrderBy(i => (int)i.Tag).ThenBy(i => i.Text));
}
/// <summary>
/// Gets the schema.
/// </summary>
/// <returns></returns>
internal List <ExplorerItem> GetSchema()
{
VerifyEntityAssemblyVersion();
// We're only interested in the DataSource(2)<TEntity> returning properties.
var queryableProperties = _linqMetaDataType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(p => typeof(IQueryable).IsAssignableFrom(p.PropertyType));
_entityTypeSchemaDataPerEntityName = new Dictionary <string, EntityTypeSchemaData>();
_entityTypeSchemaDataPerType = new Dictionary <Type, EntityTypeSchemaData>();
// first we discover all entity types.
foreach (var property in queryableProperties)
{
if ((!property.PropertyType.IsGenericType) && !typeof(IQueryable).IsAssignableFrom(property.PropertyType))
{
continue;
}
var entityType = property.PropertyType.GetGenericArguments()[0];
ProduceEntityFactoryDelegate(entityType);
var factory = GetFactory(entityType);
if (factory == null)
{
continue;
}
var dummyInstance = factory.Create();
var entitySchemaData = new EntityTypeSchemaData()
{
EntityType = entityType,
Factory = factory,
InheritanceInfo = dummyInstance.GetInheritanceInfo(),
LinqMetaDataProperty = property
};
_entityTypeSchemaDataPerEntityName[dummyInstance.LLBLGenProEntityName] = entitySchemaData;
_entityTypeSchemaDataPerType[entityType] = entitySchemaData;
}
// traverse all entity type schema data objects we've created and recurse over the types to build all property data
foreach (var entityName in _entityTypeSchemaDataPerEntityName.Keys)
{
AddEntityExplorerItem(entityName);
}
// second iteration, we discover all navigators. Because all entity types are known we can simply use the lookups
foreach (var entityStateData in _entityTypeSchemaDataPerEntityName.Values.Distinct())
{
DiscoverEntityNavigators(entityStateData);
}
return(_entityTypeSchemaDataPerType.Values.Select(v => v.RelatedExplorerItem).ToList());
}
/// <summary>
/// Discovers the entity navigators.
/// </summary>
/// <param name="entitySchemaData">The entity schema data.</param>
private void DiscoverEntityNavigators(EntityTypeSchemaData entitySchemaData)
{
var entityType = entitySchemaData.EntityType;
if (entitySchemaData.Factory == null)
{
throw new InvalidOperationException(string.Format("Factory is null in entitySchemaData for entity '{0}'", entitySchemaData.EntityType.FullName));
}
var dummyInstance = entitySchemaData.Factory.Create();
var relationsWithMappedFields = dummyInstance.GetAllRelations().Where(r => !string.IsNullOrEmpty(r.MappedFieldName) && !r.IsHierarchyRelation);
var relationPerMappedFieldName = relationsWithMappedFields.ToDictionary(r => r.MappedFieldName);
var properties = TypeDescriptor.GetProperties(entityType).Cast <PropertyDescriptor>();
var inheritedProperties = new HashSet <PropertyDescriptor>(DetermineInheritedProperties(entitySchemaData.EntityType, properties));
var childrenCollection = entitySchemaData.RelatedExplorerItem.Children;
foreach (PropertyDescriptor property in properties)
{
if (!(typeof(IEntityCore).IsAssignableFrom(property.PropertyType) || typeof(IEntityCollectionCore).IsAssignableFrom(property.PropertyType)))
{
// not an entity navigator,
continue;
}
string suffix = string.Empty;
bool inherited = false;
if (inheritedProperties.Contains(property))
{
suffix = string.Format(" (Inherited from '{0}')", property.ComponentType.Name.Replace("Entity", ""));
inherited = true;
}
// relationMapped can be null, in the case of a m:n navigator.
IEntityRelation relationMapped = null;
relationPerMappedFieldName.TryGetValue(property.Name, out relationMapped);
if (typeof(IEntityCore).IsAssignableFrom(property.PropertyType))
{
var relatedEntitySchemaData = GetEntitySchemaDataForType(property.PropertyType);
// single entity navigator, or property added manually.
if (relationMapped == null)
{
// property added manually, ignore.
continue;
}
var icon = relationMapped.TypeOfRelation == RelationType.ManyToOne ? ExplorerIcon.ManyToOne : ExplorerIcon.OneToOne;
if (inherited)
{
icon = ExplorerIcon.Inherited;
}
childrenCollection.Add(new ExplorerItem(property.Name + suffix, ExplorerItemKind.ReferenceLink, icon)
{
DragText = property.Name,
HyperlinkTarget = relatedEntitySchemaData == null ? null : relatedEntitySchemaData.RelatedExplorerItem
});
continue;
}
if (typeof(IEntityCollectionCore).IsAssignableFrom(property.PropertyType))
{
// collection navigator. We have to determine which entity type is returned from the collection.
// First, check if there's a TypeContainedAttribute on the property. If so, use the type in the attribute. If not,
// try to determine the type using the linq utils method.
Type containedType = null;
var typeContainedAttribute = property.Attributes[typeof(TypeContainedAttribute)] as TypeContainedAttribute;
if ((typeContainedAttribute != null) && typeContainedAttribute.TypeContainedInCollection != null)
{
containedType = typeContainedAttribute.TypeContainedInCollection;
}
else
{
containedType = LinqUtils.DetermineEntityTypeFromEntityCollectionType(property.PropertyType);
}
var relatedEntitySchemaData = GetEntitySchemaDataForType(containedType);
var icon = relationMapped == null ? ExplorerIcon.ManyToMany : ExplorerIcon.OneToMany;
if (inherited)
{
icon = ExplorerIcon.Inherited;
}
childrenCollection.Add(new ExplorerItem(property.Name + suffix, ExplorerItemKind.CollectionLink, icon)
{
DragText = property.Name,
HyperlinkTarget = relatedEntitySchemaData == null ? null : relatedEntitySchemaData.RelatedExplorerItem
});
}
}
}
