/// <summary>
/// Gets the parent for the given entity and link.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
public object GetParent(object entity, ChildToParentEntityLink link, EntityField[] fields)
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (link == null)
{
throw new ArgumentNullException("link");
}
if (fields == null)
{
throw new ArgumentNullException("fields");
}
// check...
if (EntityType == null)
{
throw new ArgumentNullException("EntityType");
}
this.EntityType.AssertIsOfType(entity);
// get the link type...
if (link.ParentEntityType == null)
{
throw new ArgumentNullException("link.ParentEntityType");
}
// do we cache?
//if (link.ParentEntityType.HasCache)
// return this.GetParentFromCache(entity, link, link.ParentEntityType, link.ParentEntityType.Cache);
//else
return(this.LoadParent(entity, link));
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="Link"></param>
public ChildToParentEntityLinkPropertyDescriptor(ChildToParentEntityLink link) : base(link.Name, new Attribute[] {})
{
if (link == null)
{
throw new ArgumentNullException("link");
}
// set...
_link = link;
}
/// <summary>
/// Gets the parent for the given entity.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
protected override object LoadParent(object entity, ChildToParentEntityLink link)
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (link == null)
{
throw new ArgumentNullException("link");
}
// defer...
return(SqlFilter.CreateGetParentFilter(entity, link).ExecuteEntity());
}
/// <summary>
/// Gets the parent for the given entity and link.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
public object GetParent(object entity, ChildToParentEntityLink link)
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (EntityType == null)
{
throw new ArgumentNullException("EntityType");
}
this.EntityType.AssertIsOfType(entity);
// return...
return(((Entity)entity).GetParent(link));
}
/// <summary>
/// Sets the parent for the given entity and link.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
public void SetParent(object entity, ChildToParentEntityLink link, object newParent)
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (EntityType == null)
{
throw new ArgumentNullException("EntityType");
}
this.EntityType.AssertIsOfType(entity);
// set...
((Entity)entity).SetParent(link, newParent);
}
/// <summary>
/// Pushes a value back down to the underlying field.
/// </summary>
/// <param name="field"></param>
/// <param name="value"></param>
private void PushValue(ChildToParentEntityLink link, object value)
{
if (link == null)
{
throw new ArgumentNullException("link");
}
// get storage...
IEntityStorage storage = this.Storage;
if (storage == null)
{
throw new ArgumentNullException("storage");
}
// set...
storage.SetParent(this.Entity, link, value);
}
/// <summary>
/// Pulls the value from the entity.
/// </summary>
/// <param name="field"></param>
/// <returns></returns>
private object PullValue(ChildToParentEntityLink link)
{
if (link == null)
{
throw new ArgumentNullException("link");
}
// check...
if (Entity == null)
{
throw new ArgumentNullException("Entity");
}
// get persistence...
IEntityStorage storage = this.Storage;
if (storage == null)
{
throw new ArgumentNullException("storage");
}
// get...
return(storage.GetParent(this.Entity, link));
}
///// <summary>
///// Gets the parent object from the cache.
///// </summary>
///// <param name="entity"></param>
///// <param name="link"></param>
///// <returns></returns>
//private object GetParentFromCache(object entity, ChildToParentEntityLink link, EntityType parentEntityType, EntityCache parentCache)
//{
// if(entity == null)
// throw new ArgumentNullException("entity");
// if(link == null)
// throw new ArgumentNullException("link");
// if(parentEntityType == null)
// throw new ArgumentNullException("parentEntityType");
// if(parentCache == null)
// throw new ArgumentNullException("parentCache");
// // what are we trying to get?
// EntityField[] linkFields = link.GetLinkFields();
// if (linkFields == null)
// throw new InvalidOperationException("'linkFields' is null.");
// if (linkFields.Length != 1)
// throw new InvalidOperationException("'linkFields' is an invalid length.");
// // get the values...
// if(EntityType.Storage == null)
// throw new ArgumentNullException("EntityType.Storage");
// object[] foreignKey = this.EntityType.Storage.GetValues(entity, linkFields);
// // contains?
// object parent = parentCache[foreignKey[0]];
// if(parent == null)
// parent = this.LoadParent(entity, link);
// // return...
// return parent;
//}
/// <summary>
/// Loads the parent entity from the underlying store.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
protected abstract object LoadParent(object entity, ChildToParentEntityLink link);
/// <summary>
/// Gets the parent for the given entity and link.
/// </summary>
/// <param name="entity"></param>
/// <param name="link"></param>
/// <returns></returns>
public object GetParent(object entity, ChildToParentEntityLink link)
{
return(this.GetParent(entity, link, new EntityField[] {}));
}
