/// <summary>
/// Checks if the entities are IReferenceByHiveId and of the same type if so returns true if the Ids match, otherwise false.
/// </summary>
/// <param name="op"></param>
/// <param name="objectToCompare"></param>
/// <returns></returns>
internal static bool EntitiesAreEqual(this LinearHiveIndexOperation op, object objectToCompare)
{
if (ReferenceEquals(op.Entity, objectToCompare))
{
return(true);
}
var entityToCompare = objectToCompare as IReferenceByHiveId;
if (entityToCompare == null)
{
return(false);
}
var entity = op.Entity as IReferenceByHiveId;
if (entity == null)
{
return(false);
}
if (entity.GetType() != objectToCompare.GetType())
{
return(false);
}
if (entityToCompare.Id.IsNullValueOrEmpty() || entity.Id.IsNullValueOrEmpty())
{
return(false);
}
return(entity.Id.Value.Equals(entityToCompare.Id.Value));
}
/// <summary>
/// Removes the relation.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="transaction"></param>
public void PerformRemoveRelation(IRelationById item, ExamineTransaction transaction)
{
Mandate.ParameterNotNull(item, "item");
var delete = new LinearHiveIndexOperation()
{
OperationType = IndexOperationType.Delete,
Id = new Lazy <string>(item.GetCompositeId)
};
transaction.EnqueueIndexOperation(delete);
}
/// <summary>
/// Detects if the Entity of the operation already exists in the queue list, if it does and it has been changed
/// then this removes that operation from the queue list and returns true so that the newer version is added to the
/// end of the list. If the item already exists in the queue but the entity has not been changed then it leaves the
/// original in the queue list. If the Entity doesn't exist in the queue then returns true so that it's added.
/// </summary>
/// <param name="indexOps"></param>
/// <param name="op"></param>
/// <returns>
/// Returns true if the operation is a Delete operation.
/// then Returns false if the Entity is null.
/// then Returns false if the item was found in the queue list.
/// then Returns false if the item was not found in the queue list but has not been changed (not IsDirty())
/// then Returns true if the item was not found in the queue list and either has been changed or does not implement ICanBeDirty.
/// </returns>
internal static bool ShouldAddNewQueueItem(this List<LinearHiveIndexOperation> indexOps, LinearHiveIndexOperation op)
{
//always add delete ops
if (op.OperationType == IndexOperationType.Delete)
return true;
//if its not a Delete, the Entity should never be null
if (op.Entity == null)
return false;
//if (op.IsRevision())
//{
// return true;
//}
//checks if the operation exists by reference or by id
var existingOperation = indexOps.Where(x => op.OperationType == IndexOperationType.Add
&& (op.EntitiesAreEqual(x.Entity))).SingleOrDefault();
//the item already exists
if (existingOperation != null)
{
var dirtyEntity = op.Entity as ICanBeDirty;
//if the item has been updated then remove the original entry from the queue list so the new version can be
//re-added .
if (dirtyEntity != null && dirtyEntity.IsDirty())
{
indexOps.Remove(existingOperation);
return true;
}
//the item hasn't changed so leave the original
return false;
}
return true;
}
/// <summary>
/// Detects if the Entity of the operation already exists in the queue list, if it does and it has been changed
/// then this removes that operation from the queue list and returns true so that the newer version is added to the
/// end of the list. If the item already exists in the queue but the entity has not been changed then it leaves the
/// original in the queue list. If the Entity doesn't exist in the queue then returns true so that it's added.
/// </summary>
/// <param name="indexOps"></param>
/// <param name="op"></param>
/// <returns>
/// Returns true if the operation is a Delete operation.
/// then Returns false if the Entity is null.
/// then Returns false if the item was found in the queue list.
/// then Returns false if the item was not found in the queue list but has not been changed (not IsDirty())
/// then Returns true if the item was not found in the queue list and either has been changed or does not implement ICanBeDirty.
/// </returns>
internal static bool ShouldAddNewQueueItem(this List <LinearHiveIndexOperation> indexOps, LinearHiveIndexOperation op)
{
//always add delete ops
if (op.OperationType == IndexOperationType.Delete)
{
return(true);
}
//if its not a Delete, the Entity should never be null
if (op.Entity == null)
{
return(false);
}
//if (op.IsRevision())
//{
// return true;
//}
//checks if the operation exists by reference or by id
var existingOperation = indexOps.Where(x => op.OperationType == IndexOperationType.Add &&
(op.EntitiesAreEqual(x.Entity))).SingleOrDefault();
//the item already exists
if (existingOperation != null)
{
var dirtyEntity = op.Entity as ICanBeDirty;
//if the item has been updated then remove the original entry from the queue list so the new version can be
//re-added .
if (dirtyEntity != null && dirtyEntity.IsDirty())
{
indexOps.Remove(existingOperation);
return(true);
}
//the item hasn't changed so leave the original
return(false);
}
return(true);
}
/// <summary>
/// Checks if the operation is for a "Relation"
/// </summary>
/// <param name="op"></param>
/// <returns></returns>
internal static bool IsRelation(this LinearHiveIndexOperation op)
{
return(op.OperationType == IndexOperationType.Add &&
op.ItemCategory == "Relation");
}
/// <summary>
/// Checks if the Entity assigned to the operation is a Revision{T}
/// </summary>
/// <param name="op"></param>
/// <returns></returns>
internal static bool IsRevision(this LinearHiveIndexOperation op)
{
return(op.OperationType == IndexOperationType.Add &&
op.Entity != null &&
op.Entity.GetType().IsOfGenericType(typeof(Revision <>)));
}
/// <summary>
/// Ensures all of the revision fields and data is stored in the index operation
/// </summary>
/// <param name="s"></param>
/// <param name="t"></param>
internal void EnsureRevisionDataForIndexOperation <TEntity>(Revision <TEntity> s, LinearHiveIndexOperation t)
where TEntity : class, IVersionableEntity
{
//now we need to update the ids, NOTE: the __NodeId is a composite id!
t.Id = new Lazy <string>(() => s.Item.Id.Value.ToString() + "," + s.MetaData.Id.Value.ToString());
t.AddOrUpdateField(FixedRevisionIndexFields.RevisionId, new Lazy <string>(() => s.MetaData.Id.Value.ToString()));
//we also need to make sure the entity property is set to the Revision<TypedEntity> not just TypedEntity
t.Entity = s;
//ensure that the revision status type is stored in a document
EnsureRevisionStatus(s.MetaData.StatusType);
//add the revision status id
t.AddOrUpdateField(FixedRevisionIndexFields.RevisionStatusId, s.MetaData.StatusType.Id.Value.ToString());
t.AddOrUpdateField(FixedRevisionIndexFields.RevisionStatusAlias, s.MetaData.StatusType.Alias);
}
/// <summary>
/// Performs the delete.
/// </summary>
/// <param name="id">The id.</param>
/// <param name="transaction"></param>
/// <remarks>
/// This will lookup all all related entities and remove them from the index
/// </remarks>
public void PerformDelete(string id, ExamineTransaction transaction)
{
Mandate.ParameterNotNullOrEmpty(id, "id");
//NOTE: The below deletion process relies on having unique GUID ids across the board,
// if you want to support int Ids, then we'll need to lookup the item type first
// and delete different things based on that, i chose not to do that because
// if for some reason the item with the Id that we're deleting isn't there then
// any related instances will never be deleted whereas doing the below will delete all
// related entities regardless.
Action <IEnumerable <SearchResult> > addItemsToDeleteQueue = x =>
{
foreach (var r in x)
{
var r1 = r;
transaction.EnqueueIndexOperation(new LinearHiveIndexOperation
{
OperationType = IndexOperationType.Delete,
Id = new Lazy <string>(() => r1.Id)
});
}
};
//First, check if there's relations for this id and remove any relations found
var relations = ExamineManager.Search(
ExamineManager.CreateSearchCriteria()
.Should()
.Id(id, FixedRelationIndexFields.SourceId)
.Should()
.Id(id, FixedRelationIndexFields.DestinationId).Compile());
addItemsToDeleteQueue(relations);
//next, check if there's any items (TypedEntity, AttributeDefinition, AttributeGroup) assigned to a schema by this id,
// this will also delete all revisions of TypedEntity too
var entities = ExamineManager.Search(
ExamineManager.CreateSearchCriteria()
.Should()
.Id(id, FixedIndexedFields.SchemaId)
.Should()
.Id(id, FixedIndexedFields.EntityId)
.Compile());
addItemsToDeleteQueue(entities);
//now, check if the item being deleted is an attribute type, if it is we need to remove all AttributeDefinitions associated
// with it and then all TypedAttribute fields belonging to the TypedEntity that reference these AttributeDefinitions
var attributeDefs = ExamineManager.Search(
ExamineManager.CreateSearchCriteria()
.Must()
.Id(id, FixedIndexedFields.AttributeTypeId)
.Must()
.EntityType <AttributeDefinition>()
.Compile());
addItemsToDeleteQueue(attributeDefs);
//now that we have the attribute defintions related to the typed attribute being deleted, we need to actually create new revisions
// for any entity that had a schemas with these definitions on them.
var schemaIds = attributeDefs.Select(x => x.Fields[FixedIndexedFields.SchemaId]).Distinct();
foreach (var schemaId in schemaIds)
{
var criteria = ExamineManager.CreateSearchCriteria()
.Must().EntityType <TypedEntity>()
.Must().Id(schemaId, FixedIndexedFields.SchemaId)
//need to lookup latest because when we're supporting revisions, we will have more than one version of a TypedEntity
.Must().Range(FixedRevisionIndexFields.IsLatest, 1, 1);
var latest = FilterLatestTypedEntities(
ExamineManager.Search(criteria.Compile()));
//now that we have the latest TypedEntity for any Schema that had an AttributeDefinition on it that we are deleting
// because we are deleting it's TypedAttribute, we need to make a new revision of
//NOTE: If for some reason Revisions are disabled, this wont work
foreach (var l in latest)
{
//now that we have an entity, we'll loop through the attribute defs were removing an ensure it's fields are removed
foreach (var d in attributeDefs)
{
//remove all attributes starting with the prefix and attribute def alias
var d1 = d;
l.Fields.RemoveAll(x => x.Key.StartsWith(FixedAttributeIndexFields.AttributePrefix + d1.Fields[FixedIndexedFields.Alias]));
//conver the fields to be used in an index operation
var opFields = l.Fields.ToLazyDictionary(x => new ItemField(x));
//update some manual fields like the dates and revision ids
StoreDateTimeOffset(FixedIndexedFields.UtcModified, opFields, DateTimeOffset.UtcNow);
var revId = Guid.NewGuid().ToString("N");
opFields.AddOrUpdate(FixedRevisionIndexFields.RevisionId,
new Lazy <ItemField>(() => new ItemField(revId)),
(key, o) => new Lazy <ItemField>(() => new ItemField(revId)));
//need to generate a new id (which is composite)
var l1 = l;
var op = new LinearHiveIndexOperation
{
OperationType = IndexOperationType.Add,
Id = new Lazy <string>(() => l1.Fields[FixedIndexedFields.EntityId] + "," + revId),
Fields = opFields
};
//create the new revision without the fields
transaction.EnqueueIndexOperation(op);
}
}
}
//finally, lookup the item itself and remove it
var item = ExamineManager.Search(ExamineManager.CreateSearchCriteria().Must().Id(id).Compile());
addItemsToDeleteQueue(item);
}
