internal virtual void Init(long nodeReference, long reference, Read read)
{
/* There are 5 different ways a relationship traversal cursor can be initialized:
*
* 1. From a batched group in a detached way. This happens when the user manually retrieves the relationships
* references from the group cursor and passes it to this method and if the group cursor was based on having
* batched all the different types in the single (mixed) chain of relationships.
* In this case we should pass a reference marked with some flag to the first relationship in the chain that
* has the type of the current group in the group cursor. The traversal cursor then needs to read the type
* from that first record and use that type as a filter for when reading the rest of the chain.
* - NOTE: we probably have to do the same sort of filtering for direction - so we need a flag for that too.
*
* 2. From a batched group in a DIRECT way. This happens when the traversal cursor is initialized directly from
* the group cursor, in this case we can simply initialize the traversal cursor with the buffered state from
* the group cursor, so this method here does not have to be involved, and things become pretty simple.
*
* 3. Traversing all relationships - regardless of type - of a node that has grouped relationships. In this case
* the traversal cursor needs to traverse through the group records in order to get to the actual
* relationships. The initialization of the cursor (through this here method) should be with a FLAGGED
* reference to the (first) group record.
*
* 4. Traversing a single chain - this is what happens in the cases when
* a) Traversing all relationships of a node without grouped relationships.
* b) Traversing the relationships of a particular group of a node with grouped relationships.
*
* 5. There are no relationships - i.e. passing in NO_ID to this method.
*
* This means that we need reference encodings (flags) for cases: 1, 3, 4, 5
*/
RelationshipReferenceEncoding encoding = RelationshipReferenceEncoding.parseEncoding(reference);
switch (encoding.innerEnumValue)
{
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.NONE:
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.GROUP:
StoreCursor.init(nodeReference, reference);
InitFiltering(FilterState.None, false);
break;
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.FILTER_TX_STATE:
// The relationships in tx-state needs to be filtered according to the first relationship we discover,
// but let's not have the store cursor bother with this detail.
StoreCursor.init(nodeReference, clearEncoding(reference));
InitFiltering(FilterState.NotInitialized, false);
break;
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.FILTER:
// The relationships needs to be filtered according to the first relationship we discover
StoreCursor.init(nodeReference, clearEncoding(reference));
InitFiltering(FilterState.NotInitialized, true);
break;
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.NO_OUTGOING_OF_TYPE: // nothing in store, but proceed to check tx-state changes
StoreCursor.init(nodeReference, NO_ID);
InitFiltering(FilterState.fromRelationshipDirection(OUTGOING), false);
this._filterType = ( int )clearEncoding(reference);
break;
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.NO_INCOMING_OF_TYPE: // nothing in store, but proceed to check tx-state changes
StoreCursor.init(nodeReference, NO_ID);
InitFiltering(FilterState.fromRelationshipDirection(INCOMING), false);
this._filterType = ( int )clearEncoding(reference);
break;
case Org.Neo4j.Kernel.Impl.Newapi.RelationshipReferenceEncoding.InnerEnum.NO_LOOP_OF_TYPE: // nothing in store, but proceed to check tx-state changes
StoreCursor.init(nodeReference, NO_ID);
InitFiltering(FilterState.fromRelationshipDirection(LOOP), false);
this._filterType = ( int )clearEncoding(reference);
break;
default:
throw new System.InvalidOperationException("Unknown encoding " + encoding);
}
Init(read);
this._addedRelationships = ImmutableEmptyLongIterator.INSTANCE;
}