er.neo4jadaptor.query.neo4j_eval.retrievers

Interface Retriever<Arg,Value>

Type Parameters:

Arg - argument type

Value - type of values in returned set

All Superinterfaces:

HasCost

All Known Implementing Classes:

AttributeRetriever, ChainedRetriever, ForeignKeyValue, LowercaseRetriever, NodeToJoinRelationshipRetriever, NodeToNodeRetriever, PrimaryKeyRetriever, RelationshipRetriever, RelationshipToNode

public interface Retriever<Arg,Value>
extends HasCost

For an object retrieves a value being a set of objects of some type. In other words it's a function (in mathematical terms) f:Arg -> {x:Value} (result is a set!). It is allowed to return an empty set.

Author:

Jedrzej Sobanski

Method Summary

Modifier and Type	Method and Description
Iterator<Value>	retrieve(Arg arg)

Methods inherited from interface er.neo4jadaptor.query.neo4j_eval.HasCost

getCost

Method Detail

retrieve

Iterator<Value> retrieve(Arg arg)

Parameters:

arg -

Returns:

set of values retrieved from the given argument