er.neo4jadaptor.query.neo4j_eval.retrievers

Class ChainedRetriever<N extends org.neo4j.graphdb.PropertyContainer,V>

java.lang.Object

er.neo4jadaptor.query.neo4j_eval.retrievers.ChainedRetriever<N,V>

Type Parameters:

N -

V -

All Implemented Interfaces:

HasCost, Retriever<N,V>

public class ChainedRetriever<N extends org.neo4j.graphdb.PropertyContainer,V>
extends Object
implements Retriever<N,V>

Chains retrievers r_0, r_1, ..., r_K to simulate getting value by key-path. r_0, r_1, ..., r_{K-1} are expected to on retrieval to return PropertyContainers while r_K can return objects of any type.

Author:

Jedrzej Sobanski

Constructor Summary

Constructors

Constructor and Description
ChainedRetriever(List<Retriever<? extends org.neo4j.graphdb.PropertyContainer,? extends org.neo4j.graphdb.PropertyContainer>> retrievers, Retriever<? extends org.neo4j.graphdb.PropertyContainer,V> lastRetriever)

Method Summary

Modifier and Type	Method and Description
Cost	getCost()
Iterator<V>	retrieve(N node)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ChainedRetriever

public ChainedRetriever(List<Retriever<? extends org.neo4j.graphdb.PropertyContainer,? extends org.neo4j.graphdb.PropertyContainer>> retrievers,
                        Retriever<? extends org.neo4j.graphdb.PropertyContainer,V> lastRetriever)

Method Detail

retrieve

public Iterator<V> retrieve(N node)

Specified by:

retrieve in interface Retriever<N extends org.neo4j.graphdb.PropertyContainer,V>

Returns:

set of values retrieved from the given argument

toString

public String toString()

Overrides:

toString in class Object

getCost

public Cost getCost()

Specified by:

getCost in interface HasCost