com.redhat.lightblue.assoc.ep

Class Join

java.lang.Object

com.redhat.lightblue.assoc.ep.Step<JoinTuple>

com.redhat.lightblue.assoc.ep.Join

public class Join
extends Step<JoinTuple>

Given n source steps, returns n-tuples containing the documents from those steps Input: Result documents from multiple sources Output: List [ ResultDocument ], each element of the list is a ResultDocument from the corresponding source

Nested Class Summary

Nested classes/interfaces inherited from class com.redhat.lightblue.assoc.ep.Step

Step.ToJsonCb<T>

Field Summary

Fields inherited from class com.redhat.lightblue.assoc.ep.Step

block

Constructor Summary

Constructors

Constructor and Description
Join(ExecutionBlock block, Source<ResultDocument>[] sources) Construct the join with the given sources

Method Summary

Modifier and Type	Method and Description
com.fasterxml.jackson.databind.JsonNode	explain(ExecutionContext ctx)
StepResult<JoinTuple>	getResults(ExecutionContext ctx) Asynchronously retrieves results from the sources, and returns a stream that joins them
Source<ResultDocument>[]	getSources() Returns the sources of the join
com.fasterxml.jackson.databind.JsonNode	toJson()

Methods inherited from class com.redhat.lightblue.assoc.ep.Step

getBlock, initialize, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Join

public Join(ExecutionBlock block,
            Source<ResultDocument>[] sources)

Construct the join with the given sources

Method Detail

getSources

public Source<ResultDocument>[] getSources()

Returns the sources of the join

getResults

public StepResult<JoinTuple> getResults(ExecutionContext ctx)

Asynchronously retrieves results from the sources, and returns a stream that joins them

Specified by:

getResults in class Step<JoinTuple>

toJson

public com.fasterxml.jackson.databind.JsonNode toJson()

Specified by:

toJson in class Step<JoinTuple>

explain

public com.fasterxml.jackson.databind.JsonNode explain(ExecutionContext ctx)

Specified by:

explain in class Step<JoinTuple>