com.redhat.lightblue.assoc.ep

Class Step<R>

java.lang.Object

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

Direct Known Subclasses:

AbstractSearchStep, Assemble, Filter, Join, Limit, Project, Skip, SortResults, Unique

public abstract class Step<R>
extends Object

Base class for execution step. Each execution step is associated with an execution block. When the step is created, it registers itself with its block. Step contains the getResults api that computes the results of this step, and returns it for processing by the next step.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Step.ToJsonCb<T>

Field Summary

Fields

Modifier and Type	Field and Description
protected ExecutionBlock	block

Constructor Summary

Constructors

Constructor and Description
Step(ExecutionBlock block)

Method Summary

Modifier and Type	Method and Description
abstract com.fasterxml.jackson.databind.JsonNode	explain(ExecutionContext ctx)
ExecutionBlock	getBlock() Returns the associated block of this step
abstract StepResult<R>	getResults(ExecutionContext ctx) Compute and return a result stream
void	initialize()
abstract com.fasterxml.jackson.databind.JsonNode	toJson()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

block

protected final ExecutionBlock block

Constructor Detail

Step

public Step(ExecutionBlock block)

Method Detail

getResults

public abstract StepResult<R> getResults(ExecutionContext ctx)

Compute and return a result stream

toJson

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

initialize

public void initialize()

explain

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

getBlock

public ExecutionBlock getBlock()

Returns the associated block of this step

toString

public String toString()

Overrides:

toString in class Object