cascading.pipe

Class Operator

java.lang.Object

cascading.pipe.Pipe

cascading.pipe.Operator

All Implemented Interfaces:

FlowElement, ScopedElement, Traceable, java.io.Serializable

Direct Known Subclasses:

Each, Every

public abstract class Operator
extends Pipe

An Operator is a type of Pipe. Operators pass specified arguments to a given BaseOperation.

The argFields value select the input fields used by the operation. By default the whole input Tuple is passes as arguments. The outFields value select the fields in the result Tuple returned by this Pipe. By default, the operation results of the given operation replace the input Tuple.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Fields	argumentSelector Field argumentSelector
protected Operation	operation Field operation
protected Fields	outputSelector Field outputSelector
protected PlannerLevel	plannerLevel Field assertionLevel

Fields inherited from class cascading.pipe.Pipe

configDef, name, nodeConfigDef, parent, previous, stepConfigDef

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Operator(Operation operation)
protected	Operator(Pipe previous, Fields argumentSelector, Operation operation)
protected	Operator(Pipe previous, Fields argumentSelector, Operation operation, Fields outputSelector)
protected	Operator(Pipe previous, Fields argumentSelector, PlannerLevel plannerLevel, PlannedOperation operation, Fields outputSelector)
protected	Operator(Pipe previous, Operation operation)
protected	Operator(Pipe previous, Operation operation, Fields outputSelector)
protected	Operator(Pipe previous, PlannerLevel plannerLevel, PlannedOperation operation, Fields outputSelector)
protected	Operator(java.lang.String name, Fields argumentSelector, Operation operation)
protected	Operator(java.lang.String name, Fields argumentSelector, Operation operation, Fields outputSelector)
protected	Operator(java.lang.String name, Fields argumentSelector, PlannerLevel plannerLevel, PlannedOperation operation, Fields outputSelector)
protected	Operator(java.lang.String name, Operation operation)
protected	Operator(java.lang.String name, Operation operation, Fields outputSelector)
protected	Operator(java.lang.String name, PlannerLevel plannerLevel, PlannedOperation operation, Fields outputSelector)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object object)
Fields	getArgumentSelector() Method getArgumentSelector returns the argumentSelector of this Operator object.
Fields	getFieldDeclaration() Method getFieldDeclaration returns the fieldDeclaration of this Operator object.
Operation	getOperation() Method getOperation returns the operation managed by this Operator object.
Fields	getOutputSelector() Method getOutputSelector returns the outputSelector of this Operator object.
PlannerLevel	getPlannerLevel() Method getPlannerLevel returns the plannerLevel of this Operator object.
int	hashCode()
boolean	hasPlannerLevel() Method hasPlannerLevel returns true if this Operator object holds a PlannedOperation object with an associated PlannerLevel level.
abstract Scope	outgoingScopeFor(java.util.Set<Scope> incomingScopes) Method outgoingScopeFor returns the Scope this FlowElement hands off to the next FlowElement.
protected void	printInternal(java.lang.StringBuffer buffer, Scope scope)
protected Fields	resolveRemainderFields(java.util.Set<Scope> incomingScopes, Fields argumentFields)
java.lang.String	toString()
protected void	verifyOperation()

Methods inherited from class cascading.pipe.Pipe

getConfigDef, getHeads, getName, getNodeConfigDef, getParent, getPrevious, getStepConfigDef, getTrace, hasConfigDef, hasNodeConfigDef, hasStepConfigDef, id, named, names, pipes, print, resolveIncomingOperationArgumentFields, resolveIncomingOperationPassThroughFields, setParent

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

operation

protected final Operation operation

Field operation

argumentSelector

protected Fields argumentSelector

Field argumentSelector

outputSelector

protected Fields outputSelector

Field outputSelector

plannerLevel

protected PlannerLevel plannerLevel

Field assertionLevel

Constructor Detail

Operator

protected Operator(Operation operation)

Operator

protected Operator(java.lang.String name,
                   Operation operation)

Operator

protected Operator(java.lang.String name,
                   Operation operation,
                   Fields outputSelector)

Operator

protected Operator(java.lang.String name,
                   Fields argumentSelector,
                   Operation operation)

Operator

protected Operator(java.lang.String name,
                   Fields argumentSelector,
                   Operation operation,
                   Fields outputSelector)

Operator

protected Operator(Pipe previous,
                   Operation operation)

Operator

protected Operator(Pipe previous,
                   Fields argumentSelector,
                   Operation operation)

Operator

protected Operator(Pipe previous,
                   Fields argumentSelector,
                   Operation operation,
                   Fields outputSelector)

Operator

protected Operator(Pipe previous,
                   Operation operation,
                   Fields outputSelector)

Operator

protected Operator(java.lang.String name,
                   PlannerLevel plannerLevel,
                   PlannedOperation operation,
                   Fields outputSelector)

Operator

protected Operator(java.lang.String name,
                   Fields argumentSelector,
                   PlannerLevel plannerLevel,
                   PlannedOperation operation,
                   Fields outputSelector)

Operator

protected Operator(Pipe previous,
                   PlannerLevel plannerLevel,
                   PlannedOperation operation,
                   Fields outputSelector)

Operator

protected Operator(Pipe previous,
                   Fields argumentSelector,
                   PlannerLevel plannerLevel,
                   PlannedOperation operation,
                   Fields outputSelector)

Method Detail

verifyOperation

protected void verifyOperation()

getOperation

public Operation getOperation()

Method getOperation returns the operation managed by this Operator object.

Returns:

the operation (type Operation) of this Operator object.

getArgumentSelector

public Fields getArgumentSelector()

Method getArgumentSelector returns the argumentSelector of this Operator object.

Returns:

the argumentSelector (type Fields) of this Operator object.

getFieldDeclaration

public Fields getFieldDeclaration()

Method getFieldDeclaration returns the fieldDeclaration of this Operator object.

Returns:

the fieldDeclaration (type Fields) of this Operator object.

getOutputSelector

public Fields getOutputSelector()

Method getOutputSelector returns the outputSelector of this Operator object.

Returns:

the outputSelector (type Fields) of this Operator object.

getPlannerLevel

public PlannerLevel getPlannerLevel()

Method getPlannerLevel returns the plannerLevel of this Operator object.

Returns:

the plannerLevel (type PlannerLevel) of this Operator object.

hasPlannerLevel

public boolean hasPlannerLevel()

Method hasPlannerLevel returns true if this Operator object holds a PlannedOperation object with an associated PlannerLevel level.

Returns:

boolean

resolveRemainderFields

protected Fields resolveRemainderFields(java.util.Set<Scope> incomingScopes,
                                        Fields argumentFields)

outgoingScopeFor

public abstract Scope outgoingScopeFor(java.util.Set<Scope> incomingScopes)

Description copied from interface: ScopedElement

Method outgoingScopeFor returns the Scope this FlowElement hands off to the next FlowElement.

Specified by:

outgoingScopeFor in interface ScopedElement

Overrides:

outgoingScopeFor in class Pipe

Parameters:

incomingScopes - of type Set

Returns:

Scope

toString

public java.lang.String toString()

Overrides:

toString in class Pipe

printInternal

protected void printInternal(java.lang.StringBuffer buffer,
                             Scope scope)

Overrides:

printInternal in class Pipe

equals

public boolean equals(java.lang.Object object)

Overrides:

equals in class Pipe

hashCode

public int hashCode()

Overrides:

hashCode in class Pipe