org.apache.pig.piggybank.evaluation

Class ExtremalTupleByNthField.HelperClass

java.lang.Object

org.apache.pig.EvalFunc<Tuple>

org.apache.pig.piggybank.evaluation.ExtremalTupleByNthField.HelperClass

Enclosing class:

ExtremalTupleByNthField

public static final class ExtremalTupleByNthField.HelperClass
extends EvalFunc<Tuple>

Utility classes and methods

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
HelperClass()
HelperClass(java.lang.String fieldIndexString)
HelperClass(java.lang.String fieldIndexString, java.lang.String order)

Method Summary

Modifier and Type	Method and Description
Tuple	exec(Tuple input) This callback method must be implemented by all subclasses.

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLoadCaster, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, outputSchema, progress, setEndOfAllInput, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

HelperClass

public HelperClass()
            throws ExecException

Throws:

ExecException

HelperClass

public HelperClass(java.lang.String fieldIndexString)
            throws ExecException

Throws:

ExecException

HelperClass

public HelperClass(java.lang.String fieldIndexString,
                   java.lang.String order)
            throws ExecException

Throws:

ExecException

Method Detail

exec

public Tuple exec(Tuple input)
           throws java.io.IOException

Description copied from class: EvalFunc

This callback method must be implemented by all subclasses. This is the method that will be invoked on every Tuple of a given dataset. Since the dataset may be divided up in a variety of ways the programmer should not make assumptions about state that is maintained between invocations of this method.

Specified by:

exec in class EvalFunc<Tuple>

Parameters:

input - the Tuple to be processed.

Returns:

result, of type T.

Throws:

java.io.IOException