org.apache.pig.piggybank.evaluation.string
Class Stuff

java.lang.Object
  extended by org.apache.pig.EvalFunc<String>
      extended by org.apache.pig.piggybank.evaluation.string.Stuff

public class Stuff
extends EvalFunc<String>

Given a string, this UDF replaces a substring given its starting index and length with the given replacement string. If the the last argument is null, the specified part of the string gets deleted. B = FOREACH A GENERATE Stuff($0, 10, 4, 'Pie') If $0 is "Chocolate Cake" then the UDF will return "Chocolate Pie"


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
Stuff()
           
 
Method Summary
 String exec(Tuple input)
          This callback method must be implemented by all subclasses.
 Schema outputSchema(Schema input)
          Report the schema of the output of this UDF.
 
Methods inherited from class org.apache.pig.EvalFunc
finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, isAsynchronous, progress, 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

Stuff

public Stuff()
Method Detail

exec

public String exec(Tuple input)
            throws 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<String>
Parameters:
input - the Tuple to be processed.
Returns:
result, of type T.
Throws:
IOException

outputSchema

public Schema outputSchema(Schema input)
Description copied from class: EvalFunc
Report the schema of the output of this UDF. Pig will make use of this in error checking, optimization, and planning. The schema of input data to this UDF is provided.

The default implementation interprets the OutputSchema annotation, if one is present. Otherwise, it returns null (no known output schema).

Overrides:
outputSchema in class EvalFunc<String>
Parameters:
input - , schema of the input data
Returns:
output schema


Copyright © 2007-2012 The Apache Software Foundation