org.apache.pig.impl.builtin
Class ShellBagEvalFunc

java.lang.Object
  extended by org.apache.pig.EvalFunc<DataBag>
      extended by org.apache.pig.impl.builtin.ShellBagEvalFunc

public class ShellBagEvalFunc
extends EvalFunc<DataBag>


Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
returnType
 
Constructor Summary
ShellBagEvalFunc(String cmd)
           
 
Method Summary
 void exec(Tuple input, DataBag output)
          This callback method must be implemented by all subclasses.
 void finish()
          Placeholder for cleanup to be performed at the end.
 boolean isAsynchronous()
          This function should be overriden to return true for functions that return their values asynchronously.
 
Methods inherited from class org.apache.pig.EvalFunc
getReturnType, outputSchema, progress
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ShellBagEvalFunc

public ShellBagEvalFunc(String cmd)
Method Detail

exec

public void exec(Tuple input,
                 DataBag output)
          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<DataBag>
Parameters:
input - the Tuple to be processed.
Throws:
IOException

finish

public void finish()
Description copied from class: EvalFunc
Placeholder for cleanup to be performed at the end. User defined functions can override.

Overrides:
finish in class EvalFunc<DataBag>

isAsynchronous

public boolean isAsynchronous()
Description copied from class: EvalFunc
This function should be overriden to return true for functions that return their values asynchronously.

Overrides:
isAsynchronous in class EvalFunc<DataBag>
Returns:


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