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Java Source Code / Java Documentation » Development » jga Generic Algorithms » net.sf.jga.fn.algorithm 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


net.sf.jga.fn.algorithm.Accumulate

Accumulate
public class Accumulate extends UnaryFunctor,T> (Code)
Applies a BinaryFunctor to each element in an iteration, and returns the final result. Each member of the collection is passed to the functor along with the previous result. If the two arg constructor is used, then the given value is used on the first invocation of the functor: otherwise the first element of the iteration is consumed and passed as the starting value.

If the iteration was empty, then the result of this function is the starting value or null if no starting value was given.

If no starting value was given, and the iteration has exactly one element, then the element is returned without the BinaryFunctor being used.

To Serialize an Accumulate, the generic parameter T must be serializable.

Copyright © 2003-2005 David A. Hall
author:
   David A. Hall


Inner Class :public interface Visitor extends net.sf.jga.fn.Visitor

Field Summary
final static  longserialVersionUID
    

Constructor Summary
public  Accumulate(BinaryFunctor<T, T, T> fn)
     Builds an Accumulate functor that will use the given functor to process elements in an iteration.
public  Accumulate(T startValue, BinaryFunctor<T, T, T> fn)
     Builds an Accumulate functor that will use the given start value and functor to process elements in an iteration.

Method Summary
public  voidaccept(net.sf.jga.fn.Visitor v)
     Calls the Visitor's visit(Accumulate) method, if it implements the nested Visitor interface.
public  Tfn(Iterator<? extends T> iterator)
     Apply the functor to the elements of the iteration and return the final result.
public  BinaryFunctor<T, T, T>getFunction()
     Returns the functor used to process elements in the iteration.
public  TgetStartValue()
     Returns the start value, or null if no start value was given.
public  booleanhasStartValue()
     Returns true if a start value was passed at construction.
public  StringtoString()
    

Field Detail
serialVersionUID
final static long serialVersionUID(Code)




Constructor Detail
Accumulate
public Accumulate(BinaryFunctor<T, T, T> fn)(Code)
Builds an Accumulate functor that will use the given functor to process elements in an iteration. The first element in the iteration will be used as the start value.



Accumulate
public Accumulate(T startValue, BinaryFunctor<T, T, T> fn)(Code)
Builds an Accumulate functor that will use the given start value and functor to process elements in an iteration. The first element in the iteration will be used as the start value.




Method Detail
accept
public void accept(net.sf.jga.fn.Visitor v)(Code)
Calls the Visitor's visit(Accumulate) method, if it implements the nested Visitor interface.



fn
public T fn(Iterator<? extends T> iterator)(Code)
Apply the functor to the elements of the iteration and return the final result. Results do not accumulate from one invocation to the next: each time this method is called, the accumulation starts over with the given start value.



getFunction
public BinaryFunctor<T, T, T> getFunction()(Code)
Returns the functor used to process elements in the iteration.



getStartValue
public T getStartValue()(Code)
Returns the start value, or null if no start value was given.



hasStartValue
public boolean hasStartValue()(Code)
Returns true if a start value was passed at construction.



toString
public String toString()(Code)



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