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de.cm.frw.core.fun.impl
Class Stream

java.lang.Object
  extended by de.cm.frw.core.fun.impl.Stream
All Implemented Interfaces:
java.lang.Iterable, java.util.Iterator
Direct Known Subclasses:
Stream.Filtered, Stream.Lazy, Stream.Range
public abstract class Stream
extends java.lang.Object
implements java.lang.Iterable, java.util.Iterator

Stream class implements Iterator and supports lazy evaluation insofar as next() may be implemented to calculate the next element on demand. Memoization (or caching) will be implemented here, too. Constructor parameter will allow for turning memoization on or of. The Iterator.remove() method is implemented to have no effect, but may be redefined in derived classes. Maybe should have an implementation if memoization is active, to remove the result pointed at, from memoized results ... not clear if useful ...

Author:
cm

Nested Class Summary
static class Stream.Filtered
           
static class Stream.Lazy
           
static class Stream.Range
           
static class Stream.SimplePair
          This would be called an cons cell in Lisp: (cons a b) = new Pair(a, b) (car (cons a b)) = a = (new Pair(a, b)).first() (cdr (cons a b)) = b = (new Pair(a, b)).second()
 
Constructor Summary
Stream()
           
 
Method Summary
static Stream filter(Predicate p, Stream s)
          Takes a predicate p and a stream s and returns a filtered stream, i.e.
 java.util.Iterator iterator()
           
static void main(java.lang.String[] args)
           
abstract  java.lang.Object next()
           
 void remove()
           
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.util.Iterator
hasNext
 

Constructor Detail

Stream

public Stream()
Method Detail

filter

public static Stream filter(Predicate p,
                            Stream s)
Takes a predicate p and a stream s and returns a filtered stream, i.e. a stream of the elements in s, where p is true. Short for new Stream.Filtered(p, s);

Parameters:
p - the predicate for filtering
s - the stream
Returns:
a new instance of the class Stream.Filtered using p and s

main

public static void main(java.lang.String[] args)
Parameters:
args -

iterator

public java.util.Iterator iterator()
Specified by:
iterator in interface java.lang.Iterable

next

public abstract java.lang.Object next()
Specified by:
next in interface java.util.Iterator

remove

public void remove()
Specified by:
remove in interface java.util.Iterator
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