org.shapelogic.streams
Class BaseListStream0<E>

java.lang.Object
  org.shapelogic.streams.BaseListCommonStream<E>
      org.shapelogic.streams.BaseListStream0<E>

All Implemented Interfaces:

java.lang.Iterable<E>, java.util.Iterator<E>, CalcValue<E>, ContextGettable, InContexts, LazyCalc<E>, IndexedInputStream0<E>, ListStream<E>, NumberedStream<E>, Stream<E>, StreamProperties

Direct Known Subclasses:

NaturalNumberStream, PrimeNumberStream

public abstract class BaseListStream0<E>
extends BaseListCommonStream<E>
implements IndexedInputStream0<E>

Implementation of ListStream.
Close to
1: a lazy stream.
2: a UNIX pipe.

This is close to org.apache.commons.collections.list.LazyList, but that takes a factory to calculate next element, and that works badly here. How should a step work?
Normally call the hasNext, in order for this to work it would have to do the calculation.

So _current should be the last element that has been returned.

So when you call hasNext it will add that element to the list. When you call next it will bump the counter up one element if goes too high then do the calculation. At the end it will get to a point where the calculation fails. At that point last will be set to the current element. I will ignore synchronization to begin with.

Author:

Sami Badawi

Field Summary

Fields inherited from class org.shapelogic.streams.BaseListCommonStream

_contexts, _current, _dirty, _last, _list, _maxLast, _name, _query, _value

Constructor Summary

BaseListStream0()

BaseListStream0(int maxLast)

Method Summary

java.util.List<E>	getList() Get underlying list.
E	invokeIndex(int index) Calculate the value at an index.
void	setList(java.util.List<E> list) Get underlying list.

Methods inherited from class org.shapelogic.streams.BaseListCommonStream

calcAddNext, get, getContext, getContexts, getCurrentSize, getInContext, getIndex, getLast, getMaxLast, getName, getValue, hasNext, hasNextBase, isCached, isContextBased, isDeterministic, isDirty, isRandomAccess, iterator, next, remove, setMaxLast, setup

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.shapelogic.streams.IndexedInputStream0

invoke

Constructor Detail

BaseListStream0

public BaseListStream0(int maxLast)

BaseListStream0

public BaseListStream0()

Method Detail

invokeIndex

public E invokeIndex(int index)

Description copied from class: BaseListCommonStream

Calculate the value at an index.
So it gets the needed input value and call the appropriate invoke function.
Can this be used for a filter call?
The index does not make sense for a filter since you do not know where the input is coming from. So maybe just ignore it.
This is a little messy but less messy that what is there now.

Specified by:

invokeIndex in class BaseListCommonStream<E>

getList

public java.util.List<E> getList()

Description copied from interface: ListStream

Get underlying list.

Specified by:

getList in interface ListStream<E>

Overrides:

getList in class BaseListCommonStream<E>

setList

public void setList(java.util.List<E> list)

Description copied from interface: ListStream

Get underlying list.

Specified by:

setList in interface ListStream<E>

Overrides:

setList in class BaseListCommonStream<E>