Class BaseListStream0<E>

  extended by org.shapelogic.streams.BaseCommonStream<E>
      extended by org.shapelogic.streams.BaseListCommonStream<E>
          extended by org.shapelogic.streams.BaseListStream0<E>
All Implemented Interfaces:
java.lang.Iterable<E>, java.util.Iterator<E>, CalcValue<E>, ContextGettable, LazyCalc<E>, RecursiveContext, IndexedInputStream0<E>, ListStream<E>, NumberedStream<E>, Stream<E>, StreamProperties
Direct Known Subclasses:

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.

Sami Badawi

Field Summary
Fields inherited from class org.shapelogic.streams.BaseListCommonStream
Fields inherited from class org.shapelogic.streams.BaseCommonStream
_context, _current, _dirty, _last, _maxLast, _name, _nullLegalValue, _parentContext, _query, _value
Constructor Summary
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, getCurrentSize, hasNext, hasNextBase, isCached, isRandomAccess, iterator, next, setLastFromInput
Methods inherited from class org.shapelogic.streams.BaseCommonStream
getContext, getInContext, getIndex, getLast, getMaxLast, getName, getParentContext, getValue, isDeterministic, isDirty, isNullLegalValue, remove, setMaxLast, setNullLegalValue, 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
Methods inherited from interface org.shapelogic.streams.NumberedStream
getIndex, getLast, getMaxLast, setMaxLast
Methods inherited from interface org.shapelogic.calculation.LazyCalc
isDirty, setup
Methods inherited from interface org.shapelogic.calculation.CalcValue
Methods inherited from interface java.util.Iterator

Constructor Detail


public BaseListStream0(int maxLast)


public BaseListStream0()
Method Detail


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>


public java.util.List<E> getList()
Description copied from interface: ListStream
Get underlying list.

Specified by:
getList in interface ListStream<E>
getList in class BaseListCommonStream<E>


public void setList(java.util.List<E> list)
Description copied from interface: ListStream
Get underlying list.

Specified by:
setList in interface ListStream<E>
setList in class BaseListCommonStream<E>

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