|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object org.shapelogic.streams.BaseCommonStream<E> org.shapelogic.streams.BaseCommonNumberedStream<E>
public abstract class BaseCommonNumberedStream<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.
I think that there could be a _nextElement that is calculated when hasNext()
is called. When next is called check if this exist and return it. After that
set it to null.
Field Summary |
---|
Fields inherited from class org.shapelogic.streams.BaseCommonStream |
---|
_context, _current, _dirty, _last, _maxLast, _name, _nullLegalValue, _parentContext, _query, _value |
Constructor Summary | |
---|---|
BaseCommonNumberedStream()
|
Method Summary | |
---|---|
protected boolean |
calcAddNext()
Try to calculate one more, independent of the _current. |
E |
get(int inputIndex)
Get next element without advancing _current. |
boolean |
hasNext()
|
boolean |
hasNextBase()
|
abstract E |
invokeIndex(int index)
Calculate the value at an index. |
boolean |
isCached()
If there is a list that contains all the results. |
boolean |
isRandomAccess()
If you can calculate 1 element independent of other elements. |
E |
next()
Get next element and advance _current. |
protected void |
setLast(int index)
|
Methods inherited from class org.shapelogic.streams.BaseCommonStream |
---|
getContext, getInContext, getIndex, getLast, getMaxLast, getName, getParentContext, getValue, isDeterministic, isDirty, isNullLegalValue, remove, setLastFromInput, setMaxLast, setNullLegalValue, setup |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public BaseCommonNumberedStream()
Method Detail |
---|
public abstract E invokeIndex(int index)
invokeIndex
in class BaseCommonStream<E>
public boolean hasNext()
protected boolean calcAddNext()
calcAddNext
in class BaseCommonStream<E>
public boolean hasNextBase()
public E next()
protected void setLast(int index)
public E get(int inputIndex)
public boolean isRandomAccess()
StreamProperties
public boolean isCached()
|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |