IteratorWithHistory (Apache Jena Base)

java.lang.Object
- org.apache.jena.atlas.iterator.IteratorWithHistory<T>

All Implemented Interfaces:

java.util.Iterator<T>
```
public class IteratorWithHistory<T>
extends java.lang.Object
implements java.util.Iterator<T>
```
Remembers the last N yields. See also IteratorWithBuffer, for an iterator that looks ahead to what it will yield.

See Also:

IteratorWithBuffer, PeekIterator, PushbackIterator

Constructor Summary

Constructors
Constructor Description

IteratorWithHistory(java.util.Iterator<T> iter, int N)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`currentSize()`	Return the current size of the history.
`T`	`getPrevious(int idx)`	return the previous i'th element returned by next().
`boolean`	`hasNext()`
`T`	`next()`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Iterator
forEachRemaining, remove

- Constructor Detail
  - IteratorWithHistory
```
public IteratorWithHistory(java.util.Iterator<T> iter,
                           int N)
```
- Method Detail
  - hasNext
```
public boolean hasNext()
```
    Specified by:
    
    hasNext in interface java.util.Iterator<T>
  - next
```
public T next()
```
    Specified by:
    
    next in interface java.util.Iterator<T>
  - getPrevious
```
public T getPrevious(int idx)
```
    return the previous i'th element returned by next(). 0 means last call of next. History is retained after the end of iteration.
    
    Returns:
    
    Element or null for no such element (that is for haven't yielded that many elements).
    
    Throws:
    
    java.lang.IndexOutOfBoundsException - if index is negative.
  - currentSize
```
public int currentSize()
```
    Return the current size of the history. This can be used to tell the difference between an iterator returning null and an iterator that is just short.