Package de.caluga.morphium.aggregation

Class AggregationIterator<T,R>

java.lang.Object

de.caluga.morphium.aggregation.AggregationIterator<T,R>

All Implemented Interfaces:

MorphiumAggregationIterator<T,R>, MorphiumIterator<R>, Iterable<R>, Iterator<R>

public class AggregationIterator<T,R>
extends Object
implements MorphiumAggregationIterator<T,R>

User: Stephan Bösebeck Date: 25.03.16 Time: 22:33

iterating over huge collections using the mongodb internal cursor

Constructor Summary

Constructors

Constructor	Description
AggregationIterator()

Method Summary

Modifier and Type	Method	Description
void	ahead(int jump)	move the cursor position ahead
int	available()	retruns the number of elements now in buffer.
void	back(int jump)	get back some positions
void	close()
Aggregator<T,R>	getAggregator()
List<R>	getCurrentBuffer()	get the current buffer.
int	getCursor()	returns current cursor position
boolean	hasNext()
Iterator<R>	iterator()
R	next()
Map<String,Object>	nextMap()
void	setAggregator(Aggregator<T,R> aggregator)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Details

AggregationIterator

public AggregationIterator()

Method Details

ahead

public void ahead(int jump)

Description copied from interface: MorphiumIterator

move the cursor position ahead

Specified by:

ahead in interface MorphiumIterator<T>

Parameters:

jump - number of elements to jump

back

public void back(int jump)

Description copied from interface: MorphiumIterator

get back some positions

Specified by:

back in interface MorphiumIterator<T>

Parameters:

jump - number of elements to jump back

available

public int available()

Description copied from interface: MorphiumIterator

retruns the number of elements now in buffer. Max windowsize

Specified by:

available in interface MorphiumIterator<T>

Returns:

list

iterator

public Iterator<R> iterator()

Specified by:

iterator in interface Iterable<T>

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

nextMap

public Map<String,Object> nextMap()

Specified by:

nextMap in interface MorphiumIterator<T>

next

public R next()

Specified by:

next in interface Iterator<T>

getCurrentBuffer

public List<R> getCurrentBuffer()

Description copied from interface: MorphiumIterator

get the current buffer. Maximum length is specified windowsize

Specified by:

getCurrentBuffer in interface MorphiumIterator<T>

Returns:

list

close

public void close()

Specified by:

close in interface MorphiumIterator<T>

getCursor

public int getCursor()

Description copied from interface: MorphiumIterator

returns current cursor position

Specified by:

getCursor in interface MorphiumIterator<T>

Returns:

int

getAggregator

public Aggregator<T,R> getAggregator()

Specified by:

getAggregator in interface MorphiumAggregationIterator<T,R>

setAggregator

public void setAggregator(Aggregator<T,R> aggregator)

Specified by:

setAggregator in interface MorphiumAggregationIterator<T,R>