Package nl.vpro.util

Class MaxOffsetIterator<T>

java.lang.Object

nl.vpro.util.MaxOffsetIterator<T>

All Implemented Interfaces:

com.google.common.collect.PeekingIterator<T>, AutoCloseable, Iterator<T>, CloseableIterator<T>, CloseablePeekingIterator<T>

Direct Known Subclasses:

CountedMaxOffsetIterator

public class MaxOffsetIterator<T>
extends Object
implements CloseablePeekingIterator<T>

An iterator implementing offset and max, for another iterator.

Since:

3.1

Author:

Michiel Meeuwissen

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MaxOffsetIterator.Builder<T>

Nested classes/interfaces inherited from interface nl.vpro.util.CloseableIterator

CloseableIterator.WrappedCloseableIterator<S>, CloseableIterator.WrappedPeekingCloseableIterator<S>

Field Summary

Fields

Modifier and Type	Field	Description
protected long	count	The count of the next element.
protected Boolean	hasNext
protected T	next
protected final long	offsetmax	The maximal value of count.
protected com.google.common.collect.PeekingIterator<T>	peekingWrapped
protected final CloseableIterator<T>	wrapped

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MaxOffsetIterator(@NonNull Iterator<T> wrapped, @Nullable Number max, @Nullable Number offset, @Nullable Predicate<T> countPredicate, boolean countNulls, @Nullable List<Runnable> callbacks, boolean autoClose)
	MaxOffsetIterator(Iterator<T> wrapped, Number max)
	MaxOffsetIterator(Iterator<T> wrapped, Number max, boolean countNulls)
	MaxOffsetIterator(Iterator<T> wrapped, Number max, Number offset)
	MaxOffsetIterator(Iterator<T> wrapped, Number max, Number offset, boolean countNulls)

Method Summary

Modifier and Type	Method	Description
MaxOffsetIterator<T>	autoClose()
MaxOffsetIterator<T>	autoClose(AutoCloseable... closeables)
static <T> MaxOffsetIterator.Builder<T>	builder()
MaxOffsetIterator<T>	callBack(Runnable run)
void	close()
static <T> CountedMaxOffsetIterator.Builder<T>	countedBuilder()
protected static <S> Predicate<S>	effectiveCountPredicate(Predicate<S> countPredicate, boolean countNulls)
protected boolean	findNext()
long	getOffset()
boolean	hasNext()
T	next()
T	peek()
com.google.common.collect.PeekingIterator<T>	peekingWrapped()	Access to the (peeking) wrapped iterator.
void	remove()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface nl.vpro.util.CloseableIterator

peeking, stream

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Details

wrapped

protected final CloseableIterator<T> wrapped

peekingWrapped

protected com.google.common.collect.PeekingIterator<T> peekingWrapped

offsetmax

protected final long offsetmax

The maximal value of count. I.e. offset + max;

count

protected long count

The count of the next element. First value will be the supplied value of offset.

hasNext

protected Boolean hasNext

next

protected T next

Constructor Details

MaxOffsetIterator

public MaxOffsetIterator(Iterator<T> wrapped,
 Number max,
 boolean countNulls)

MaxOffsetIterator

public MaxOffsetIterator(Iterator<T> wrapped,
 Number max)

MaxOffsetIterator

public MaxOffsetIterator(Iterator<T> wrapped,
 Number max,
 Number offset)

MaxOffsetIterator

public MaxOffsetIterator(Iterator<T> wrapped,
 Number max,
 Number offset,
 boolean countNulls)

MaxOffsetIterator

protected MaxOffsetIterator(@NonNull Iterator<T> wrapped,
 @Nullable Number max,
 @Nullable Number offset,
 @Nullable Predicate<T> countPredicate,
 boolean countNulls,
 @Nullable List<Runnable> callbacks,
 boolean autoClose)

Method Details

effectiveCountPredicate

protected static <S> Predicate<S> effectiveCountPredicate(Predicate<S> countPredicate,
 boolean countNulls)

callBack

public MaxOffsetIterator<T> callBack(Runnable run)

autoClose

public MaxOffsetIterator<T> autoClose(AutoCloseable... closeables)

autoClose

public MaxOffsetIterator<T> autoClose()

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

peek

public T peek()

Specified by:

peek in interface com.google.common.collect.PeekingIterator<T>

next

public T next()

Specified by:

next in interface Iterator<T>

Specified by:

next in interface com.google.common.collect.PeekingIterator<T>

findNext

protected boolean findNext()

remove

public void remove()

Specified by:

remove in interface Iterator<T>

Specified by:

remove in interface com.google.common.collect.PeekingIterator<T>

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception

toString

public String toString()

Overrides:

toString in class Object

peekingWrapped

public com.google.common.collect.PeekingIterator<T> peekingWrapped()

Access to the (peeking) wrapped iterator. This may be used to look 'beyond' max, to check what would have been the next one.

countedBuilder

public static <T>
CountedMaxOffsetIterator.Builder<T> countedBuilder()

builder

public static <T> MaxOffsetIterator.Builder<T> builder()

getOffset

public long getOffset()