Class LongSpliterators
- Since:
- 8.5.0
- Author:
- C. Sean Young <csyoung@google.com>
- See Also:
-
Nested Class Summary
Modifier and TypeClassDescriptionstatic class
A skeletal implementation for a spliterator backed by an index based data store.static class
A skeletal implementation for a spliterator backed by an index based data store.static class
A class returning no elements and a type-specific spliterator interface.static class
A skeletal implementation for a spliterator backed by an index based data store. -
Field Summary
Modifier and TypeFieldDescriptionstatic final int
static final LongSpliterators.EmptySpliterator
An empty spliterator.static final int
static final int
static final int
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Method Summary
Modifier and TypeMethodDescriptionstatic LongIterator
asIterator
(LongSpliterator spliterator) Wrap a type-specificSpliterator
as a type-specificIterator
static LongSpliterator
Wraps a standard spliterator into a type-specific spliterator.static LongSpliterator
asLongSpliterator
(Spliterator i, LongComparator comparatorOverride) Wraps a standard spliterator into a type-specific spliterator.static LongSpliterator
asSpliterator
(LongIterator iter, long size, int additionalCharacterisitcs) Wrap a type-specificIterator
of a known size as a type-specificSpliterator
static LongSpliterator
asSpliteratorFromSorted
(LongIterator iter, long size, int additionalCharacterisitcs, LongComparator comparator) Wrap a type-specific, sortedIterator
of a known size as a type-specificSpliterator
static LongSpliterator
asSpliteratorFromSortedUnknownSize
(LongIterator iter, int additionalCharacterisitcs, LongComparator comparator) Wrap a type-specific, sortedIterator
of an unknown size as a type-specificSpliterator
static LongSpliterator
asSpliteratorUnknownSize
(LongIterator iter, int characterisitcs) Wrap a type-specificIterator
of an unknown size as a type-specificSpliterator
static LongSpliterator
concat
(LongSpliterator... a) Concatenates all spliterators contained in an array.static LongSpliterator
concat
(LongSpliterator[] a, int offset, int length) Concatenates a sequence of spliterators contained in an array.static LongSpliterator
fromTo
(long from, long to) Creates a type-specific spliterator over an interval.static void
onEachMatching
(LongSpliterator spliterator, LongPredicate predicate, LongConsumer action) Perform the givenaction
on each element that matches the givenpredicate
.static LongSpliterator
singleton
(long element) Returns a spliterator that iterates just over the given element.static LongSpliterator
singleton
(long element, LongComparator comparator) Returns a spliterator that iterates just over the given element.static LongSpliterator
wrap
(long[] array) Wraps the given array into a type-specific spliterator.static LongSpliterator
wrap
(long[] array, int offset, int length) Wraps the given part of an array into a type-specific spliterator.static LongSpliterator
wrap
(long[] array, int offset, int length, int additionalCharacteristics) Wraps the given part of an array into a type-specific spliterator.static LongSpliterator
wrap
(ByteSpliterator spliterator) Returns a spliterator backed by the specified byte spliterator.static LongSpliterator
wrap
(CharSpliterator spliterator) Returns a spliterator backed by the specified char spliterator.static LongSpliterator
wrap
(IntSpliterator spliterator) Returns a spliterator backed by the specified integer spliterator.static LongSpliterator
wrap
(ShortSpliterator spliterator) Returns a spliterator backed by the specified short spliterator.static LongSpliterator
wrapPreSorted
(long[] array, int offset, int length, int additionalCharacteristics, LongComparator comparator) Wraps the given part of a sorted array into a type-specific spliterator.static LongSpliterator
wrapPreSorted
(long[] array, int offset, int length, LongComparator comparator) Wraps the given part of a sorted array into a type-specific spliterator.static LongSpliterator
wrapPreSorted
(long[] array, LongComparator comparator) Wraps the given sorted array into a type-specific spliterator.
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Field Details
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COLLECTION_SPLITERATOR_CHARACTERISTICS
public static final int COLLECTION_SPLITERATOR_CHARACTERISTICS- See Also:
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LIST_SPLITERATOR_CHARACTERISTICS
public static final int LIST_SPLITERATOR_CHARACTERISTICS- See Also:
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SET_SPLITERATOR_CHARACTERISTICS
public static final int SET_SPLITERATOR_CHARACTERISTICS- See Also:
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SORTED_SET_SPLITERATOR_CHARACTERISTICS
public static final int SORTED_SET_SPLITERATOR_CHARACTERISTICS- See Also:
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EMPTY_SPLITERATOR
An empty spliterator. It is serializable and cloneable.The class of this objects represent an abstract empty spliterator that can iterate as a type-specific spliterator.
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-
Method Details
-
singleton
Returns a spliterator that iterates just over the given element.- Parameters:
element
- the only element to be returned by a type-specific spliterator.- Returns:
- a spliterator that iterates just over
element
.
-
singleton
Returns a spliterator that iterates just over the given element.The
Spliterator.getComparator()
method will return the given comparator. This is within spec because sequences of size 1 are trivially sorted for any comparison function.- Parameters:
element
- the only element to be returned by a type-specific spliterator.comparator
- the comparator to return whenSpliterator.getComparator()
is called.- Returns:
- a spliterator that iterates just over
element
.
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wrap
Wraps the given part of an array into a type-specific spliterator.The type-specific spliterator returned by this method will iterate
length
times, advancing over consecutive elements of the given array starting from the one with indexoffset
.The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
, and for primitive arrays,Spliterator.NONNULL
.- Parameters:
array
- an array to wrap into a type-specific spliterator.offset
- the first element of the array to be returned.length
- the number of elements to return.- Returns:
- a spliterator that will iterate over
length
elements ofarray
starting at positionoffset
.
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wrap
Wraps the given array into a type-specific spliterator.The type-specific spliterator returned by this method will advance over all elements of the given array.
The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
, and for primitive arrays,Spliterator.NONNULL
.- Parameters:
array
- an array to wrap into a type-specific spliterator.- Returns:
- a spliterator that will iterate over the elements of
array
.
-
wrap
public static LongSpliterator wrap(long[] array, int offset, int length, int additionalCharacteristics) Wraps the given part of an array into a type-specific spliterator.The type-specific spliterator returned by this method will iterate
length
times, advancing over consecutive elements of the given array starting from the one with indexoffset
.The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
, and for primitive arrays,Spliterator.NONNULL
, on top of any additional characteristics given inadditionalCharacteristics
(for example, if the caller knows the backing array has distinct elements, they can passSpliterator.DISTINCT
).- Parameters:
array
- an array to wrap into a type-specific spliterator.offset
- the first element of the array to be returned.length
- the number of elements to return.additionalCharacteristics
- any additional characteristics to report.- Returns:
- a spliterator that will iterate over
length
elements ofarray
starting at positionoffset
.
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wrapPreSorted
public static LongSpliterator wrapPreSorted(long[] array, int offset, int length, int additionalCharacteristics, LongComparator comparator) Wraps the given part of a sorted array into a type-specific spliterator.It is the caller's responsibility to ensure the array is actually sorted using the comparator given.
The type-specific spliterator returned by this method will iterate
length
times, advancing over consecutive elements of the given array starting from the one with indexoffset
.The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
,Spliterator.SORTED
, and for primitive arrays,Spliterator.NONNULL
, on top of any additional characteristics given inadditionalCharacteristics
(for example, if the caller knows the backing array has distinct elements, they can passSpliterator.DISTINCT
).- Parameters:
array
- an array to wrap into a type-specific spliterator.offset
- the first element of the array to be returned.length
- the number of elements to return.additionalCharacteristics
- any additional characteristics to report.comparator
- the comparator the array was sorted with (ornull
for natural ordering)- Returns:
- a spliterator that will iterate over
length
elements ofarray
starting at positionoffset
.
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wrapPreSorted
public static LongSpliterator wrapPreSorted(long[] array, int offset, int length, LongComparator comparator) Wraps the given part of a sorted array into a type-specific spliterator.It is the caller's responsibility to ensure the array is actually sorted using the comparator given.
The type-specific spliterator returned by this method will iterate
length
times, advancing over consecutive elements of the given array starting from the one with indexoffset
.The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
,Spliterator.SORTED
, and for primitive arrays,Spliterator.NONNULL
.- Parameters:
array
- an array to wrap into a type-specific spliterator.offset
- the first element of the array to be returned.length
- the number of elements to return.comparator
- the comparator the array was sorted with (ornull
for natural ordering)- Returns:
- a spliterator that will iterate over
length
elements ofarray
starting at positionoffset
.
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wrapPreSorted
Wraps the given sorted array into a type-specific spliterator.It is the caller's responsibility to ensure the array is actually sorted using the comparator given.
The type-specific spliterator returned by this method will advance over all elements of the given array.
The returned spliterator will report characteristics
Spliterator.SIZED
,Spliterator.SUBSIZED
,Spliterator.ORDERED
,Spliterator.SORTED
, and for primitive arrays,Spliterator.NONNULL
.- Parameters:
array
- an array to wrap into a type-specific spliterator.comparator
- the comparator the array was sorted with (ornull
for natural ordering)- Returns:
- a spliterator that will iterate over
length
elements ofarray
starting at positionoffset
.
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asLongSpliterator
Wraps a standard spliterator into a type-specific spliterator.This method wraps a standard spliterator into a type-specific one which will handle the type conversions for you. Of course, any attempt to wrap a spliterator returning the instances of the wrong class will generate a
ClassCastException
. The returned spliterator is backed byi
: changes to one of the spliterators will affect the other, too.If
i
is already type-specific, it will returned and no new object will be generated.- Parameters:
i
- a spliterator.- Returns:
- a type-specific spliterator backed by
i
.
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asLongSpliterator
Wraps a standard spliterator into a type-specific spliterator.This method wraps a standard spliterator into a type-specific one which will handle the type conversions for you. Of course, any attempt to wrap a spliterator returning the instances of the wrong class will generate a
ClassCastException
. The returned spliterator is backed byi
: changes to one of the spliterators will affect the other, too.This method will cause the returned spliterator's
Spliterator.getComparator()
method to always returncomparatorOverride
, regardless of what the wrapped spliterator'sgetComparator()
method returns.NOTE:This is mostly intended for supporting default implementations in interfaces that wrap JDK spliterators, and not a general purpose method.
If
i
is already type-specific, this method will throw, as such spliterators already have agetComparator()
that returns a properly typed comparator.- Parameters:
i
- a spliterator.comparatorOverride
- the comparator to return whenSpliterator.getComparator()
- Returns:
- a type-specific spliterator backed by
i
.
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onEachMatching
public static void onEachMatching(LongSpliterator spliterator, LongPredicate predicate, LongConsumer action) Perform the givenaction
on each element that matches the givenpredicate
.This is equivalent to
java.util.stream.StreamSupport.stream(spliterator).filter(predicate).forEach(action)
(substitute the proper primitive stream as needed), except it may perform better (but no potential for parallelism). -
fromTo
Creates a type-specific spliterator over an interval.The type-specific spliterator returned by this method will return the elements
from
,from+1
,…,to-1
.- Parameters:
from
- the starting element (inclusive).to
- the ending element (exclusive).- Returns:
- a type-specific spliterator enumerating the elements from
from
toto
.
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concat
Concatenates all spliterators contained in an array.This method returns a spliterator that will enumerate in order the elements returned by all spliterators contained in the given array.
Note: Due to there being no way to ensure the
Comparator
is consistent between each inner spliterator, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when if the current or even all the inner spliterators are sorted.- Parameters:
a
- an array of spliterators.- Returns:
- a spliterator obtained by concatenation.
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concat
Concatenates a sequence of spliterators contained in an array.This method returns a spliterator that will enumerate in order the elements returned by
a[offset]
, then those returned bya[offset + 1]
, and so on up toa[offset + length - 1]
.Note: Due to there being no way to ensure the
Comparator
is consistent between each inner spliterator, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when if the current or even all the inner spliterators are sorted.- Parameters:
a
- an array of spliterators.offset
- the index of the first spliterator to concatenate.length
- the number of spliterators to concatenate.- Returns:
- a spliterator obtained by concatenation of
length
elements ofa
starting atoffset
.
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asSpliterator
public static LongSpliterator asSpliterator(LongIterator iter, long size, int additionalCharacterisitcs) Wrap a type-specificIterator
of a known size as a type-specificSpliterator
The returned spliterator will report
characteristics
additionalCharacterisitcs
, and for primitive types,Spliterator.NONNULL
. It will also reportSpliterator.SIZED
,Spliterator.SUBSIZED
, unlessSpliterator.CONCURRENT
is to be reported, in which case these two are not implicitly reported.Because
Iterator
is an inherently linear API, the returned spliterator will yield limited performance gains when run in parallel contexts, as the returned spliterator'sSpliterator.trySplit()
will have linear runtime.- Parameters:
iter
- the type-specificIterator
to wrapsize
- the number of elements the iterator will returnadditionalCharacterisitcs
- any additional characteristics to report- Returns:
- a type-specific
Spliterator
that will give the same elements the iterator will return. - See Also:
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asSpliteratorFromSorted
public static LongSpliterator asSpliteratorFromSorted(LongIterator iter, long size, int additionalCharacterisitcs, LongComparator comparator) Wrap a type-specific, sortedIterator
of a known size as a type-specificSpliterator
It is the caller's responsibility to ensure the iterator's order is actually sorted according to the comparator given.
The returned spliterator will report
characteristics
additionalCharacterisitcs
,Spliterator.ORDERED
,Spliterator.SORTED
, and for primitive types,Spliterator.NONNULL
. It will also reportSpliterator.SIZED
,Spliterator.SUBSIZED
, unlessSpliterator.CONCURRENT
is to be reported, in which case these two are not implicitly reported.Because
Iterator
is an inherently linear API, the returned spliterator will yield limited performance gains when run in parallel contexts, as the returned spliterator'sSpliterator.trySplit()
will have linear runtime.- Parameters:
iter
- the type-specificIterator
to wrapsize
- the number of elements the iterator will returnadditionalCharacterisitcs
- any additional characteristics to reportcomparator
- the comparator the iterator is ordered on (ornull
for natural ordering)- Returns:
- a type-specific
Spliterator
that will give the same elements the iterator will return.
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asSpliteratorUnknownSize
Wrap a type-specificIterator
of an unknown size as a type-specificSpliterator
The returned spliterator will report
additionalCharacterisitcs
, and for primitive types,Spliterator.NONNULL
.Because
Iterator
is an inherently linear API, the returned spliterator will yield limited performance gains when run in parallel contexts, as the returned spliterator'sSpliterator.trySplit()
will have linear runtime.- Parameters:
iter
- the type-specificIterator
to wrapcharacterisitcs
- the characteristics to report- Returns:
- a type-specific
Spliterator
that will give the same elements the iterator will return. - See Also:
-
asSpliteratorFromSortedUnknownSize
public static LongSpliterator asSpliteratorFromSortedUnknownSize(LongIterator iter, int additionalCharacterisitcs, LongComparator comparator) Wrap a type-specific, sortedIterator
of an unknown size as a type-specificSpliterator
It is the caller's responsibility to ensure the iterator's order is actually sorted according to the comparator given.
The returned spliterator will report
characteristics
additionalCharacterisitcs
,Spliterator.ORDERED
,Spliterator.SORTED
, and for primitive types,Spliterator.NONNULL
.Because
Iterator
is an inherently linear API, the returned spliterator will yield limited performance gains when run in parallel contexts, as the returned spliterator'sSpliterator.trySplit()
will have linear runtime.- Parameters:
iter
- the type-specificIterator
to wrapadditionalCharacterisitcs
- the characteristics to reportcomparator
- the comparator the iterator is ordered on (ornull
for natural ordering)- Returns:
- a type-specific
Spliterator
that will give the same elements the iterator will return.
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asIterator
Wrap a type-specificSpliterator
as a type-specificIterator
- Parameters:
spliterator
- the type-specificSpliterator
to wrap- Returns:
- a type-specific
Iterator
that will return the same elements the spliterator will give. - See Also:
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wrap
Returns a spliterator backed by the specified byte spliterator.Note: Due to the incompatibility of primitive
Comparator
types, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when the underlying spliterator is sorted.- Parameters:
spliterator
- a byte spliterator.- Returns:
- a spliterator backed by the specified byte spliterator.
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wrap
Returns a spliterator backed by the specified short spliterator.Note: Due to the incompatibility of primitive
Comparator
types, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when the underlying spliterator is sorted.- Parameters:
spliterator
- a short spliterator.- Returns:
- a spliterator backed by the specified short spliterator.
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wrap
Returns a spliterator backed by the specified char spliterator.WARNING: This is not the same as converting the source to a sequence of code points. This returned instance literally performs
(int)(charValue)
casts. Surrogate pairs will be left as separate elements instead of combined into a single element with the code point it represents.Note: Due to the incompatibility of primitive
Comparator
types, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when the underlying spliterator is sorted.- Parameters:
spliterator
- a char spliterator.- Returns:
- a spliterator backed by the specified char spliterator.
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wrap
Returns a spliterator backed by the specified integer spliterator.Note: Due to the incompatibility of primitive
Comparator
types, the returned spliterator'sSpliterator.getComparator()
will always throwIllegalStateException
, even when the underlying spliterator is sorted.- Parameters:
spliterator
- an integer spliterator.- Returns:
- a spliterator backed by the specified integer spliterator.
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