public final class IntSpliterators
extends java.lang.Object
Spliterators
Modifier and Type | Class and Description |
---|---|
static class |
IntSpliterators.AbstractIndexBasedSpliterator
A skeletal implementation for a spliterator backed by an index based data store.
|
static class |
IntSpliterators.EarlyBindingSizeIndexBasedSpliterator
A skeletal implementation for a spliterator backed by an index based data store.
|
static class |
IntSpliterators.EmptySpliterator
A class returning no elements and a type-specific spliterator interface.
|
static class |
IntSpliterators.LateBindingSizeIndexBasedSpliterator
A skeletal implementation for a spliterator backed by an index based data store.
|
Modifier and Type | Field and Description |
---|---|
static int |
COLLECTION_SPLITERATOR_CHARACTERISTICS |
static IntSpliterators.EmptySpliterator |
EMPTY_SPLITERATOR
An empty spliterator.
|
static int |
LIST_SPLITERATOR_CHARACTERISTICS |
static int |
SET_SPLITERATOR_CHARACTERISTICS |
static int |
SORTED_SET_SPLITERATOR_CHARACTERISTICS |
Modifier and Type | Method and Description |
---|---|
static IntSpliterator |
asIntSpliterator(java.util.Spliterator i)
Wraps a standard spliterator into a type-specific spliterator.
|
static IntSpliterator |
asIntSpliterator(java.util.Spliterator i,
IntComparator comparatorOverride)
Wraps a standard spliterator into a type-specific spliterator.
|
static IntIterator |
asIterator(IntSpliterator spliterator)
Wrap a type-specific
Spliterator as a type-specific Iterator |
static IntSpliterator |
asSpliterator(IntIterator iter,
long size,
int additionalCharacterisitcs)
Wrap a type-specific
Iterator of a known size as a type-specific Spliterator
The returned spliterator will report
characteristics additionalCharacterisitcs ,
and for primitive types, Spliterator.NONNULL . |
static IntSpliterator |
asSpliteratorFromSorted(IntIterator iter,
long size,
int additionalCharacterisitcs,
IntComparator comparator)
Wrap a type-specific, sorted
Iterator of a known size as a type-specific Spliterator
It is the caller's responsibility to ensure the iterator's order
is actually sorted according to the comparator given. |
static IntSpliterator |
asSpliteratorFromSortedUnknownSize(IntIterator iter,
int additionalCharacterisitcs,
IntComparator comparator)
Wrap a type-specific, sorted
Iterator of an unknown size as a type-specific Spliterator
It is the caller's responsibility to ensure the iterator's order
is actually sorted according to the comparator given. |
static IntSpliterator |
asSpliteratorUnknownSize(IntIterator iter,
int characterisitcs)
Wrap a type-specific
Iterator of an unknown size as a type-specific Spliterator
The returned spliterator will report additionalCharacterisitcs ,
and for primitive types, Spliterator.NONNULL . |
static IntSpliterator |
concat(IntSpliterator... a)
Concatenates all spliterators contained in an array.
|
static IntSpliterator |
concat(IntSpliterator[] a,
int offset,
int length)
Concatenates a sequence of spliterators contained in an array.
|
static IntSpliterator |
fromTo(int from,
int to)
Creates a type-specific spliterator over an interval.
|
static void |
onEachMatching(IntSpliterator spliterator,
java.util.function.IntPredicate predicate,
java.util.function.IntConsumer action)
Perform the given
action on each element that matches the given predicate . |
static IntSpliterator |
singleton(int element)
Returns a spliterator that iterates just over the given element.
|
static IntSpliterator |
singleton(int element,
IntComparator comparator)
Returns a spliterator that iterates just over the given element.
|
static IntSpliterator |
wrap(ByteSpliterator spliterator)
Returns a spliterator backed by the specified byte spliterator.
|
static IntSpliterator |
wrap(CharSpliterator spliterator)
Returns a spliterator backed by the specified char spliterator.
|
static IntSpliterator |
wrap(int[] array)
Wraps the given array into a type-specific spliterator.
|
static IntSpliterator |
wrap(int[] array,
int offset,
int length)
Wraps the given part of an array into a type-specific spliterator.
|
static IntSpliterator |
wrap(int[] array,
int offset,
int length,
int additionalCharacteristics)
Wraps the given part of an array into a type-specific spliterator.
|
static IntSpliterator |
wrap(ShortSpliterator spliterator)
Returns a spliterator backed by the specified short spliterator.
|
static IntSpliterator |
wrapPreSorted(int[] array,
IntComparator comparator)
Wraps the given sorted array into a type-specific spliterator.
|
static IntSpliterator |
wrapPreSorted(int[] array,
int offset,
int length,
IntComparator comparator)
Wraps the given part of a sorted array into a type-specific spliterator.
|
static IntSpliterator |
wrapPreSorted(int[] array,
int offset,
int length,
int additionalCharacteristics,
IntComparator comparator)
Wraps the given part of a sorted array into a type-specific spliterator.
|
public static final int COLLECTION_SPLITERATOR_CHARACTERISTICS
public static final int LIST_SPLITERATOR_CHARACTERISTICS
public static final int SET_SPLITERATOR_CHARACTERISTICS
public static final int SORTED_SET_SPLITERATOR_CHARACTERISTICS
public static final IntSpliterators.EmptySpliterator EMPTY_SPLITERATOR
The class of this objects represent an abstract empty spliterator that can iterate as a type-specific spliterator.
public static IntSpliterator singleton(int element)
element
- the only element to be returned by a type-specific spliterator.element
.public static IntSpliterator singleton(int element, IntComparator comparator)
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.
element
- the only element to be returned by a type-specific spliterator.comparator
- the comparator to return when Spliterator.getComparator()
is called.element
.public static IntSpliterator wrap(int[] array, int offset, int length)
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 index offset
.
The returned spliterator will report characteristics
Spliterator.SIZED
, Spliterator.SUBSIZED
,
Spliterator.ORDERED
, and for primitive arrays, Spliterator.NONNULL
.
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.length
elements of array
starting at position offset
.public static IntSpliterator wrap(int[] array)
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
.
array
- an array to wrap into a type-specific spliterator.array
.public static IntSpliterator wrap(int[] array, int offset, int length, int additionalCharacteristics)
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 index offset
.
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 in additionalCharacteristics
(for example, if
the caller knows the backing array has distinct elements, they can pass Spliterator.DISTINCT
).
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.length
elements of array
starting at position offset
.public static IntSpliterator wrapPreSorted(int[] array, int offset, int length, int additionalCharacteristics, IntComparator comparator)
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 index offset
.
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 in additionalCharacteristics
(for example, if
the caller knows the backing array has distinct elements, they can pass Spliterator.DISTINCT
).
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 (or null
for natural ordering)length
elements of array
starting at position offset
.public static IntSpliterator wrapPreSorted(int[] array, int offset, int length, IntComparator comparator)
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 index offset
.
The returned spliterator will report characteristics
Spliterator.SIZED
, Spliterator.SUBSIZED
,
Spliterator.ORDERED
, Spliterator.SORTED
, and for primitive arrays,
Spliterator.NONNULL
.
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 (or null
for natural ordering)length
elements of array
starting at position offset
.public static IntSpliterator wrapPreSorted(int[] array, IntComparator comparator)
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
.
array
- an array to wrap into a type-specific spliterator.comparator
- the comparator the array was sorted with (or null
for natural ordering)length
elements of array
starting at position offset
.public static IntSpliterator asIntSpliterator(java.util.Spliterator i)
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 by i
: 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.
i
- a spliterator.i
.public static IntSpliterator asIntSpliterator(java.util.Spliterator i, IntComparator comparatorOverride)
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 by i
: changes to one of the spliterators
will affect the other, too.
This method will cause the returned spliterator's Spliterator.getComparator()
method
to always return comparatorOverride
, regardless of what the wrapped spliterator's
getComparator()
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 a getComparator()
that returns a properly typed comparator.
i
- a spliterator.comparatorOverride
- the comparator to return when Spliterator.getComparator()
i
.public static void onEachMatching(IntSpliterator spliterator, java.util.function.IntPredicate predicate, java.util.function.IntConsumer action)
action
on each element that matches the given predicate
.
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).
public static IntSpliterator fromTo(int from, int to)
The type-specific spliterator returned by this method will return the
elements from
, from+1
,…, to-1
.
from
- the starting element (inclusive).to
- the ending element (exclusive).from
to to
.public static IntSpliterator concat(IntSpliterator... a)
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's Spliterator.getComparator()
will always throw IllegalStateException
, even when if the current or even all
the inner spliterators are sorted.
a
- an array of spliterators.public static IntSpliterator concat(IntSpliterator[] a, int offset, int length)
This method returns a spliterator that will enumerate in order the elements returned
by a[offset]
, then those returned
by a[offset + 1]
, and so on up to
a[offset + length - 1]
.
Note: Due to there being no way to ensure the Comparator
is consistent
between each inner spliterator, the returned spliterator's Spliterator.getComparator()
will always throw IllegalStateException
, even when if the current or even all
the inner spliterators are sorted.
a
- an array of spliterators.offset
- the index of the first spliterator to concatenate.length
- the number of spliterators to concatenate.length
elements of a
starting at offset
.public static IntSpliterator asSpliterator(IntIterator iter, long size, int additionalCharacterisitcs)
Iterator
of a known size as a type-specific Spliterator
The returned spliterator will report
characteristics
additionalCharacterisitcs
,
and for primitive types, Spliterator.NONNULL
.
It will also report Spliterator.SIZED
, Spliterator.SUBSIZED
,
unless Spliterator.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's
Spliterator.trySplit()
will have linear runtime.
iter
- the type-specific Iterator
to wrapsize
- the number of elements the iterator will returnadditionalCharacterisitcs
- any additional characteristics to reportSpliterator
that will give the same elements the iterator will return.Spliterators.spliterator(java.util.Iterator, long, int)
public static IntSpliterator asSpliteratorFromSorted(IntIterator iter, long size, int additionalCharacterisitcs, IntComparator comparator)
Iterator
of a known size as a type-specific Spliterator
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 report Spliterator.SIZED
, Spliterator.SUBSIZED
,
unless Spliterator.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's
Spliterator.trySplit()
will have linear runtime.
iter
- the type-specific Iterator
to wrapsize
- the number of elements the iterator will returnadditionalCharacterisitcs
- any additional characteristics to reportcomparator
- the comparator the iterator is ordered on (or null
for natural ordering)Spliterator
that will give the same elements the iterator will return.public static IntSpliterator asSpliteratorUnknownSize(IntIterator iter, int characterisitcs)
Iterator
of an unknown size as a type-specific Spliterator
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's
Spliterator.trySplit()
will have linear runtime.
iter
- the type-specific Iterator
to wrapcharacterisitcs
- the characteristics to reportSpliterator
that will give the same elements the iterator will return.Spliterators.spliteratorUnknownSize(java.util.Iterator, int)
public static IntSpliterator asSpliteratorFromSortedUnknownSize(IntIterator iter, int additionalCharacterisitcs, IntComparator comparator)
Iterator
of an unknown size as a type-specific Spliterator
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's
Spliterator.trySplit()
will have linear runtime.
iter
- the type-specific Iterator
to wrapadditionalCharacterisitcs
- the characteristics to reportcomparator
- the comparator the iterator is ordered on (or null
for natural ordering)Spliterator
that will give the same elements the iterator will return.public static IntIterator asIterator(IntSpliterator spliterator)
Spliterator
as a type-specific Iterator
spliterator
- the type-specific Spliterator
to wrapIterator
that will return the same elements the spliterator will give.Spliterators.iterator(java.util.Spliterator)
public static IntSpliterator wrap(ByteSpliterator spliterator)
Note: Due to the incompatibility of primitive Comparator
types,
the returned spliterator's Spliterator.getComparator()
will always
throw IllegalStateException
, even when the underlying spliterator is
sorted.
spliterator
- a byte spliterator.public static IntSpliterator wrap(ShortSpliterator spliterator)
Note: Due to the incompatibility of primitive Comparator
types,
the returned spliterator's Spliterator.getComparator()
will always
throw IllegalStateException
, even when the underlying spliterator is
sorted.
spliterator
- a short spliterator.public static IntSpliterator wrap(CharSpliterator 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's Spliterator.getComparator()
will always
throw IllegalStateException
, even when the underlying spliterator is
sorted.
spliterator
- a char spliterator.