Class ReferenceBigArrayBigList<K>
- All Implemented Interfaces:
BigList<K>
,ObjectIterable<K>
,ReferenceBigList<K>
,ReferenceCollection<K>
,Size64
,Stack<K>
,Serializable
,Cloneable
,Iterable<K>
,Collection<K>
,RandomAccess
This class implements a lightweight, fast, open, optimized, reuse-oriented version of
big-array-based big lists. Instances of this class represent a big list with a big array that is
enlarged as needed when new entries are created (by increasing its current length to 50%), but is
never made smaller (even on a clear()
). A family of trimming methods lets you control the size of the backing big array; this is particularly useful
if you reuse instances of this class. Range checks are equivalent to those of java.util
's
classes, but they are delayed as much as possible.
The backing big array is exposed by the elements()
method. If an instance of this class
was created by wrapping, backing-array reallocations will be
performed using reflection, so that elements()
can return a big array of the same type
of the original big array; the comments about efficiency made in
ObjectArrays
apply here.
This class implements the bulk methods removeElements()
, addElements()
and
getElements()
using high-performance system calls (e.g.,
System.arraycopy()
) instead of expensive
loops.
- See Also:
-
Nested Class Summary
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceBigList
AbstractReferenceBigList.ReferenceRandomAccessSubList<K>, AbstractReferenceBigList.ReferenceSubList<K>
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
The initial default capacity of a big-array big list. -
Constructor Summary
ConstructorDescriptionCreates a new big-array big list withDEFAULT_INITIAL_CAPACITY
capacity.ReferenceBigArrayBigList
(long capacity) Creates a new big-array big list with given capacity.ReferenceBigArrayBigList
(ObjectIterator<? extends K> i) Creates a new big-array big list and fills it with the elements returned by a type-specific iterator..ReferenceBigArrayBigList
(ReferenceBigList<? extends K> l) Creates a new big-array big list and fills it with a given type-specific list.ReferenceBigArrayBigList
(ReferenceCollection<? extends K> c) Creates a new big-array big list and fills it with a given type-specific collection.ReferenceBigArrayBigList
(Collection<? extends K> c) Creates a new big-array big list and fills it with a given collection.ReferenceBigArrayBigList
(Iterator<? extends K> i) Creates a new big-array big list and fills it with the elements returned by an iterator..ReferenceBigArrayBigList
(K[][] a) Creates a new big-array big list and fills it with the elements of a given big array.ReferenceBigArrayBigList
(K[][] a, long offset, long length) Creates a new big-array big list and fills it with the elements of a given big array. -
Method Summary
Modifier and TypeMethodDescriptionvoid
Inserts the specified element at the specified position in this big list (optional operation).boolean
boolean
addAll
(long index, ReferenceBigList<? extends K> list) Inserts all of the elements in the specified type-specific big list into this type-specific big list at the specified position (optional operation).boolean
addAll
(long index, ReferenceList<? extends K> list) Inserts all of the elements in the specified type-specific list into this type-specific big list at the specified position (optional operation).boolean
addAll
(long index, Collection<? extends K> c) Adds all of the elements in the specified collection to this list (optional operation).void
addElements
(long index, K[][] a, long offset, long length) Adds elements to this type-specific list using optimized system calls.void
clear()
clone()
K[][]
elements()
Returns the backing big array of this big list.void
ensureCapacity
(long capacity) Ensures that this big-array big list can contain the given number of entries without resizing.boolean
Compares this type-specific big-array list to another one.boolean
void
get
(long index) Returns the element at the specified position.void
getElements
(long from, Object[][] a, long offset, long length) Copies element of this type-specific list into the given big array using optimized system calls.void
getElements
(long from, Object[] a, int offset, int length) Copies element of this type-specific list into the given array using optimized system calls.long
Returns the index of the first occurrence of the specified element in this big list, or -1 if this big list does not contain the element.boolean
isEmpty()
Checks whether the stack is empty.long
Returns the index of the last occurrence of the specified element in this big list, or -1 if this big list does not contain the element.listIterator
(long index) Returns a type-specific list iterator on this type-specific big list starting at a given index.static <K> ReferenceBigArrayBigList
<K> of()
Creates a new empty big array list.static <K> ReferenceBigArrayBigList
<K> of
(K... init) Creates a big array list using a list of elements.remove
(long index) Removes the element at the specified position.boolean
boolean
removeAll
(Collection<?> c) void
removeElements
(long from, long to) Removes elements of this type-specific list using optimized system calls.Replaces the element at the specified position in this big list with the specified element (optional operation).void
setElements
(long index, Object[][] a, long offset, long length) Copies elements in the given big array into this type-specific list using optimized system calls.void
size
(long size) Sets the size of this big list.long
size64()
Returns the size of this data structure as a long.Returns a type-specific spliterator on the elements of this big-list.subList
(long from, long to) Returns a type-specific view of the portion of this type-specific big list from the indexfrom
, inclusive, to the indexto
, exclusive.static <K> Collector
<K, ?, ReferenceBigArrayBigList<K>> Returns aCollector
that collects aStream
's elements into a new ArrayList.static <K> Collector
<K, ?, ReferenceBigArrayBigList<K>> toBigListWithExpectedSize
(long expectedSize) Returns aCollector
that collects aStream
's elements into a new ArrayList.void
trim()
Trims this big-array big list so that the capacity is equal to the size.void
trim
(long n) Trims the backing big array if it is too large.static <K> ReferenceBigArrayBigList
<K> wrap
(K[][] a) Wraps a given big array into a big-array big list.static <K> ReferenceBigArrayBigList
<K> wrap
(K[][] a, long length) Wraps a given big array into a big-array list of given size.Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceBigList
addAll, addElements, contains, hashCode, iterator, listIterator, peek, pop, push, size, top, toString
Methods inherited from class java.util.AbstractCollection
containsAll, retainAll, toArray, toArray
Methods inherited from interface java.util.Collection
containsAll, parallelStream, removeIf, retainAll, stream, toArray, toArray, toArray
Methods inherited from interface it.unimi.dsi.fastutil.objects.ReferenceBigList
addAll, addAll, setElements, setElements
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Field Details
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DEFAULT_INITIAL_CAPACITY
public static final int DEFAULT_INITIAL_CAPACITYThe initial default capacity of a big-array big list.- See Also:
-
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Constructor Details
-
ReferenceBigArrayBigList
public ReferenceBigArrayBigList(long capacity) Creates a new big-array big list with given capacity.- Parameters:
capacity
- the initial capacity of the array list (may be 0).
-
ReferenceBigArrayBigList
public ReferenceBigArrayBigList()Creates a new big-array big list withDEFAULT_INITIAL_CAPACITY
capacity. -
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with a given type-specific collection.- Parameters:
c
- a type-specific collection that will be used to fill the array list.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with a given collection.- Parameters:
c
- a collection that will be used to fill the array list.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with a given type-specific list.- Parameters:
l
- a type-specific list that will be used to fill the array list.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with the elements of a given big array.- Parameters:
a
- a big array whose elements will be used to fill the array list.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with the elements of a given big array.- Parameters:
a
- a big array whose elements will be used to fill the array list.offset
- the first element to use.length
- the number of elements to use.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with the elements returned by an iterator..- Parameters:
i
- an iterator whose returned elements will fill the array list.
-
ReferenceBigArrayBigList
Creates a new big-array big list and fills it with the elements returned by a type-specific iterator..- Parameters:
i
- a type-specific iterator whose returned elements will fill the array list.
-
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Method Details
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elements
Returns the backing big array of this big list.If this big-array big list was created by wrapping a given big array, it is guaranteed that the type of the returned big array will be the same. Otherwise, the returned big array will be an big array of objects.
- Returns:
- the backing big array.
-
wrap
Wraps a given big array into a big-array list of given size.- Parameters:
a
- a big array to wrap.length
- the length of the resulting big-array list.- Returns:
- a new big-array list of the given size, wrapping the given big array.
-
wrap
Wraps a given big array into a big-array big list.- Parameters:
a
- a big array to wrap.- Returns:
- a new big-array big list wrapping the given array.
-
of
Creates a new empty big array list.- Returns:
- a new empty big-array big list.
-
of
Creates a big array list using a list of elements.- Parameters:
init
- a list of elements that will be used to initialize the big list. It is possible (but not assured) that the returned big-array big list will be backed by the given array in one of its segments.- Returns:
- a new big-array big list containing the given elements.
- See Also:
-
toBigList
Returns aCollector
that collects aStream
's elements into a new ArrayList. -
toBigListWithExpectedSize
public static <K> Collector<K,?, toBigListWithExpectedSizeReferenceBigArrayBigList<K>> (long expectedSize) Returns aCollector
that collects aStream
's elements into a new ArrayList.- Implementation Notes:
- The current implementation preallocates the full size for every worker thread when used on parallel streams. This can be quite wasteful, as worker threads other then the first don't usually handle the contents of the full stream.
-
ensureCapacity
public void ensureCapacity(long capacity) Ensures that this big-array big list can contain the given number of entries without resizing.- Parameters:
capacity
- the new minimum capacity for this big-array big list.
-
add
Description copied from class:AbstractReferenceBigList
Inserts the specified element at the specified position in this big list (optional operation). -
add
Description copied from class:AbstractReferenceBigList
- Specified by:
add
in interfaceCollection<K>
- Overrides:
add
in classAbstractReferenceBigList<K>
-
get
Description copied from interface:BigList
Returns the element at the specified position. -
indexOf
Description copied from interface:BigList
Returns the index of the first occurrence of the specified element in this big list, or -1 if this big list does not contain the element. -
lastIndexOf
Description copied from interface:BigList
Returns the index of the last occurrence of the specified element in this big list, or -1 if this big list does not contain the element.- Specified by:
lastIndexOf
in interfaceBigList<K>
- Overrides:
lastIndexOf
in classAbstractReferenceBigList<K>
- Parameters:
k
- the object to search for.- Returns:
- the index of the last occurrence of the specified element in this big list, or -1 if this big list does not contain the element.
- See Also:
-
remove
Description copied from class:AbstractReferenceBigList
Removes the element at the specified position. -
remove
- Specified by:
remove
in interfaceCollection<K>
- Overrides:
remove
in classAbstractCollection<K>
-
set
Description copied from class:AbstractReferenceBigList
Replaces the element at the specified position in this big list with the specified element (optional operation). -
removeAll
- Specified by:
removeAll
in interfaceCollection<K>
- Overrides:
removeAll
in classAbstractCollection<K>
-
addAll
Description copied from class:AbstractReferenceBigList
Adds all of the elements in the specified collection to this list (optional operation).- Specified by:
addAll
in interfaceBigList<K>
- Overrides:
addAll
in classAbstractReferenceBigList<K>
- Parameters:
index
- index at which to insert the first element from the specified collection.c
- collection containing elements to be added to this big list.- Returns:
true
if this big list changed as a result of the call- See Also:
-
addAll
Description copied from interface:ReferenceBigList
Inserts all of the elements in the specified type-specific big list into this type-specific big list at the specified position (optional operation).- Specified by:
addAll
in interfaceReferenceBigList<K>
- See Also:
-
addAll
Description copied from interface:ReferenceBigList
Inserts all of the elements in the specified type-specific list into this type-specific big list at the specified position (optional operation).- Specified by:
addAll
in interfaceReferenceBigList<K>
- See Also:
-
clear
public void clear()Description copied from class:AbstractReferenceBigList
- Specified by:
clear
in interfaceCollection<K>
- Overrides:
clear
in classAbstractReferenceBigList<K>
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size64
public long size64()Description copied from interface:Size64
Returns the size of this data structure as a long. -
size
public void size(long size) Description copied from interface:BigList
Sets the size of this big list.If the specified size is smaller than the current size, the last elements are discarded. Otherwise, they are filled with 0/
null
/false
. -
isEmpty
public boolean isEmpty()Description copied from interface:Stack
Checks whether the stack is empty.- Specified by:
isEmpty
in interfaceCollection<K>
- Specified by:
isEmpty
in interfaceStack<K>
- Overrides:
isEmpty
in classAbstractCollection<K>
- Returns:
- true if the stack is empty.
-
trim
public void trim()Trims this big-array big list so that the capacity is equal to the size.- See Also:
-
trim
public void trim(long n) Trims the backing big array if it is too large. If the current big array length is smaller than or equal ton
, this method does nothing. Otherwise, it trims the big-array length to the maximum betweenn
andsize64()
.This method is useful when reusing big lists. Clearing a big list leaves the big-array length untouched. If you are reusing a big list many times, you can call this method with a typical size to avoid keeping around a very large big array just because of a few large transient big lists.
- Parameters:
n
- the threshold for the trimming.
-
subList
Description copied from interface:ReferenceBigList
Returns a type-specific view of the portion of this type-specific big list from the indexfrom
, inclusive, to the indexto
, exclusive.- Specified by:
subList
in interfaceBigList<K>
- Specified by:
subList
in interfaceReferenceBigList<K>
- Overrides:
subList
in classAbstractReferenceBigList<K>
- Parameters:
from
- the starting element (inclusive).to
- the ending element (exclusive).- Returns:
- a big sublist view of this big list.
- See Also:
-
getElements
Copies element of this type-specific list into the given big array using optimized system calls.- Specified by:
getElements
in interfaceReferenceBigList<K>
- Overrides:
getElements
in classAbstractReferenceBigList<K>
- Parameters:
from
- the start index (inclusive).a
- the destination big array.offset
- the offset into the destination array where to store the first element copied.length
- the number of elements to be copied.
-
getElements
Copies element of this type-specific list into the given array using optimized system calls.- Specified by:
getElements
in interfaceReferenceBigList<K>
- Parameters:
from
- the start index (inclusive).a
- the destination array.offset
- the offset into the destination array where to store the first element copied.length
- the number of elements to be copied.
-
removeElements
public void removeElements(long from, long to) Removes elements of this type-specific list using optimized system calls.- Specified by:
removeElements
in interfaceReferenceBigList<K>
- Overrides:
removeElements
in classAbstractReferenceBigList<K>
- Parameters:
from
- the start index (inclusive).to
- the end index (exclusive).
-
addElements
Adds elements to this type-specific list using optimized system calls.- Specified by:
addElements
in interfaceReferenceBigList<K>
- Overrides:
addElements
in classAbstractReferenceBigList<K>
- Parameters:
index
- the index at which to add elements.a
- the big array containing the elements.offset
- the offset of the first element to add.length
- the number of elements to add.
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setElements
Copies elements in the given big array into this type-specific list using optimized system calls.- Specified by:
setElements
in interfaceReferenceBigList<K>
- Overrides:
setElements
in classAbstractReferenceBigList<K>
- Parameters:
index
- the start index (inclusive).a
- the destination big array.offset
- the offset into the destination array where to store the first element copied.length
- the number of elements to be copied.
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forEach
Description copied from class:AbstractReferenceBigList
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listIterator
Description copied from class:AbstractReferenceBigList
Returns a type-specific list iterator on this type-specific big list starting at a given index.- Specified by:
listIterator
in interfaceBigList<K>
- Specified by:
listIterator
in interfaceReferenceBigList<K>
- Overrides:
listIterator
in classAbstractReferenceBigList<K>
- Parameters:
index
- index of first element to be returned from the big-list iterator.- Returns:
- a big-list iterator of the elements in this big list, starting at the specified position in this big list.
- See Also:
-
spliterator
Description copied from interface:ReferenceBigList
Returns a type-specific spliterator on the elements of this big-list.BigList spliterators must report at least
Spliterator.SIZED
andSpliterator.ORDERED
.See
List.spliterator()
for more documentation on the requirements of the returned spliterator (despiteBigList
not being aList
, most of the same requirements apply.- Specified by:
spliterator
in interfaceCollection<K>
- Specified by:
spliterator
in interfaceIterable<K>
- Specified by:
spliterator
in interfaceObjectIterable<K>
- Specified by:
spliterator
in interfaceReferenceBigList<K>
- Specified by:
spliterator
in interfaceReferenceCollection<K>
- Returns:
- a type-specific spliterator on the elements of this collection.
-
clone
-
equals
Compares this type-specific big-array list to another one.This method exists only for sake of efficiency. The implementation inherited from the abstract implementation would already work.
- Parameters:
l
- a type-specific big-array list.- Returns:
- true if the argument contains the same elements of this type-specific big-array list.
-
equals
- Specified by:
equals
in interfaceCollection<K>
- Overrides:
equals
in classAbstractReferenceBigList<K>
-