|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectit.unimi.dsi.fastutil.longs.AbstractLongCollection
it.unimi.dsi.fastutil.longs.AbstractLongList
it.unimi.dsi.fastutil.longs.LongArrayList
A type-specific array-based list; provides some additional methods that use polymorphism to reduce type juggling.
This class implements a lightweight, fast, open, optimized,
reuse-oriented version of array-based lists. Instances of this class
represent a list with an array that is enlarged as needed when new entries
are created (by dividing the current length by the golden ratio), but is
never made smaller (even on a clear()
). A family of
trimming methods lets you control the size of the
backing 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 array is exposed by the
elements()
method.
This class implements the bulk methods removeElements()
,
addElements()
and getElements()
using
high-performance system calls (e.g., System.arraycopy()
instead of
expensive loops.
ArrayList
,
Serialized FormField Summary | |
static int |
DEFAULT_INITIAL_CAPACITY
The initial default capacity of an array list. |
static long |
serialVersionUID
|
Constructor Summary | |
LongArrayList()
Creates a new array list with DEFAULT_INITIAL_CAPACITY capacity. |
|
LongArrayList(Collection c)
Creates a new array list and fills it with a given collection. |
|
LongArrayList(int capacity)
Creates a new array list with given capacity. |
|
LongArrayList(Iterator i)
Creates a new array list and fills it with the elements returned by an iterator.. |
|
LongArrayList(long[] a)
Creates a new array list and fills it with the elements of a given array. |
|
LongArrayList(long[] a,
int offset,
int length)
Creates a new array list and fills it with the elements of a given array. |
|
LongArrayList(LongCollection c)
Creates a new array list and fills it with a given type-specific collection. |
|
LongArrayList(LongIterator i)
Creates a new array list and fills it with the elements returned by a type-specific iterator.. |
|
LongArrayList(LongList l)
Creates a new array list and fills it with a given type-specific list. |
Method Summary | |
void |
add(int index,
long k)
|
boolean |
add(long k)
|
boolean |
addAll(int index,
LongCollection c)
Delegates to a more generic method. |
boolean |
addAll(int index,
LongList l)
Delegates to a more generic method. |
boolean |
addAll(LongList l)
Delegates to a more generic method. |
void |
addElements(int index,
long[] a,
int offset,
int length)
Adds elements to this type-specific list using optimized system calls. |
void |
clear()
|
Object |
clone()
|
int |
compareTo(LongArrayList l)
|
long[] |
elements()
Returns the backing array of this list. |
void |
ensureCapacity(int capacity)
Ensures that this array list can contain the given number of entries without resizing. |
boolean |
equals(LongArrayList l)
Compares this type-specific array list to another one. |
void |
getElements(int from,
long[] a,
int offset,
int length)
Copies element of this type-specific list into the given array using optimized system calls. |
long |
getLong(int index)
|
int |
indexOf(long k)
|
boolean |
isEmpty()
Checks whether the stack is empty. |
int |
lastIndexOf(long k)
|
LongListIterator |
longListIterator(int index)
Returns a type-specific list iterator on the list starting at a given index. |
boolean |
rem(long k)
Note that this method should be called remove() , but the clash
with the similarly named index-based method in the List interface
forces us to use a distinguished name. |
void |
removeElements(int from,
int to)
Removes elements of this type-specific list using optimized system calls. |
long |
removeLong(int index)
|
long |
set(int index,
long k)
|
int |
size()
|
void |
size(int size)
Sets the size of this list. |
long[] |
toLongArray(long[] a)
Builds a primitive type array containing the items of this collection. |
void |
trim()
Trims this array list so that the capacity is equal to the size. |
void |
trim(int n)
Trims the backing array if it is too large. |
static LongArrayList |
wrap(long[] a)
Wraps a given array into an array list. |
static LongArrayList |
wrap(long[] a,
int length)
Wraps a given array into an array list of given size. |
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongList |
add, addAll, addAll, addAll, addElements, compareTo, contains, equals, get, hashCode, indexOf, lastIndexOf, listIterator, listIterator, longIterator, longListIterator, longSubList, peek, peekLong, pop, popLong, push, push, remove, set, subList, top, topLong, toString |
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection |
add, contains, containsAll, containsAll, iterator, rem, remove, removeAll, removeAll, retainAll, retainAll, toArray, toArray, toArray, toLongArray |
Methods inherited from class java.lang.Object |
getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.List |
add, contains, containsAll, iterator, remove, removeAll, retainAll, toArray, toArray |
Methods inherited from interface it.unimi.dsi.fastutil.longs.LongCollection |
containsAll, removeAll, retainAll, toArray, toLongArray |
Field Detail |
public static final int DEFAULT_INITIAL_CAPACITY
public static final long serialVersionUID
Constructor Detail |
public LongArrayList(int capacity)
capacity
- the initial capacity of the array list (may be 0).public LongArrayList()
DEFAULT_INITIAL_CAPACITY
capacity.
public LongArrayList(Collection c)
c
- a collection that will be used to fill the array list.public LongArrayList(LongCollection c)
c
- a type-specific collection that will be used to fill the array list.public LongArrayList(LongList l)
l
- a type-specific list that will be used to fill the array list.public LongArrayList(long[] a)
a
- an array whose elements will be used to fill the array list.public LongArrayList(long[] a, int offset, int length)
a
- an array whose elements will be used to fill the array list.offset
- the first element to use.length
- the number of elements to use.public LongArrayList(Iterator i)
i
- an iterator whose returned elements will fill the array list.public LongArrayList(LongIterator i)
i
- a type-specific iterator whose returned elements will fill the array list.Method Detail |
public long[] elements()
public static LongArrayList wrap(long[] a, int length)
a
- an array to wrap.length
- the length of the resulting array list.
public static LongArrayList wrap(long[] a)
a
- an array to wrap.
public void ensureCapacity(int capacity)
capacity
- the new minimum capacity for this array list.public void add(int index, long k)
add
in interface LongList
add
in class AbstractLongList
public boolean add(long k)
add
in interface LongCollection
add
in class AbstractLongCollection
public boolean addAll(int index, LongCollection c)
AbstractLongList
addAll
in interface LongList
addAll
in class AbstractLongList
public boolean addAll(int index, LongList l)
AbstractLongList
addAll
in interface LongList
addAll
in class AbstractLongList
public boolean addAll(LongList l)
AbstractLongList
addAll
in interface LongList
addAll
in class AbstractLongList
public long getLong(int index)
getLong
in interface LongList
List.get(int)
public int indexOf(long k)
indexOf
in interface LongList
indexOf
in class AbstractLongList
public int lastIndexOf(long k)
lastIndexOf
in interface LongList
lastIndexOf
in class AbstractLongList
public long removeLong(int index)
removeLong
in interface LongList
removeLong
in class AbstractLongList
public boolean rem(long k)
LongCollection
remove()
, but the clash
with the similarly named index-based method in the List
interface
forces us to use a distinguished name. For simplicity, the set interfaces reinstates
remove()
.
rem
in interface LongCollection
rem
in class AbstractLongList
public long set(int index, long k)
set
in interface LongList
set
in class AbstractLongList
public void clear()
clear
in interface List
clear
in class AbstractLongCollection
public int size()
size
in interface List
public void size(int size)
LongList
If the specified size is smaller than the current size, the last elements are
discarded. Otherwise, they are filled with 0/null
/false
.
size
in interface LongList
size
in class AbstractLongList
public boolean isEmpty()
Stack
isEmpty
in interface List
isEmpty
in class AbstractLongCollection
public void trim()
ArrayList.trimToSize()
public void trim(int n)
n
, this method does nothing. Otherwise, it trims the
array length to the maximum between n
and size()
.
This method is useful when reusing lists. Clearing a list leaves the array length untouched. If you are reusing a list many times, you can call this method with a typical size to avoid keeping around a very large array just because of a few large transient lists.
n
- the threshold for the trimming.public void getElements(int from, long[] a, int offset, int length)
getElements
in interface LongList
getElements
in class AbstractLongList
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.public void removeElements(int from, int to)
removeElements
in interface LongList
removeElements
in class AbstractLongList
from
- the start index (inclusive).to
- the end index (exclusive).public void addElements(int index, long[] a, int offset, int length)
addElements
in interface LongList
addElements
in class AbstractLongList
index
- the index at which to add elements.a
- the array containing the elements.offset
- the offset of the first element to add.length
- the number of elements to add.public long[] toLongArray(long[] a)
LongCollection
toLongArray
in interface LongCollection
toLongArray
in class AbstractLongCollection
public LongListIterator longListIterator(int index)
LongList
The iterator returned by the List.listIterator()
method and by this
method are identical; however, using this method you can save a type casting.
longListIterator
in interface LongList
List.listIterator(int)
public Object clone()
public boolean equals(LongArrayList l)
This method exists only for sake of efficiency. The implementation inherited from the abstract implementation would already work.
l
- a type-specific array list.
public int compareTo(LongArrayList l)
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |