Package it.unimi.dsi.fastutil.objects

Class ReferenceBigArrayBigList<K>

java.lang.Object
java.util.AbstractCollection<K>
it.unimi.dsi.fastutil.objects.AbstractReferenceCollection<K>
it.unimi.dsi.fastutil.objects.AbstractReferenceBigList<K>
it.unimi.dsi.fastutil.objects.ReferenceBigArrayBigList<K>
All Implemented Interfaces:
it.unimi.dsi.fastutil.BigList<K>, it.unimi.dsi.fastutil.objects.ObjectIterable<K>, ReferenceBigList<K>, ReferenceCollection<K>, it.unimi.dsi.fastutil.Size64, it.unimi.dsi.fastutil.Stack<K>, java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<K>, java.util.Collection<K>, java.util.RandomAccess
public class ReferenceBigArrayBigList<K>
extends AbstractReferenceBigList<K>
implements java.util.RandomAccess, java.lang.Cloneable, java.io.Serializable
A type-specific big-array-based big list; provides some additional methods that use polymorphism to avoid (un)boxing.

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:
ArrayList, Serialized Form

  • Nested Class Summary

    Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceBigList

    AbstractReferenceBigList.ReferenceRandomAccessSubList<K>, AbstractReferenceBigList.ReferenceSubList<K>

  • Field Summary

    Fields
    Modifier and Type Field Description
    static int DEFAULT_INITIAL_CAPACITY
    The initial default capacity of a big-array big list.

  • Constructor Summary

    Constructors
    Constructor Description
    ReferenceBigArrayBigList()
    Creates a new big-array big list with DEFAULT_INITIAL_CAPACITY capacity.
    ReferenceBigArrayBigList​(long capacity)
    Creates a new big-array big list with given capacity.
    ReferenceBigArrayBigList​(it.unimi.dsi.fastutil.objects.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​(java.util.Collection<? extends K> c)
    Creates a new big-array big list and fills it with a given collection.
    ReferenceBigArrayBigList​(java.util.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 Type Method Description
    void add​(long index, K k)
    boolean add​(K k)
    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, java.util.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()
    ReferenceBigArrayBigList<K> 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 equals​(ReferenceBigArrayBigList<K> l)
    Compares this type-specific big-array list to another one.
    boolean equals​(java.lang.Object o)  
    void forEach​(java.util.function.Consumer<? super K> action)
    K get​(long index)  
    void getElements​(long from, java.lang.Object[][] a, long offset, long length)
    Copies element of this type-specific list into the given big array using optimized system calls.
    long indexOf​(java.lang.Object k)  
    boolean isEmpty()  
    long lastIndexOf​(java.lang.Object k)  
    it.unimi.dsi.fastutil.objects.ObjectBigListIterator<K> 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.
    K remove​(long index)
    boolean remove​(java.lang.Object k)  
    boolean removeAll​(java.util.Collection<?> c)  
    void removeElements​(long from, long to)
    Removes elements of this type-specific list using optimized system calls.
    K set​(long index, K k)
    void setElements​(long index, java.lang.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)  
    long size64()  
    it.unimi.dsi.fastutil.objects.ObjectSpliterator<K> spliterator()
    Returns a type-specific spliterator on the elements of this big-list.
    ReferenceBigList<K> subList​(long from, long to)
    Returns a type-specific view of the portion of this type-specific big list from the index from, inclusive, to the index to, exclusive.
    static <K> java.util.stream.Collector<K,​?,​ReferenceBigArrayBigList<K>> toBigList()
    Returns a Collector that collects a Stream's elements into a new ArrayList.
    static <K> java.util.stream.Collector<K,​?,​ReferenceBigArrayBigList<K>> toBigListWithExpectedSize​(long expectedSize)
    Returns a Collector that collects a Stream'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 class java.lang.Object

    getClass, notify, notifyAll, wait, wait, wait

    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

  • Field Details

    • DEFAULT_INITIAL_CAPACITY

      public static final int DEFAULT_INITIAL_CAPACITY
      The initial default capacity of a big-array big list.
      See Also:
      Constant Field Values

  • 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 with DEFAULT_INITIAL_CAPACITY capacity.

    • ReferenceBigArrayBigList

      public ReferenceBigArrayBigList​(ReferenceCollection<? extends K> c)
      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

      public ReferenceBigArrayBigList​(java.util.Collection<? extends K> c)
      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

      public ReferenceBigArrayBigList​(ReferenceBigList<? extends K> l)
      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

      public ReferenceBigArrayBigList​(K[][] a)
      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

      public 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.
      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

      public ReferenceBigArrayBigList​(java.util.Iterator<? extends K> i)
      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

      public ReferenceBigArrayBigList​(it.unimi.dsi.fastutil.objects.ObjectIterator<? extends K> i)
      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.

  • Method Details

    • elements

      public K[][] 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

      public static <K> ReferenceBigArrayBigList<K> wrap​(K[][] a, long length)
      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

      public static <K> ReferenceBigArrayBigList<K> wrap​(K[][] a)
      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

      public static <K> ReferenceBigArrayBigList<K> of()
      Creates a new empty big array list.
      Returns:
      a new empty big-array big list.

    • of

      @SafeVarargs public static <K> ReferenceBigArrayBigList<K> of​(K... init)
      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:
      BigArrays.wrap(byte[])

    • toBigList

      public static <K> java.util.stream.Collector<K,​?,​ReferenceBigArrayBigList<K>> toBigList()
      Returns a Collector that collects a Stream's elements into a new ArrayList.

    • toBigListWithExpectedSize

      public static <K> java.util.stream.Collector<K,​?,​ReferenceBigArrayBigList<K>> toBigListWithExpectedSize​(long expectedSize)
      Returns a Collector that collects a Stream'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

      public void add​(long index, K k)
      Description copied from class: AbstractReferenceBigList
      Specified by:
      add in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      add in class AbstractReferenceBigList<K>

    • add

      public boolean add​(K k)
      Description copied from class: AbstractReferenceBigList
      Specified by:
      add in interface java.util.Collection<K>
      Overrides:
      add in class AbstractReferenceBigList<K>

    • get

      public K get​(long index)
      Specified by:
      get in interface it.unimi.dsi.fastutil.BigList<K>

    • indexOf

      public long indexOf​(java.lang.Object k)
      Specified by:
      indexOf in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      indexOf in class AbstractReferenceBigList<K>

    • lastIndexOf

      public long lastIndexOf​(java.lang.Object k)
      Specified by:
      lastIndexOf in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      lastIndexOf in class AbstractReferenceBigList<K>

    • remove

      public K remove​(long index)
      Description copied from class: AbstractReferenceBigList
      Specified by:
      remove in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      remove in class AbstractReferenceBigList<K>

    • remove

      public boolean remove​(java.lang.Object k)
      Specified by:
      remove in interface java.util.Collection<K>
      Overrides:
      remove in class java.util.AbstractCollection<K>

    • set

      public K set​(long index, K k)
      Description copied from class: AbstractReferenceBigList
      Specified by:
      set in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      set in class AbstractReferenceBigList<K>

    • removeAll

      public boolean removeAll​(java.util.Collection<?> c)
      Specified by:
      removeAll in interface java.util.Collection<K>
      Overrides:
      removeAll in class java.util.AbstractCollection<K>

    • addAll

      public boolean addAll​(long index, java.util.Collection<? extends K> c)
      Description copied from class: AbstractReferenceBigList
      Adds all of the elements in the specified collection to this list (optional operation).
      Specified by:
      addAll in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      addAll in class AbstractReferenceBigList<K>

    • addAll

      public boolean addAll​(long index, ReferenceBigList<? extends K> list)
      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 interface ReferenceBigList<K>
      See Also:
      BigList.addAll(long,Collection)

    • addAll

      public boolean addAll​(long index, ReferenceList<? extends K> list)
      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 interface ReferenceBigList<K>
      See Also:
      BigList.addAll(long,Collection)

    • clear

      public void clear()
      Description copied from class: AbstractReferenceBigList
      Specified by:
      clear in interface java.util.Collection<K>
      Overrides:
      clear in class AbstractReferenceBigList<K>

    • size64

      public long size64()
      Specified by:
      size64 in interface it.unimi.dsi.fastutil.Size64

    • size

      public void size​(long size)
      Specified by:
      size in interface it.unimi.dsi.fastutil.BigList<K>
      Overrides:
      size in class AbstractReferenceBigList<K>

    • isEmpty

      public boolean isEmpty()
      Specified by:
      isEmpty in interface java.util.Collection<K>
      Specified by:
      isEmpty in interface it.unimi.dsi.fastutil.Stack<K>
      Overrides:
      isEmpty in class java.util.AbstractCollection<K>

    • trim

      public void trim()
      Trims this big-array big list so that the capacity is equal to the size.
      See Also:
      ArrayList.trimToSize()

    • 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 to n, this method does nothing. Otherwise, it trims the big-array length to the maximum between n and size64().

      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

      public ReferenceBigList<K> subList​(long from, long to)
      Description copied from interface: ReferenceBigList
      Returns a type-specific view of the portion of this type-specific big list from the index from, inclusive, to the index to, exclusive.
      Specified by:
      subList in interface it.unimi.dsi.fastutil.BigList<K>
      Specified by:
      subList in interface ReferenceBigList<K>
      Overrides:
      subList in class AbstractReferenceBigList<K>
      See Also:
      BigList.subList(long,long)

    • getElements

      public void getElements​(long from, java.lang.Object[][] a, long offset, long length)
      Copies element of this type-specific list into the given big array using optimized system calls.
      Specified by:
      getElements in interface ReferenceBigList<K>
      Overrides:
      getElements in class AbstractReferenceBigList<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.

    • removeElements

      public void removeElements​(long from, long to)
      Removes elements of this type-specific list using optimized system calls.
      Specified by:
      removeElements in interface ReferenceBigList<K>
      Overrides:
      removeElements in class AbstractReferenceBigList<K>
      Parameters:
      from - the start index (inclusive).
      to - the end index (exclusive).

    • addElements

      public void addElements​(long index, K[][] a, long offset, long length)
      Adds elements to this type-specific list using optimized system calls.
      Specified by:
      addElements in interface ReferenceBigList<K>
      Overrides:
      addElements in class AbstractReferenceBigList<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.

    • setElements

      public void setElements​(long index, java.lang.Object[][] a, long offset, long length)
      Copies elements in the given big array into this type-specific list using optimized system calls.
      Specified by:
      setElements in interface ReferenceBigList<K>
      Overrides:
      setElements in class AbstractReferenceBigList<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.

    • forEach

      public void forEach​(java.util.function.Consumer<? super K> action)
      Description copied from class: AbstractReferenceBigList
      Specified by:
      forEach in interface java.lang.Iterable<K>
      Overrides:
      forEach in class AbstractReferenceBigList<K>

    • listIterator

      public it.unimi.dsi.fastutil.objects.ObjectBigListIterator<K> listIterator​(long index)
      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 interface it.unimi.dsi.fastutil.BigList<K>
      Specified by:
      listIterator in interface ReferenceBigList<K>
      Overrides:
      listIterator in class AbstractReferenceBigList<K>
      See Also:
      BigList.listIterator(long)

    • spliterator

      public it.unimi.dsi.fastutil.objects.ObjectSpliterator<K> 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 and Spliterator.ORDERED.

      See List.spliterator() for more documentation on the requirements of the returned spliterator (despite BigList not being a List, most of the same requirements apply.

      Specified by:
      spliterator in interface java.util.Collection<K>
      Specified by:
      spliterator in interface java.lang.Iterable<K>
      Specified by:
      spliterator in interface it.unimi.dsi.fastutil.objects.ObjectIterable<K>
      Specified by:
      spliterator in interface ReferenceBigList<K>
      Specified by:
      spliterator in interface ReferenceCollection<K>
      Returns:
      a type-specific spliterator on the elements of this collection.

    • clone

      public ReferenceBigArrayBigList<K> clone()

    • equals

      public boolean equals​(ReferenceBigArrayBigList<K> l)
      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

      public boolean equals​(java.lang.Object o)
      Specified by:
      equals in interface java.util.Collection<K>
      Overrides:
      equals in class AbstractReferenceBigList<K>