Package it.unimi.dsi.fastutil.longs

Class LongArrayList

    • Field Detail

      • DEFAULT_INITIAL_CAPACITY

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

    • Constructor Detail

      • LongArrayList

        public LongArrayList​(int capacity)
        Creates a new array list with given capacity.
        Parameters:
        capacity - the initial capacity of the array list (may be 0).

      • LongArrayList

        public LongArrayList​(Collection<? extends Long> c)
        Creates a new array list and fills it with a given collection.
        Parameters:
        c - a collection that will be used to fill the array list.

      • LongArrayList

        public LongArrayList​(LongCollection c)
        Creates a new array 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.

      • LongArrayList

        public LongArrayList​(LongList l)
        Creates a new array 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.

      • LongArrayList

        public LongArrayList​(long[] a)
        Creates a new array list and fills it with the elements of a given array.
        Parameters:
        a - an array whose elements will be used to fill the array list.

      • LongArrayList

        public LongArrayList​(long[] a,
                     int offset,
                     int length)
        Creates a new array list and fills it with the elements of a given array.
        Parameters:
        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.

      • LongArrayList

        public LongArrayList​(Iterator<? extends Long> i)
        Creates a new array list and fills it with the elements returned by an iterator..
        Parameters:
        i - an iterator whose returned elements will fill the array list.

      • LongArrayList

        public LongArrayList​(LongIterator i)
        Creates a new array 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 Detail

      • elements

        public long[] elements()
        Returns the backing array of this list.
        Returns:
        the backing array.

      • wrap

        public static LongArrayList wrap​(long[] a,
                                 int length)
        Wraps a given array into an array list of given size.

        Note it is guaranteed that the type of the array returned by elements() will be the same (see the comments in the class documentation).

        Parameters:
        a - an array to wrap.
        length - the length of the resulting array list.
        Returns:
        a new array list of the given size, wrapping the given array.

      • wrap

        public static LongArrayList wrap​(long[] a)
        Wraps a given array into an array list.

        Note it is guaranteed that the type of the array returned by elements() will be the same (see the comments in the class documentation).

        Parameters:
        a - an array to wrap.
        Returns:
        a new array list wrapping the given array.

      • ensureCapacity

        public void ensureCapacity​(int capacity)
        Ensures that this array list can contain the given number of entries without resizing.
        Parameters:
        capacity - the new minimum capacity for this array list.

      • getLong

        public long getLong​(int index)
        Description copied from interface: LongList
        Returns the element at the specified position in this list.
        Specified by:
        getLong in interface LongList
        See Also:
        List.get(int)

      • indexOf

        public int indexOf​(long k)
        Description copied from interface: LongList
        Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
        Specified by:
        indexOf in interface LongList
        Overrides:
        indexOf in class AbstractLongList
        See Also:
        List.indexOf(Object)

      • rem

        public boolean rem​(long k)
        Description copied from class: AbstractLongList
        Removes a single instance of the specified element from this collection, if it is present (optional operation).

        This implementation delegates to indexOf().

        Specified by:
        rem in interface LongCollection
        Overrides:
        rem in class AbstractLongList
        See Also:
        List.remove(Object)

      • size

        public void size​(int size)
        Description copied from interface: LongList
        Sets the size of this list.

        If the specified size is smaller than the current size, the last elements are discarded. Otherwise, they are filled with 0/null/false.

        Specified by:
        size in interface LongList
        Overrides:
        size in class AbstractLongList
        Parameters:
        size - the new size.

      • trim

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

      • trim

        public void trim​(int n)
        Trims the backing array if it is too large. If the current array length is smaller than or equal to 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.

        Parameters:
        n - the threshold for the trimming.

      • getElements

        public 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.
        Specified by:
        getElements in interface LongList
        Overrides:
        getElements in class AbstractLongList
        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​(int from,
                           int to)
        Removes elements of this type-specific list using optimized system calls.
        Specified by:
        removeElements in interface LongList
        Overrides:
        removeElements in class AbstractLongList
        Parameters:
        from - the start index (inclusive).
        to - the end index (exclusive).

      • addElements

        public void addElements​(int index,
                        long[] a,
                        int offset,
                        int length)
        Adds elements to this type-specific list using optimized system calls.
        Specified by:
        addElements in interface LongList
        Overrides:
        addElements in class AbstractLongList
        Parameters:
        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.

      • toArray

        public long[] toArray​(long[] a)
        Description copied from interface: LongCollection
        Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.

        Note that, contrarily to Collection.toArray(Object[]), this methods just writes all elements of this collection: no special value will be added after the last one.

        Specified by:
        toArray in interface LongCollection
        Overrides:
        toArray in class AbstractLongCollection
        Parameters:
        a - if this array is big enough, it will be used to store this collection.
        Returns:
        a primitive type array containing the items of this collection.
        See Also:
        Collection.toArray(Object[])

      • equals

        public boolean equals​(LongArrayList l)
        Compares this type-specific 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 array list.
        Returns:
        true if the argument contains the same elements of this type-specific array list.

      • compareTo

        public int compareTo​(LongArrayList l)
        Compares this array list to another array list.

        This method exists only for sake of efficiency. The implementation inherited from the abstract implementation would already work.

        Parameters:
        l - an array list.
        Returns:
        a negative integer, zero, or a positive integer as this list is lexicographically less than, equal to, or greater than the argument.