Class ShortHeapIndirectPriorityQueue

java.lang.Object
it.unimi.dsi.fastutil.shorts.ShortHeapSemiIndirectPriorityQueue
it.unimi.dsi.fastutil.shorts.ShortHeapIndirectPriorityQueue
All Implemented Interfaces:
IndirectPriorityQueue<java.lang.Short>, ShortIndirectPriorityQueue

public class ShortHeapIndirectPriorityQueue
extends ShortHeapSemiIndirectPriorityQueue
A type-specific heap-based indirect priority queue.

Instances of this class use an additional inversion array, of the same length of the reference array, to keep track of the heap position containing a given element of the reference array. The priority queue is represented using a heap. The heap is enlarged as needed, but it is never shrunk. Use the ShortHeapSemiIndirectPriorityQueue.trim() method to reduce its size, if necessary.

Implementation Specification:
This implementation does not allow one to enqueue several times the same index.
  • Constructor Details

    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int capacity, ShortComparator c)
      Creates a new empty queue with a given capacity and comparator.
      Parameters:
      refArray - the reference array.
      capacity - the initial capacity of this queue.
      c - the comparator used in this queue, or null for the natural order.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int capacity)
      Creates a new empty queue with a given capacity and using the natural order.
      Parameters:
      refArray - the reference array.
      capacity - the initial capacity of this queue.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, ShortComparator c)
      Creates a new empty queue with capacity equal to the length of the reference array and a given comparator.
      Parameters:
      refArray - the reference array.
      c - the comparator used in this queue, or null for the natural order.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray)
      Creates a new empty queue with capacity equal to the length of the reference array and using the natural order.
      Parameters:
      refArray - the reference array.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int[] a, int size, ShortComparator c)
      Wraps a given array in a queue using a given comparator.

      The queue returned by this method will be backed by the given array. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      Parameters:
      refArray - the reference array.
      a - an array of indices into refArray.
      size - the number of elements to be included in the queue.
      c - the comparator used in this queue, or null for the natural order.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int[] a, ShortComparator c)
      Wraps a given array in a queue using a given comparator.

      The queue returned by this method will be backed by the given array. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      Parameters:
      refArray - the reference array.
      a - an array of indices into refArray.
      c - the comparator used in this queue, or null for the natural order.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int[] a, int size)
      Wraps a given array in a queue using the natural order.

      The queue returned by this method will be backed by the given array. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      Parameters:
      refArray - the reference array.
      a - an array of indices into refArray.
      size - the number of elements to be included in the queue.
    • ShortHeapIndirectPriorityQueue

      public ShortHeapIndirectPriorityQueue​(short[] refArray, int[] a)
      Wraps a given array in a queue using the natural order.

      The queue returned by this method will be backed by the given array. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      Parameters:
      refArray - the reference array.
      a - an array of indices into refArray.
  • Method Details