Package extra166y

Class ParallelArrayWithBounds<T>

Direct Known Subclasses:
ParallelArray

public abstract class ParallelArrayWithBounds<T> extends ParallelArrayWithFilter<T>
A prefix view of ParallelArray that causes operations to apply only to elements within a given range. Instances of this class may be constructed only via prefix methods of ParallelArray or its other prefix classes.
  • Method Details

    • withBounds

      public abstract ParallelArrayWithBounds<T> withBounds(int firstIndex, int upperBound)
      Returns an operation prefix that causes a method to operate only on the elements of the array between firstIndex (inclusive) and upperBound (exclusive). The bound arguments are relative to the current bounds. For example pa.withBounds(2, 8).withBounds(3, 5) indexes the 5th (= 2+3) and 6th elements of pa. However, indices returned by methods such as indexOf are with respect to the underlying ParallelArray.
      Parameters:
      firstIndex - the lower bound (inclusive)
      upperBound - the upper bound (exclusive)
      Returns:
      operation prefix
    • indexOf

      public abstract int indexOf(T target)
      Returns the index of some element equal to given target, or -1 if not present
      Parameters:
      target - the element to search for
      Returns:
      the index or -1 if not present
    • binarySearch

      public abstract int binarySearch(T target)
      Assuming this array is sorted, returns the index of an element equal to given target, or -1 if not present. If the array is not sorted, the results are undefined.
      Parameters:
      target - the element to search for
      Returns:
      the index or -1 if not present
    • binarySearch

      public abstract int binarySearch(T target, Comparator<? super T> comparator)
      Assuming this array is sorted with respect to the given comparator, returns the index of an element equal to given target, or -1 if not present. If the array is not sorted, the results are undefined.
      Parameters:
      target - the element to search for
      comparator - the comparator
      Returns:
      the index or -1 if not present
    • cumulate

      public abstract ParallelArrayWithBounds<T> cumulate(Ops.Reducer<T> reducer, T base)
      Replaces each element with the running cumulation of applying the given reducer.
      Parameters:
      reducer - the reducer
      base - the result for an empty array
      Returns:
      this (to simplify use in expressions)
    • precumulate

      public abstract T precumulate(Ops.Reducer<T> reducer, T base)
      Replaces each element with the cumulation of applying the given reducer to all previous values, and returns the total reduction.
      Parameters:
      reducer - the reducer
      base - the result for an empty array
      Returns:
      the total reduction
    • sort

      public abstract ParallelArrayWithBounds<T> sort(Comparator<? super T> cmp)
      Sorts the elements. Unlike Arrays.sort, this sort does not guarantee that elements with equal keys maintain their relative position in the array.
      Parameters:
      cmp - the comparator to use
      Returns:
      this (to simplify use in expressions)
    • sort

      public abstract ParallelArrayWithBounds<T> sort()
      Sorts the elements, assuming all elements are Comparable. Unlike Arrays.sort, this sort does not guarantee that elements with equal keys maintain their relative position in the array.
      Returns:
      this (to simplify use in expressions)
      Throws:
      ClassCastException - if any element is not Comparable.