Class ReverseArrayIterator<T extends Item>

    • Constructor Summary

      Constructors 
      Constructor Description
      ReverseArrayIterator​(T[] items, int start, int end)
      Create an iterator a slice of an array
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()
      Close the iterator.
      T current()
      Get the current item in the sequence.
      ReverseArrayIterator<T> getAnother()
      Get another iterator over the same sequence of items, positioned at the start of the sequence.
      int getLength()
      Get the last position (that is, the number of items in the sequence).
      int getProperties()
      Get properties of this iterator, as a bit-significant integer.
      SequenceIterator<T> getReverseIterator()
      Get an iterator that processes the same items in reverse order.
      boolean hasNext()
      Determine whether there are more items to come.
      T next()
      Get the next item in the sequence.
      int position()
      Get the current position
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • items

        T extends Item[] items
      • index

        int index
      • start

        int start
      • end

        int end
      • current

        T extends Item current
    • Constructor Detail

      • ReverseArrayIterator

        public ReverseArrayIterator​(T[] items,
                                    int start,
                                    int end)
        Create an iterator a slice of an array
        Parameters:
        items - The array of items
        start - The first item in the array to be be used (this will be the last one in the resulting iteration). Zero-based.
        end - The item after the last one in the array to be used (this will be the first one to be returned by the iterator). Zero-based.
    • Method Detail

      • hasNext

        public boolean hasNext()
        Determine whether there are more items to come. Note that this operation is stateless and it is not necessary (or usual) to call it before calling next(). It is used only when there is an explicit need to tell if we are at the last element.
        Specified by:
        hasNext in interface LookaheadIterator<T extends Item>
        Returns:
        true if there are more items in the sequence
      • getLength

        public int getLength()
        Description copied from interface: LastPositionFinder
        Get the last position (that is, the number of items in the sequence). This method is non-destructive: it does not change the state of the iterator. The result is undefined if the next() method of the iterator has already returned null. This method must not be called unless the result of getProperties() on the iterator includes the bit setting SequenceIterator.LAST_POSITION_FINDER
        Specified by:
        getLength in interface LastPositionFinder<T extends Item>
        Returns:
        the number of items in the sequence
      • close

        public void close()
        Description copied from interface: SequenceIterator
        Close the iterator. This indicates to the supplier of the data that the client does not require any more items to be delivered by the iterator. This may enable the supplier to release resources. After calling close(), no further calls on the iterator should be made; if further calls are made, the effect of such calls is undefined.

        (Currently, closing an iterator is important only when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.)

        Specified by:
        close in interface SequenceIterator<T extends Item>
      • getAnother

        public ReverseArrayIterator<T> getAnother()
        Description copied from interface: UnfailingIterator
        Get another iterator over the same sequence of items, positioned at the start of the sequence. It must be possible to call this method at any time, whether none, some, or all of the items in the original iterator have been read. The method is non-destructive: it does not change the state of the original iterator.
        Specified by:
        getAnother in interface SequenceIterator<T extends Item>
        Specified by:
        getAnother in interface UnfailingIterator<T extends Item>
        Returns:
        a new iterator over the same sequence
      • getReverseIterator

        public SequenceIterator<T> getReverseIterator()
        Get an iterator that processes the same items in reverse order. Since this iterator is processing the items backwards, this method returns an ArrayIterator that processes them forwards.
        Specified by:
        getReverseIterator in interface ReversibleIterator<T extends Item>
        Returns:
        a new ArrayIterator