Class MultiIndex.SelectedItemsIterator

    • Constructor Detail

      • SelectedItemsIterator

        public SelectedItemsIterator​(GroundedValue indexedValue,
                                     IntSet selection)
    • Method Detail

      • supportsHasNext

        public boolean supportsHasNext()
        Description copied from interface: LookaheadIterator
        Ask whether the hasNext() method can be called. This method must be called before calling hasNext(), because some iterators implement this interface, but only support look-ahead under particular circumstances (this is usually because they delegate to another iterator)
        Specified by:
        supportsHasNext in interface LookaheadIterator
        true if the LookaheadIterator.hasNext() method is available
      • 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.

        This method must not be called unless the result of supportsHasNext() is true.

        Specified by:
        hasNext in interface LookaheadIterator
        true if there are more items in the sequence
      • next

        public Item next()
        Get the next item in the sequence. This method changes the state of the iterator, in particular it affects the result of subsequent calls of position() and current().
        Specified by:
        next in interface SequenceIterator
        the next item, or null if there are no more items. Once a call on next() has returned null, no further calls should be made. The preferred action for an iterator if subsequent calls on next() are made is to return null again, and all implementations within Saxon follow this rule.
      • supportsGetLength

        public boolean supportsGetLength()
        Ask whether this iterator supports use of the getLength() method. This method should always be called before calling getLength(), because an iterator that implements this interface may support use of getLength() in some situations and not in others
        Specified by:
        supportsGetLength in interface LastPositionFinder
        true if the getLength() method can be called to determine the length of the underlying sequence.
      • getLength

        public int getLength()
        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 supportsGetLength() is true.

        Specified by:
        getLength in interface LastPositionFinder
        the number of items in the sequence