Class PrependIterator

java.lang.Object
net.sf.saxon.om.PrependIterator
All Implemented Interfaces:
AxisIterator, SequenceIterator, UnfailingIterator

public class PrependIterator extends Object implements AxisIterator
An iterator over nodes, that prepends a given node to the nodes returned by another iterator. Used to modify an iterator over axis A to one that iterates over A-OR-SELF.
  • Constructor Details

  • Method Details

    • moveNext

      public boolean moveNext()
      Move to the next node, without returning it. Returns true if there is a next node, false if the end of the sequence has been reached. After calling this method, the current node may be retrieved using the current() function.
      Specified by:
      moveNext in interface AxisIterator
    • next

      public Item next()
      Get the next item in the sequence.
      Specified by:
      next in interface SequenceIterator
      Specified by:
      next in interface UnfailingIterator
      Returns:
      the next Item. If there are no more nodes, return null.
    • current

      public Item current()
      Get the current item in the sequence.
      Specified by:
      current in interface SequenceIterator
      Specified by:
      current in interface UnfailingIterator
      Returns:
      the current item, that is, the item most recently returned by next()
    • position

      public int position()
      Get the current position
      Specified by:
      position in interface SequenceIterator
      Specified by:
      position in interface UnfailingIterator
      Returns:
      the position of the current item (the item most recently returned by next()), starting at 1 for the first node
    • 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
    • iterateAxis

      public AxisIterator iterateAxis(byte axis, NodeTest test)
      Return an iterator over an axis, starting at the current node.
      Specified by:
      iterateAxis in interface AxisIterator
      Parameters:
      axis - the axis to iterate over, using a constant such as Axis.CHILD
      test - a predicate to apply to the nodes before returning them.
      Throws:
      NullPointerException - if there is no current node
    • atomize

      public Value atomize() throws XPathException
      Return the atomized value of the current node.
      Specified by:
      atomize in interface AxisIterator
      Returns:
      the atomized value.
      Throws:
      NullPointerException - if there is no current node
      XPathException
    • getStringValue

      public CharSequence getStringValue()
      Return the string value of the current node.
      Specified by:
      getStringValue in interface AxisIterator
      Returns:
      the string value, as an instance of CharSequence.
      Throws:
      NullPointerException - if there is no current node
    • getAnother

      public SequenceIterator getAnother()
      Get another iterator over the same sequence of items, positioned at the start of the sequence
      Specified by:
      getAnother in interface SequenceIterator
      Specified by:
      getAnother in interface UnfailingIterator
      Returns:
      a new iterator over the same sequence
    • getProperties

      public int getProperties()
      Get properties of this iterator, as a bit-significant integer.
      Specified by:
      getProperties in interface SequenceIterator
      Returns:
      the properties of this iterator. This will be some combination of properties such as SequenceIterator.GROUNDED, SequenceIterator.LAST_POSITION_FINDER, and SequenceIterator.LOOKAHEAD. It is always acceptable to return the value zero, indicating that there are no known special properties. It is acceptable for the properties of the iterator to change depending on its state.