net.sf.saxon.expr
Class RangeExpression.RangeIterator

java.lang.Object
  extended bynet.sf.saxon.expr.RangeExpression.RangeIterator
All Implemented Interfaces:
LastPositionFinder, LookaheadIterator, ReversibleIterator, SequenceIterator
Enclosing class:
RangeExpression

public static class RangeExpression.RangeIterator
extends java.lang.Object
implements SequenceIterator, ReversibleIterator, LastPositionFinder, LookaheadIterator

Iterator that produces numeric values in a monotonic sequence, ascending or descending


Constructor Summary
RangeExpression.RangeIterator(long start, long end)
           
 
Method Summary
 Item current()
          Get the current value in the sequence (the one returned by the most recent call on next()).
 SequenceIterator getAnother()
          Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence.
 int getLastPosition()
          Get the last position (that is, the number of items in the sequence)
 SequenceIterator getReverseIterator()
          Get a new SequenceIterator that returns the same items in reverse order.
 boolean hasNext()
          Determine whether there are more items to come.
 Item 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
 

Constructor Detail

RangeExpression.RangeIterator

public RangeExpression.RangeIterator(long start,
                                     long end)
Method Detail

hasNext

public boolean hasNext()
Description copied from interface: LookaheadIterator
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
Returns:
true if there are more nodes

next

public Item next()
Description copied from interface: SequenceIterator
Get the next item in the sequence.

Specified by:
next in interface SequenceIterator
Returns:
the next item, or null if there are no more items.

current

public Item current()
Description copied from interface: SequenceIterator
Get the current value in the sequence (the one returned by the most recent call on next()). This will be null before the first call of next().

Specified by:
current in interface SequenceIterator
Returns:
the current item, the one most recently returned by a call on next(); or null, if next() has not been called, or if the end of the sequence has been reached.

position

public int position()
Description copied from interface: SequenceIterator
Get the current position. This will be zero before the first call on next(), otherwise it will be the number of times that next() has been called.

Specified by:
position in interface SequenceIterator
Returns:
the current position, the position of the item returned by the most recent call of next()

getLastPosition

public int getLastPosition()
Description copied from interface: LastPositionFinder
Get the last position (that is, the number of items in the sequence)

Specified by:
getLastPosition in interface LastPositionFinder

getAnother

public SequenceIterator getAnother()
                            throws XPathException
Description copied from interface: SequenceIterator
Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence.

Specified by:
getAnother in interface SequenceIterator
Returns:
a SequenceIterator that iterates over the same items, positioned before the first item
Throws:
XPathException - if any error occurs

getReverseIterator

public SequenceIterator getReverseIterator()
Description copied from interface: ReversibleIterator
Get a new SequenceIterator that returns the same items in reverse order. If this SequenceIterator is an AxisIterator, then the returned SequenceIterator must also be an AxisIterator.

Specified by:
getReverseIterator in interface ReversibleIterator