Class WalkingIterator

    • Constructor Detail

      • WalkingIterator

        public WalkingIterator​(PrefixResolver nscontext)
        Create a WalkingIterator object.
        Parameters:
        nscontext - The namespace context for this iterator, should be OK if null.
    • Method Detail

      • clone

        public java.lang.Object clone()
                               throws java.lang.CloneNotSupportedException
        Get a cloned WalkingIterator that holds the same position as this iterator.
        Specified by:
        clone in interface DTMIterator
        Overrides:
        clone in class PredicatedNodeTest
        Returns:
        A clone of this iterator that holds the same node position.
        Throws:
        java.lang.CloneNotSupportedException
      • setRoot

        public void setRoot​(int context,
                            java.lang.Object environment)
        Initialize the context values for this expression after it is cloned.
        Specified by:
        setRoot in interface DTMIterator
        Overrides:
        setRoot in class LocPathIterator
        Parameters:
        context - The XPath runtime context for this transformation.
        environment - The environment object. The environment in which this iterator operates, which should provide:
        • a node (the context node... same value as "root" defined below)
        • a pair of non-zero positive integers (the context position and the context size)
        • a set of variable bindings
        • a function library
        • the set of namespace declarations in scope for the expression.
          • At this time the exact implementation of this environment is application dependent. Probably a proper interface will be created fairly soon.

      • nextNode

        public int nextNode()
        Returns the next node in the set and advances the position of the iterator in the set. After a NodeIterator is created, the first call to nextNode() returns the first node in the set.
        Specified by:
        nextNode in interface DTMIterator
        Specified by:
        nextNode in class LocPathIterator
        Returns:
        The next Node in the set being iterated over, or null if there are no more members in that set.
      • getFirstWalker

        public final AxesWalker getFirstWalker()
        Get the head of the walker list.
        Returns:
        The head of the walker list, or null if this iterator does not implement walkers.
      • setFirstWalker

        public final void setFirstWalker​(AxesWalker walker)
        Set the head of the walker list.
        Parameters:
        walker - Should be a valid AxesWalker.
      • setLastUsedWalker

        public final void setLastUsedWalker​(AxesWalker walker)
        Set the last used walker.
        Parameters:
        walker - The last used walker, or null.
      • getLastUsedWalker

        public final AxesWalker getLastUsedWalker()
        Get the last used walker.
        Returns:
        The last used walker, or null.
      • detach

        public void detach()
        Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. Afterdetach has been invoked, calls to nextNode orpreviousNode will raise the exception INVALID_STATE_ERR.
        Specified by:
        detach in interface DTMIterator
        Overrides:
        detach in class LocPathIterator
      • fixupVariables

        public void fixupVariables​(java.util.Vector vars,
                                   int globalsSize)
        This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
        Overrides:
        fixupVariables in class PredicatedNodeTest
        Parameters:
        vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame).
      • deepEquals

        public boolean deepEquals​(Expression expr)
        Description copied from class: Expression
        Compare this object with another object and see if they are equal, include the sub heararchy.
        Overrides:
        deepEquals in class PredicatedNodeTest
        Parameters:
        expr - Another expression object.
        Returns:
        true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.
        See Also:
        Expression.deepEquals(Expression)