Interface ContextMappingFunction

  • All Known Implementing Classes:
    AnalyzeMappingFunction, ForEach, ForEachGroup, MergeInstr.MergeKeyMappingFunction

    public interface ContextMappingFunction
    ContextMappingFunction is an interface that must be satisfied by an object passed to a ContextMappingIterator. It represents an object which, given an Item, can return a SequenceIterator that delivers a sequence of zero or more Items.

    This is a specialization of the more general MappingFunction class: it differs in that each item being processed becomes the context item while it is being processed.

    • Method Detail

      • map

        SequenceIterator map​(XPathContext context)
                      throws XPathException
        Map one item to a sequence.
        Parameters:
        context - The processing context. The item to be mapped is the context item identified from this context: the values of position() and last() also relate to the set of items being mapped
        Returns:
        a SequenceIterator over the sequence of items that the supplied input item maps to
        Throws:
        XPathException - if a dynamic error is detected