getFeedMaker
public FeedMaker getFeedMaker(int arg)
throws XPathException
Get a FeedMaker, a factory class that creates a Feed to evaluate this expression
in streaming mode. In many cases the StreamingAdjunct is itself a FeedMaker, in which
case it returns itself. But where an expression has several operands, it will typically
create different feeds depending on which argument is the streamed input, and in such cases
the individual StreamingAdjunct makes the decision which feed to use, by returning an
appropriate FeedMaker.
- Overrides:
getFeedMaker
in class StreamingAdjunct
- Parameters:
arg
- identifies the argument with respect to which the expression is to be inverted:
usually 0 to indicate the first argument is the value that is streamed. Argument numbering
is the same as the sequence of arguments/operands returned by the method Expression.operands()
- Returns:
- a FeedMaker to evaluate the expression, or null if it is not streamable with respect
to the specificed argument.
- Throws:
XPathException
- in the event of a failure