com.saxonica.ee.stream.feed

Class CallableFeed

java.lang.Object

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.feed.CallableFeed

All Implemented Interfaces:

Feed

public class CallableFeed
extends ItemFeed

A CallableFeed is used to wrap an expression that does (a) not have intrinsic capability to accept streamed input, and (b) does not expect any operand to be a sequence, and (c) implements the Callable interface.

Constructor Summary

Constructors

Constructor and Description
CallableFeed(Callable function, Feed result, XPathContext context, Expression[] arguments) Create a Feed that evaluates a Callable (often but not necessarily a function)

Method Summary

Modifier and Type	Method and Description
void	close() Finish evaluating the expression.
void	processItem(Item<?> item) Supply an item to the feed

Methods inherited from class com.saxonica.ee.stream.feed.ItemFeed

dynamicError, endSelectedParentNode, getContext, getExpression, getPipelineConfiguration, getReceiver, getResult, getTerminator, hasFailed, open, processItems, setExpression, setHasFailed, setPipelineConfiguration, setTerminator, startSelectedParentNode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CallableFeed

public CallableFeed(Callable function,
                    Feed result,
                    XPathContext context,
                    Expression[] arguments)

Create a Feed that evaluates a Callable (often but not necessarily a function)

Parameters:

function - the function or other Callable

result - the place to send the results of evaluating this Callable

context - dynamic context information

arguments - the arguments to the Callable. Typically one of these is Consuming. The expression receives its input for the consuming argument via the processItem() call, and it then evaluates the other (non-streamed) arguments by calling iterate() on them.

Method Detail

processItem

public void processItem(Item<?> item)
                 throws XPathException

Supply an item to the feed

Specified by:

processItem in interface Feed

Specified by:

processItem in class ItemFeed

Parameters:

item - the item being fed

Throws:

XPathException - to report any failure

close

public void close()
           throws XPathException

Description copied from class: ItemFeed

Finish evaluating the expression. The default implementation does nothing.

Specified by:

close in interface Feed

Overrides:

close in class ItemFeed

Throws:

XPathException - if a dynamic error occurs