WatchMaker

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface WatchMaker
```
A WatchMaker is a factory class for creating a Watch.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Trigger`	`makeWatch(WatchManager watchManager, ItemFeed out, XPathContext context)`	Make a Trigger: this comprises (a) a pattern to match the nodes that should be processed during a streaming pass of the source document, and (b) the processing of those nodes by a WatchAction or perhaps a sequence of WatchActions in a pipeline.

- Method Detail
  - makeWatch
```
Trigger makeWatch(WatchManager watchManager,
                  ItemFeed out,
                  XPathContext context)
           throws XPathException
```
    Make a Trigger: this comprises (a) a pattern to match the nodes that should be processed during a streaming pass of the source document, and (b) the processing of those nodes by a WatchAction or perhaps a sequence of WatchActions in a pipeline. If a pipeline is needed, this method is responsible for constructing the entire pipeline
    
    Parameters:
    
    watchManager - the WatchManager
    
    out - the destination for events representing the output of this pipeline
    
    context - the dynamic evaluation context
    
    Returns:
    
    the new Trigger
    
    Throws:
    
    XPathException - if any dynamic error occurs