InsertBeforeStreamer

java.lang.Object
- com.saxonica.ee.stream.adjunct.StreamingAdjunct
- - com.saxonica.ee.stream.adjunct.TransmissionAdjunct
  - - com.saxonica.ee.stream.adjunct.InsertBeforeStreamer

All Implemented Interfaces:

FeedMaker
```
public class InsertBeforeStreamer
extends TransmissionAdjunct
implements FeedMaker
```
Implement streaming of insert-before instruction. This is complicated by the fact that we need separate implementations depending on which argument is being streamed.

Constructor Summary

Constructors
Constructor Description

InsertBeforeStreamer()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`WatchMaker`	`getWatchMaker(boolean forGrouping)`	Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.
`ItemFeed`	`makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context)`

Methods inherited from class com.saxonica.ee.stream.adjunct.TransmissionAdjunct
makeTransmissionFlow

Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct
computeStreamability, emptyAdjunctMap, findConsumingArg, genId, getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, makeStreamingAdjunct, setConfiguration, setExpression, toStreamingPattern

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - InsertBeforeStreamer
```
public InsertBeforeStreamer()
```
- Method Detail
  - getWatchMaker
```
public WatchMaker getWatchMaker(boolean forGrouping)
                         throws XPathException
```
    Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode. This method will only be called if the getImplementationMethod() method of the expression includes the value Expression.WATCH_METHOD
    
    Overrides:
    
    getWatchMaker in class TransmissionAdjunct
    
    Parameters:
    
    forGrouping - true if the selected items are being grouped
    
    Returns:
    
    a Watchmaker 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
  - makeItemFeed
```
public ItemFeed makeItemFeed(WatchManager watchManager,
                             ItemFeed out,
                             XPathContext context)
                      throws XPathException
```
    Specified by:
    
    makeItemFeed in interface FeedMaker
    
    Throws:
    
    XPathException