Package com.saxonica.ee.stream.adjunct

## Class MapEntryStreamer

- java.lang.Object
- - com.saxonica.ee.stream.adjunct.StreamingAdjunct
  - - com.saxonica.ee.stream.adjunct.MapEntryStreamer

- All Implemented Interfaces:
    `FeedMaker`

      public class MapEntryStreamer
      extends StreamingAdjunct
      implements FeedMaker

  Streaming code to implement an xsl:map instruction or map constructor, where each map entry is allowed to be consuming. Based on the code of ForkAdjunct

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MapEntryStreamer()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `FeedMaker` | `getFeedMaker​(int arg)` | Get a FeedMaker, a factory class that creates a Feed to evaluate this expression in streaming mode.
    `ItemFeed` | `makeItemFeed​(WatchManager watchManager, ItemFeed out, XPathContext context)` |

    - ### Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct

      `computeStreamability, findConsumingArg, getConfiguration, getDefaultFeedMaker, getExpression, getWatchMaker, makeStreamingAdjunct, setConfiguration, setExpression, toStreamingPattern`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### MapEntryStreamer

          public MapEntryStreamer()

  - ### Method Detail

    - #### getFeedMaker

          public FeedMaker getFeedMaker​(int arg)
                                 throws XPathException

      Description copied from class: `StreamingAdjunct`
      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

    - #### makeItemFeed

          public ItemFeed makeItemFeed​(WatchManager watchManager,
                                       ItemFeed out,
                                       XPathContext context)
                                throws XPathException

      Specified by:
        `makeItemFeed` in interface `FeedMaker`
      Throws:
        `XPathException`