com.saxonica.stream.adjunct

Class ForEachAdjunct

java.lang.Object

com.saxonica.stream.adjunct.StreamingAdjunct

com.saxonica.stream.adjunct.ForEachAdjunct

public class ForEachAdjunct
extends StreamingAdjunct

Compile an xsl:for-each instruction to streaming code. Also handles a path expression compiled as a SlashExpression, that is, one where the right-hand side selects atomic values.

Constructor Summary

Constructors

Constructor and Description
ForEachAdjunct()

Method Summary

Methods

Modifier and Type	Method and Description
FeedMaker	getFeedMaker(Expression expr, int arg) Get a FeedMaker, a factory class that creates a Feed to evaluate this expression in streaming mode.
static int	getStreamability(ContextSwitchingExpression expression, int syntacticContext, boolean allowExtensions, List<String> reasons)
WatchMaker	getWatchMaker(Expression expression, List<String> reasonsForFailure) Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.

Methods inherited from class com.saxonica.stream.adjunct.StreamingAdjunct

getConfiguration, makeStreamingAdjunct, setConfiguration

Methods inherited from class java.lang.Object

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

Constructor Detail

ForEachAdjunct

public ForEachAdjunct()

Method Detail

getWatchMaker

public WatchMaker getWatchMaker(Expression expression,
                       List<String> reasonsForFailure)
                         throws XPathException

Description copied from class: StreamingAdjunct

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 StreamingAdjunct

Parameters:

expression - the expression to be evaluated in streaming mode

reasonsForFailure - if non-null, this is a list supplied by the caller which will be populated by the callee with one or more messages indicating why it was not possible to allocate a WatchMaker. Normally if the list is non-empty on return, the return value from the method will be null.

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

getFeedMaker

public FeedMaker getFeedMaker(Expression expr,
                     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.

Overrides:

getFeedMaker in class StreamingAdjunct

Parameters:

expr - the expression to be evaluated in streaming mode

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.iterateSubExpressions()

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

getStreamability

public static int getStreamability(ContextSwitchingExpression expression,
                   int syntacticContext,
                   boolean allowExtensions,
                   List<String> reasons)