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com.saxonica.stream.watch
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<H2>
Package com.saxonica.stream.watch
</H2>
This package contains defines the two interfaces Watch and WatchMaker, and various
implementations of these interfaces.
<P>
<B>See:</B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
<P>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Interface Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/Watch.html" title="interface in com.saxonica.stream.watch">Watch</A></B></TD>
<TD>A Watch represents a class that is interested in looking at nodes passing down a push
pipeline.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/WatchMaker.html" title="interface in com.saxonica.stream.watch">WatchMaker</A></B></TD>
<TD>A WatchMaker is a factory class for creating a <A HREF="../../../../com/saxonica/stream/watch/Watch.html" title="interface in com.saxonica.stream.watch"><CODE>Watch</CODE></A>.</TD>
</TR>
</TABLE>
<P>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Class Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ApplyImportsWatch.html" title="class in com.saxonica.stream.watch">ApplyImportsWatch</A></B></TD>
<TD>Watch for an xsl:apply-imports instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ApplyTemplatesWatch.html" title="class in com.saxonica.stream.watch">ApplyTemplatesWatch</A></B></TD>
<TD>This watch implements xsl:apply-templates in streaming mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ComposingWatch.html" title="class in com.saxonica.stream.watch">ComposingWatch</A></B></TD>
<TD>A ComposingWatch is a Watch that evaluates an expression based on the nodes encountered
in a streamed input document, passing the value of that expression as a sequence of items
to an ItemFeed.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/CopyOfWatch.html" title="class in com.saxonica.stream.watch">CopyOfWatch</A></B></TD>
<TD>This class is used when optimizing a SequentialCopy, that is, when evaluating a construct of the
form saxon:stream(doc('a.xml')/a/b/c).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/CountWatch.html" title="class in com.saxonica.stream.watch">CountWatch</A></B></TD>
<TD>This class is used when a streamed template requests evaluation of the count()
function applied to a streamable pattern</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/EmptyWatch.html" title="class in com.saxonica.stream.watch">EmptyWatch</A></B></TD>
<TD>Streaming watch supporting the empty() function</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/EventPushingWatch.html" title="class in com.saxonica.stream.watch">EventPushingWatch</A></B></TD>
<TD>A EvaluatingWatch is a Watch that evaluates an expression based on the nodes encountered
in a streamed input document, appending the value of that expression to the Watch for the
next expression in the streaming route.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ExistsWatch.html" title="class in com.saxonica.stream.watch">ExistsWatch</A></B></TD>
<TD>Streaming watch supporting the exists() function</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ForEachComposingWatch.html" title="class in com.saxonica.stream.watch">ForEachComposingWatch</A></B></TD>
<TD>This watch implements xsl:for-each in streaming mode, in the case where the select expression is a
pattern that selects events from the streamed input, but the body of the for-each does no further
downwards navigation, and delivers composed items to an ItemFeed acting as the parent expression of the for-each.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ForEachWatch.html" title="class in com.saxonica.stream.watch">ForEachWatch</A></B></TD>
<TD>This watch implements xsl:for-each in streaming mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/ForkingFeed.html" title="class in com.saxonica.stream.watch">ForkingFeed</A></B></TD>
<TD>Watch for an xsl:fork instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/IterateWatch.html" title="class in com.saxonica.stream.watch">IterateWatch</A></B></TD>
<TD>This watch implements xsl:iterate in streaming mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/NextMatchWatch.html" title="class in com.saxonica.stream.watch">NextMatchWatch</A></B></TD>
<TD>Watch for an xsl:next-match instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/NonstreamingExpressionWatch.html" title="class in com.saxonica.stream.watch">NonstreamingExpressionWatch</A></B></TD>
<TD>This watch is used for a streamed template that makes no access to descendant nodes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/SimpleContentWatch.html" title="class in com.saxonica.stream.watch">SimpleContentWatch</A></B></TD>
<TD>This class is used when a streaming template requests evaluation of a simple content constructor
in streaming mode (that is, when it constructs a text, attribute, comment, or PI node based on the
contents of the streamed document).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/StringValueAccumulator.html" title="class in com.saxonica.stream.watch">StringValueAccumulator</A></B></TD>
<TD>A StringValueAccumulator is a Receiver that computes the string value of an element in streaming mode, by
copying all the text nodes to a supplied receiver.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/StringValueWatch.html" title="class in com.saxonica.stream.watch">StringValueWatch</A></B></TD>
<TD>This class is used when a streamed template requests evaluation of the string value
of the nodes selected by a path expression, typically in response to an xsl:value-of instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/TypedValueWatch.html" title="class in com.saxonica.stream.watch">TypedValueWatch</A></B></TD>
<TD>This class is used when a streamed template requests evaluation of the typed value
of the nodes selected by a path expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/VoidWatch.html" title="class in com.saxonica.stream.watch">VoidWatch</A></B></TD>
<TD>This class is a Watch that always returns an empty sequence as its result.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/VoidWatchMaker.html" title="class in com.saxonica.stream.watch">VoidWatchMaker</A></B></TD>
<TD>A singleton WatchMaker that returns the singleton <A HREF="../../../../com/saxonica/stream/watch/VoidWatch.html" title="class in com.saxonica.stream.watch"><CODE>VoidWatch</CODE></A></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../com/saxonica/stream/watch/WatchManager.html" title="class in com.saxonica.stream.watch">WatchManager</A></B></TD>
<TD>This class sits on a push pipeline and evaluates the passing element and attribute
nodes.</TD>
</TR>
</TABLE>
<P>
<A NAME="package_description"><!-- --></A><H2>
Package com.saxonica.stream.watch Description
</H2>
<P>
<p>This package contains defines the two interfaces Watch and WatchMaker, and various
implementations of these interfaces.</p>
<p>A Watch is used on a streaming pipeline to recognize specific events, such as the start
of a selected element, and to take action when these events occur. A WatchMaker is a factory
class for creating a particular kind of Watch. The WatchManager is a class that sits on the Receiver
pipeline keeping track of which Watches are active, and notifying them of events so that they can
decide whether they are of interest.</p>
<p align="center"><i>Michael H. Kay<br/>
Saxonica Limited<br/>
28 November 2011</i></p>
<P>
<P>
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