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ItemFeed
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SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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com.saxonica.stream.feed</FONT>
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Class ItemFeed</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.saxonica.stream.feed.ItemFeed</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../com/saxonica/stream/feed/AdjacentTextNodeMergerFeed.html" title="class in com.saxonica.stream.feed">AdjacentTextNodeMergerFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/AtomizerFeed.html" title="class in com.saxonica.stream.feed">AtomizerFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/AvgFeed.html" title="class in com.saxonica.stream.feed">AvgFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/BufferingFeed.html" title="class in com.saxonica.stream.feed">BufferingFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/CardinalityCheckingFeed.html" title="class in com.saxonica.stream.feed">CardinalityCheckingFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/CountFeed.html" title="class in com.saxonica.stream.feed">CountFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/DistinctValuesFeed.html" title="class in com.saxonica.stream.feed">DistinctValuesFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/EmptyTextNodeRemoverFeed.html" title="class in com.saxonica.stream.feed">EmptyTextNodeRemoverFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/FilterExpressionFeed.html" title="class in com.saxonica.stream.feed">FilterExpressionFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/ForEachFeed.html" title="class in com.saxonica.stream.feed">ForEachFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/GeneralComparisonFeed.html" title="class in com.saxonica.stream.feed">GeneralComparisonFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/ItemMappingFeed.html" title="class in com.saxonica.stream.feed">ItemMappingFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/MinimaxFeed.html" title="class in com.saxonica.stream.feed">MinimaxFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/NextIterationFeed.html" title="class in com.saxonica.stream.feed">NextIterationFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/SimpleNodeConstructorFeed.html" title="class in com.saxonica.stream.feed">SimpleNodeConstructorFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/StringJoinFeed.html" title="class in com.saxonica.stream.feed">StringJoinFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/SumFeed.html" title="class in com.saxonica.stream.feed">SumFeed</A>, <A HREF="../../../../com/saxonica/stream/feed/WithParamFeed.html" title="class in com.saxonica.stream.feed">WithParamFeed</A></DD>
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<DT><PRE>public abstract class <B>ItemFeed</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></DL>
</PRE>
<P>
An ItemFeed evaluates an expression in "composed push" mode. Its streaming input
is supplied via a sequence of append() calls that supply individual (composed) items
in the input sequence, and its output is (in most cases) delivered via a sequence of
append() calls to the feed representing the parent expression. The exception is
the FeedToReceiver class which appends the supplied items to a Receiver.
Every kind of expression can be evaluated using an ItemFeed. The ItemFeed is obtained
by calling getFeedMaker() on the ExpressionCompiler corresponding to the class of expression.
The expression must have been previously marked to indicate which of its inputs is being
supplied in streaming mode.
<P>
<P>
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<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#ItemFeed(net.sf.saxon.expr.Expression, com.saxonica.stream.feed.Feed, java.util.Stack)">ItemFeed</A></B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp,
<A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A> result,
<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>> contextStack)</CODE>
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<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#append(net.sf.saxon.om.Item)">append</A></B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item)</CODE>
<BR>
Supply one item towards the streamed input of the expression</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#close()">close</A></B>()</CODE>
<BR>
Finish evaluating the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#getContext()">getContext</A></B>()</CODE>
<BR>
Get the dynamic evaluation context</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#getContextStack()">getContextStack</A></B>()</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#getExpression()">getExpression</A></B>()</CODE>
<BR>
Get the expression being evaluated by this ItemFeed</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/event/PipelineConfiguration.html" title="class in net.sf.saxon.event">PipelineConfiguration</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#getPipelineConfiguration()">getPipelineConfiguration</A></B>()</CODE>
<BR>
Get the pipeline configuration</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#getResult()">getResult</A></B>()</CODE>
<BR>
Get the result, that is, the ItemFeed to which the items in the result
of the expression should be supplied</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#open()">open</A></B>()</CODE>
<BR>
Start evaluating the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/stream/feed/ItemFeed.html#setPipelineConfiguration(net.sf.saxon.event.PipelineConfiguration)">setPipelineConfiguration</A></B>(<A HREF="../../../../net/sf/saxon/event/PipelineConfiguration.html" title="class in net.sf.saxon.event">PipelineConfiguration</A> pipe)</CODE>
<BR>
Set the pipeline configuration</TD>
</TR>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="ItemFeed(net.sf.saxon.expr.Expression, com.saxonica.stream.feed.Feed, java.util.Stack)"><!-- --></A><H3>
ItemFeed</H3>
<PRE>
public <B>ItemFeed</B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp,
<A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A> result,
<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>> contextStack)</PRE>
<DL>
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<!-- ============ METHOD DETAIL ========== -->
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<A NAME="getExpression()"><!-- --></A><H3>
getExpression</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>getExpression</B>()</PRE>
<DL>
<DD>Get the expression being evaluated by this ItemFeed
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the expression being evaluated</DL>
</DD>
</DL>
<HR>
<A NAME="getResult()"><!-- --></A><H3>
getResult</H3>
<PRE>
public <A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A> <B>getResult</B>()</PRE>
<DL>
<DD>Get the result, that is, the ItemFeed to which the items in the result
of the expression should be supplied
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the ItemFeed that consumes the results of this expression</DL>
</DD>
</DL>
<HR>
<A NAME="setPipelineConfiguration(net.sf.saxon.event.PipelineConfiguration)"><!-- --></A><H3>
setPipelineConfiguration</H3>
<PRE>
public void <B>setPipelineConfiguration</B>(<A HREF="../../../../net/sf/saxon/event/PipelineConfiguration.html" title="class in net.sf.saxon.event">PipelineConfiguration</A> pipe)</PRE>
<DL>
<DD>Set the pipeline configuration
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>pipe</CODE> - the pipeline configuration</DL>
</DD>
</DL>
<HR>
<A NAME="getPipelineConfiguration()"><!-- --></A><H3>
getPipelineConfiguration</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/event/PipelineConfiguration.html" title="class in net.sf.saxon.event">PipelineConfiguration</A> <B>getPipelineConfiguration</B>()</PRE>
<DL>
<DD>Get the pipeline configuration
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html#getPipelineConfiguration()">getPipelineConfiguration</A></CODE> in interface <CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the pipeline configuration</DL>
</DD>
</DL>
<HR>
<A NAME="getContext()"><!-- --></A><H3>
getContext</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> <B>getContext</B>()</PRE>
<DL>
<DD>Get the dynamic evaluation context
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the dynamic evaluation context</DL>
</DD>
</DL>
<HR>
<A NAME="getContextStack()"><!-- --></A><H3>
getContextStack</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>> <B>getContextStack</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="open()"><!-- --></A><H3>
open</H3>
<PRE>
public void <B>open</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Start evaluating the expression. The default implementation does nothing.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html#open()">open</A></CODE> in interface <CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs</DL>
</DD>
</DL>
<HR>
<A NAME="append(net.sf.saxon.om.Item)"><!-- --></A><H3>
append</H3>
<PRE>
public abstract void <B>append</B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Supply one item towards the streamed input of the expression
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html#append(net.sf.saxon.om.Item)">append</A></CODE> in interface <CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>item</CODE> - the item to be supplied
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - to report any failure</DL>
</DD>
</DL>
<HR>
<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Finish evaluating the expression. The default implementation does nothing.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../com/saxonica/stream/feed/Feed.html" title="interface in com.saxonica.stream.feed">Feed</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs</DL>
</DD>
</DL>
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