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MultithreadedContextMappingIterator
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com.saxonica.expr.ee</FONT>
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Class MultithreadedContextMappingIterator</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.expr.ee.MultithreadedContextMappingIterator</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public final class <B>MultithreadedContextMappingIterator</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="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></DL>
</PRE>
<P>
This class performs the same role as ContextMappingIterator, but using
multiple threads.
It merges a sequence of sequences into a single flat
sequence. It takes as inputs an iteration, and an "action" expression to be
applied to each Item returned by that iteration, with that item as the context item.
The action expression itself returns another iterator. The result is an iteration of the concatenation of all
the iterations returned by the action expression.<p>
<P>
<P>
<HR>
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<TH ALIGN="left"><B>Fields inherited from interface net.sf.saxon.om.<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#GROUNDED">GROUNDED</A>, <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#LAST_POSITION_FINDER">LAST_POSITION_FINDER</A>, <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#LOOKAHEAD">LOOKAHEAD</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#MultithreadedContextMappingIterator(net.sf.saxon.expr.Expression, net.sf.saxon.expr.XPathContextMinor, int)">MultithreadedContextMappingIterator</A></B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> action,
<A HREF="../../../../net/sf/saxon/expr/XPathContextMinor.html" title="class in net.sf.saxon.expr">XPathContextMinor</A> context,
int threads)</CODE>
<BR>
Construct an Iterator that will apply a specified action expression to
each Item returned by the current iterator of the supplied dynamic context.</TD>
</TR>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#close()">close</A></B>()</CODE>
<BR>
Close the iterator.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#current()">current</A></B>()</CODE>
<BR>
Get the current value in the sequence (the one returned by the
most recent call on next()).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#getAnother()">getAnother</A></B>()</CODE>
<BR>
Get another SequenceIterator that iterates over the same items as the original,
but which is repositioned at the start of the sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#getProperties()">getProperties</A></B>()</CODE>
<BR>
Get properties of this iterator, as a bit-significant integer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#next()">next</A></B>()</CODE>
<BR>
Get the next item in the sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/expr/ee/MultithreadedContextMappingIterator.html#position()">position</A></B>()</CODE>
<BR>
Get the current position.</TD>
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<A NAME="MultithreadedContextMappingIterator(net.sf.saxon.expr.Expression, net.sf.saxon.expr.XPathContextMinor, int)"><!-- --></A><H3>
MultithreadedContextMappingIterator</H3>
<PRE>
public <B>MultithreadedContextMappingIterator</B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> action,
<A HREF="../../../../net/sf/saxon/expr/XPathContextMinor.html" title="class in net.sf.saxon.expr">XPathContextMinor</A> context,
int threads)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Construct an Iterator that will apply a specified action expression to
each Item returned by the current iterator of the supplied dynamic context.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>action</CODE> - the mapping expression to be applied<DD><CODE>context</CODE> - the processing context. The action expression is applied to each item returned
by context.getCurrentIterator() in turn.<DD><CODE>threads</CODE> - the number of threads to be used (in addition to the base evaluation thread)
These threads are used to evaluate the action expression. The current thread is used
to evaluate the base iterator and to gather the results of invoking the action expressions
in the right order.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="next()"><!-- --></A><H3>
next</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> <B>next</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#next()">SequenceIterator</A></CODE></B></DD>
<DD>Get the next item in the sequence. This method changes the state of the
iterator, in particular it affects the result of subsequent calls of
position() and current().
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#next()">next</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the next item, or null if there are no more items. Once a call
on next() has returned null, no further calls should be made. The preferred
action for an iterator if subsequent calls on next() are made is to return
null again, and all implementations within Saxon follow this rule.
<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 an error occurs retrieving the next item</DL>
</DD>
</DL>
<HR>
<A NAME="current()"><!-- --></A><H3>
current</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> <B>current</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#current()">SequenceIterator</A></CODE></B></DD>
<DD>Get the current value in the sequence (the one returned by the
most recent call on next()). This will be null before the first
call of next(). This method does not change the state of the iterator.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#current()">current</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the current item, the one most recently returned by a call on
next(). Returns null if next() has not been called, or if the end
of the sequence has been reached.</DL>
</DD>
</DL>
<HR>
<A NAME="position()"><!-- --></A><H3>
position</H3>
<PRE>
public int <B>position</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#position()">SequenceIterator</A></CODE></B></DD>
<DD>Get the current position. This will usually be zero before the first call
on next(), otherwise it will be the number of times that next() has
been called. Once next() has returned null, the preferred action is
for subsequent calls on position() to return -1, but not all existing
implementations follow this practice. (In particular, the EmptyIterator
is stateless, and always returns 0 as the value of position(), whether
or not next() has been called.)
<p>
This method does not change the state of the iterator.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#position()">position</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the current position, the position of the item returned by the
most recent call of next(). This is 1 after next() has been successfully
called once, 2 after it has been called twice, and so on. If next() has
never been called, the method returns zero. If the end of the sequence
has been reached, the value returned will always be <= 0; the preferred
value is -1.</DL>
</DD>
</DL>
<HR>
<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#close()">SequenceIterator</A></CODE></B></DD>
<DD>Close the iterator. This indicates to the supplier of the data that the client
does not require any more items to be delivered by the iterator. This may enable the
supplier to release resources. After calling close(), no further calls on the
iterator should be made; if further calls are made, the effect of such calls is undefined.
<p>(Currently, closing an iterator is important only when the data is being "pushed" in
another thread. Closing the iterator terminates that thread and means that it needs to do
no additional work. Indeed, failing to close the iterator may cause the push thread to hang
waiting for the buffer to be emptied.)</p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getAnother()"><!-- --></A><H3>
getAnother</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> <B>getAnother</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#getAnother()">SequenceIterator</A></CODE></B></DD>
<DD>Get another SequenceIterator that iterates over the same items as the original,
but which is repositioned at the start of the sequence.
<p>
This method allows access to all the items in the sequence without disturbing the
current position of the iterator. Internally, its main use is in evaluating the last()
function.
<p>
This method does not change the state of the iterator.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#getAnother()">getAnother</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a SequenceIterator that iterates over the same items,
positioned before the first item
<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 any error occurs</DL>
</DD>
</DL>
<HR>
<A NAME="getProperties()"><!-- --></A><H3>
getProperties</H3>
<PRE>
public int <B>getProperties</B>()</PRE>
<DL>
<DD>Get properties of this iterator, as a bit-significant integer.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#getProperties()">getProperties</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the properties of this iterator. This will be some combination of
properties such as <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#GROUNDED"><CODE>SequenceIterator.GROUNDED</CODE></A>, <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#LAST_POSITION_FINDER"><CODE>SequenceIterator.LAST_POSITION_FINDER</CODE></A>,
and <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#LOOKAHEAD"><CODE>SequenceIterator.LOOKAHEAD</CODE></A>. It is always
acceptable to return the value zero, indicating that there are no known special properties.
It is acceptable for the properties of the iterator to change depending on its state.</DL>
</DD>
</DL>
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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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