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FilterIterator
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net.sf.saxon.expr</FONT>
<BR>
Class FilterIterator</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>net.sf.saxon.expr.FilterIterator</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>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../net/sf/saxon/expr/FilterIterator.NonNumeric.html" title="class in net.sf.saxon.expr">FilterIterator.NonNumeric</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>FilterIterator</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>
A CompiledFilterIterator filters an input sequence using a filter expression. Note that a CompiledFilterIterator
is not used where the filter is a constant number (PositionFilter is used for this purpose instead),
so this class does no optimizations for numeric predicates.
<P>
<P>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
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<CODE>static class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/expr/FilterIterator.NonNumeric.html" title="class in net.sf.saxon.expr">FilterIterator.NonNumeric</A></B></CODE>
<BR>
Subclass to handle the common special case where it is statically known
that the filter cannot return a numeric value</TD>
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <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="../../../../net/sf/saxon/expr/FilterIterator.html#base">base</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <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="../../../../net/sf/saxon/expr/FilterIterator.html#filter">filter</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <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="../../../../net/sf/saxon/expr/FilterIterator.html#filterContext">filterContext</A></B></CODE>
<BR>
</TD>
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<A NAME="fields_inherited_from_class_net.sf.saxon.om.SequenceIterator"><!-- --></A>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<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="../../../../net/sf/saxon/expr/FilterIterator.html#FilterIterator(net.sf.saxon.om.SequenceIterator, net.sf.saxon.expr.Expression, net.sf.saxon.expr.XPathContext)">FilterIterator</A></B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> base,
<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> filter,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
<BR>
Constructor</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/expr/FilterIterator.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="../../../../net/sf/saxon/expr/FilterIterator.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="../../../../net/sf/saxon/expr/FilterIterator.html#getAnother()">getAnother</A></B>()</CODE>
<BR>
Get another iterator to return the same nodes</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <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="../../../../net/sf/saxon/expr/FilterIterator.html#getNextMatchingItem()">getNextMatchingItem</A></B>()</CODE>
<BR>
Get the next item in the base sequence that matches the filter predicate
if there is such an item, or null if not.</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="../../../../net/sf/saxon/expr/FilterIterator.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>protected boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/expr/FilterIterator.html#matches()">matches</A></B>()</CODE>
<BR>
Determine whether the context item matches the filter predicate</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="../../../../net/sf/saxon/expr/FilterIterator.html#next()">next</A></B>()</CODE>
<BR>
Get the next item if there is one</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="../../../../net/sf/saxon/expr/FilterIterator.html#position()">position</A></B>()</CODE>
<BR>
Get the current position.</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="../../../../net/sf/saxon/expr/FilterIterator.html#setSequence(net.sf.saxon.om.SequenceIterator, net.sf.saxon.expr.XPathContext)">setSequence</A></B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> base,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
<BR>
Set the base iterator</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<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>
</TR>
</TABLE>
<P>
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<A NAME="base"><!-- --></A><H3>
base</H3>
<PRE>
protected <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> <B>base</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="filter"><!-- --></A><H3>
filter</H3>
<PRE>
protected <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>filter</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="filterContext"><!-- --></A><H3>
filterContext</H3>
<PRE>
protected <A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> <B>filterContext</B></PRE>
<DL>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="FilterIterator(net.sf.saxon.om.SequenceIterator, net.sf.saxon.expr.Expression, net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
FilterIterator</H3>
<PRE>
public <B>FilterIterator</B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> base,
<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> filter,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</PRE>
<DL>
<DD>Constructor
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>base</CODE> - An iteration of the items to be filtered<DD><CODE>filter</CODE> - The expression defining the filter predicate<DD><CODE>context</CODE> - The context in which the expression is being evaluated</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Method Detail</B></FONT></TH>
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<A NAME="setSequence(net.sf.saxon.om.SequenceIterator, net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
setSequence</H3>
<PRE>
public void <B>setSequence</B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> base,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</PRE>
<DL>
<DD>Set the base iterator
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>base</CODE> - the iterator over the sequence to be filtered<DD><CODE>context</CODE> - the context in which the (outer) filter expression is evaluated</DL>
</DD>
</DL>
<HR>
<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>Get the next item if there is one
<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="getNextMatchingItem()"><!-- --></A><H3>
getNextMatchingItem</H3>
<PRE>
protected <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> <B>getNextMatchingItem</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Get the next item in the base sequence that matches the filter predicate
if there is such an item, or null if not.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the next item that matches the predicate
<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>
</DD>
</DL>
<HR>
<A NAME="matches()"><!-- --></A><H3>
matches</H3>
<PRE>
protected boolean <B>matches</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Determine whether the context item matches the filter predicate
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if the context item matches
<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>
</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>Get another iterator to return the same nodes
<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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