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NamespaceMaintainer
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net.sf.saxon.evpull</FONT>
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Class NamespaceMaintainer</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.evpull.NamespaceMaintainer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A>, <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull">PullEvent</A>, <A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html" title="interface in net.sf.saxon.om">NamespaceResolver</A></DD>
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<DT><PRE>public class <B>NamespaceMaintainer</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/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A>, <A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html" title="interface in net.sf.saxon.om">NamespaceResolver</A></DL>
</PRE>
<P>
NamespaceMaintainer is an EventIterator responsible for maintaining namespace context in an
event stream. It allows the current namespace context to be determined at any time while
processing the stream of events.
<p>Note that this class merely provides the service of keeping track of which namespaces are
currently in scope. It does not attempt to remove duplicate namespace declarations, and it does
not perform namespace fixup.</p>
<P>
<P>
<HR>
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<TD><CODE><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html#NamespaceMaintainer(net.sf.saxon.evpull.EventIterator)">NamespaceMaintainer</A></B>(<A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A> base)</CODE>
<BR>
Create a namespace context for a pull-events pipeline</TD>
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<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html#getURIForPrefix(java.lang.String, boolean)">getURIForPrefix</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> prefix,
boolean useDefault)</CODE>
<BR>
Get the namespace URI corresponding to a given prefix.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html#isFlatSequence()">isFlatSequence</A></B>()</CODE>
<BR>
Determine whether the EventIterator returns a flat sequence of events, or whether it can return
nested event iterators</TD>
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<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/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html#iteratePrefixes()">iteratePrefixes</A></B>()</CODE>
<BR>
Get an iterator over all the prefixes declared in this namespace context.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull">PullEvent</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html#next()">next</A></B>()</CODE>
<BR>
Get the next event in the sequence</TD>
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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>
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<A NAME="NamespaceMaintainer(net.sf.saxon.evpull.EventIterator)"><!-- --></A><H3>
NamespaceMaintainer</H3>
<PRE>
public <B>NamespaceMaintainer</B>(<A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A> base)</PRE>
<DL>
<DD>Create a namespace context for a pull-events pipeline
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>base</CODE> - the previous stage in the pipeline, from which events are read</DL>
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<A NAME="isFlatSequence()"><!-- --></A><H3>
isFlatSequence</H3>
<PRE>
public boolean <B>isFlatSequence</B>()</PRE>
<DL>
<DD>Determine whether the EventIterator returns a flat sequence of events, or whether it can return
nested event iterators
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html#isFlatSequence()">isFlatSequence</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if the next() method is guaranteed never to return an EventIterator</DL>
</DD>
</DL>
<HR>
<A NAME="next()"><!-- --></A><H3>
next</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull">PullEvent</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 event in the sequence
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html#next()">next</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the next event, or null when the sequence is exhausted. Note that since an EventIterator is
itself a PullEvent, this method may return a nested iterator.
<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 evaluation error occurs</DL>
</DD>
</DL>
<HR>
<A NAME="getURIForPrefix(java.lang.String, boolean)"><!-- --></A><H3>
getURIForPrefix</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getURIForPrefix</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> prefix,
boolean useDefault)</PRE>
<DL>
<DD>Get the namespace URI corresponding to a given prefix. Return null
if the prefix is not in scope.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html#getURIForPrefix(java.lang.String, boolean)">getURIForPrefix</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html" title="interface in net.sf.saxon.om">NamespaceResolver</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>prefix</CODE> - the namespace prefix<DD><CODE>useDefault</CODE> - true if the default namespace is to be used when the
prefix is ""
<DT><B>Returns:</B><DD>the uri for the namespace, or null if the prefix is not in scope</DL>
</DD>
</DL>
<HR>
<A NAME="iteratePrefixes()"><!-- --></A><H3>
iteratePrefixes</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A> <B>iteratePrefixes</B>()</PRE>
<DL>
<DD>Get an iterator over all the prefixes declared in this namespace context. This will include
the default namespace (prefix="") and the XML namespace where appropriate
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html#iteratePrefixes()">iteratePrefixes</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/om/NamespaceResolver.html" title="interface in net.sf.saxon.om">NamespaceResolver</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an iterator over all the prefixes for which a namespace binding exists, including
the zero-length string to represent the null/absent prefix if it is bound</DL>
</DD>
</DL>
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