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CollectionURIResolver
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net.sf.saxon.lib</FONT>
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Interface CollectionURIResolver</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DD>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../net/sf/saxon/lib/StandardCollectionURIResolver.html" title="class in net.sf.saxon.lib">StandardCollectionURIResolver</A></DD>
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<DT><PRE>public interface <B>CollectionURIResolver</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DL>
</PRE>
<P>
This interface defines a CollectionURIResolver. This is a counterpart to the JAXP
URIResolver, but is used to map the URI of collection into a sequence of documents.
It is used to support the fn:collection() and fn:uri-collection() functions.
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<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/lib/CollectionURIResolver.html#resolve(java.lang.String, java.lang.String, net.sf.saxon.expr.XPathContext)">resolve</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> href,
<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> base,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
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Resolve a URI.</TD>
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<A NAME="resolve(java.lang.String, java.lang.String, net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
resolve</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> <B>resolve</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> href,
<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> base,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Resolve a URI.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>href</CODE> - The relative URI of the collection. This corresponds to the
argument supplied to the collection() function. If the collection() function
was called with no arguments (to get the "default collection") this argument
will be null.<DD><CODE>base</CODE> - The base URI that should be used. This is the base URI of the
static context in which the call to collection() was made, typically the URI
of the stylesheet or query module<DD><CODE>context</CODE> - The dynamic execution context
<DT><B>Returns:</B><DD>an Iterator over the documents in the collection. The items returned
by this iterator must be instances either of xs:anyURI, or of node() (specifically,
<A HREF="../../../../net/sf/saxon/om/NodeInfo.html" title="interface in net.sf.saxon.om"><CODE>NodeInfo</CODE></A>).
<p>When the fn:uri-collection() function is called: the result will consist of
(a) any items that are xs:anyURI values, and (b) any items that are nodes, provided
that they are document nodes with a document URI.</p>
<p>When the fn:collection() function is called: if xs:anyURI values are returned, the corresponding
document will be retrieved as if by a call to the fn:doc() function: this means that
the system first checks to see if the document is already loaded, and if not, calls
the registered URIResolver to dereference the URI. This is the recommended approach
to ensure that the resulting collection is stable: however, it has the consequence
that the documents will by default remain in memory for the duration of the query
or transformation.</p>
<p>
If the collection URI is not recognized, the method may either return an empty iterator,
in which case no error is reported, or it may throw an exception, in which case
the query or transformation fails. Returning null has the same effect as returning
an empty iterator.</p>
<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 failure occurs</DL>
</DD>
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