package net.sf.saxon.dotnet;
import cli.System.IO.Stream;
import cli.System.IO.TextReader;
import cli.System.Type;
import cli.System.Uri;
import cli.System.Xml.XmlResolver;
import net.sf.saxon.query.ModuleURIResolver;
import net.sf.saxon.trans.XPathException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamSource;
/**
* This class is the standard ModuleURIResolver used to implement the "import module" declaration
* in a Query Prolog. It is used when no user-defined ModuleURIResolver has been specified, or when
* the user-defined ModuleURIResolver decides to delegate to the standard ModuleURIResolver.
* @author Michael H. Kay
*/
public class DotNetStandardModuleURIResolver implements ModuleURIResolver {
private transient XmlResolver resolver;
public DotNetStandardModuleURIResolver() {}
public DotNetStandardModuleURIResolver(XmlResolver resolver) {
this.resolver = resolver;
}
/**
* Resolve a module URI and associated location hints.
* @param moduleURI The module namespace URI of the module to be imported; or null when
* loading a non-library module.
* @param baseURI The base URI of the module containing the "import module" declaration;
* null if no base URI is known
* @param locations The set of URIs specified in the "at" clause of "import module",
* which serve as location hints for the module
* @return an array of StreamSource objects each identifying the contents of a module to be
* imported. Each StreamSource must contain a
* non-null absolute System ID which will be used as the base URI of the imported module,
* and either an InputSource or a Reader representing the text of the module. The method
* may also return null, in which case the system attempts to resolve the URI using the
* standard module URI resolver.
* @throws net.sf.saxon.trans.XPathException if the module cannot be located
*/
public StreamSource[] resolve(String moduleURI, String baseURI, String[] locations) throws XPathException {
if (locations.length == 0) {
XPathException err = new XPathException("Cannot locate module for namespace " + moduleURI);
err.setErrorCode("XQST0059");
err.setIsStaticError(true);
throw err;
} else {
// One or more locations given: import modules from all these locations
Uri base = new Uri(baseURI);
StreamSource[] sources = new StreamSource[locations.length];
for (int m=0; m<locations.length; m++) {
String href = locations[m];
Uri absoluteURI;
try {
absoluteURI = resolver.ResolveUri(base, href);
} catch (Throwable err) {
XPathException se = new XPathException("Cannot resolve relative URI " + href, err);
se.setErrorCode("XQST0059");
se.setIsStaticError(true);
throw se;
}
sources[m] = getQuerySource(absoluteURI);
}
return sources;
}
}
/**
* Get a StreamSource object representing the source of a query, given its URI.
* If the encoding can be determined, it returns a StreamSource containing a Reader that
* performs the required decoding. Otherwise, it returns a StreamSource containing an
* InputSource, leaving the caller to sort out encoding problems.
* @param abs the absolute URI of the source query
* @return a StreamSource containing a Reader or InputSource, as well as a systemID representing
* the base URI of the query.
* @throws XPathException if the URIs are invalid or cannot be resolved or dereferenced, or
* if any I/O error occurs
*/
private StreamSource getQuerySource(Uri abs)
throws XPathException {
try {
Object obj = resolver.GetEntity(abs, "application/xquery", Type.GetType("System.IO.Stream"));
// expect cli.System.IO.FileNotFoundException if this fails
if (obj instanceof Stream) {
StreamSource source = new StreamSource(new DotNetInputStream((Stream)obj));
source.setSystemId(abs.toString());
return source;
} else if (obj instanceof TextReader) {
StreamSource source = new StreamSource(new DotNetReader((TextReader)obj));
source.setSystemId(abs.toString());
return source;
} else if (obj instanceof StreamSource) {
return ((StreamSource)obj);
} else {
throw new TransformerException(
"Unrecognized object returned by XmlResolver (type " + obj.getClass().getName());
}
} catch (Throwable e) {
throw new XPathException(e.getMessage(), e);
}
// TODO: look for the encoding in the HTTP header if any
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//