/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (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 the Kowari Metadata Store.
*
* The Initial Developer of the Original Code is Plugged In Software Pty
* Ltd (http://www.pisoftware.com, mailto:info@pisoftware.com). Portions
* created by Plugged In Software Pty Ltd are Copyright (C) 2001,2002
* Plugged In Software Pty Ltd. All Rights Reserved.
*
* Contributor(s): N/A.
*
* [NOTE: The text of this Exhibit A may differ slightly from the text
* of the notices in the Source Code files of the Original Code. You
* should use the text of this Exhibit A rather than the text found in the
* Original Code Source Code for Your Modifications.]
*
*/
package org.mulgara.resolver.http;
// Java 2 standard packages
import java.net.*;
// Third party packages
import org.apache.log4j.Logger;
import org.jrdf.graph.Node;
import org.jrdf.graph.URIReference;
// Locally written packages
import org.mulgara.content.Content;
import org.mulgara.content.ContentHandler;
import org.mulgara.content.ContentHandlerManager;
import org.mulgara.content.ContentResolver;
import org.mulgara.resolver.spi.*;
/**
* Resolves constraints in models defined by Http URLs.
*
* @created 2004-09-23
*
* @author Mark Ludlow
*
* @version $Revision: 1.8 $
*
* @modified $Date: 2005/01/05 04:58:45 $ @maintenanceAuthor $Author: newmana $
*
* @company <a href="mailto:info@PIsoftware.com">Plugged In Software</a>
*
* @copyright © 2004 <a href="http://www.PIsoftware.com/">Plugged In
* Software Pty Ltd</a>
*
* @licence <a href="{@docRoot}/../../LICENCE">Mozilla Public License v1.1</a>
*/
public class HttpResolver extends ContentResolver {
/**
* Logger.
*/
@SuppressWarnings("unused")
private static final Logger logger = Logger.getLogger(HttpResolver.class.getName());
/**
* Construct a resolver.
*
* @param resolverSession the session this resolver is associated with
* @param contentHandlers the available {@link ContentHandler}s
* @throws IllegalArgumentException if <var>resolverSession</var> is
* <code>null</code>
*/
HttpResolver(ResolverSession resolverSession,
Resolver systemResolver,
ContentHandlerManager contentHandlers) {
super(resolverSession, systemResolver, contentHandlers);
}
//
// Methods implementing ContentResolver
//
/**
* Convert a local node number representing a <code>http:</code> model into
* {@link HttpContent}.
*
* @param model the local node number of a <code>http:</code> URL
* @throws ResolverException if the <var>model</var> doesn't correspond to a
* {@link URL} with the <code>http:</code> protocol.
*/
protected Content toContent(long model) throws ResolverException {
// Container for our model's URI
URI modelURI;
// Container for our globalised node
Node globalModel = null;
try {
// Globalise the model
globalModel = resolverSession.globalize(model);
} catch (GlobalizeException e) {
throw new ResolverException("Couldn't globalize http model", e);
}
if (!(globalModel instanceof URIReference)) {
// Check that our node is a URIReference
throw new ResolverException("Graph parameter " + globalModel + " isn't a URI reference");
}
// Get the URI from the globalised node
modelURI = ((URIReference) globalModel).getURI();
assert modelURI != null;
// Validate the URI
if (!modelURI.getScheme().toLowerCase().startsWith("http")) {
throw new ResolverException(modelURI + " doesn't use the http(s): scheme");
}
// Container for our URL
URL modelURL = null;
try {
// Convert the URI to a URL
modelURL = modelURI.toURL();
} catch (MalformedURLException malformedURLException) {
throw new ResolverException(
"Failed to convert the model's URI to a valid URL [" +
modelURI +"]", malformedURLException);
}
try {
return new HttpContent(modelURL);
} catch (URISyntaxException e) {
throw new ResolverException("Couldn't create HttpContent from " + modelURL, e);
}
}
}