/*
* 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.filesystem;
// Java 2 standard packages
import java.net.*;
// Third party packages
import org.apache.log4j.Logger;
import org.jrdf.vocabulary.RDF;
// Locally written packages
import org.mulgara.query.rdf.Mulgara;
import org.mulgara.query.rdf.URIReferenceImpl;
import org.mulgara.resolver.spi.*;
/**
* Manages the creation and initialisation of a file system resolver.
*
* @created 2004-11-17
*
* @author Mark Ludlow
*
* @version $Revision: 1.8 $
*
* @modified $Date: 2005/01/05 04:58:27 $ @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 FileSystemResolverFactory implements ResolverFactory {
/** Logger */
private static final Logger logger =
Logger.getLogger(FileSystemResolverFactory.class);
/** The preallocated local node representing the rdf:type property */
private long rdfType;
/** Node id for the file system model type */
private long fileSystemNode;
/** The inclusion predicate node id */
private long includeNode;
/** The exclusion predicate node id */
private long excludeNode;
/**
* The URL associated with the FileSystem type.
*/
private static final URI modelTypeURI = URI.create(Mulgara.NAMESPACE + "FileSystemModel");
/**
* The preallocated local node representing the system model and it's type(<code>#</code>).
*/
private long systemModel;
private long systemModelType;
/**
* Constructor
*
* @param initializer The initialisation object to allow us access to
* resolver initialisation parameters
*
* @throws InitializerException
*/
private FileSystemResolverFactory(ResolverFactoryInitializer initializer)
throws InitializerException {
// Validate parameters
if (initializer == null) {
throw new IllegalArgumentException(
"Null 'resolverFactoryInitializer' parameter");
}
// Set the model type
initializer.getSystemModelType();
// Set the system model and its type
systemModel = initializer.getSystemModel();
systemModelType = initializer.getSystemModelType();
try {
// Retrieve the rdf type predicate
rdfType = initializer.preallocate(new URIReferenceImpl(RDF.TYPE));
// Set the file system type node
fileSystemNode = initializer.preallocate(new URIReferenceImpl(new URI(
"http://mulgara.org/mulgara/filesystem")));
// Define the inclusion node
includeNode = initializer.preallocate(new URIReferenceImpl(new URI(
"http://mulgara.org/mulgara/filesystem#Include")));
// Define the exclusion node
excludeNode = initializer.preallocate(new URIReferenceImpl(new URI(
"http://mulgara.org/mulgara/filesystem#Exclude")));
} catch (URISyntaxException eu) {
throw new InitializerException("Attempt to create invalid uri", eu);
}
// Claim mulgara:FileSystemModel
initializer.addModelType(modelTypeURI, this);
if (logger.isDebugEnabled()) {
logger.debug("Registered FileSystem resolver to handle " + modelTypeURI);
}
}
/**
* {@inheritDoc ResolverFactory}
*
* This is actually a non-operation, because there are no persistent
* resources.
*/
public void close() {
// null implementation
}
/**
* {@inheritDoc ResolverFactory}
*
* This is actually a non-operation, because there are no persistent
* resources.
*/
public void delete() {
// null implementation
}
/**
* {@inheritDoc}
* @return <code>null</code> - no default graphs for this resolver
*/
public Graph[] getDefaultGraphs() { return null; }
/**
* @inheritDoc
* @return <code>true</code> - the graph supports exports.
*/
public boolean supportsExport() {
return true;
}
/**
* Register this resolver upon database startup.
*
* @param initializer the database within which to find or
* create the various XML Schema resources
*
* @throws InitializerException if the XML Schema resources can't be found or
* created
*/
public static ResolverFactory newInstance(
ResolverFactoryInitializer initializer)
throws InitializerException {
return new FileSystemResolverFactory(initializer);
}
/**
* Obtain a FileSystem resolver.
*
* @param resolverSession the session which this query is local to
* @param canWrite {@inheritDoc}; ignored by this implementation
* @param systemResolver The resolver being used for the system model
*
* @throws ResolverFactoryException {@inheritDoc}
*/
public Resolver newResolver(boolean canWrite, ResolverSession resolverSession,
Resolver systemResolver)
throws ResolverFactoryException {
return new FileSystemResolver(resolverSession, systemResolver, rdfType,
systemModel, systemModelType, modelTypeURI,
fileSystemNode, includeNode,
excludeNode);
}
}