/*
* 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.demo.mp3;
// Java 2 standard packages
import java.net.*;
// Logging
import org.apache.log4j.Logger;
// Third party packages
//JRDF
import org.jrdf.util.ClosableIterator;
import org.jrdf.graph.Triple;
import org.jrdf.graph.URIReference;
import org.jrdf.graph.PredicateNode;
import org.jrdf.graph.ObjectNode;
// Locally written packages
import org.mulgara.query.QueryException;
import org.mulgara.query.rdf.URIReferenceImpl;
/**
* Methods for querying/managing metadata for files in the filesystem.
*
* @created 2004-12-03
*
* @author <a href="mailto:robert.turner@tucanatech.com">Robert Turner</a>
*
* @version $Revision: 1.3 $
*
* @modified $Date: 2005/01/05 04:58:06 $
*
* @maintenanceAuthor $Author: newmana $
*
* @company <A href="mailto:info@PIsoftware.com">Plugged In Software</A>
*
* @copyright ©2001 <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 FileSystemModelImpl extends AbstractModel implements
FileSystemModel {
/**
* Logger. This is named after the class.
*/
private final static Logger log = Logger.getLogger(SchemaModelImpl.class.
getName());
/**
* Adds the directory to the list of directories to search.
*
* @param directory URL
* @throws QueryException
*/
public void includeDirectory(URL directory) throws QueryException {
if (directory == null) {
throw new IllegalArgumentException("'directory' is null");
}
try {
//insert the inclusion and delete the exclusion (if it exists)
String includeQuery = getInsertQuery(getIncludeStatement(directory));
String excludeQuery = getDeleteQuery(getExcludeStatement(directory));
getBean().executeUpdate(includeQuery);
getBean().execute(excludeQuery);
}
catch (Exception exception) {
throw new QueryException("Failed to include directory: " + directory,
exception);
}
}
/**
* Removes the directory from the list of directories to search.
*
* @param directory URL
* @throws QueryException
*/
public void excludeDirectory(URL directory) throws QueryException {
if (directory == null) {
throw new IllegalArgumentException("'directory' is null");
}
try {
//insert the exclusion and delete the inclusion (if it exists)
String excludeQuery = getInsertQuery(getExcludeStatement(directory));
String includeQuery = getDeleteQuery(getIncludeStatement(directory));
getBean().executeUpdate(includeQuery);
getBean().execute(excludeQuery);
}
catch (Exception exception) {
throw new QueryException("Failed to include directory: " + directory,
exception);
}
}
/**
* Returns an Iterator containing all the Files (as URIReferenece's) that have
* the specified metadata property/value.
*
* @param property PredicateNode metadata predicate (eg. "mulgara:extension")
* @param value ObjectNode metadata object (eg. "mp3")
* @return ClosableIterator
* @throws QueryException
*/
public ClosableIterator<Triple> findFiles(PredicateNode property,
ObjectNode value) throws QueryException {
if (property == null) {
throw new IllegalArgumentException("PredicateNode is null");
}
if (value == null) {
throw new IllegalArgumentException("ObjectNode is null");
}
try {
String query = getFindFilesQuery((URIReference) property, value);
return query(query);
}
catch (Exception exception) {
throw new QueryException("Failed to determine domain properties.",
exception);
}
}
/**
* Returns a query in the following format:
* <p><pre>
* select $s $p $o
* from <getResource()>
* where $s $p $o
* and $p <mulgara:is> <property>
* and $o <mulgara:is> 'object' ;
* </pre>
* ('object' will be replaced with <object> for resource objects)
*
*
* @param predicate URIReference
* @param object ObjectNode
* @return String
*/
private String getFindFilesQuery(URIReference predicate, ObjectNode object) {
StringBuffer query = new StringBuffer();
query.append("select $s $p $o " + NEWLINE);
query.append("from <" + getResource() + "> " + NEWLINE);
query.append("where $s $p $o " + NEWLINE);
query.append("and $p " + MULGARA_IS + " <" + predicate.getURI() + "> " +
NEWLINE);
query.append("and $o " + MULGARA_IS + asString(object) + " ;" + NEWLINE);
return query.toString();
}
/**
* Returns a statement in the following format:
* <p><pre>
* <getResource()> <mulgara:include> <directory>
* </pre>
*
* @param directory URL
* @return String
*/
private String getIncludeStatement(URL directory) {
return "<" + getResource().getURI() + ">" + MULGARA_INCLUDE +
" <" + directory + "> ";
}
/**
* Returns a statement in the following format:
* <p><pre>
* <getResource()> <mulgara:exclude> <directory>
* </pre>
*
* @param directory URL
* @return String
*/
private String getExcludeStatement(URL directory) {
return "<" + getResource().getURI() + ">" + MULGARA_EXCLUDE +
" <" + directory + "> ";
}
/**
* Returns a query in the following format:
*
* <p><pre>
* insert *statement*
* into <getResource()> ;
* </pre>
*
* @param statement String
* @return String
* @throws URISyntaxException
*/
private String getInsertQuery(String statement) throws URISyntaxException {
StringBuffer query = new StringBuffer();
query.append("insert " + statement + NEWLINE);
query.append("into <" + getDefinition().getURI() + "> ;");
return query.toString();
}
/**
* Returns a query in the following format:
*
* <p><pre>
* delete *statement*
* from <getResource()> ;
* </pre>
*
* @param statement String
* @return String
* @throws URISyntaxException
*/
private String getDeleteQuery(String statement) throws URISyntaxException {
StringBuffer query = new StringBuffer();
query.append("delete " + statement + NEWLINE);
query.append("from <" + getDefinition().getURI() + "> ;");
return query.toString();
}
/**
* Returns a Resource representing the Definition Graph Resource
*
* @return URIReference
* @throws URISyntaxException
*/
private URIReference getDefinition() throws URISyntaxException {
URIReference resource = getResource();
URI resourceURI = resource.getURI();
URI definitionURI = new URI(resourceURI.getScheme(),
resourceURI.getAuthority(), resourceURI.getPath(), "def",
resourceURI.getFragment());
if (log.isDebugEnabled()) {
log.debug("Returning definition: " + definitionURI + " for " +
resourceURI);
}
return new URIReferenceImpl(definitionURI);
}
}