001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2011
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.util;
040
041import java.net.URL;
042
043/**
044 * Utility methods to locate resources on the context classloader or
045 * the class loader that loaded the class passed as parameter. 
046 * 
047 * @author Umberto Cappellini <umberto.cappellini@agfa.com>
048 *
049 */
050public class ResourceLocator {
051    
052    public static String resourceURL(String name) {
053        ClassLoader tcl = Thread.currentThread().getContextClassLoader();
054        URL url = tcl.getResource(name);
055        return url != null ? url.toString() : null;
056    }
057    
058    public static String getResource(String resource, Object source) {
059        Class<?> c = source == null ? null : source.getClass();
060        return getResource(resource, c);
061    }
062
063    public static String getResource(String resource, Class<?> c) {
064        URL url = getResourceURL(resource, c);
065        return url != null ? url.toString() : null;
066    }
067
068    public static URL getResourceURL(String resource, Object source) {
069        Class<?> c = source == null ? null : source.getClass();
070        return getResourceURL(resource, c);
071    }
072
073    public static URL getResourceURL(String resource, Class<?> c) {
074        if (c != null) {
075            ClassLoader classLoader = c.getClassLoader();
076            if (classLoader != null) {
077                return classLoader.getResource(resource);
078            }
079        }
080        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
081        if (classLoader != null) {
082            return classLoader.getResource(resource);
083        }
084        return ClassLoader.getSystemResource(resource);
085    }
086
087}