/*******************************************************************************
 * Copyright (c) 2002, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.core.internal.contentmodel.internal.annotation;
                     
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Locale;
import java.util.ResourceBundle;

import org.eclipse.core.runtime.Platform;


public class ResourceBundleHelper
{
  public static ResourceBundle getResourceBundle(String resourceURI, Locale targetLocale) throws Exception
  {
	  // try to load bundle from the location specified in the resourceURI
    // we make the assumption that the resourceURI points to the local file system
         
    int index = resourceURI.lastIndexOf("/"); //$NON-NLS-1$
    if (index == -1)
    {
      throw new Exception("Invalid resourceURI"); //$NON-NLS-1$
    }                               

    // Below we set 'resourceDirectory' so that it ends with a '/'.
    // Here's an excerpt from the ClassLoader Javadoc ...
    // Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed
    // to refer to a JAR file which will be opened as needed. 
    //
    String resourceDirectory = resourceURI.substring(0, index + 1);
    String resourceBundleName = resourceURI.substring(index + 1);
    
    // create a class loader with a class path that points to the resource bundle's location
    //         
    URL[] classpath = new URL[1];
    classpath[0] = Platform.resolve(new URL(resourceDirectory));
	  ClassLoader resourceLoader = new URLClassLoader(classpath, null); 
       
  	return ResourceBundle.getBundle(resourceBundleName, targetLocale, resourceLoader);
	}  

  public static ResourceBundle getResourceBundle(String resourceURI) throws Exception 
  {
	  return getResourceBundle(resourceURI, Locale.getDefault());
  }
}
