Package org.olat.core.util.vfs.util

Source Code of org.olat.core.util.vfs.util.VFSUtil

/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) 1999-2006 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/

package org.olat.core.util.vfs.util;

import org.olat.core.gui.media.ClasspathMediaResource;
import org.olat.core.util.vfs.StreamedImpl;
import org.olat.core.util.vfs.VFSContainer;
import org.olat.core.util.vfs.VFSLeaf;

/**
* Initial Date: 17.01.2006
*
* @author Felix Jost
*
* Description:
* some utils for the VFS
*/
public class VFSUtil {
 
 
  /**
   * calculates a new vfscontainer and a filename where the container's base is where the file resides.<br>
   * e.g.<br>
   * container: /usr/local/olat/courses/123/coursefolder and filename: docs/bla/blu.doc<br>
   * -> container /usr/local/olat/courses/123/coursefolder/docs/bla and filename: blu.doc
   *
   * @param oldRoot
   * @param fileName
   * @return
   */
  public static ContainerAndFile calculateSubRoot(VFSContainer oldRoot, String fileUri) {
    VFSContainer newC;
    String newFile;
    int sla = fileUri.lastIndexOf('/');
    if (sla != -1) {
      String root = fileUri.substring(0,sla);
      newFile = fileUri.substring(sla+1);
      newC = (VFSContainer)oldRoot.resolve(root);
    } else {
      newC = oldRoot;
      newFile = fileUri;
    }   
    return new ContainerAndFile(newC, newFile);
  }
 
  /**
   * Creates a VFS leaf for a file that is somewhere in the classpath.
   * @param clazz The classpath that is used as a base
   * @param file The filepath relative to the classpath
   * @return a VFS leaf for the given file
   */
  public static VFSLeaf createLeafFromClasspath(Class clazz, String file) {
    ClasspathMediaResource cmr = new ClasspathMediaResource(clazz, file);
    StreamedImpl si = new StreamedImpl("vfs-from-classpath", null, cmr.getInputStream());   
    return si;
  }

}
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