View Javadoc

    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  package org.apache.commons.vfs.provider.res;
    18
    19  import org.apache.commons.vfs.Capability;
    20  import org.apache.commons.vfs.FileObject;
    21  import org.apache.commons.vfs.FileSystem;
    22  import org.apache.commons.vfs.FileSystemConfigBuilder;
    23  import org.apache.commons.vfs.FileSystemException;
    24  import org.apache.commons.vfs.FileSystemOptions;
    25  import org.apache.commons.vfs.provider.AbstractFileProvider;
    26  import org.apache.commons.vfs.provider.UriParser;
    27
    28  import java.net.URL;
    29  import java.util.Arrays;
    30  import java.util.Collection;
    31  import java.util.Collections;
    32
    33  /***
    34   * Description
    35   *
    36   * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
    37   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
    38   */
    39  public class ResourceFileProvider extends AbstractFileProvider
    40  {
    41      protected final static Collection capabilities = Collections.unmodifiableCollection(Arrays.asList(new Capability[]
    42      {
    43          Capability.DISPATCHER
    44      }));
    45
    46      public ResourceFileProvider()
    47      {
    48          super();
    49      }
    50
    51      /***
    52       * Locates a file object, by absolute URI.
    53       */
    54      public FileObject findFile(final FileObject baseFile,
    55                                 final String uri,
    56                                 final FileSystemOptions fileSystemOptions)
    57          throws FileSystemException
    58      {
    59          StringBuffer buf = new StringBuffer(80);
    60          UriParser.extractScheme(uri, buf);
    61          String resourceName = buf.toString();
    62
    63          ClassLoader cl = ResourceFileSystemConfigBuilder.getInstance().getClassLoader(fileSystemOptions);
    64          if (cl == null)
    65          {
    66              cl = getClass().getClassLoader();
    67          }
    68          final URL url = cl.getResource(resourceName);
    69
    70          if (url == null)
    71          {
    72              throw new FileSystemException("vfs.provider.url/badly-formed-uri.error", uri);
    73          }
    74
    75          FileObject fo = getContext().getFileSystemManager().resolveFile(url.toExternalForm());
    76          return fo;
    77      }
    78
    79      public FileSystemConfigBuilder getConfigBuilder()
    80      {
    81          return org.apache.commons.vfs.provider.res.ResourceFileSystemConfigBuilder.getInstance();
    82      }
    83
    84      public void closeFileSystem(FileSystem filesystem)
    85      {
    86          // no filesystem created here - so nothing to do
    87      }
    88
    89      public Collection getCapabilities()
    90      {
    91          return capabilities;
    92      }
    93  }