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    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;
    18
    19  import org.apache.commons.vfs.FileObject;
    20  import org.apache.commons.vfs.FileSystemException;
    21  import org.apache.commons.vfs.FileSystemOptions;
    22
    23  /***
    24   * Description
    25   *
    26   * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
    27   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
    28   */
    29  public abstract class CompositeFileProvider extends AbstractFileProvider
    30  {
    31      public CompositeFileProvider()
    32      {
    33          super();
    34      }
    35
    36      /***
    37       * The schemes to use for resolve
    38       */
    39      protected abstract String[] getSchemes();
    40
    41      /***
    42       * Locates a file object, by absolute URI.
    43       */
    44      public FileObject findFile(final FileObject baseFile,
    45                                 final String uri,
    46                                 final FileSystemOptions fileSystemOptions)
    47          throws FileSystemException
    48      {
    49          StringBuffer buf = new StringBuffer(80);
    50
    51          UriParser.extractScheme(uri, buf);
    52
    53          String[] schemes = getSchemes();
    54          for (int iterSchemes = 0; iterSchemes < schemes.length; iterSchemes++)
    55          {
    56              buf.insert(0, ":");
    57              buf.insert(0, schemes[iterSchemes]);
    58          }
    59
    60          FileObject fo = getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
    61          return fo;
    62      }
    63  }