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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.impl;
    18
    19  import org.apache.commons.vfs.FileContent;
    20  import org.apache.commons.vfs.FileObject;
    21  import org.apache.commons.vfs.FileSystemException;
    22
    23  import java.util.HashMap;
    24  import java.util.Map;
    25
    26  /***
    27   * A helper class that determines the provider to use for a file.
    28   *
    29   * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
    30   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
    31   */
    32  class FileTypeMap
    33  {
    34      private final Map mimeTypeMap = new HashMap();
    35      private final Map extensionMap = new HashMap();
    36
    37      /***
    38       * Adds a MIME type mapping.
    39       */
    40      public void addMimeType(final String mimeType, final String scheme)
    41      {
    42          mimeTypeMap.put(mimeType, scheme);
    43      }
    44
    45      /***
    46       * Adds a filename extension mapping.
    47       */
    48      public void addExtension(final String extension, final String scheme)
    49      {
    50          extensionMap.put(extension, scheme);
    51      }
    52
    53      /***
    54       * Finds the provider to use to create a filesystem from a given file.
    55       */
    56      public String getScheme(final FileObject file) throws FileSystemException
    57      {
    58          // Check the file's mime type for a match
    59          final FileContent content = file.getContent();
    60          // final String mimeType = (String) content.getAttribute("content-type");
    61          final String mimeType = content.getContentInfo().getContentType();
    62          if (mimeType != null)
    63          {
    64              return (String) mimeTypeMap.get(mimeType);
    65          }
    66
    67          // Check the file's extension for a match
    68          final String extension = file.getName().getExtension();
    69          return (String) extensionMap.get(extension);
    70      }
    71  }