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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;
    18
    19  import java.lang.reflect.InvocationTargetException;
    20  import java.lang.reflect.Method;
    21
    22  /***
    23   * The main entry point for the VFS.  Used to create {@link FileSystemManager}
    24   * instances.
    25   *
    26   * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
    27   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
    28   */
    29  public class VFS
    30  {
    31      private static Boolean URI_STYLE = null;
    32
    33      private static FileSystemManager instance;
    34
    35      private VFS()
    36      {
    37      }
    38
    39      /***
    40       * Returns the default {@link FileSystemManager} instance
    41       */
    42      public static synchronized FileSystemManager getManager()
    43          throws FileSystemException
    44      {
    45          if (instance == null)
    46          {
    47              instance = createManager("org.apache.commons.vfs.impl.StandardFileSystemManager");
    48          }
    49          return instance;
    50      }
    51
    52      /***
    53       * Creates a file system manager instance.
    54       */
    55      private static FileSystemManager createManager(final String managerClassName)
    56          throws FileSystemException
    57      {
    58          try
    59          {
    60              // Create instance
    61              final Class mgrClass = Class.forName(managerClassName);
    62              final FileSystemManager mgr = (FileSystemManager) mgrClass.newInstance();
    63
    64              /*
    65              try
    66              {
    67                  // Set the logger
    68                  final Method setLogMethod = mgrClass.getMethod("setLogger", new Class[]{Log.class});
    69                  final Log logger = LogFactory.getLog(VFS.class);
    70                  setLogMethod.invoke(mgr, new Object[]{logger});
    71              }
    72              catch (final NoSuchMethodException e)
    73              {
    74                  // Ignore; don't set the logger
    75              }
    76              */
    77
    78              try
    79              {
    80                  // Initialise
    81                  final Method initMethod = mgrClass.getMethod("init", null);
    82                  initMethod.invoke(mgr, null);
    83              }
    84              catch (final NoSuchMethodException e)
    85              {
    86                  // Ignore; don't initialize
    87              }
    88
    89              return mgr;
    90          }
    91          catch (final InvocationTargetException e)
    92          {
    93              throw new FileSystemException("vfs/create-manager.error",
    94                  managerClassName,
    95                  e.getTargetException());
    96          }
    97          catch (final Exception e)
    98          {
    99              throw new FileSystemException("vfs/create-manager.error",
    100                 managerClassName,
    101                 e);
    102         }
    103     }
    104
    105     public static boolean isUriStyle()
    106     {
    107         if (URI_STYLE == null)
    108         {
    109             URI_STYLE = Boolean.FALSE;
    110         }
    111         return URI_STYLE.booleanValue();
    112     }
    113
    114     public static void setUriStyle(boolean uriStyle)
    115     {
    116         if (URI_STYLE != null && URI_STYLE.booleanValue() != uriStyle)
    117         {
    118             throw new IllegalStateException("URI STYLE ALREADY SET TO");
    119         }
    120         URI_STYLE = uriStyle ? Boolean.TRUE : Boolean.FALSE;
    121     }
    122 }