| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.vfs2; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| /** |
| * The main entry point for the VFS. Used to create {@link FileSystemManager} |
| * instances. |
| */ |
| public final class VFS |
| { |
| /** The URI style */ |
| private static Boolean uriStyle; |
| |
| /** The FileSystemManager */ |
| private static FileSystemManager instance; |
| |
| private VFS() |
| { |
| } |
| |
| /** |
| * Returns the default {@link FileSystemManager} instance. |
| * <p> |
| * Warning, if you close this instance you may affect all current |
| * and future users of this manager singleton. |
| * |
| * @return The FileSystemManager. |
| * @throws FileSystemException if an error occurs creating the manager. |
| */ |
| public static synchronized FileSystemManager getManager() |
| throws FileSystemException |
| { |
| if (instance == null) |
| { |
| instance = createManager("org.apache.commons.vfs2.impl.StandardFileSystemManager"); |
| } |
| return instance; |
| } |
| |
| /** |
| * Creates a file system manager instance. |
| * @param managerClassName The specific manager impelmentation class name. |
| * @return The FileSystemManager. |
| * @throws FileSystemException if an error occurs creating the manager. |
| */ |
| private static FileSystemManager createManager(final String managerClassName) |
| throws FileSystemException |
| { |
| try |
| { |
| // Create instance |
| final Class<?> mgrClass = Class.forName(managerClassName); |
| final FileSystemManager mgr = (FileSystemManager) mgrClass.newInstance(); |
| |
| try |
| { |
| // Initialize |
| final Method initMethod = mgrClass.getMethod("init", (Class[]) null); |
| initMethod.invoke(mgr, (Object[]) null); |
| } |
| catch (final NoSuchMethodException ignored) |
| { |
| /* Ignore; don't initialize. */ |
| } |
| |
| return mgr; |
| } |
| catch (final InvocationTargetException e) |
| { |
| throw new FileSystemException("vfs/create-manager.error", |
| managerClassName, |
| e.getTargetException()); |
| } |
| catch (final Exception e) |
| { |
| throw new FileSystemException("vfs/create-manager.error", |
| managerClassName, |
| e); |
| } |
| } |
| |
| public static boolean isUriStyle() |
| { |
| if (uriStyle == null) |
| { |
| uriStyle = Boolean.FALSE; |
| } |
| return uriStyle.booleanValue(); |
| } |
| |
| public static void setUriStyle(final boolean uriStyle) |
| { |
| if (VFS.uriStyle != null && VFS.uriStyle.booleanValue() != uriStyle) |
| { |
| throw new IllegalStateException("VFS.uriStyle was already set differently."); |
| } |
| VFS.uriStyle = Boolean.valueOf(uriStyle); |
| } |
| } |