| // Copyright 2014 The Bazel Authors. All rights reserved. |
| // |
| // Licensed 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 com.google.devtools.build.lib.vfs; |
| |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe; |
| |
| /** |
| * This static file system singleton manages access to a single default |
| * {@link FileSystem} instance created within the methods of this class. |
| */ |
| @ThreadSafe |
| @Deprecated // Instantiate and inject FileSystem instances directly, or use |
| // com.google.devtools.build.lib.vfs.util.FileSystems in tests. |
| public final class FileSystems { |
| |
| private FileSystems() {} |
| |
| private static FileSystem defaultFileSystem; |
| |
| /** |
| * Initializes the default {@link FileSystem} instance as a platform native |
| * (Unix) file system, creating one iff needed, and returns the instance. |
| * |
| * <p>This method is idempotent as long as the initialization is of the same |
| * type (Native/JavaIo/Union). |
| */ |
| public static synchronized FileSystem initDefaultAsNative() { |
| if (!(defaultFileSystem instanceof UnixFileSystem)) { |
| defaultFileSystem = new UnixFileSystem(); |
| } |
| return defaultFileSystem; |
| } |
| |
| /** |
| * Initializes the default {@link FileSystem} instance as a java.io.File |
| * file system, creating one iff needed, and returns the instance. |
| * |
| * <p>This method is idempotent as long as the initialization is of the same |
| * type (Native/JavaIo/Union). |
| */ |
| public static synchronized FileSystem initDefaultAsJavaIo() { |
| if (!(defaultFileSystem instanceof JavaIoFileSystem)) { |
| defaultFileSystem = new JavaIoFileSystem(); |
| } |
| return defaultFileSystem; |
| } |
| } |