| // 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.util; |
| |
| import com.google.common.base.Verify; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe; |
| import com.google.devtools.build.lib.testutil.TestConstants; |
| import com.google.devtools.build.lib.unix.UnixFileSystem; |
| import com.google.devtools.build.lib.util.OS; |
| import com.google.devtools.build.lib.vfs.DigestHashFunction; |
| import com.google.devtools.build.lib.vfs.FileSystem; |
| import com.google.devtools.build.lib.vfs.JavaIoFileSystem; |
| import com.google.devtools.build.lib.windows.WindowsFileSystem; |
| |
| /** |
| * This static file system singleton manages access to a single default |
| * {@link FileSystem} instance created within the methods of this class. |
| */ |
| @ThreadSafe |
| public final class FileSystems { |
| |
| private FileSystems() {} |
| |
| private static FileSystem defaultNativeFileSystem; |
| private static FileSystem defaultJavaIoFileSystem; |
| |
| /** |
| * Initializes the default native {@link FileSystem} instance as a platform native |
| * (Unix or Windows) file system. If it's not initialized, then initialize it, |
| * otherwise verify if the type of the instance is correct. |
| */ |
| public static synchronized FileSystem getNativeFileSystem() { |
| if (OS.getCurrent() == OS.WINDOWS) { |
| if (defaultNativeFileSystem == null) { |
| defaultNativeFileSystem = new WindowsFileSystem(DigestHashFunction.DEFAULT_HASH_FOR_TESTS); |
| } else { |
| Verify.verify(defaultNativeFileSystem instanceof WindowsFileSystem); |
| } |
| } else { |
| if (defaultNativeFileSystem == null) { |
| try { |
| defaultNativeFileSystem = |
| (FileSystem) |
| Class.forName(TestConstants.TEST_REAL_UNIX_FILE_SYSTEM) |
| .getDeclaredConstructor(DigestHashFunction.class) |
| .newInstance(DigestHashFunction.DEFAULT_HASH_FOR_TESTS); |
| } catch (Exception e) { |
| throw new IllegalStateException(e); |
| } |
| } else { |
| Verify.verify(defaultNativeFileSystem instanceof UnixFileSystem); |
| } |
| } |
| return defaultNativeFileSystem; |
| } |
| |
| /** |
| * Initializes the default java {@link FileSystem} instance as a java.io.File |
| * file system. If it's not initialized, then initialize it, |
| * otherwise verify if the type of the instance is correct. |
| */ |
| public static synchronized FileSystem getJavaIoFileSystem() { |
| if (defaultJavaIoFileSystem == null) { |
| defaultJavaIoFileSystem = new JavaIoFileSystem(DigestHashFunction.DEFAULT_HASH_FOR_TESTS); |
| } else { |
| Verify.verify(defaultJavaIoFileSystem instanceof JavaIoFileSystem); |
| } |
| return defaultJavaIoFileSystem; |
| } |
| } |