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// 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;
}
}
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