/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.management;
import java.io.File;
import java.io.IOException;
/*
* Utility class to support file system operations
*
* @since 1.5
*/
public abstract class FileSystem {
private static final Object lock = new Object();
private static FileSystem fs;
protected FileSystem() { }
/**
* Opens the file system
*/
public static FileSystem open() {
synchronized (lock) {
if (fs == null) {
fs = new FileSystemImpl();
}
return fs;
}
}
/**
* Tells whether or not the specified file is located on a
* file system that supports file security or not.
*
* @throws IOException if an I/O error occurs.
*/
public abstract boolean supportsFileSecurity(File f) throws IOException;
/**
* Tell whether or not the specified file is accessible
* by anything other than the file owner.
*
* @throws IOException if an I/O error occurs.
*
* @throws UnsupportedOperationException
* If file is located on a file system that doesn't support
* file security.
*/
public abstract boolean isAccessUserOnly(File f) throws IOException;
}