jdk/src/java.base/unix/classes/sun/nio/fs/GnomeFileTypeDetector.java
author bpb
Thu, 06 Aug 2015 12:35:59 -0700
changeset 32042 67cb76150baa
parent 29986 97167d851fc4
child 32095 85de9b55de5b
permissions -rw-r--r--
8129633: (fs) Investigate removing the GNOME-based FileTypeDetector from the Linux and Solaris implementations Summary: Remove the GNOME VFS detector leaving the libgio detector in place. Reviewed-by: chegar
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/*
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 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package sun.nio.fs;
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import java.nio.file.Path;
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import java.io.IOException;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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/**
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 * File type detector that uses the GNOME I/O library to guess the
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 * MIME type of a file.
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 */
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public class GnomeFileTypeDetector
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    extends AbstractFileTypeDetector
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{
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    // true if GIO is available
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    private final boolean gioAvailable;
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    public GnomeFileTypeDetector() {
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        gioAvailable = initializeGio();
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    }
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    @Override
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    public String implProbeContentType(Path obj) throws IOException {
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        if (!gioAvailable)
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            return null;
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        if (!(obj instanceof UnixPath))
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            return null;
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        UnixPath path = (UnixPath)obj;
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        NativeBuffer buffer = NativeBuffers.asNativeBuffer(path.getByteArrayForSysCalls());
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        try {
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            // GIO may access file so need permission check
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            path.checkRead();
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            byte[] type = probeGio(buffer.address());
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            return (type == null) ? null : Util.toString(type);
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        } finally {
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            buffer.release();
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        }
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    }
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    // GIO
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    private static native boolean initializeGio();
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    private static native byte[] probeGio(long pathAddress);
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    static {
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        AccessController.doPrivileged(new PrivilegedAction<>() {
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            public Void run() {
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                System.loadLibrary("nio");
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                return null;
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        }});
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    }
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}