author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 3065 | 452aaa2899fc |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* - Neither the name of Sun Microsystems nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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import java.nio.ByteBuffer; |
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import java.nio.charset.Charset; |
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import java.nio.file.*; |
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import java.nio.file.attribute.*; |
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import java.io.IOException; |
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/** |
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* Example code to list/set/get/delete the user-defined attributes of a file. |
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*/ |
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public class Xdd { |
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static void usage() { |
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System.out.println("Usage: java Xdd <file>"); |
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System.out.println(" java Xdd -set <name>=<value> <file>"); |
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System.out.println(" java Xdd -get <name> <file>"); |
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System.out.println(" java Xdd -del <name> <file>"); |
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System.exit(-1); |
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} |
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public static void main(String[] args) throws IOException { |
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// one or three parameters |
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if (args.length != 1 && args.length != 3) |
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usage(); |
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Path file = (args.length == 1) ? |
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Paths.get(args[0]) : Paths.get(args[2]); |
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// check that user defined attributes are supported by the file system |
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FileStore store = file.getFileStore(); |
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if (!store.supportsFileAttributeView("xattr")) { |
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System.err.format("UserDefinedFileAttributeView not supported on %s\n", store); |
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System.exit(-1); |
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} |
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UserDefinedFileAttributeView view = file. |
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getFileAttributeView(UserDefinedFileAttributeView.class); |
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// list user defined attributes |
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if (args.length == 1) { |
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System.out.println(" Size Name"); |
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System.out.println("-------- --------------------------------------"); |
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for (String name: view.list()) { |
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System.out.format("%8d %s\n", view.size(name), name); |
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} |
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return; |
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} |
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// Add/replace a file's user defined attribute |
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if (args[0].equals("-set")) { |
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// name=value |
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String[] s = args[1].split("="); |
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if (s.length != 2) |
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usage(); |
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String name = s[0]; |
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String value = s[1]; |
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view.write(name, Charset.defaultCharset().encode(value)); |
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return; |
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} |
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// Print out the value of a file's user defined attribute |
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if (args[0].equals("-get")) { |
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String name = args[1]; |
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int size = view.size(name); |
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ByteBuffer buf = ByteBuffer.allocateDirect(size); |
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view.read(name, buf); |
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buf.flip(); |
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System.out.println(Charset.defaultCharset().decode(buf).toString()); |
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return; |
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} |
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// Delete a file's user defined attribute |
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if (args[0].equals("-del")) { |
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view.delete(args[1]); |
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return; |
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} |
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// option not recognized |
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usage(); |
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} |
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} |