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122 lines
4.5 KiB
122 lines
4.5 KiB
/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. 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 Oracle 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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/*
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* This source code is provided to illustrate the usage of a given feature
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* or technique and has been deliberately simplified. Additional steps
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* required for a production-quality application, such as security checks,
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* input validation and proper error handling, might not be present in
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* this sample code.
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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 store
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FileStore store = Files.getFileStore(file);
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if (!store.supportsFileAttributeView(UserDefinedFileAttributeView.class)) {
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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 =
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Files.getFileAttributeView(file, 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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}
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