104 lines
3.4 KiB
Java
104 lines
3.4 KiB
Java
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/*
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* Copyright (c) 2008, 2011, 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.ByteBuffer;
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import java.nio.file.attribute.UserDefinedFileAttributeView;
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import java.io.IOException;
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import java.util.*;
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/**
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* Base implementation of UserDefinedAttributeView
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*/
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abstract class AbstractUserDefinedFileAttributeView
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implements UserDefinedFileAttributeView, DynamicFileAttributeView
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{
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protected AbstractUserDefinedFileAttributeView() { }
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protected void checkAccess(String file,
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boolean checkRead,
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boolean checkWrite)
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{
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assert checkRead || checkWrite;
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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if (checkRead)
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sm.checkRead(file);
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if (checkWrite)
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sm.checkWrite(file);
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sm.checkPermission(new RuntimePermission("accessUserDefinedAttributes"));
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}
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}
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@Override
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public final String name() {
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return "user";
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}
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@Override
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public final void setAttribute(String attribute, Object value)
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throws IOException
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{
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ByteBuffer bb;
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if (value instanceof byte[]) {
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bb = ByteBuffer.wrap((byte[])value);
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} else {
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bb = (ByteBuffer)value;
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}
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write(attribute, bb);
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}
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@Override
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public final Map<String,Object> readAttributes(String[] attributes)
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throws IOException
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{
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// names of attributes to return
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List<String> names = new ArrayList<>();
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for (String name: attributes) {
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if (name.equals("*")) {
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names = list();
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break;
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} else {
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if (name.isEmpty())
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throw new IllegalArgumentException();
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names.add(name);
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}
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}
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// read each value and return in map
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Map<String,Object> result = new HashMap<>();
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for (String name: names) {
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int size = size(name);
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byte[] buf = new byte[size];
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int n = read(name, ByteBuffer.wrap(buf));
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byte[] value = (n == size) ? buf : Arrays.copyOf(buf, n);
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result.put(name, value);
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}
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return result;
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}
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}
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