/* * Copyright (c) 2008, 2011, 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.nio.fs; import java.nio.ByteBuffer;import java.nio.file.attribute.UserDefinedFileAttributeView;import java.io.IOException;import java.util.*; /** * Base implementation of UserDefinedAttributeView */ abstract class AbstractUserDefinedFileAttributeView    implements UserDefinedFileAttributeView, DynamicFileAttributeView{    protected AbstractUserDefinedFileAttributeView() { }     protected void checkAccess(String file,                               boolean checkRead,                               boolean checkWrite)    {        assert checkRead || checkWrite;        SecurityManager sm = System.getSecurityManager();        if (sm != null) {            if (checkRead)                sm.checkRead(file);            if (checkWrite)                sm.checkWrite(file);            sm.checkPermission(new RuntimePermission("accessUserDefinedAttributes"));        }    }     @Override    public final String name() {        return "user";    }     @Override    public final void setAttribute(String attribute, Object value)        throws IOException    {        ByteBuffer bb;        if (value instanceof byte[]) {            bb = ByteBuffer.wrap((byte[])value);        } else {            bb = (ByteBuffer)value;        }        write(attribute, bb);    }     @Override    public final Map<String,Object> readAttributes(String[] attributes)        throws IOException    {        // names of attributes to return        List<String> names = new ArrayList<>();        for (String name: attributes) {            if (name.equals("*")) {                names = list();                break;            } else {                if (name.length() == 0)                    throw new IllegalArgumentException();                names.add(name);            }        }         // read each value and return in map        Map<String,Object> result = new HashMap<>();        for (String name: names) {            int size = size(name);            byte[] buf = new byte[size];            int n = read(name, ByteBuffer.wrap(buf));            byte[] value = (n == size) ? buf : Arrays.copyOf(buf, n);            result.put(name, value);        }        return result;    }}