1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.nio.fs;
  27 
  28 import java.nio.file.*;
  29 import java.nio.file.spi.FileSystemProvider;
  30 import java.io.IOException;
  31 import java.util.Map;
  32 
  33 /**
  34  * Base implementation class of FileSystemProvider
  35  */
  36 
  37 abstract class AbstractFileSystemProvider extends FileSystemProvider {
  38     protected AbstractFileSystemProvider() { }
  39 
  40     /**
  41      * Splits the given attribute name into the name of an attribute view and
  42      * the attribute. If the attribute view is not identified then it assumed
  43      * to be "basic".
  44      */
  45     private static String[] split(String attribute) {
  46         String[] s = new String[2];
  47         int pos = attribute.indexOf(':');
  48         if (pos == -1) {
  49             s[0] = "basic";
  50             s[1] = attribute;
  51         } else {
  52             s[0] = attribute.substring(0, pos++);
  53             s[1] = (pos == attribute.length()) ? "" : attribute.substring(pos);
  54         }
  55         return s;
  56     }
  57 
  58     /**
  59      * Gets a DynamicFileAttributeView by name. Returns {@code null} if the
  60      * view is not available.
  61      */
  62     abstract DynamicFileAttributeView getFileAttributeView(Path file,
  63                                                            String name,
  64                                                            LinkOption... options);
  65 
  66     @Override
  67     public final void setAttribute(Path file,
  68                                    String attribute,
  69                                    Object value,
  70                                    LinkOption... options)
  71         throws IOException
  72     {
  73         String[] s = split(attribute);
  74         if (s[0].length() == 0)
  75             throw new IllegalArgumentException(attribute);
  76         DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
  77         if (view == null)
  78             throw new UnsupportedOperationException("View '" + s[0] + "' not available");
  79         view.setAttribute(s[1], value);
  80     }
  81 
  82     @Override
  83     public final Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
  84         throws IOException
  85     {
  86         String[] s = split(attributes);
  87         if (s[0].length() == 0)
  88             throw new IllegalArgumentException(attributes);
  89         DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
  90         if (view == null)
  91             throw new UnsupportedOperationException("View '" + s[0] + "' not available");
  92         return view.readAttributes(s[1].split(","));
  93     }
  94 
  95     /**
  96      * Deletes a file. The {@code failIfNotExists} parameters determines if an
  97      * {@code IOException} is thrown when the file does not exist.
  98      */
  99     abstract boolean implDelete(Path file, boolean failIfNotExists) throws IOException;
 100 
 101     @Override
 102     public final void delete(Path file) throws IOException {
 103         implDelete(file, true);
 104     }
 105 
 106     @Override
 107     public final boolean deleteIfExists(Path file) throws IOException {
 108         return implDelete(file, false);
 109     }
 110 }