1 /*
   2  * Copyright (c) 2014, 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 package jdk.internal.jrtfs;
  26 
  27 import java.io.IOException;
  28 import java.nio.file.FileStore;
  29 import java.nio.file.FileSystem;
  30 import java.nio.file.attribute.FileAttributeView;
  31 import java.nio.file.attribute.BasicFileAttributeView;
  32 import java.nio.file.attribute.FileStoreAttributeView;
  33 import java.util.Objects;
  34 
  35 /**
  36  * File store implementation for jrt file systems.
  37  *
  38  * @implNote This class needs to maintain JDK 8 source compatibility.
  39  *
  40  * It is used internally in the JDK to implement jimage/jrtfs access,
  41  * but also compiled and delivered as part of the jrtfs.jar to support access
  42  * to the jimage file provided by the shipped JDK by tools running on JDK 8.
  43  */
  44 final class JrtFileStore extends FileStore {
  45 
  46     protected final FileSystem jrtfs;
  47 
  48     JrtFileStore(JrtPath jrtPath) {
  49         this.jrtfs = jrtPath.getFileSystem();
  50     }
  51 
  52     @Override
  53     public String name() {
  54         return jrtfs.toString() + "/";
  55     }
  56 
  57     @Override
  58     public String type() {
  59         return "jrtfs";
  60     }
  61 
  62     @Override
  63     public boolean isReadOnly() {
  64         return jrtfs.isReadOnly();
  65     }
  66 
  67     @Override
  68     public boolean supportsFileAttributeView(String name) {
  69         return name.equals("basic") || name.equals("jrt");
  70     }
  71 
  72     @Override
  73     @SuppressWarnings("unchecked")
  74     public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type) {
  75         Objects.requireNonNull(type, "type");
  76         return (V) null;
  77     }
  78 
  79     @Override
  80     public long getTotalSpace() throws IOException {
  81         throw new UnsupportedOperationException("getTotalSpace");
  82     }
  83 
  84     @Override
  85     public long getUsableSpace() throws IOException {
  86         throw new UnsupportedOperationException("getUsableSpace");
  87     }
  88 
  89     @Override
  90     public long getUnallocatedSpace() throws IOException {
  91         throw new UnsupportedOperationException("getUnallocatedSpace");
  92     }
  93 
  94     @Override
  95     public Object getAttribute(String attribute) throws IOException {
  96         throw new UnsupportedOperationException("does not support " + attribute);
  97     }
  98 
  99     @Override
 100     public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
 101         return type == BasicFileAttributeView.class ||
 102                type == JrtFileAttributeView.class;
 103     }
 104 }