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 }