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| 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 java.nio.file; | ||
| 27 | |||
| 28 | import java.nio.file.attribute.*; | ||
| 29 | import java.io.InputStream; | ||
| 30 | import java.io.IOException; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * Helper class to support copying or moving files when the source and target | ||
| 34 | * are associated with different providers. | ||
| 35 | */ | ||
| 36 | |||
| 37 | class CopyMoveHelper { | ||
| 38 | private CopyMoveHelper() { } | ||
| 39 | |||
| 40 | /** | ||
| 41 | * Parses the arguments for a file copy operation. | ||
| 42 | */ | ||
| 43 | private static class CopyOptions { | ||
| 44 | boolean replaceExisting = false; | ||
| 45 | boolean copyAttributes = false; | ||
| 46 | boolean followLinks = true; | ||
| 47 | |||
| 48 | private CopyOptions() { } | ||
| 49 | |||
| 50 | static CopyOptions parse(CopyOption... options) { | ||
| 51 | CopyOptions result = new CopyOptions(); | ||
| 52 | for (CopyOption option: options) { | ||
| 53 | if (option == StandardCopyOption.REPLACE_EXISTING) { | ||
| 54 | result.replaceExisting = true; | ||
| 55 | continue; | ||
| 56 | } | ||
| 57 | if (option == LinkOption.NOFOLLOW_LINKS) { | ||
| 58 | result.followLinks = false; | ||
| 59 | continue; | ||
| 60 | } | ||
| 61 | if (option == StandardCopyOption.COPY_ATTRIBUTES) { | ||
| 62 | result.copyAttributes = true; | ||
| 63 | continue; | ||
| 64 | } | ||
| 65 | if (option == null) | ||
| 66 | throw new NullPointerException(); | ||
| 67 | throw new UnsupportedOperationException("'" + option + | ||
| 68 | "' is not a recognized copy option"); | ||
| 69 | } | ||
| 70 | return result; | ||
| 71 | } | ||
| 72 | } | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Converts the given array of options for moving a file to options suitable | ||
| 76 | * for copying the file when a move is implemented as copy + delete. | ||
| 77 | */ | ||
| 78 | private static CopyOption[] convertMoveToCopyOptions(CopyOption... options) | ||
| 79 | throws AtomicMoveNotSupportedException | ||
| 80 | { | ||
| 81 | int len = options.length; | ||
| 82 | CopyOption[] newOptions = new CopyOption[len+2]; | ||
| 83 | for (int i=0; i<len; i++) { | ||
| 84 | CopyOption option = options[i]; | ||
| 85 | if (option == StandardCopyOption.ATOMIC_MOVE) { | ||
| 86 | throw new AtomicMoveNotSupportedException(null, null, | ||
| 87 | "Atomic move between providers is not supported"); | ||
| 88 | } | ||
| 89 | newOptions[i] = option; | ||
| 90 | } | ||
| 91 | newOptions[len] = LinkOption.NOFOLLOW_LINKS; | ||
| 92 | newOptions[len+1] = StandardCopyOption.COPY_ATTRIBUTES; | ||
| 93 | return newOptions; | ||
| 94 | } | ||
| 95 | |||
| 96 | /** | ||
| 97 | * Simple copy for use when source and target are associated with different | ||
| 98 | * providers | ||
| 99 | */ | ||
| 100 | static void copyToForeignTarget(Path source, Path target, | ||
| 101 | CopyOption... options) | ||
| 102 | throws IOException | ||
| 103 | { | ||
| 104 | CopyOptions opts = CopyOptions.parse(options); | ||
| 105 | LinkOption[] linkOptions = (opts.followLinks) ? new LinkOption[0] : | ||
| 106 | new LinkOption[] { LinkOption.NOFOLLOW_LINKS }; | ||
| 107 | |||
| 108 | // attributes of source file | ||
| 109 | BasicFileAttributes attrs = Files.readAttributes(source, | ||
| 110 | BasicFileAttributes.class, | ||
| 111 | linkOptions); | ||
| 112 | if (attrs.isSymbolicLink()) | ||
| 113 | throw new IOException("Copying of symbolic links not supported"); | ||
| 114 | |||
| 115 | // delete target if it exists and REPLACE_EXISTING is specified | ||
| 116 | if (opts.replaceExisting) { | ||
| 117 | Files.deleteIfExists(target); | ||
| 118 | } else if (Files.exists(target)) | ||
| 119 | throw new FileAlreadyExistsException(target.toString()); | ||
| 120 | |||
| 121 | // create directory or copy file | ||
| 122 | if (attrs.isDirectory()) { | ||
| 123 | Files.createDirectory(target); | ||
| 124 | } else { | ||
| 125 | try (InputStream in = Files.newInputStream(source)) { | ||
| 126 | Files.copy(in, target); | ||
| 127 | } | ||
| 128 | } | ||
| 129 | |||
| 130 | // copy basic attributes to target | ||
| 131 | if (opts.copyAttributes) { | ||
| 132 | BasicFileAttributeView view = | ||
| 133 | Files.getFileAttributeView(target, BasicFileAttributeView.class, linkOptions); | ||
| 134 | try { | ||
| 135 | view.setTimes(attrs.lastModifiedTime(), | ||
| 136 | attrs.lastAccessTime(), | ||
| 137 | attrs.creationTime()); | ||
| 138 | } catch (Throwable x) { | ||
| 139 | // rollback | ||
| 140 | try { | ||
| 141 | Files.delete(target); | ||
| 142 | } catch (Throwable suppressed) { | ||
| 143 | x.addSuppressed(suppressed); | ||
| 144 | } | ||
| 145 | throw x; | ||
| 146 | } | ||
| 147 | } | ||
| 148 | } | ||
| 149 | |||
| 150 | /** | ||
| 151 | * Simple move implements as copy+delete for use when source and target are | ||
| 152 | * associated with different providers | ||
| 153 | */ | ||
| 154 | static void moveToForeignTarget(Path source, Path target, | ||
| 155 | CopyOption... options) throws IOException | ||
| 156 | { | ||
| 157 | copyToForeignTarget(source, target, convertMoveToCopyOptions(options)); | ||
| 158 | Files.delete(source); | ||
| 159 | } | ||
| 160 | } | ||