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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 | +} | |