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| 1 | /* | ||
| 2 | * Copyright (c) 2007, 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.BasicFileAttributes; | ||
| 29 | import java.io.IOException; | ||
| 30 | import java.util.Objects; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * A simple visitor of files with default behavior to visit all files and to | ||
| 34 | * re-throw I/O errors. | ||
| 35 | * | ||
| 36 | * <p> Methods in this class may be overridden subject to their general contract. | ||
| 37 | * | ||
| 38 | * @param <T> The type of reference to the files | ||
| 39 | * | ||
| 40 | * @since 1.7 | ||
| 41 | */ | ||
| 42 | |||
| 43 | public class SimpleFileVisitor<T> implements FileVisitor<T> { | ||
| 44 | /** | ||
| 45 | * Initializes a new instance of this class. | ||
| 46 | */ | ||
| 47 | protected SimpleFileVisitor() { | ||
| 48 | } | ||
| 49 | |||
| 50 | /** | ||
| 51 | * Invoked for a directory before entries in the directory are visited. | ||
| 52 | * | ||
| 53 | * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE | ||
| 54 | * CONTINUE}. | ||
| 55 | */ | ||
| 56 | @Override | ||
| 57 | public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs) | ||
| 58 | throws IOException | ||
| 59 | { | ||
| 60 | Objects.requireNonNull(dir); | ||
| 61 | Objects.requireNonNull(attrs); | ||
| 62 | return FileVisitResult.CONTINUE; | ||
| 63 | } | ||
| 64 | |||
| 65 | /** | ||
| 66 | * Invoked for a file in a directory. | ||
| 67 | * | ||
| 68 | * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE | ||
| 69 | * CONTINUE}. | ||
| 70 | */ | ||
| 71 | @Override | ||
| 72 | public FileVisitResult visitFile(T file, BasicFileAttributes attrs) | ||
| 73 | throws IOException | ||
| 74 | { | ||
| 75 | Objects.requireNonNull(file); | ||
| 76 | Objects.requireNonNull(attrs); | ||
| 77 | return FileVisitResult.CONTINUE; | ||
| 78 | } | ||
| 79 | |||
| 80 | /** | ||
| 81 | * Invoked for a file that could not be visited. | ||
| 82 | * | ||
| 83 | * <p> Unless overridden, this method re-throws the I/O exception that prevented | ||
| 84 | * the file from being visited. | ||
| 85 | */ | ||
| 86 | @Override | ||
| 87 | public FileVisitResult visitFileFailed(T file, IOException exc) | ||
| 88 | throws IOException | ||
| 89 | { | ||
| 90 | Objects.requireNonNull(file); | ||
| 91 | throw exc; | ||
| 92 | } | ||
| 93 | |||
| 94 | /** | ||
| 95 | * Invoked for a directory after entries in the directory, and all of their | ||
| 96 | * descendants, have been visited. | ||
| 97 | * | ||
| 98 | * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE | ||
| 99 | * CONTINUE} if the directory iteration completes without an I/O exception; | ||
| 100 | * otherwise this method re-throws the I/O exception that caused the iteration | ||
| 101 | * of the directory to terminate prematurely. | ||
| 102 | */ | ||
| 103 | @Override | ||
| 104 | public FileVisitResult postVisitDirectory(T dir, IOException exc) | ||
| 105 | throws IOException | ||
| 106 | { | ||
| 107 | Objects.requireNonNull(dir); | ||
| 108 | if (exc != null) | ||
| 109 | throw exc; | ||
| 110 | return FileVisitResult.CONTINUE; | ||
| 111 | } | ||
| 112 | } | ||