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214 lines
8.0 KiB
214 lines
8.0 KiB
/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This source code is provided to illustrate the usage of a given feature
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* or technique and has been deliberately simplified. Additional steps
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* required for a production-quality application, such as security checks,
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* input validation and proper error handling, might not be present in
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* this sample code.
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*/
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import java.nio.file.*;
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import static java.nio.file.StandardCopyOption.*;
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import java.nio.file.attribute.*;
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import static java.nio.file.FileVisitResult.*;
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import java.io.IOException;
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import java.util.*;
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/**
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* Sample code that copies files in a similar manner to the cp(1) program.
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*/
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public class Copy {
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/**
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* Returns {@code true} if okay to overwrite a file ("cp -i")
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*/
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static boolean okayToOverwrite(Path file) {
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String answer = System.console().readLine("overwrite %s (yes/no)? ", file);
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return (answer.equalsIgnoreCase("y") || answer.equalsIgnoreCase("yes"));
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}
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/**
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* Copy source file to target location. If {@code prompt} is true then
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* prompt user to overwrite target if it exists. The {@code preserve}
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* parameter determines if file attributes should be copied/preserved.
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*/
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static void copyFile(Path source, Path target, boolean prompt, boolean preserve) {
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CopyOption[] options = (preserve) ?
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new CopyOption[] { COPY_ATTRIBUTES, REPLACE_EXISTING } :
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new CopyOption[] { REPLACE_EXISTING };
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if (!prompt || Files.notExists(target) || okayToOverwrite(target)) {
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try {
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Files.copy(source, target, options);
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} catch (IOException x) {
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System.err.format("Unable to copy: %s: %s%n", source, x);
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}
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}
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}
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/**
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* A {@code FileVisitor} that copies a file-tree ("cp -r")
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*/
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static class TreeCopier implements FileVisitor<Path> {
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private final Path source;
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private final Path target;
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private final boolean prompt;
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private final boolean preserve;
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TreeCopier(Path source, Path target, boolean prompt, boolean preserve) {
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this.source = source;
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this.target = target;
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this.prompt = prompt;
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this.preserve = preserve;
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}
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@Override
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public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
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// before visiting entries in a directory we copy the directory
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// (okay if directory already exists).
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CopyOption[] options = (preserve) ?
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new CopyOption[] { COPY_ATTRIBUTES } : new CopyOption[0];
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Path newdir = target.resolve(source.relativize(dir));
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try {
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Files.copy(dir, newdir, options);
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} catch (FileAlreadyExistsException x) {
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// ignore
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} catch (IOException x) {
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System.err.format("Unable to create: %s: %s%n", newdir, x);
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return SKIP_SUBTREE;
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}
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return CONTINUE;
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}
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@Override
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public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
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copyFile(file, target.resolve(source.relativize(file)),
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prompt, preserve);
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return CONTINUE;
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}
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@Override
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public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
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// fix up modification time of directory when done
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if (exc == null && preserve) {
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Path newdir = target.resolve(source.relativize(dir));
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try {
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FileTime time = Files.getLastModifiedTime(dir);
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Files.setLastModifiedTime(newdir, time);
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} catch (IOException x) {
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System.err.format("Unable to copy all attributes to: %s: %s%n", newdir, x);
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}
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}
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return CONTINUE;
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}
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@Override
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public FileVisitResult visitFileFailed(Path file, IOException exc) {
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if (exc instanceof FileSystemLoopException) {
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System.err.println("cycle detected: " + file);
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} else {
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System.err.format("Unable to copy: %s: %s%n", file, exc);
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}
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return CONTINUE;
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}
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}
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static void usage() {
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System.err.println("java Copy [-ip] source... target");
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System.err.println("java Copy -r [-ip] source-dir... target");
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System.exit(-1);
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}
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public static void main(String[] args) throws IOException {
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boolean recursive = false;
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boolean prompt = false;
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boolean preserve = false;
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// process options
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int argi = 0;
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while (argi < args.length) {
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String arg = args[argi];
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if (!arg.startsWith("-"))
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break;
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if (arg.length() < 2)
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usage();
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for (int i=1; i<arg.length(); i++) {
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char c = arg.charAt(i);
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switch (c) {
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case 'r' : recursive = true; break;
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case 'i' : prompt = true; break;
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case 'p' : preserve = true; break;
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default : usage();
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}
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}
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argi++;
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}
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// remaining arguments are the source files(s) and the target location
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int remaining = args.length - argi;
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if (remaining < 2)
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usage();
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Path[] source = new Path[remaining-1];
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int i=0;
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while (remaining > 1) {
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source[i++] = Paths.get(args[argi++]);
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remaining--;
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}
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Path target = Paths.get(args[argi]);
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// check if target is a directory
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boolean isDir = Files.isDirectory(target);
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// copy each source file/directory to target
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for (i=0; i<source.length; i++) {
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Path dest = (isDir) ? target.resolve(source[i].getFileName()) : target;
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if (recursive) {
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// follow links when copying files
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EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
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TreeCopier tc = new TreeCopier(source[i], dest, prompt, preserve);
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Files.walkFileTree(source[i], opts, Integer.MAX_VALUE, tc);
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} else {
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// not recursive so source must not be a directory
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if (Files.isDirectory(source[i])) {
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System.err.format("%s: is a directory%n", source[i]);
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continue;
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}
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copyFile(source[i], dest, prompt, preserve);
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}
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}
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}
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}
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