Copy.java~

package dataToGraph;
/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

import java.nio.file.*;
import static java.nio.file.StandardCopyOption.*;
import java.nio.file.attribute.*;
import static java.nio.file.FileVisitResult.*;
import java.io.IOException;
import java.util.*;

/**
 * Sample code that copies files in a similar manner to the cp(1) program.
 */

public class Copy {

	/**
	 * Copy source file to target location. If {@code prompt} is true then
	 * prompt user to overwrite target if it exists. The {@code preserve}
	 * parameter determines if file attributes should be copied/preserved.
	 */
	static void copyFile(Path source, Path target, boolean prompt, boolean preserve) {
		CopyOption[] options = (preserve) ?
				new CopyOption[] { COPY_ATTRIBUTES, REPLACE_EXISTING } :
					new CopyOption[] { REPLACE_EXISTING };
				if (!prompt || Files.notExists(target)) {
					try {
						Files.copy(source, target, options);
					} catch (IOException x) {
						System.err.format("Unable to copy: %s: %s%n", source, x);
					}
				}
	}

	/**
	 * A {@code FileVisitor} that copies a file-tree, same as bash cp -r
	 */
	static class TreeCopier implements FileVisitor<Path> {
		private final Path source;
		private final Path target;
		private final boolean prompt;
		private final boolean preserve;

		TreeCopier(Path source, Path target, boolean prompt, boolean preserve) {
			this.source = source;
			this.target = target;
			this.prompt = prompt;
			this.preserve = preserve;
		}

		@Override
		public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
			// before visiting entries in a directory we copy the directory
			// (okay if directory already exists).
			CopyOption[] options = (preserve) ?
					new CopyOption[] { COPY_ATTRIBUTES } : new CopyOption[0];

					Path newdir = target.resolve(source.relativize(dir));
					try {
						Files.copy(dir, newdir, options);
					} catch (FileAlreadyExistsException x) {
						// ignore
					} catch (IOException x) {
						System.err.format("Unable to create: %s: %s%n", newdir, x);
						return SKIP_SUBTREE;
					}
					return CONTINUE;
		}

		@Override
		public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
			copyFile(file, target.resolve(source.relativize(file)),
					prompt, preserve);
			return CONTINUE;
		}

		@Override
		public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
			// fix up modification time of directory when done
			if (exc == null && preserve) {
				Path newdir = target.resolve(source.relativize(dir));
				try {
					FileTime time = Files.getLastModifiedTime(dir);
					Files.setLastModifiedTime(newdir, time);
				} catch (IOException x) {
					System.err.format("Unable to copy all attributes to: %s: %s%n", newdir, x);
				}
			}
			return CONTINUE;
		}

		@Override
		public FileVisitResult visitFileFailed(Path file, IOException exc) {
			if (exc instanceof FileSystemLoopException) {
				System.err.println("cycle detected: " + file);
			} else {
				System.err.format("Unable to copy: %s: %s%n", file, exc);
			}
			return CONTINUE;
		}
	}

	
	public void copyDir(Path source, Path target) throws IOException {
		boolean prompt = false;
		boolean preserve = true;


		// check if target is a directory
		boolean isDir = Files.isDirectory(target);
		Path dest = (isDir) ? target.resolve(source.getFileName()) : target;

		// follow links when copying files
		EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
		TreeCopier tc = new TreeCopier(source, dest, prompt, preserve);
		Files.walkFileTree(source, opts, Integer.MAX_VALUE, tc);

		System.out.println(source.toString() + " copied to " + target.toString());
	}
	
}