import java.nio.file.*;
import java.nio.file.attribute.*;
import java.io.IOException;

public class MoveAndCopyFiles {

  public static void main(String[] args) {
    Path current = Paths.get("D:/Beginning Java SE 7/Projects/MoveAndCopyFiles");
    Path newDir = Paths.get("junkDir");                                // New directory for files
    newDir = newDir.toAbsolutePath();                                  // Make path absolute
    createSingleDirectory(newDir);                                     // Create directory in current

    // Copy files from current directory to new
    System.out.println("Copying files from " + current + " to " + newDir);
    if(!copyFiles(current, newDir)) {
        System.out.println("Copying files failed.");
        return;
    }

    System.out.println("You can look at the directory to verify that the copy has worked.");
    System.out.println("Press Enter to continue.");
    waitForEnter();

    // Create another subdirectory in current
    Path newDir2 = Paths.get("junkDirBackup");
    newDir2 = newDir2.toAbsolutePath();                              // Make path absolute
    createSingleDirectory(newDir2);                                  // Create directory in current

    // Move files from newDir to newDir2
    System.out.println("Moving files from " + newDir + " to " + newDir2);
    if(!moveFiles(newDir, newDir2)) {
        System.out.println("Moving files failed.");
        return;
    }

    System.out.println("You can look at the directory to verify that the move has worked.");
    System.out.println("Press Enter to continue.");
    waitForEnter();

    // Now we can delete newDir because it is empty
    try{
      System.out.println("Deleting " + newDir + "...");
      Files.delete(newDir);
    } catch(IOException e) {
      System.err.println("Deleting " + newDir +" failed:\n" + e);
    }

    // Delete all files from newDir2
    try (DirectoryStream<Path> files = Files.newDirectoryStream(newDir2, "*.*")){
      System.out.println("Deleting files from " + newDir2 + "...");
      for(Path file : files) {
        Files.delete(file);                                            // Delete the file
        System.out.println("  " + file.getFileName() + " deleted.");
      }

      // Now delete the directory
      System.out.println("Deleting " + newDir2 + "...");
      Files.delete(newDir2);
    } catch(IOException e) {
      System.err.println("I/O error deleting files. " + e);
    }
    return;
  }

  // Create a directory
  static void createSingleDirectory(Path path) {
    try {
      Files.createDirectories(path);
      System.out.println("\n" + path + " directory created.");
    } catch(IOException e) {
      System.err.println("\nDirectory creation failed:\n" + e);
    }
  }

  // Check for a path referencing a directory
  static boolean isDirectory(Path path) {
    try {
    BasicFileAttributes attr = Files.readAttributes(path, BasicFileAttributes.class);
    return attr.isDirectory();
    } catch(IOException e) {
      System.err.println("I/O error in isDirectory method. " + e);
    }
    return false;
  }

  // Copy the files in the from directory to the to directory
  static boolean copyFiles(Path from, Path to) {
    if(!isDirectory(from)) {
      System.out.println("Cannot copy files. " + from + " is not a directory.");
      return false;
    } else if(!isDirectory(to)) {
      System.out.println("Cannot copy files. " + to + " is not a directory.");
      return false;
    }

    try (DirectoryStream<Path> files = Files.newDirectoryStream(from, "*.*")) {
      System.out.println("Starting copy...");
      for(Path file : files) {
        Files.copy(file, to.resolve(file.getFileName())); // Copy the file
        System.out.println("  " + file.getFileName() + " copied.");
      }
    } catch(IOException e) {
      System.err.println("I/O error in copyFiles. " + e);
      return false;
    }
    return true;
  }

  // Move files from from directory to to directory
  static boolean moveFiles(Path from, Path to) {
    if(!isDirectory(from)) {
      System.out.println("Cannot move files. " + from + " is not a directory.");
      return false;
    } else if(!isDirectory(to)) {
      System.out.println("Cannot move files. " + to + " is not a directory.");
      return false;
    }
    try (DirectoryStream<Path> files = Files.newDirectoryStream(from, "*.*")) {
      System.out.println("Starting move files...");
      for(Path file : files) {
        Files.move(file, to.resolve(file.getFileName())); // Move the file
        System.out.println("  " + file.getFileName() + " moved.");
      }
    } catch(IOException e) {      System.err.println("I/O error in copyFiles. " + e);
      return false;
    }
    return true;
  }

  // Wait until Enter key pressed
  static void waitForEnter() {
    try {
        System.in.read();
    } catch(IOException e) {
        System.err.println(e);
    }
  }
}