Move sub tree - Java File Path IO

Java examples for File Path IO:File Visitor

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Description

Move sub tree

Demo Code

import static java.nio.file.StandardCopyOption.COPY_ATTRIBUTES;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;

import java.io.IOException;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.util.EnumSet;

class MoveTree implements FileVisitor<Object> {
  Path moveFrom,moveTo;//from w w w. j  ava2s.  co m
  static FileTime time = null;

  public MoveTree(Path moveFrom, Path moveTo) {
    this.moveFrom = moveFrom;
    this.moveTo = moveTo;
  }

  static void moveSubTree(Path moveFrom, Path moveTo) throws IOException {
    try {
      Files.copy(moveFrom, moveTo, REPLACE_EXISTING, COPY_ATTRIBUTES);
      Files.delete(moveFrom);
    } catch (IOException e) {
      System.err.println("Unable to move " + moveFrom + " [" + e + "]");
    }
  }

  @Override
  public FileVisitResult postVisitDirectory(Object dir, IOException exc)
      throws IOException {
    Path newdir = moveTo.resolve(moveFrom.relativize((Path) dir));
    try {
      Files.setLastModifiedTime(newdir, time);
      Files.delete((Path) dir);
    } catch (IOException e) {
      System.err.println("Unable to delete: " + (Path) dir + " [" + e + "]");
    }

    return FileVisitResult.CONTINUE;
  }

  @Override
  public FileVisitResult preVisitDirectory(Object dir, BasicFileAttributes attrs)
      throws IOException {
    System.out.println("Move directory: " + (Path) dir);
    Path newdir = moveTo.resolve(moveFrom.relativize((Path) dir));
    try {
      Files.copy((Path) dir, newdir, REPLACE_EXISTING, COPY_ATTRIBUTES);
      time = Files.getLastModifiedTime((Path) dir);
    } catch (IOException e) {
      System.err.println("Unable to create " + newdir + " [" + e + "]");
      return FileVisitResult.SKIP_SUBTREE;
    }

    return FileVisitResult.CONTINUE;
  }

  @Override
  public FileVisitResult visitFile(Object file, BasicFileAttributes attrs)
      throws IOException {
    System.out.println("Move file: " + (Path) file);
    moveSubTree((Path) file, moveTo.resolve(moveFrom.relativize((Path) file)));
    return FileVisitResult.CONTINUE;
  }

  @Override
  public FileVisitResult visitFileFailed(Object file, IOException exc)
      throws IOException {
    return FileVisitResult.CONTINUE;
  }
}

class Main {
  public static void main(String[] args) throws IOException {
    Path moveFrom = Paths.get("C:/folder1");
    Path moveTo = Paths.get("C:/folder2");

    MoveTree walk = new MoveTree(moveFrom, moveTo);
    EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);

    Files.walkFileTree(moveFrom, opts, Integer.MAX_VALUE, walk);
  }
}

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