package org.nchc.hadoop;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;


public class CheckAndDelete {
  // checkAndDelete函式，檢查是否存在該資料夾，若有則刪除之
  static boolean checkAndDelete(final String path, Configuration conf) {
    Path dst_path = new Path(path);
    try {
      // 產生操作hdfs的物件
      FileSystem hdfs = dst_path.getFileSystem(conf);
      // 檢查是否存在
      if (hdfs.exists(dst_path)) {
        // 有則刪除
        hdfs.delete(dst_path, true);
        return true;
      }else{
        return false;
      }

    } catch (IOException e) {
      e.printStackTrace();
      return false;
      
    }
    
  }
  static public void main(String args[]){
    Configuration conf = new Configuration();
    String path = "/user/hadoop/program_put_input";

    boolean status = checkAndDelete( path, conf);
    System.err.println("delete? :" + status);
    
  }
}