Android Open Source - dr.fex File System

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License

The source code is released under:

MIT License

Java Source Code

package co.vrcode.util;
/*from  w w  w  .ja v  a 2  s .  c  o  m*/

import java.net.FileNameMap;
import java.net.URLConnection;
import java.text.DecimalFormat;
import android.annotation.SuppressLint;
import android.webkit.MimeTypeMap;






/**
 * File System Utilities
 * 
 * @author VRCode
 *
 */

public class FileSystem {

  
  /**
   * Returns a human readable byte number representation.<br/>
   * Numbers larger than 999 TB are currently not supported.
   * 
   * @param bytesNumber  Plain bytes number
   * 
   * @return A human readable bytes representation
   * 
   */
  public static String getFormattedBytesString(long bytesNumber) {
    if (bytesNumber < 0) {
      return "Unknown";
    }

    String ret = "";
    DecimalFormat decimal = new DecimalFormat("0.00");
    Number size = bytesNumber;
    int step = 0;

    if (size.longValue() >= 1024) {
      size = size.longValue() / 1024;
      step++;
    }

    if (size.longValue() >= 1024) {
      size = size.floatValue() / 1024;
      step++;
    }

    if (size.longValue() >= 1024) {
      size = size.floatValue() / 1024;
      step++;
    }

    if (size.longValue() >= 1024) {
      size = size.floatValue() / 1024;
      step++;
    }

    switch (step) {
      case 0:
        ret = size + " bytes";
        break;
      case 1:
        ret = size + " KB";
        break;
      case 2:
        ret = decimal.format(size) + " MB";
        break;
      case 3:
        ret = decimal.format(size) + " GB";
        break;
      case 4:
        ret = decimal.format(size) + " TB";
        break;
    }

    return ret;
  }


  /**
   * Returns the Mime type for a file string.
   * @param file  A file String
   * @return  The detected Mime type for the passed file string
   *       or "application/octet-stream" otherwise
   */
  public static String getMimeType(String file) {
    String ext = getExtensionForFile(file);
    String mime = MimeTypeMap
      .getSingleton()
      .getMimeTypeFromExtension(ext);

    if (mime == null) {
      FileNameMap fnm = URLConnection.getFileNameMap();
      mime = fnm.getContentTypeFor(file);
    }

    if (mime == null) {
      mime = "application/octet-stream";
    }

    return mime;
  }


  /**
   * Returns extension for the passed File
   * 
   * @param file  File to get the extension from 
   * 
   * @return File extension
   */
  @SuppressLint("DefaultLocale")
  public static String getExtensionForFile(String file) {
    String ret = "";
    String fileName = file.substring(file.lastIndexOf("/") + 1); //  fileObj.getName(); 
    int dotIndex = fileName.lastIndexOf(".");

    // Dot (.) must not be the first character
    // If it is, it's not an extension, but part
    // of the file name
    if (dotIndex > 0) {
      ret = fileName.substring(dotIndex + 1).toLowerCase();
    }

    return ret;
  }

}

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