Android Open Source - Alfred4Android File Info

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License

The source code is released under:

Apache License

Java Source Code

package com.toraleap.collimator.util;
/*from ww w. java 2 s.  c o m*/
import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.toraleap.collimator.R;

import android.content.Context;
import android.content.SharedPreferences;

/**
 * ?????????????????????????
 * @author    uestc.Mobius <mobius@toraleap.com>
 * @version  2010.1025
 */
public class FileInfo {

  private static Context sContext;
  
  private FileInfo() { }
  
  /**
   * ???????????????????????????
   * @param filename  ??????
   * @return ?????????????????????(?????????????)
   */
  public static String mainName(String filename) {
    int start = filename.lastIndexOf("/");
    int stop = filename.lastIndexOf(".");
    if (stop < start) stop = filename.length();
    if (start >= 0) {
      return filename.substring(start + 1, stop);
    } else {
      return "";
    }
  }
  
  /**
   * ???????????????????????
   * @param filename  ??????
   * @return ?????????????????(?????????)
   */
  public static String extension(String filename) {
    int start = filename.lastIndexOf("/");
    int stop = filename.lastIndexOf(".");
    if (stop < start || stop >= filename.length() - 1) return "";
    else return filename.substring(stop + 1, filename.length());
  }
  
  /**
   * ?????????????? MIME ????
   * @param filename  ??????
   * @return ???????? MIME ????
   */
  public static String mimeType(String filename) {
    String ext = extension(filename);
    String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext);
    return (mime == null) ? "*.*" : mime;
  }
  
  /**
   * ???????????????????????????
   * @param size  ?????????
   * @return  ????????????????
   */
  public static String sizeString(long size) {
    if (size < 1024)
      return String.format("%d B", size);
    else if (size < 1024 * 1024)
      return String.format("%.2f KB", (double)size / 1024);
    else if (size < 1024 * 1024 * 1024)
      return String.format("%.2f MB", (double)size / (1024 * 1024));
    else if (size < 1024L * 1024 * 1024 * 1024)
      return String.format("%.2f GB", (double)size / (1024 * 1024 * 1024));
    else
      return String.format("%.2f EB", (double)size / (1024L * 1024 * 1024 * 1024));
  }
  
  /**
   * ????????????????????????????????
   * @param sizeString  ????????????????
   * @return  ?????????
   * @throws ParseException  ?????????????????????????????
   */
  public static long stringToSize(String sizeString) throws ParseException {
    Pattern pattern = Pattern.compile("(-?\\d+\\.?\\d*)([\\w]{0,2})", Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(sizeString);
    if (matcher.matches()) {
      double baseSize = Double.parseDouble(matcher.group(1));
      String unit = matcher.group(2).toLowerCase();
      if (unit.equals("b") || unit.length() == 0) {
        return (long)baseSize;
      } else if (unit.equals("k") || unit.equals("kb")) {
        return (long)(baseSize * 1024);
      } else if (unit.equals("m") || unit.equals("mb")) {
        return (long)(baseSize * (1024 * 1024));
      } else if (unit.equals("g") || unit.equals("gb")) {
        return (long)(baseSize * (1024 * 1024 * 1024));
      } else if (unit.equals("e") || unit.equals("eb")) {
        return (long)(baseSize * (1024L * 1024 * 1024 * 1024));
      }
    }
    throw new ParseException(sizeString, 0);
  }
  
  /**
   * ????????????????????????????????????????????
   * @param millisec  ????????????????????
   * @return  ??????????????
   */
  public static String timeString(long timeMillis) {
    if (timeMillis < 1000)
      return sContext.getString(R.string.util_fileinfo_milliseconds, timeMillis);
    else if (timeMillis < 1000 * 60)
      return sContext.getString(R.string.util_fileinfo_seconds, timeMillis / 1000);
    else if (timeMillis < 1000 * 60 * 60)
      return sContext.getString(R.string.util_fileinfo_minutes, timeMillis / (1000 * 60));
    else if (timeMillis < 1000 * 60 * 60 * 48)
      return sContext.getString(R.string.util_fileinfo_hours, timeMillis / (1000 * 60 * 60));
    else if (timeMillis < 1000L * 60 * 60 * 24 * 60)
      return sContext.getString(R.string.util_fileinfo_days, timeMillis / (1000L * 60 * 60 * 24));
    else if (timeMillis < 1000L * 60 * 60 * 24 * 30 * 12)
      return sContext.getString(R.string.util_fileinfo_months, timeMillis / (1000L * 60 * 60 * 24 * 30));
    else
      return sContext.getString(R.string.util_fileinfo_years, timeMillis / (1000L * 60 * 60 * 24 * 30 * 12));
  }
  
  /**
   * ??????????????????????????
   * @param millisec  ????????????
   * @return  ???????????????
   */
  public static String timeSpanString(long timeMillis) {
    if (timeMillis > 0) {
      return sContext.getString(R.string.util_fileinfo_ago, timeString(timeMillis));
    } else {
      return sContext.getString(R.string.util_fileinfo_hence, timeString(-timeMillis));
    }
  }
  
  /**
   * ???????????????????????????????
   * @param sizeString  ??????????????
   * @return  ??????
   * @throws ParseException  ?????????????????????????????
   */
  public static long timespanToMillis(String timeString) throws ParseException {
    Pattern pattern = Pattern.compile("(-?\\d+\\.?\\d*)([\\w]{0,1})", Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(timeString);
    if (matcher.matches()) {
      double baseMillis = Double.parseDouble(matcher.group(1));
      String unit = matcher.group(2).toLowerCase();
      if (unit.equals("d") || unit.length() == 0) {
        return (long)(baseMillis * 1000 * 3600 * 24);
      } else if (unit.equals("h")) {
        return (long)(baseMillis * 1000 * 3600);
      } else if (unit.equals("w")) {
        return (long)(baseMillis * 1000 * 3600 * 24 * 7);
      } else if (unit.equals("m")) {
        return (long)(baseMillis * 1000 * 3600 * 24 * 30);
      } else if (unit.equals("y")) {
        return (long)(baseMillis * 1000 * 3600 * 24 * 360);
      }
    }
    throw new ParseException(timeString, 0);
  }
  
  /**
   * ???????????????????????????????????????????????????????
   * @param prefs      ????????????????????????????
   * @param context    ??????????(?????? Activity ?????????????? getApplicationContext() ???)
   */
  public static void init(SharedPreferences prefs, Context context) {
    sContext = context;
  }
}

Java Source Code List

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