Android Open Source - senhancelib Utils

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License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

package de.uos.nbp;
/*from   w  w w .  j ava  2s  .  co  m*/
import java.util.Date;

/**
 * Miscellaneous Java functions that may be of utility
 * to anyone in the NBP group.
 * 
 * @author rmuil@UoS.de
 */
public class Utils {
  public static final double MsecsInMin = 60.0*1000.0;
    
  private static final char SeparatorChar = '|';
  
    static final char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();

  /* static helper functions */
  public static String ByteArrayToHexa(byte[] a) {
    return ByteArrayToHexa(a, 0, a.length);
  }
  public static String ByteArrayToHexa(byte[] a, int nbytes) {
    return ByteArrayToHexa(a, 0, nbytes);
  }
  public static String ByteArrayToHexa(byte[] a, int offset, int nbytes) {

      if (nbytes > (a.length-offset))
        nbytes = (a.length-offset);
      
    StringBuilder buf = new StringBuilder(nbytes*3+2); /* each byte is 2 characters plus a separator */
    
    for (int ii = offset; ii < offset+nbytes; ii++) {
      //buf.append(ByteToHexa(a[ii]));
      buf.append(HEX_CHARS[(a[ii] & 0xF0) >>> 4]);
      buf.append(HEX_CHARS[ a[ii] & 0x0F]);
          
      if (ii < offset+nbytes-1)
        buf.append(SeparatorChar);
    }
    
    return buf.toString();
  }
  public static char[] ByteToHexa(byte a) {
    char[] buf = new char[2];
    
    buf[0]=HEX_CHARS[(a & 0xF0) >>> 4];
    buf[1]=HEX_CHARS[ a & 0x0F];
    
    return buf;
  }
  
  /**
   * @see <a href="http://stackoverflow.com/questions/2517709/java-comparing-two-dates-to-see-if-they-are-in-the-same-day">StackOverflow: java-comparing-two-dates-to-see-if-they-are-in-the-same-day</a>
   */
  public static boolean isSameDay(Date date1, Date date2) {

    long MILLIS_PER_DAY = 1000 * 60 * 60 * 24;
      // Strip out the time part of each date.
      long dayNumber1 = date1.getTime() / MILLIS_PER_DAY;
      long dayNumber2 = date2.getTime() / MILLIS_PER_DAY;

      // If they now are equal then it is the same day.
      return dayNumber1 == dayNumber2;
  }
  
  
  /**
   * Converts between beats-per-minute and R-R interval in milliseconds.
   * @param bpmOrRR either beats-per-minute or an R-R interval in msecs
   * @return the corresponding R-R interval in msecs or beats-per-minute
   */
  public static float bpmRR(float bpmOrRR) {
    return (float)MsecsInMin/bpmOrRR;
  }
  
  /**
   * Really simple, just increments the given current variable toward desired
   * by the given increment.
   * Sets to 0 if within increment to avoid oscillating around desired.
   * @param current - in arbitrary units
   * @param desired - in arbitrary units
   * @param inc - in units per second
   * @param timeDelta - time since last set in milliseconds
   * @return
   */
  public static float smoothSet (float current, float desired, float inc,
      long timeDelta) {
    
    /* determine how much increment is needed for the time delta */
    inc *= ((float) timeDelta)/1000.0;
    if (inc < 0)
      inc = -inc;
    
    float diff = current - desired;
    if (diff != 0) {
      if (diff > 0) {
        if (diff < inc)
          current = desired;
        else
          current -= inc;
      }
        
      if (diff < 0) {
        if (-diff < inc)
          current = desired;
        else
          current += inc;
      }
    }
    return current;
  }
}

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