package module.decode.p25.reference;
public class P25NetworkCallsign
{
public static final String[] RADIX_50 = new String[]
{ " ", "A", "B", "C", "D", "E", "F", "G",
"H", "I", "J", "K", "L", "M", "N", "O",
"P", "Q", "R", "S", "T", "U", "V", "W",
"X", "Y", "Z", "$", ".", "?", "0", "1",
"2", "3", "4", "5", "6", "7", "8", "9" };
/**
* Decodes the string callsign from which the WACN and System identifiers
* were derived.
*
* Based on code by Eric Carlson at:
* http://www.ericcarlson.net/project-25-callsign.html
*
* @param wacn
* @param systemID
* @return
*/
public static String getCallsign( int wacn, int systemID )
{
int n1 = wacn / 16;
int n2 = 4096 * ( wacn % 16 ) + systemID;
StringBuilder sb = new StringBuilder();
sb.append( getLetter( (int)( n1 / 1600 ) ) );
sb.append( getLetter( (int)( ( n1 / 40 ) % 40 ) ) );
sb.append( getLetter( (int)( n1 % 40 ) ) );
sb.append( getLetter( (int)( n2 / 1600 ) ) );
sb.append( getLetter( (int)( ( n2 / 40 ) % 40 ) ) );
sb.append( getLetter( (int)( n2 % 40 ) ) );
return sb.toString();
}
private static String getLetter( int value )
{
if( 0 <= value && value < 40 )
{
return RADIX_50[ value ];
}
return " ";
}
}