question: public static long toLongValue ( String str ) throws PageException { BigInteger bi = null ; try { bi = new BigInteger ( str ) ; } catch ( Throwable t ) { } if ( bi != null ) { if ( bi . bitLength ( ) < 64 ) return bi . longValue ( ) ; throw new ApplicationException ( "number [" + str + "] cannot be casted to a long value, number is to long (" + ( bi . bitLength ( ) + 1 ) + " bit)" ) ; } return ( long ) toDoubleValue ( str ) ; }
target:  cast a Object to a long value (primitive value type)