FloatValue.cpp

00001 /*
00002  * FloatValue.cpp
00003  *
00004  * Created on: Nov 1, 2013
00005  * * Authors: Vincent Wochnik <v.wochnik@gmail.com>
00006  *
00007  * Copyright (c) 2013 Cumulocity GmbH
00008  *
00009  * Permission is hereby granted, free of charge, to any person obtaining
00010  * a copy of this software and associated documentation files (the
00011  * "Software"), to deal in the Software without restriction, including
00012  * without limitation the rights to use, copy, modify, merge, publish,
00013  * distribute, sublicense, and/or sell copies of the Software, and to
00014  * permit persons to whom the Software is furnished to do so, subject to
00015  * the following conditions:
00016  *
00017  * The above copyright notice and this permission notice shall be
00018  * included in all copies or substantial portions of the Software.
00019  *
00020  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00021  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00022  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00023  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00024  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00025  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00026  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00027  */
00028 
00029 #include "FloatValue.h"
00030 #include <math.h>
00031 
00032 FloatValue::FloatValue(double number, uint8_t digits, bool zflag)
00033 {
00034     _negative = (number < 0.0);
00035     _zflag = zflag;
00036     if (_negative)
00037         _number = -number;
00038     else
00039         _number = number;
00040     _digits = digits;
00041 }
00042 
00043 uint8_t FloatValue::valueType() const
00044 {
00045     return VALUE_FLOAT;
00046 }
00047 
00048 long FloatValue::integerValue() const
00049 {
00050     return 0L;
00051 }
00052 
00053 double FloatValue::floatValue() const
00054 {
00055     return (_negative) ? -_number : _number;
00056 }
00057 
00058 const char * FloatValue::characterValue() const
00059 {
00060     return 0;
00061 }
00062 
00063 size_t FloatValue::write(AbstractDataSink& sink) const
00064 {
00065     size_t n = 0;
00066 
00067     if (isnan(_number)) return sink.write("nan");
00068     if (isinf(_number)) return sink.write("inf");
00069     if (_number > 4294967040.0) return sink.write("ovf");
00070   
00071     if (_negative)
00072         n += sink.write('-');
00073 
00074     double number = _number, rounding = 0.5;
00075     for (uint8_t i = 0; i < _digits; ++i)
00076         rounding /= 10.0;
00077     number += rounding;
00078 
00079     unsigned long int_part = (unsigned long)number;
00080     double remainder = number - (double)int_part;
00081 
00082     if ((_zflag) || (int_part))
00083         n += sink.write(int_part);
00084 
00085     if (_digits == 0)
00086         return n;
00087     n += sink.write("."); 
00088 
00089     uint8_t digits = _digits;
00090     while (digits-- > 0) {
00091         remainder *= 10.0;
00092         unsigned long l = (unsigned long)remainder;
00093         n += sink.write(l);
00094         remainder -= l; 
00095     } 
00096 
00097     return n;
00098 }
00099 
00100 size_t FloatValue::length() const
00101 {
00102     if ((isnan(_number)) || (isinf(_number)) ||
00103             (_number > 4294967040.0))
00104         return 3;
00105 
00106     size_t l = 0;
00107 
00108     if (_negative)
00109         l++;
00110 
00111     double number = _number, rounding = 0.5;
00112     for (uint8_t i = 0; i < _digits; ++i)
00113         rounding /= 10.0;
00114     number += rounding;
00115 
00116     unsigned long n = (unsigned long)number;
00117     if ((_zflag) || (n)) {
00118         do {
00119             n /= 10;
00120             l++;
00121         } while(n);
00122     }
00123 
00124     if (_digits > 0)
00125         l += 1 + _digits;
00126 
00127     return l;
00128 }
00129 
00130 Value* FloatValue::copy() const
00131 {
00132     double number;
00133 
00134     number = (_negative) ? -_number : _number;
00135     return new FloatValue(number, _digits, _zflag);
00136 }
00137