public IBxFormula GetFormula(int srcIndex, int trgIndex)
{
if (srcIndex == trgIndex)
{
return(ParsedFormula.s_sameUnitFormula);
}
_SrcUnitFormulas formulas = m_formulas[srcIndex];
IBxFormula fml = formulas.GetFormula(trgIndex);
if (fml == null)
{
if (trgIndex == m_nDefaultUnitIndex)
{
throw new Exception(string.Format("not find the convertion between {0} to default unit {1} \n", this[srcIndex].ID, this[m_nDefaultUnitIndex].ID));
}
if (srcIndex == m_nDefaultUnitIndex)
{
IBxFormula temp = GetFormula(trgIndex, srcIndex);
if (!(temp is ParsedFormula))
{
throw new Exception(string.Format("It must be a ParsedFormula between {0] to defaultUnit {1}\n", this[trgIndex].ID, this[srcIndex].ID));
}
fml = ParsedFormula.Inverse((ParsedFormula)temp);
formulas.SetFormula(trgIndex, fml);
}
else
{
IBxFormula fml1 = GetFormula(srcIndex, m_nDefaultUnitIndex);
IBxFormula fml2 = GetFormula(m_nDefaultUnitIndex, trgIndex);
fml = new CombinedFormula(fml1, fml2);
formulas.SetFormula(trgIndex, fml);
}
}
return(fml);
}
public IBxFormula GetFormula(int srcIndex, int trgIndex)
{
if (srcIndex == trgIndex)
{
return(ParsedFormula.s_sameUnitFormula);
}
BxSrcUnitFormulas formulas = _formulas[srcIndex];
IBxFormula fml = formulas.GetFormula(trgIndex);
if (fml == null)
{
//取反向的转换关系
ParsedFormula tempFml = _formulas[trgIndex].GetFormula(srcIndex) as ParsedFormula;
if (tempFml != null)
{
fml = ParsedFormula.Inverse(tempFml);
formulas.SetFormula(trgIndex, fml);
}
}
if (fml == null)
{
if ((trgIndex == _nDefaultUnitIndex) || (srcIndex == _nDefaultUnitIndex))
{
throw new Exception(string.Format("缺乏单位{0}和主单位{1}之间的转换关系\n", this[srcIndex].ID, this[trgIndex].ID));
}
else
{
IBxFormula fml1 = GetFormula(srcIndex, _nDefaultUnitIndex);
IBxFormula fml2 = GetFormula(_nDefaultUnitIndex, trgIndex);
fml = new CombinedFormula(fml1, fml2);
formulas.SetFormula(trgIndex, fml);
}
}
return(fml);
}
public static ParsedFormula Inverse(ParsedFormula formula)
{
return(new ParsedFormula(Inverse(formula.m_rootItem)));
}
static ParsedFormula()
{
s_sameUnitFormula = new ParsedFormula(new BUParsedVariant());
}