static cv_converter*
trivialClone(
cv_converter* const conv)
{
(void)conv;
return cv_get_trivial();
}
// CONSTRUCTOR
DPC_UnitConvDataStream::DPC_UnitConvDataStream(DataStream* ds, const char *ToUnits, const char *FromUnitsHint ) {
ut_unit * to = NULL ;
ut_unit * from = NULL ;
const char * recorded_units = ds->getUnit().c_str();
source_ds = ds;
if (ToUnits != NULL) {
to = ut_parse(u_system, ToUnits, UT_ASCII) ;
to_units = ToUnits ;
}
// If the user has specified a units conversion and those units are valid ...
if ( to != NULL ) {
// If the recorded data file doesn't contain the units in which the data is recorded ...
if ((recorded_units == NULL) || (strcmp(recorded_units,"") == 0)) {
// If the user didn't give us a hint as to what the units are (using var@from_units) ...
if ((FromUnitsHint == NULL) || (strcmp(FromUnitsHint,"") == 0)) {
// set the from units to the same as the to units.
cf = cv_get_trivial() ;
std::cerr << "ERROR: Unable to to perform units conversion"
<< " because the recorded data doesn't indicate it's"
<< " units and no @from_units hint is provided."
<< std::endl;
std::cerr.flush();
} else { // the user did give us a hint.
from = ut_parse(u_system, FromUnitsHint, UT_ASCII) ;
if ( ! from ) {
std::cerr << "ERROR: Unable to to perform units conversion"
<< " because the recorded data doesn't indicate it's"
<< " units and although a @from_units hint is provided ("
<< "(\"" << FromUnitsHint << "\"), they are invalid."
<< std::endl;
std::cerr.flush();
}
}
} else { // the recorded data file does "know" the units in which the data was recorded,
// so those will be the units that we convert from.
from = ut_parse(u_system, recorded_units, UT_ASCII) ;
if ( !from ) {
std::cerr << "ERROR: Unable to to perform units conversion because the"
<< " units in the data recording file appear to be corrupt."
<< std::endl;
std::cerr.flush();
}
}
// If we know what units the data was recorded in ...
if ( from != NULL ) {
cf = ut_get_converter(from,to) ;
if ( cf == NULL ) {
std::cerr << "ERROR: Unable to convert from \"" << FromUnitsHint << "\" to \""
<< to_units << "\" because they are incompatible." << std::endl;
std::cerr.flush();
cf = cv_get_trivial() ;
}
} else {
std::cerr << "ERROR: Unable to perform units conversion becuase the units"
<< " that the data is recorded in is unknown." << std::endl;
cf = cv_get_trivial() ;
}
} else { // The user has not specified a units conversion or the units were not valid.
// If the recorded data file doesn't contain the units in which the data is recorded ...
if ((recorded_units == NULL) || (strcmp(recorded_units,"") == 0)) {
// If the user didn't give us a hint as to what the units are (using var@from_units) ...
if ((FromUnitsHint == NULL) || (strcmp(FromUnitsHint,"") == 0)) {
cf = cv_get_trivial() ;
} else { // the user did give us a hint.
to_units = FromUnitsHint ;
cf = cv_get_trivial() ;
}
} else { // the recorded data file does "know" the units in which the data was recorded,
to_units = recorded_units ;
cf = cv_get_trivial() ;
}
}
if (to) ut_free(to) ;
if (from) ut_free(from) ;
this->begin();
}
/*
* Returns a converter corresponding to the sequential application of two
* other converters. The returned converter should be passed to cv_free() when
* it is no longer needed.
*
* Arguments:
* first The converter to be applied first. May be passed to cv_free()
* upon return.
* second The converter to be applied second. May be passed to cv_free()
* upon return.
* Returns:
* NULL Either "first" or "second" is NULL or necessary memory couldn't
* be allocated.
* else A converter corresponding to the sequential application of the
* given converters. If one of the input converters is the trivial
* converter, then the returned converter will be the other input
* converter.
*/
cv_converter*
cv_combine(
cv_converter* const first,
cv_converter* const second)
{
cv_converter* conv;
if (first == NULL || second == NULL) {
conv = NULL;
}
else if (IS_TRIVIAL(first)) {
conv = CV_CLONE(second);
}
else if (IS_TRIVIAL(second)) {
conv = CV_CLONE(first);
}
else {
conv = NULL;
if (IS_RECIPROCAL(first)) {
if (IS_RECIPROCAL(second)) {
conv = cv_get_trivial();
}
}
else if (IS_SCALE(first)) {
if (IS_SCALE(second)) {
conv = cv_get_scale(first->scale.value * second->scale.value);
}
else if (IS_OFFSET(second)) {
conv = cv_get_galilean(first->scale.value, second->offset.value);
}
else if (IS_GALILEAN(second)) {
conv = cv_get_galilean(
first->scale.value * second->galilean.slope,
second->galilean.intercept);
}
}
else if (IS_OFFSET(first)) {
if (IS_SCALE(second)) {
conv = cv_get_galilean(second->scale.value,
first->offset.value * second->scale.value);
}
else if (IS_OFFSET(second)) {
conv = cv_get_offset(first->offset.value + second->offset.value);
}
else if (IS_GALILEAN(second)) {
conv = cv_get_galilean(second->galilean.slope,
first->offset.value * second->galilean.slope +
second->galilean.intercept);
}
}
else if (IS_GALILEAN(first)) {
if (IS_SCALE(second)) {
conv = cv_get_galilean(
second->scale.value * first->galilean.slope,
second->scale.value * first->galilean.intercept);
}
else if (IS_OFFSET(second)) {
conv = cv_get_galilean(first->galilean.slope,
first->galilean.intercept + second->offset.value);
}
else if (IS_GALILEAN(second)) {
conv = cv_get_galilean(
second->galilean.slope * first->galilean.slope,
second->galilean.slope * first->galilean.intercept +
second->galilean.intercept);
}
}
if (conv == NULL) {
/*
* General case: create a composite converter.
*/
cv_converter* c1 = CV_CLONE(first);
int error = 1;
if (c1 != NULL) {
cv_converter* c2 = CV_CLONE(second);
if (c2 != NULL) {
conv = malloc(sizeof(CompositeConverter));
if (conv != NULL) {
conv->composite.ops = &compositeOps;
conv->composite.first = c1;
conv->composite.second = c2;
error = 0;
} /* "conv" allocated */
if (error)
cv_free(c2);
} /* "c2" allocated */
if (error)
cv_free(c1);
} /* "c1" allocated */
} /* "conv != NULL" */
} /* "first" & "second" not trivial */
return conv;
}