RangeFunction.h

/*
 * RangeFunction.h
 *
 *  Created on: Jun 8, 2016
 *      Author: ndp
 */
 
#ifndef FUNCTIONS_RANGEFUNCTION_H_
#define FUNCTIONS_RANGEFUNCTION_H_
 
#include <iostream>
 
#include <libdap/ServerFunction.h>
#include <libdap/dods-limits.h>
 
namespace libdap {
class BaseType;
class DDS;
}
 
namespace functions {
 
struct min_max_t {
    double max_val;
    double min_val;
    bool monotonic;
 
    min_max_t() : max_val(-DODS_DBL_MAX), min_val(DODS_DBL_MAX), monotonic(true) { }
 
    friend std::ostream& operator<< (std::ostream& stream, const min_max_t& v) {
        stream << "min: " << v.min_val <<
            ", max: " << v.max_val <<
            ", monotonic: " <<  (v.monotonic?"true":"false") ;
        return stream;
    }
};
 
// These are declared here so they can be tested by RangeFunctionTest.cc in unit-tests.
// jhrg 6/7/17
min_max_t find_min_max(double* data, int length, bool use_missing, double missing);
libdap::BaseType *range_worker(libdap::BaseType *bt, double missing, bool use_missing);

void function_dap2_range(int argc, libdap::BaseType *argv[], libdap::DDS &dds, libdap::BaseType **btpp) ;

libdap::BaseType *function_dap4_range(libdap::D4RValueList *args, libdap::DMR &dmr);

class RangeFunction: public libdap::ServerFunction {
public:
    RangeFunction()
    {
        setName("range");
        setDescriptionString("The range() function evaluates the passed variable and returns an array of size 2 containing the min and max values of the variable.");
        setUsageString("range(var)");
        setRole("http://services.opendap.org/dap4/server-side-function/range");
        setDocUrl("https://docs.opendap.org/index.php/Server_Side_Processing_Functions#range");
        setFunction(function_dap2_range);
        setFunction(function_dap4_range);
        setVersion("1.0b1");
    }
    virtual ~RangeFunction()
    {
    }
};
 
} // functions namespace
 
#endif /* FUNCTIONS_RANGEFUNCTION_H_ */