Query Example

gistfile1.txt

public class FilterMapToDoubleSortedSum extends Processor {

    public Object process(int[] arr, TerminalQueryOperationNode node) {
        // Original Query: C_FILTER->C_MAP_TO_DOUBLE->C_SORTED_NATURAL->CT_MATH_SUM
        // Simplified    : C_FILTER->C_MAP_TO_DOUBLE->CT_MATH_SUM
        
        // Extract all functions from a linked list of query objects
        SI_MapToDouble on = (SI_MapToDouble) node.previous().previous();
        IntToDoubleFunction mapper = on.getMapper();
        
        IntPredicate intPredicate = ((SI_Filter) on.previous()).getIntPredicate();
        
        double sum = 0.0d;
        for (int i = 0; i < arr.length; i++) {
            int e = arr[i];
            if (intPredicate.test(e)) {
                double mapped = mapper.applyAsDouble(e);
                sum += mapped;
            }
        }
        return Double.valueOf(sum);
    }
}