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package Torello.Java;

import Torello.Java.Function.IntDoubleFunction;

class Double1D 
{
    static String toCSV
        (double[] arr, int sPos, int ePos, IntDoubleFunction<String> toString, Integer maxLength)
    {
        LV              l   = new LV(sPos, ePos, arr);
        StringBuilder   sb  = new StringBuilder();
        int             i   = l.start;
        String          s;

        if (toString == null)
        {
            sb.append(arr[i++]);
            while (i < l.end) sb.append(", " + arr[i++]);
        }

        else
        {
            for (; i < l.end; i++)
                if ((s = toString.apply(i, arr[i])).length() > 0)
                    { sb.append(s); break; }

            for (i++; i < l.end; i++)
                if ((s = toString.apply(i, arr[i])) == null)    StrCSV.throwNPE(i, arr[i]);
                else                                            sb.append(", " + s);
        }

        if ((maxLength != null) && (sb.length() > maxLength.intValue()))
        {
            sb.setLength(maxLength - 4);
            sb.append(" ...");

            return sb.toString();
        }
    
        return sb.toString();
    }
}