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H2O GenModel
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package hex.genmodel.utils;

/**
 * Helper function for parsing the serialized model.
 */
public class ParseUtils {
    public static double[] parseArrayOfDoubles(String input) {
        if (!(input.startsWith("[") && input.endsWith("]")))
            throw new NumberFormatException("Array should be enclosed in square brackets");
        String[] parts = input.substring(1, input.length()-1).split(",");
        double[] res = new double[parts.length];
        for (int i = 0; i < parts.length; i++)
            res[i] = Double.parseDouble(parts[i].trim());
        return res;
    }

    public static long[] parseArrayOfLongs(String input) {
        if (!(input.startsWith("[") && input.endsWith("]")))
            throw new NumberFormatException("Array should be enclosed in square brackets");
        String[] parts = input.substring(1, input.length()-1).split(",");
        long[] res = new long[parts.length];
        for (int i = 0; i < parts.length; i++)
            res[i] = Long.parseLong(parts[i].trim());
        return res;
    }

    public static int[] parseArrayOfInts(String input) {
        if (!(input.startsWith("[") && input.endsWith("]")))
            throw new NumberFormatException("Array should be enclosed in square brackets");
        String[] parts = input.substring(1, input.length()-1).split(",");
        int[] res = new int[parts.length];
        for (int i = 0; i < parts.length; i++)
            res[i] = Integer.parseInt(parts[i].trim());
        return res;
    }
    
    // return value type and defValue type don't match, parsed result has different type
    // e.g. when using new Long[0] as default value to obtain result of type Long[], parsed value is of type long[]
    // when using new long[0] as default value to obtain result of type long[], parsed value is of type int[]
    public static Object tryParse(String input, Object defVal) {
        if (input.equals("null")) return defVal;

        if (input.equals("true")) return true;
        if (input.equals("false")) return false;

        if (defVal != null && !(defVal.getClass().isArray())) {
            if (defVal instanceof Boolean)     // parse according to data type of defVal
                return Boolean.valueOf(input);
            else if (defVal instanceof Long)
                return Long.valueOf(input);
            else if (defVal instanceof Integer)
                return Integer.valueOf(input);
            else if (defVal instanceof Float)
                return Float.valueOf(input);
            else if (defVal instanceof Double)
                return Double.valueOf(input);
        }

        if (defVal != null && (defVal.getClass().isArray())) {
            if (defVal instanceof Long[])
                return parseArrayOfLongs(input);
            else if (defVal instanceof Integer[])
                return parseArrayOfInts(input);
            else if (defVal instanceof Double[])
                return parseArrayOfDoubles(input);
        }

        if ("[]".equals(input) && (defVal != null) && defVal.getClass().isArray())
            return defVal;

        try { return Integer.parseInt(input); }
        catch (NumberFormatException e) {
            if ((defVal instanceof Number) && !(defVal instanceof Double || defVal instanceof Float || defVal instanceof Long))
                throw e; // integer number expected but couldn't be parsed
        }

        try { return Long.parseLong(input); }
        catch (NumberFormatException e) {
            if (defVal instanceof Number && !(defVal instanceof Double))
                throw e; // number expected but couldn't be parsed
        }

        try { return Double.parseDouble(input); }
        catch (NumberFormatException e) {
            if (defVal instanceof Number)
                throw e; // number expected but couldn't be parsed
        }

        try { return parseArrayOfInts(input); }
        catch (NumberFormatException e) {
            if (defVal instanceof int[]) throw e; // int array expected
        }

        try { return parseArrayOfLongs(input); }
        catch (NumberFormatException e) {
            if (defVal instanceof long[]) throw e; // long array expected
        }

        try { return parseArrayOfDoubles(input); }
        catch (NumberFormatException e) {
            if (defVal instanceof double[]) throw e; // double array expected
        }

        return input;
    }
}