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Java SDK for ConfigCat, a feature flag, feature toggle, and configuration management service. That lets you launch new features and change your software configuration remotely without actually (re)deploying code. ConfigCat even helps you do controlled roll-outs like canary releases and blue-green deployments.

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package com.configcat;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.time.Instant;
import java.util.Date;
import java.util.List;
import java.util.Locale;

final class UserAttributeConverter {

    public static String userAttributeToString(Object userAttribute) {
        if (userAttribute == null) {
            return null;
        }
        if (userAttribute instanceof String) {
            return (String) userAttribute;
        }
        if (userAttribute instanceof String[]) {
            return Utils.gson.toJson(userAttribute);
        }
        if (userAttribute instanceof List) {
            return Utils.gson.toJson(userAttribute);
        }
        if (userAttribute instanceof Date) {
            Date userAttributeDate = (Date) userAttribute;
            return doubleToString(DateTimeUtils.getUnixSeconds(userAttributeDate));
        }
        if (userAttribute instanceof Instant) {
            Instant userAttributeInstant = (Instant) userAttribute;
            return doubleToString(DateTimeUtils.getUnixSeconds(userAttributeInstant));
        }
        if (userAttribute instanceof Float) {
            return doubleToString(((Float) userAttribute).doubleValue());
        }
        if (userAttribute instanceof Double) {
            return doubleToString((Double) userAttribute);
        }
        return userAttribute.toString();
    }

    private static String doubleToString(Double doubleToString) {

        // Handle Double.NaN, Double.POSITIVE_INFINITY and Double.NEGATIVE_INFINITY
        if (doubleToString.isNaN() || doubleToString.isInfinite()) {
            return doubleToString.toString();
        }

        // To get similar result between different SDKs the Double value format is modified.
        // Between 1e-6 and 1e21 we don't use scientific-notation. Over these limits scientific-notation used but the
        // ExponentSeparator replaced with "e" and "e+".
        // "." used as decimal separator in all cases.
        double abs = Math.abs(doubleToString);
        DecimalFormat fmt = 1e-6 <= abs && abs < 1e21
                ? new DecimalFormat("#.#################")
                : new DecimalFormat("#.#################E0");
        DecimalFormatSymbols SYMBOLS = DecimalFormatSymbols.getInstance(Locale.UK);
        if (abs > 1) {
            SYMBOLS.setExponentSeparator("e+");
        } else {
            SYMBOLS.setExponentSeparator("e");
        }
        fmt.setDecimalFormatSymbols(SYMBOLS);
        return fmt.format(doubleToString);
    }

    public static Double userAttributeToDouble(Object userAttribute) {
        if (userAttribute == null) {
            return null;
        }
        if (userAttribute instanceof Double) {
            return (Double) userAttribute;
        }
        if (userAttribute instanceof String) {
            return Double.parseDouble(((String) userAttribute).trim().replace(",", "."));
        }
        if (userAttribute instanceof Integer) {
            return ((Integer) userAttribute).doubleValue();
        }
        if (userAttribute instanceof Float) {
            return ((Float) userAttribute).doubleValue();
        }
        if (userAttribute instanceof Long) {
            return ((Long) userAttribute).doubleValue();
        }
        if (userAttribute instanceof Byte) {
            return ((Byte) userAttribute).doubleValue();
        }
        if (userAttribute instanceof Short) {
            return ((Short) userAttribute).doubleValue();
        }

        throw new NumberFormatException();
    }

}