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Sailor for JVM

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package io.elastic.sailor;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonSyntaxException;

class Utils {

    public static boolean isJsonObject(String input) {
        try {
            new Gson().fromJson(input, Object.class);
            return true;
        } catch (JsonSyntaxException e) {
            return false;
        }
    }

    public static boolean isJsonObject(JsonElement element) {
        return element != null && element.isJsonObject();
    }


    public static String getEnvVar(final String key) {
        final String value = getOptionalEnvVar(key);

        if (value == null) {
            throw new IllegalStateException(
                    String.format("Env var '%s' is required", key));
        }

        return value;
    }

    public static String getOptionalEnvVar(final String key) {
        String value = System.getenv(key);

        if (value == null) {
            value = System.getProperty(key);
        }

        return value;
    }
}