package com.linkedin.util;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.io.InputStream;
import java.util.Optional;
import java.util.Properties;

public class Configuration {

    private Configuration() {
    }

    @Nonnull
    public static Properties loadProperties(@Nonnull String configFile) {
        Properties configuration = new Properties();
        try (InputStream inputStream = Configuration.class.getClassLoader().getResourceAsStream(configFile)) {
            configuration.load(inputStream);
        } catch (IOException e) {
            throw new RuntimeException("Can't read file: " + configFile);
        }
        return configuration;
    }

    @Nonnull
    public static String getEnvironmentVariable(@Nonnull String envVar) {
        return System.getenv(envVar);
    }

    @Nonnull
    public static String getEnvironmentVariable(@Nonnull String envVar, @Nonnull String defaultVal) {
        return Optional.ofNullable(System.getenv(envVar)).orElse(defaultVal);
    }
}