SystemUtils.java

package datadog.trace.bootstrap;

public final class SystemUtils {
  private SystemUtils() {}

  public static String tryGetEnv(String envVar) {
    return getEnvOrDefault(envVar, null);
  }

  public static String getEnvOrDefault(String envVar, String defaultValue) {
    try {
      return System.getenv(envVar);
    } catch (SecurityException e) {
      return defaultValue;
    }
  }

  public static String tryGetProperty(String property) {
    try {
      return System.getProperty(property);
    } catch (SecurityException e) {
      return null;
    }
  }

  public static String trySetProperty(String property, String value) {
    try {
      return System.setProperty(property, value);
    } catch (SecurityException e) {
      return null;
    }
  }

  public static String getPropertyOrDefault(String property, String defaultValue) {
    try {
      return System.getProperty(property, defaultValue);
    } catch (SecurityException e) {
      return defaultValue;
    }
  }

  private static String toEnvVar(String string) {
    return string.replace('.', '_').replace('-', '_').toUpperCase();
  }

  public static String getPropertyOrEnvVar(String property) {
    String envVarValue = System.getenv(toEnvVar(property));
    if (envVarValue != null) {
      return envVarValue;
    }
    return System.getProperty(property);
  }
}