Logging to j.u.Logger from JNI

logging.h

#ifndef __LOGGING_H__
#define __LOGGING_H__

#include <jni.h>

typedef enum {
  SEVERE = 0,
  WARNING,
  INFO,
  FINE,
  FINER,
  FINEST
} log_level_t;

static jmethodID log_method_table[6];

#define JU_LOG(env, logger, level, msg) \
  (*env)->CallVoidMethod(env, logger, log_method_table[level], (*env)->NewStringUTF(env, msg))

#define LOG_SEVERE(env, logger, msg) JU_LOG(env, logger, SEVERE, msg)
#define LOG_WARNING(env, logger, msg) JU_LOG(env, logger, WARNING, msg)
#define LOG_INFO(env, logger, msg) JU_LOG(env, logger, INFO, msg)

#ifdef DEBUG

#define LOG_FINE(env, logger, msg) JU_LOG(env, logger, FINE, msg)
#define LOG_FINER(env, logger, msg) JU_LOG(env, logger, FINER, msg)
#define LOG_FINEST(env, logger, msg) JU_LOG(env, logger, FINEST, msg)

#else

#define LOG_FINE(env, logger, msg)
#define LOG_FINER(env, logger, msg)
#define LOG_FINEST(env, logger, msg)

#endif

static void init_logging(JNIEnv *env)
{
  jclass logger_class = (*env)->FindClass(env, "java/util/logging/Logger");
  log_method_table[SEVERE] = (*env)->GetMethodID(env, logger_class, "severe", "(Ljava/lang/String;)V");
  log_method_table[WARNING] = (*env)->GetMethodID(env, logger_class, "warning", "(Ljava/lang/String;)V");
  log_method_table[INFO] = (*env)->GetMethodID(env, logger_class, "info", "(Ljava/lang/String;)V");
  log_method_table[FINE] = (*env)->GetMethodID(env, logger_class, "fine", "(Ljava/lang/String;)V");
  log_method_table[FINER] = (*env)->GetMethodID(env, logger_class, "finer", "(Ljava/lang/String;)V");
  log_method_table[FINEST] = (*env)->GetMethodID(env, logger_class, "finest", "(Ljava/lang/String;)V");
}

#endif