/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.jmx;

import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.status.StatusUtil;

public class MBeanUtil {

  static final String DOMAIN = "ch.qos.logback.classic";

  static public String getObjectNameFor(String contextName, Class type) {
    return DOMAIN + ":Name=" + contextName + ",Type="
        + type.getName();
  }

  public static ObjectName string2ObjectName(Context context, Object caller,
      String objectNameAsStr) {
    String msg = "Failed to convert [" + objectNameAsStr + "] to ObjectName";

    StatusUtil statusUtil = new StatusUtil(context);
    try {
      return new ObjectName(objectNameAsStr);
    } catch (MalformedObjectNameException e) {
      statusUtil.addError(caller, msg, e);
      return null;
    } catch (NullPointerException e) {
      statusUtil.addError(caller, msg, e);
      return null;
    }
  }

  public static boolean isRegistered(MBeanServer mbs, ObjectName objectName) {
    return mbs.isRegistered(objectName);
  }

  public static void createAndRegisterJMXConfigurator(
      MBeanServer mbs, LoggerContext loggerContext,
      JMXConfigurator jmxConfigurator, ObjectName objectName, Object caller) {
    try {
      mbs.registerMBean(jmxConfigurator, objectName);
    } catch (Exception e) {
      StatusUtil statusUtil = new StatusUtil(loggerContext);
      statusUtil.addError(caller, "Failed to create mbean", e);
    }
  }

  public static void unregister(LoggerContext loggerContext, MBeanServer mbs,
      ObjectName objectName, Object caller) {

    StatusUtil statusUtil = new StatusUtil(loggerContext);
    if (mbs.isRegistered(objectName)) {
      try {
        statusUtil.addInfo(caller, "Unregistering mbean ["
            + objectName + "]");
        mbs.unregisterMBean(objectName);
      } catch (InstanceNotFoundException e) {
        // this is theoretically impossible
        statusUtil.addError(caller, "Failed to unregister mbean"
            + objectName, e);
      } catch (MBeanRegistrationException e) {
        // this is theoretically impossible
        statusUtil.addError(caller, "Failed to unregister mbean"
            + objectName, e);
      }
    } else {
      statusUtil.addInfo(caller, "mbean [" + objectName
          + "] does not seem to be registered");
    }
  }

}
