/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_LOGGING_LOGHANDLE_HPP

#define SHARE_VM_LOGGING_LOGHANDLE_HPP

#include "logging/log.hpp"

// Wraps a Log instance and throws away the template information.

//

// This can be used to pass a Log instance as a parameter without

// polluting the surrounding API with template functions.

class LogHandle {

private:

  LogTagSet* _tagset;

public:

  template <LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag>

  LogHandle(const LogImpl<T0, T1, T2, T3, T4, GuardTag>& type_carrier) :

      _tagset(&LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {}

  bool is_level(LogLevelType level) {

    return _tagset->is_level(level);

  }

#define LOG_LEVEL(level, name) ATTRIBUTE_PRINTF(2, 0)   \

  LogHandle& v##name(const char* fmt, va_list args) { \

    _tagset->vwrite(LogLevel::level, fmt, args); \

    return *this; \

  } \

  LogHandle& name(const char* fmt, ...) ATTRIBUTE_PRINTF(2, 3) { \

    va_list args; \

    va_start(args, fmt); \

    _tagset->vwrite(LogLevel::level, fmt, args); \

    va_end(args); \

    return *this; \

  } \

  bool is_##name() { \

    return _tagset->is_level(LogLevel::level); \

  }

  LOG_LEVEL_LIST

#undef LOG_LEVEL

};

// Wraps a LogTarget instance and throws away the template information.

//

// This can be used to pass a Log instance as a parameter without

// polluting the surrounding API with template functions.

class LogTargetHandle {

private:

  const LogLevelType _level;

  LogTagSet*         _tagset;

public:

  LogTargetHandle(LogLevelType level, LogTagSet* tagset) : _level(level), _tagset(tagset) {}

  template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag>

  LogTargetHandle(const LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>& type_carrier) :

      _level(level),

      _tagset(&LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {}

  template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag>

  static LogTargetHandle create() {

    return LogTargetHandle(LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>());

  }

  void print(const char* fmt, ...) ATTRIBUTE_PRINTF(2, 3) {

    va_list args;

    va_start(args, fmt);

    _tagset->vwrite(_level, fmt, args);

    va_end(args);

  }

  bool is_enabled() const {

    return _tagset->is_level(_level);

  }

  // Creates a log stream from the information stored in this instance.

  // Callers need a ResourceMark on the stack.

  outputStream* stream() {

    return create_log_stream(_level, _tagset);;

  }

};

#endif // SHARE_VM_LOGGING_LOGHANDLE_HPP