/*

 * Copyright (c) 2015, 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_LOGTAGSET_HPP

#define SHARE_VM_LOGGING_LOGTAGSET_HPP

#include "logging/logDecorators.hpp"

#include "logging/logLevel.hpp"

#include "logging/logOutputList.hpp"

#include "logging/logPrefix.hpp"

#include "logging/logTag.hpp"

#include "utilities/globalDefinitions.hpp"

// The tagset represents a combination of tags that occur in a log call somewhere.

// Tagsets are created automatically by the LogTagSetMappings and should never be

// instantiated directly somewhere else.

class LogTagSet VALUE_OBJ_CLASS_SPEC {

 private:

  static LogTagSet* _list;

  static size_t     _ntagsets;

  LogTagSet* const  _next;

  size_t            _ntags;

  LogTagType        _tag[LogTag::MaxTags];

  LogOutputList     _output_list;

  LogDecorators     _decorators;

  typedef size_t (*PrefixWriter)(char* buf, size_t size);

  PrefixWriter      _write_prefix;

  // Keep constructor private to prevent incorrect instantiations of this class.

  // Only LogTagSetMappings can create/contain instances of this class.

  // The constructor links all tagsets together in a global list of tagsets.

  // This list is used during configuration to be able to update all tagsets

  // and their configurations to reflect the new global log configuration.

  LogTagSet(PrefixWriter prefix_writer, LogTagType t0, LogTagType t1, LogTagType t2, LogTagType t3, LogTagType t4);

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

  friend class LogTagSetMapping;

 public:

  static LogTagSet* first() {

    return _list;

  }

  static size_t ntagsets() {

    return _ntagsets;

  }

  LogTagSet* next() {

    return _next;

  }

  size_t ntags() const {

    return _ntags;

  }

  LogTagType tag(size_t idx) const {

    return _tag[idx];

  }

  bool contains(LogTagType tag) const {

    for (size_t i = 0; _tag[i] != LogTag::__NO_TAG; i++) {

      if (tag == _tag[i]) {

        return true;

      }

    }

    return false;

  }

  LogLevelType level_for(const LogOutput* output) const {

    return _output_list.level_for(output);

  }

  void set_output_level(LogOutput* output, LogLevelType level) {

    _output_list.set_output_level(output, level);

  }

  // Refresh the decorators for this tagset to contain the decorators for all

  // of its current outputs combined with the given decorators.

  void update_decorators(const LogDecorators& decorator = LogDecorators::None);

  int label(char *buf, size_t len, const char* separator = ",") const;

  bool has_output(const LogOutput* output);

  // The implementation of this function is put here to ensure

  // that it is inline:able by the log_is_enabled(level, ...) macro.

  bool is_level(LogLevelType level) const {

    return _output_list.is_level(level);

  }

  void log(LogLevelType level, const char* msg);

  ATTRIBUTE_PRINTF(3, 4)

  void write(LogLevelType level, const char* fmt, ...);

  template <LogLevelType Level>

  ATTRIBUTE_PRINTF(2, 3)

  void write(const char* fmt, ...) {

    va_list args;

    va_start(args, fmt);

    vwrite(Level, fmt, args);

    va_end(args);

  }

  ATTRIBUTE_PRINTF(3, 0)

  void vwrite(LogLevelType level, const char* fmt, va_list args);

};

template <LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG,

          LogTagType T3 = LogTag::__NO_TAG, LogTagType T4 = LogTag::__NO_TAG,

          LogTagType GuardTag = LogTag::__NO_TAG>

class LogTagSetMapping : public AllStatic {

private:

  // Verify number of logging tags does not exceed maximum supported.

  STATIC_ASSERT(GuardTag == LogTag::__NO_TAG);

  static LogTagSet _tagset;

public:

  static LogTagSet& tagset() {

    return _tagset;

  }

};

// Instantiate the static field _tagset for all tagsets that are used for logging somewhere.

// (This must be done here rather than the .cpp file because it's a template.)

// Each combination of tags used as template arguments to the Log class somewhere (via macro or not)

// will instantiate the LogTagSetMapping template, which in turn creates the static field for that

// tagset. This _tagset contains the configuration for those tags.

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

LogTagSet LogTagSetMapping<T0, T1, T2, T3, T4, GuardTag>::_tagset(&LogPrefix<T0, T1, T2, T3, T4>::prefix, T0, T1, T2, T3, T4);

#endif // SHARE_VM_LOGGING_LOGTAGSET_HPP