/*

 * Copyright (c) 2015, 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

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 */

#ifndef SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP

#define SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP

#include "logging/logConfiguration.hpp"

#include "logging/logLevel.hpp"

#include "logging/logTag.hpp"

#include "memory/allocation.hpp"

#include "utilities/debug.hpp"

#include "utilities/globalDefinitions.hpp"

class LogTagSet;

// Class used to temporary encode a 'what'-expression during log configuration.

// Consists of a combination of tags and levels, e.g. "tag1+tag2=level1,tag3*=level2".

class LogTagLevelExpression : public StackObj {

 public:

  static const size_t MaxCombinations = 256;

 private:

  static const char* DefaultExpressionString;

  size_t        _ntags, _ncombinations;

  LogTagType    _tags[MaxCombinations][LogTag::MaxTags];

  LogLevelType  _level[MaxCombinations];

  bool          _allow_other_tags[MaxCombinations];

  void new_combination() {

    // Make sure either all tags are set or the last tag is __NO_TAG

    if (_ntags < LogTag::MaxTags) {

      _tags[_ncombinations][_ntags] = LogTag::__NO_TAG;

    }

    _ncombinations++;

    _ntags = 0;

  }

  bool add_tag(LogTagType tag) {

    assert(_ntags < LogTag::MaxTags, "Can't have more tags than MaxTags!");

    for (size_t i = 0; i < _ntags; i++) {

      if (_tags[_ncombinations][i] == tag) {

        return false;

      }

    }

    _tags[_ncombinations][_ntags++] = tag;

    return true;

  }

  void set_level(LogLevelType level) {

    _level[_ncombinations] = level;

  }

  void set_allow_other_tags() {

    _allow_other_tags[_ncombinations] = true;

  }

 public:

  LogTagLevelExpression() : _ntags(0), _ncombinations(0) {

    for (size_t combination = 0; combination < MaxCombinations; combination++) {

      _level[combination] = LogLevel::Invalid;

      _allow_other_tags[combination] = false;

      _tags[combination][0] = LogTag::__NO_TAG;

    }

  }

  bool parse(const char* str, outputStream* errstream = NULL);

  LogLevelType level_for(const LogTagSet& ts) const;

  // Verify the tagsets/selections mentioned in this expression.

  // Returns false if some invalid tagset was found. If given an outputstream,

  // this function will list all the invalid selections on the stream.

  bool verify_tagsets(outputStream* out = NULL) const;

};

#endif // SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP