/*+
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.+
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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 *+
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 * This code is free software; you can redistribute it and/or modify it+
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 * under the terms of the GNU General Public License version 2 only, as+
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 * published by the Free Software Foundation.+
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 *+
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 * This code is distributed in the hope that it will be useful, but WITHOUT+
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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 * version 2 for more details (a copy is included in the LICENSE file that+
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 * accompanied this code).+
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 *+
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 * You should have received a copy of the GNU General Public License version+
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 * 2 along with this work; if not, write to the Free Software Foundation,+
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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 *+
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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 * or visit www.oracle.com if you need additional information or have any+
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 * questions.+
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 *+
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 */+
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#ifndef SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP+
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#define SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP+
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+
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#include "logging/logConfiguration.hpp"+
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#include "logging/logLevel.hpp"+
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#include "logging/logTag.hpp"+
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#include "memory/allocation.hpp"+
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#include "utilities/debug.hpp"+
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#include "utilities/globalDefinitions.hpp"+
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+
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class LogTagSet;+
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+
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// Class used to temporary encode a 'what'-expression during log configuration.+
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// Consists of a combination of tags and levels, e.g. "tag1+tag2=level1,tag3*=level2".+
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class LogTagLevelExpression : public StackObj {+
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 public:+
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  static const size_t MaxCombinations = 256;+
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+
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 private:+
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  friend void LogConfiguration::configure_stdout(LogLevelType, bool, ...);+
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+
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  static const char* DefaultExpressionString;+
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+
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  size_t        _ntags, _ncombinations;+
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  LogTagType    _tags[MaxCombinations][LogTag::MaxTags];+
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  LogLevelType  _level[MaxCombinations];+
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  bool          _allow_other_tags[MaxCombinations];+
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+
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  void new_combination() {+
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    // Make sure either all tags are set or the last tag is __NO_TAG+
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    if (_ntags < LogTag::MaxTags) {+
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      _tags[_ncombinations][_ntags] = LogTag::__NO_TAG;+
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    }+
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+
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    _ncombinations++;+
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    _ntags = 0;+
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  }+
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+
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  bool add_tag(LogTagType tag) {+
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    assert(_ntags < LogTag::MaxTags, "Can't have more tags than MaxTags!");+
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    for (size_t i = 0; i < _ntags; i++) {+
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      if (_tags[_ncombinations][i] == tag) {+
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        return false;+
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      }+
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    }+
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    _tags[_ncombinations][_ntags++] = tag;+
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    return true;+
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  }+
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+
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  void set_level(LogLevelType level) {+
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    _level[_ncombinations] = level;+
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  }+
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+
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  void set_allow_other_tags() {+
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    _allow_other_tags[_ncombinations] = true;+
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  }+
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+
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 public:+
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  LogTagLevelExpression() : _ntags(0), _ncombinations(0) {+
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    for (size_t combination = 0; combination < MaxCombinations; combination++) {+
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      _level[combination] = LogLevel::Invalid;+
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      _allow_other_tags[combination] = false;+
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      _tags[combination][0] = LogTag::__NO_TAG;+
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    }+
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  }+
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+
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  bool parse(const char* str, outputStream* errstream = NULL);+
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  LogLevelType level_for(const LogTagSet& ts) const;+
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+
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  // Verify the tagsets/selections mentioned in this expression.+
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  // Returns false if some invalid tagset was found. If given an outputstream,+
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  // this function will list all the invalid selections on the stream.+
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  bool verify_tagsets(outputStream* out = NULL) const;+
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};+
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+
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#endif // SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP+
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