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Diffstat (limited to 'storage/mroonga/vendor/groonga/lib/dat/base.hpp')
-rw-r--r-- | storage/mroonga/vendor/groonga/lib/dat/base.hpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/lib/dat/base.hpp b/storage/mroonga/vendor/groonga/lib/dat/base.hpp new file mode 100644 index 00000000000..577e69ed62d --- /dev/null +++ b/storage/mroonga/vendor/groonga/lib/dat/base.hpp @@ -0,0 +1,69 @@ +/* -*- c-basic-offset: 2 -*- */ +/* Copyright(C) 2011 Brazil + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License version 2.1 as published by the Free Software Foundation. + + This library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +#ifndef GRN_DAT_BASE_HPP_ +#define GRN_DAT_BASE_HPP_ + +#include "dat.hpp" + +namespace grn { +namespace dat { + +// The most significant bit represents whether or not the node is a linker. +// BASE of a linker represents the position of its associated key and BASE of +// a non-linker represents the offset to its child nodes. +class GRN_DAT_API Base { + public: + Base() : value_(0) {} + + bool operator==(const Base &rhs) const { + return value_ == rhs.value_; + } + + bool is_linker() const { + return (value_ & IS_LINKER_FLAG) == IS_LINKER_FLAG; + } + UInt32 offset() const { + GRN_DAT_DEBUG_THROW_IF(is_linker()); + return value_; + } + UInt32 key_pos() const { + GRN_DAT_DEBUG_THROW_IF(!is_linker()); + return value_ & ~IS_LINKER_FLAG; + } + + void set_offset(UInt32 x) { + GRN_DAT_DEBUG_THROW_IF((x & IS_LINKER_FLAG) != 0); + GRN_DAT_DEBUG_THROW_IF(x > MAX_OFFSET); + value_ = x; + } + void set_key_pos(UInt32 x) { + GRN_DAT_DEBUG_THROW_IF((x & IS_LINKER_FLAG) != 0); + GRN_DAT_DEBUG_THROW_IF(x > MAX_OFFSET); + value_ = IS_LINKER_FLAG | x; + } + + private: + UInt32 value_; + + static const UInt32 IS_LINKER_FLAG = 0x80000000U; +}; + +} // namespace dat +} // namespace grn + +#endif // GRN_DAT_BASE_HPP_ |