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/*
Copyright(C) 2011-2016 Brazil
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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
*/
#pragma once
#include "cursor.hpp"
#include "vector.hpp"
namespace grn {
namespace dat {
class Trie;
class GRN_DAT_API PredictiveCursor : public Cursor {
public:
PredictiveCursor();
~PredictiveCursor();
void open(const Trie &trie,
const String &str,
UInt32 offset = 0,
UInt32 limit = MAX_UINT32,
UInt32 flags = 0);
void close() override;
const Key &next() override;
UInt32 offset() const override {
return offset_;
}
UInt32 limit() const override {
return limit_;
}
UInt32 flags() const override {
return flags_;
}
private:
const Trie *trie_;
UInt32 offset_;
UInt32 limit_;
UInt32 flags_;
Vector<UInt32> buf_;
UInt32 cur_;
UInt32 end_;
UInt32 min_length_;
PredictiveCursor(const Trie &trie,
UInt32 offset, UInt32 limit, UInt32 flags);
UInt32 fix_flags(UInt32 flags) const;
void init(const String &str);
void swap(PredictiveCursor *cursor);
const Key &ascending_next();
const Key &descending_next();
static const UInt32 IS_ROOT_FLAG = 0x80000000U;
static const UInt32 POST_ORDER_FLAG = 0x80000000U;
// Disallows copy and assignment.
PredictiveCursor(const PredictiveCursor &);
PredictiveCursor &operator=(const PredictiveCursor &);
};
} // namespace dat
} // namespace grn
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