84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
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* Copyright (C) 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_DYNAMIC_PT_READING_UTILS_H
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#define LATINIME_DYNAMIC_PT_READING_UTILS_H
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#include <cstdint>
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#include "defines.h"
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namespace latinime {
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class DynamicPtReadingUtils {
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public:
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typedef uint8_t NodeFlags;
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static const int DICT_OFFSET_INVALID;
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static const int DICT_OFFSET_ZERO_OFFSET;
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static int getForwardLinkPosition(const uint8_t *const buffer, const int pos);
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static AK_FORCE_INLINE bool isValidForwardLinkPosition(const int forwardLinkAddress) {
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return forwardLinkAddress != 0;
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}
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static int getParentPtNodePosOffsetAndAdvancePosition(const uint8_t *const buffer,
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int *const pos);
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static int getParentPtNodePos(const int parentOffset, const int ptNodePos);
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static int readChildrenPositionAndAdvancePosition(const uint8_t *const buffer, int *const pos);
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/**
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* Node Flags
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*/
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static AK_FORCE_INLINE bool isMoved(const NodeFlags flags) {
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return FLAG_IS_MOVED == (MASK_MOVED & flags);
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}
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static AK_FORCE_INLINE bool isDeleted(const NodeFlags flags) {
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return FLAG_IS_DELETED == (MASK_MOVED & flags);
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}
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static AK_FORCE_INLINE bool willBecomeNonTerminal(const NodeFlags flags) {
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return FLAG_WILL_BECOME_NON_TERMINAL == (MASK_MOVED & flags);
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}
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static AK_FORCE_INLINE NodeFlags updateAndGetFlags(const NodeFlags originalFlags,
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const bool isMoved, const bool isDeleted, const bool willBecomeNonTerminal) {
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NodeFlags flags = originalFlags;
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flags = willBecomeNonTerminal ?
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((flags & (~MASK_MOVED)) | FLAG_WILL_BECOME_NON_TERMINAL) : flags;
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flags = isMoved ? ((flags & (~MASK_MOVED)) | FLAG_IS_MOVED) : flags;
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flags = isDeleted ? ((flags & (~MASK_MOVED)) | FLAG_IS_DELETED) : flags;
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flags = (!isMoved && !isDeleted && !willBecomeNonTerminal) ?
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((flags & (~MASK_MOVED)) | FLAG_IS_NOT_MOVED) : flags;
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return flags;
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPtReadingUtils);
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static const NodeFlags MASK_MOVED;
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static const NodeFlags FLAG_IS_NOT_MOVED;
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static const NodeFlags FLAG_IS_MOVED;
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static const NodeFlags FLAG_IS_DELETED;
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static const NodeFlags FLAG_WILL_BECOME_NON_TERMINAL;
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};
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} // namespace latinime
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#endif /* LATINIME_DYNAMIC_PT_READING_UTILS_H */
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