1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "suggest/core/session/dic_traverse_session.h"
18
19#include "defines.h"
20#include "suggest/core/dictionary/dictionary.h"
21#include "suggest/core/policy/dictionary_header_structure_policy.h"
22#include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
23#include "suggest/core/session/prev_words_info.h"
24
25namespace latinime {
26
27// 256K bytes threshold is heuristically used to distinguish dictionaries containing many unigrams
28// (e.g. main dictionary) from small dictionaries (e.g. contacts...)
29const int DicTraverseSession::DICTIONARY_SIZE_THRESHOLD_TO_USE_LARGE_CACHE_FOR_SUGGESTION =
30        256 * 1024;
31
32void DicTraverseSession::init(const Dictionary *const dictionary,
33        const PrevWordsInfo *const prevWordsInfo, const SuggestOptions *const suggestOptions) {
34    mDictionary = dictionary;
35    mMultiWordCostMultiplier = getDictionaryStructurePolicy()->getHeaderStructurePolicy()
36            ->getMultiWordCostMultiplier();
37    mSuggestOptions = suggestOptions;
38    prevWordsInfo->getPrevWordsTerminalPtNodePos(
39            getDictionaryStructurePolicy(), mPrevWordsPtNodePos, true /* tryLowerCaseSearch */);
40}
41
42void DicTraverseSession::setupForGetSuggestions(const ProximityInfo *pInfo,
43        const int *inputCodePoints, const int inputSize, const int *const inputXs,
44        const int *const inputYs, const int *const times, const int *const pointerIds,
45        const float maxSpatialDistance, const int maxPointerCount) {
46    mProximityInfo = pInfo;
47    mMaxPointerCount = maxPointerCount;
48    initializeProximityInfoStates(inputCodePoints, inputXs, inputYs, times, pointerIds, inputSize,
49            maxSpatialDistance, maxPointerCount);
50}
51
52const DictionaryStructureWithBufferPolicy *DicTraverseSession::getDictionaryStructurePolicy()
53        const {
54    return mDictionary->getDictionaryStructurePolicy();
55}
56
57void DicTraverseSession::resetCache(const int thresholdForNextActiveDicNodes, const int maxWords) {
58    mDicNodesCache.reset(thresholdForNextActiveDicNodes /* nextActiveSize */,
59            maxWords /* terminalSize */);
60    mMultiBigramMap.clear();
61}
62
63void DicTraverseSession::initializeProximityInfoStates(const int *const inputCodePoints,
64        const int *const inputXs, const int *const inputYs, const int *const times,
65        const int *const pointerIds, const int inputSize, const float maxSpatialDistance,
66        const int maxPointerCount) {
67    ASSERT(1 <= maxPointerCount && maxPointerCount <= MAX_POINTER_COUNT_G);
68    mInputSize = 0;
69    for (int i = 0; i < maxPointerCount; ++i) {
70        mProximityInfoStates[i].initInputParams(i, maxSpatialDistance, getProximityInfo(),
71                inputCodePoints, inputSize, inputXs, inputYs, times, pointerIds,
72                maxPointerCount == MAX_POINTER_COUNT_G
73                /* TODO: this is a hack. fix proximity info state */);
74        mInputSize += mProximityInfoStates[i].size();
75    }
76}
77} // namespace latinime
78