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Craig Wittenberg
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,121 @@ | ||
| /******************************************************************** | ||
| BagOValues.h | ||
| Copyright (c) Microsoft Corporation. All rights reserved. | ||
| Licensed under the MIT License. | ||
| ********************************************************************/ | ||
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| #include <map> | ||
| #include <vector> | ||
| #include <algorithm> | ||
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| #include "spinlock.h" | ||
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| using namespace std; | ||
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| template <class TValue> | ||
| class BagOValues | ||
| { | ||
| typedef pair<wstring, TValue> TPair; | ||
| typedef vector<TPair> TVector; | ||
| typedef typename TVector::const_iterator TItr; | ||
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| SpinLock m_spinlock; | ||
| TVector m_Values; | ||
| wstring m_lastStr; | ||
| TItr m_LastItr; | ||
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| public: | ||
| BagOValues() | ||
| { | ||
| } | ||
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| // copies the value, but doesn't assume any memory mangement needs be done | ||
| void Add(wstring key, TValue value) | ||
| { | ||
| this->m_spinlock.Lock(); | ||
| wstring lowered; | ||
| lowered.resize(key.size()); | ||
| transform(key.begin(), key.end(), lowered.begin(), ::tolower); | ||
| m_Values.insert(m_Values.end(), make_pair(lowered, value)); | ||
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| m_lastStr.resize(0); // clear this after new data added | ||
| this->m_spinlock.Unlock(); | ||
| } | ||
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| void Sort() | ||
| { | ||
| this->m_spinlock.Lock(); | ||
| sort(m_Values.begin(), m_Values.end()); | ||
| this->m_spinlock.Unlock(); | ||
| } | ||
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| // Retrieve with fPrefix = true means return values for the tree at the point of the query matched; | ||
| // we must consume the whole query for anything to be returned | ||
| // fPrefix = false means that we only return values when an entire key matches and we match substrings of the query | ||
| // | ||
| // NOTE: returns a newly allocated vector; must delete it | ||
| vector<TValue> *Retrieve(const wstring& query, bool fPrefix = true, unsigned maxResults = ULONG_MAX) | ||
| { | ||
| wstring lowered; | ||
| lowered.resize(query.size()); | ||
| transform(query.begin(), query.end(), lowered.begin(), ::tolower); | ||
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| vector<TValue> *results = NULL; | ||
| TValue val = TValue(); | ||
| TPair laspair = make_pair(lowered, val); | ||
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| this->m_spinlock.Lock(); | ||
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| // if last saved string/iterator is a prefix of the new string, start there | ||
| TVector::const_iterator itr; | ||
| if (m_lastStr.size() != 0 && lowered.compare(0, m_lastStr.size(), m_lastStr) == 0) | ||
| itr = m_LastItr; | ||
| else | ||
| { | ||
| itr = lower_bound(m_Values.begin(), m_Values.end(), laspair, CompareFirst); | ||
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| m_lastStr = lowered; | ||
| m_LastItr = itr; | ||
| } | ||
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| for (; itr != m_Values.end(); itr++) | ||
| { | ||
| const wstring& key = itr->first; | ||
| int cmp = key.compare(0, lowered.size(), lowered); | ||
| if (cmp == 0) | ||
| { | ||
| if (!fPrefix && key.size() != lowered.size()) | ||
| { | ||
| // need exact match (not just prefix); skip | ||
| continue; | ||
| } | ||
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| if (results == NULL) | ||
| results = new vector<TValue>(); | ||
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| if (results->size() >= maxResults) | ||
| break; | ||
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| results->insert(results->end(), itr->second); | ||
| } | ||
| else if (cmp > 0) | ||
| { | ||
| // iterated past the strings which match on the prefix | ||
| break; | ||
| } | ||
| } | ||
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| this->m_spinlock.Unlock(); | ||
| return results; | ||
| } | ||
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| private: | ||
| static bool CompareFirst(const TPair& a, const TPair& b) | ||
| { | ||
| return a.first < b.first; | ||
| } | ||
| }; | ||
|
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