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Craig Wittenberg
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Apr 6, 2018
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/******************************************************************** | ||
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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