202 lines
7.7 KiB
C++
202 lines
7.7 KiB
C++
/* Copyright (c) 2015, 2017, 2020 The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef __LOC_UNORDERDED_SETMAP_H__
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#define __LOC_UNORDERDED_SETMAP_H__
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#include <algorithm>
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#include <loc_pla.h>
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#ifdef NO_UNORDERED_SET_OR_MAP
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#include <set>
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#include <map>
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#else
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#include <unordered_set>
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#include <unordered_map>
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#endif
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using std::unordered_set;
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using std::unordered_map;
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namespace loc_util {
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// Trim from *fromSet* any elements that also exist in *rVals*.
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// The optional *goneVals*, if not null, will be populated with removed elements.
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template <typename T>
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inline static void trimSet(unordered_set<T>& fromSet, const unordered_set<T>& rVals,
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unordered_set<T>* goneVals) {
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for (auto val : rVals) {
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if (fromSet.erase(val) > 0 && nullptr != goneVals) {
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goneVals->insert(val);
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}
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}
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}
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// this method is destructive to the input unordered_sets.
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// the return set is the interset extracted out from the two input sets, *s1* and *s2*.
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// *s1* and *s2* will be left with the intersect removed from them.
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template <typename T>
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static unordered_set<T> removeAndReturnInterset(unordered_set<T>& s1, unordered_set<T>& s2) {
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unordered_set<T> common = {};
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for (auto b = s2.begin(); b != s2.end(); b++) {
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auto a = find(s1.begin(), s1.end(), *b);
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if (a != s1.end()) {
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// this is a common item of both l1 and l2, remove from both
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// but after we add to common
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common.insert(*a);
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s1.erase(a);
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s2.erase(b);
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}
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}
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return common;
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}
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template <typename KEY, typename VAL>
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class LocUnorderedSetMap {
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unordered_map<KEY, unordered_set<VAL>> mMap;
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// Trim the VALs pointed to by *iter*, with everything that also exist in *rVals*.
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// If the set becomes empty, remove the map entry. *goneVals*, if not null, records
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// the trimmed VALs.
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bool trimOrRemove(typename unordered_map<KEY, unordered_set<VAL>>::iterator iter,
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const unordered_set<VAL>& rVals, unordered_set<VAL>* goneVals) {
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trimSet<VAL>(iter->second, rVals, goneVals);
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bool removeEntry = (iter->second.empty());
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if (removeEntry) {
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mMap.erase(iter);
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}
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return removeEntry;
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}
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public:
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inline LocUnorderedSetMap() {}
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inline LocUnorderedSetMap(size_t size) : LocUnorderedSetMap() {
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mMap.get_allocator().allocate(size);
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}
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inline bool empty() { return mMap.empty(); }
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// This gets the raw pointer to the VALs pointed to by *key*
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// If the entry is not in the map, nullptr will be returned.
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inline unordered_set<VAL>* getValSetPtr(const KEY& key) {
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auto entry = mMap.find(key);
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return (entry != mMap.end()) ? &(entry->second) : nullptr;
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}
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// This gets a copy of VALs pointed to by *key*
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// If the entry is not in the map, an empty set will be returned.
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inline unordered_set<VAL> getValSet(const KEY& key) {
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auto entry = mMap.find(key);
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return (entry != mMap.end()) ? entry->second : unordered_set<VAL>{};
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}
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// This gets all the KEYs from the map
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inline unordered_set<KEY> getKeys() {
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unordered_set<KEY> keys = {};
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for (auto entry : mMap) {
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keys.insert(entry.first);
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}
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return keys;
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}
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inline bool remove(const KEY& key) {
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return mMap.erase(key) > 0;
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}
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// This looks into all the entries keyed by *keys*. Remove any VALs from the entries
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// that also exist in *rVals*. If the entry is left with an empty set, the entry will
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// be removed. The optional parameters *goneKeys* and *goneVals* will record the KEYs
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// (or entries) and the collapsed VALs removed from the map, respectively.
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inline void trimOrRemove(unordered_set<KEY>&& keys, const unordered_set<VAL>& rVals,
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unordered_set<KEY>* goneKeys, unordered_set<VAL>* goneVals) {
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trimOrRemove(keys, rVals, goneKeys, goneVals);
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}
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inline void trimOrRemove(unordered_set<KEY>& keys, const unordered_set<VAL>& rVals,
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unordered_set<KEY>* goneKeys, unordered_set<VAL>* goneVals) {
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for (auto key : keys) {
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auto iter = mMap.find(key);
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if (iter != mMap.end() && trimOrRemove(iter, rVals, goneVals) && nullptr != goneKeys) {
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goneKeys->insert(iter->first);
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}
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}
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}
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// This adds all VALs from *newVals* to the map entry keyed by *key*. Or if it
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// doesn't exist yet, add the set to the map.
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bool add(const KEY& key, const unordered_set<VAL>& newVals) {
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bool newEntryAdded = false;
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if (!newVals.empty()) {
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auto iter = mMap.find(key);
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if (iter != mMap.end()) {
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iter->second.insert(newVals.begin(), newVals.end());
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} else {
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mMap[key] = newVals;
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newEntryAdded = true;
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}
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}
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return newEntryAdded;
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}
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// This adds to each of entries in the map keyed by *keys* with the VALs in the
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// *enwVals*. If there new entries added (new key in *keys*), *newKeys*, if not
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// null, would be populated with those keys.
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inline void add(const unordered_set<KEY>& keys, const unordered_set<VAL>&& newVals,
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unordered_set<KEY>* newKeys) {
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add(keys, newVals, newKeys);
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}
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inline void add(const unordered_set<KEY>& keys, const unordered_set<VAL>& newVals,
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unordered_set<KEY>* newKeys) {
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for (auto key : keys) {
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if (add(key, newVals) && nullptr != newKeys) {
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newKeys->insert(key);
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}
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}
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}
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// This puts *newVals* into the map keyed by *key*, and returns the VALs that are
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// in effect removed from the keyed VAL set in the map entry.
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// This call would also remove those same VALs from *newVals*.
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inline unordered_set<VAL> update(const KEY& key, unordered_set<VAL>& newVals) {
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unordered_set<VAL> goneVals = {};
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if (newVals.empty()) {
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mMap.erase(key);
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} else {
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auto curVals = mMap[key];
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mMap[key] = newVals;
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goneVals = removeAndReturnInterset(curVals, newVals);
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}
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return goneVals;
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}
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};
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} // namespace loc_util
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#endif // #ifndef __LOC_UNORDERDED_SETMAP_H__
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