_ak_key_array_8h

Wwise SDK 2019.1.11

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 released in source code form as part of the SDK installer package.

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 Licensees holding valid commercial licenses to the AUDIOKINETIC Wwise Technology

 may use this file in accordance with the end user license agreement provided

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 Alternatively, this file may be used under the Apache License, Version 2.0 (the

 "Apache License"); you may not use this file except in compliance with the

 Apache License. You may obtain a copy of the Apache License at

 http://www.apache.org/licenses/LICENSE-2.0.

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 under the Apache License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES

 OR CONDITIONS OF ANY KIND, either express or implied. See the Apache License for

 the specific language governing permissions and limitations under the License.

 Version: <VERSION>  Build: <BUILDNUMBER>

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 #ifndef _KEYARRAY_H_

 #define _KEYARRAY_H_

 #include <AK/Tools/Common/AkArray.h>

 #include <AK/Tools/Common/AkKeyDef.h>

 // The Key list is simply a list that may be referenced using a key

 // NOTE : 

 template <class T_KEY, class T_ITEM, class U_POOL = ArrayPoolDefault, AkUInt32 TGrowBy = 1, class TMovePolicy = AkAssignmentMovePolicy<MapStruct<T_KEY, T_ITEM> > >

 class CAkKeyArray : public AkArray< MapStruct<T_KEY, T_ITEM>, const MapStruct<T_KEY, T_ITEM>&, U_POOL, TGrowBy, TMovePolicy>

 {

 public:

     //====================================================================================================

     // Return NULL if the Key does not exisis

     // Return T_ITEM* otherwise

     //====================================================================================================

     T_ITEM* Exists(T_KEY in_Key)

     {

         typename CAkKeyArray< T_KEY, T_ITEM, U_POOL, TGrowBy, TMovePolicy >::Iterator it = this->FindEx(in_Key);

         return (it != this->End()) ? &(it.pItem->item) : NULL;

     }

 public:

     //====================================================================================================

     // Sets the item referenced by the specified key and item

     // Return AK_Fail if the list max size was exceeded

     //====================================================================================================

     T_ITEM * Set(T_KEY in_Key, const T_ITEM & in_Item)

     {

         T_ITEM* pSearchedItem = Exists(in_Key);

         if (pSearchedItem)

         {

             *pSearchedItem = in_Item;

         }

         else

         {

             MapStruct<T_KEY, T_ITEM> * pStruct = this->AddLast();

             if (pStruct)

             {

                 pStruct->key = in_Key;

                 pStruct->item = in_Item;

                 pSearchedItem = &(pStruct->item);

             }

         }

         return pSearchedItem;

     }

     T_ITEM * SetFirst(T_KEY in_Key, const T_ITEM & in_Item)

     {

         T_ITEM* pSearchedItem = Exists(in_Key);

         if (pSearchedItem)

         {

             *pSearchedItem = in_Item;

         }

         else

         {

             MapStruct<T_KEY, T_ITEM> * pStruct = this->Insert(0); //insert at index 0 is AddFirst.

             if (pStruct)

             {

                 pStruct->key = in_Key;

                 pStruct->item = in_Item;

                 pSearchedItem = &(pStruct->item);

             }

         }

         return pSearchedItem;

     }

     T_ITEM * Set(T_KEY in_Key)

     {

         T_ITEM* pSearchedItem = Exists(in_Key);

         if (!pSearchedItem)

         {

             MapStruct<T_KEY, T_ITEM> * pStruct = this->AddLast();

             if (pStruct)

             {

                 pStruct->key = in_Key;

                 pSearchedItem = &(pStruct->item);

             }

         }

         return pSearchedItem;

     }

     // NOTE: The real definition should be 

     // typename CAkKeyArray<T_KEY,T_ITEM,TGrowBy, TMovePolicy>::Iterator FindEx( T_KEY in_Item ) const

     // Typenaming the base class is a workaround for bug MTWX33123 in the new Freescale CodeWarrior.

     typename AkArray< MapStruct<T_KEY, T_ITEM>, const MapStruct<T_KEY, T_ITEM>&, U_POOL, TGrowBy, TMovePolicy>::Iterator FindEx(T_KEY in_Item) const

     {

         typename CAkKeyArray< T_KEY, T_ITEM, U_POOL, TGrowBy, TMovePolicy >::Iterator it = this->Begin();

         typename CAkKeyArray< T_KEY, T_ITEM, U_POOL, TGrowBy, TMovePolicy >::Iterator itEnd = this->End();

         for (; it != itEnd; ++it)

         {

             if ((*it).key == in_Item)

                 break;

         }

         return it;

     }

     //====================================================================================================

     //  Remove the item referenced by the specified key

     //====================================================================================================

     void Unset(T_KEY in_Key)

     {

         typename CAkKeyArray< T_KEY, T_ITEM, U_POOL, TGrowBy, TMovePolicy >::Iterator it = FindEx(in_Key);

         if (it != this->End())

         {

             this->Erase(it);

         }

     }

     //====================================================================================================

     //  More efficient version of Unset when order is unimportant

     //====================================================================================================

     void UnsetSwap(T_KEY in_Key)

     {

         typename CAkKeyArray< T_KEY, T_ITEM, U_POOL, TGrowBy, TMovePolicy >::Iterator it = FindEx(in_Key);

         if (it != this->End())

         {

             this->EraseSwap(it);

         }

     }

 };

 /// Key policy for AkSortedKeyArray.

 template <class T_KEY, class T_ITEM> struct AkGetArrayKey

 {

     /// Default policy.

     static AkForceInline T_KEY & Get(T_ITEM & in_item)

     {

         return in_item.key;

     }

 };

 //Default comparison policy for AkSortedKeyArray.

 template <class T_KEY> struct AkDefaultSortedKeyCompare

 {

 public:

     template<class THIS_CLASS>

     static AkForceInline bool Lesser(THIS_CLASS*, T_KEY &a, T_KEY &b)

     {

         return a < b;

     }

     template<class THIS_CLASS>

     static AkForceInline bool Equal(THIS_CLASS*, T_KEY &a, T_KEY &b)

     {

         return a == b;

     }

 };

 /// Array of items, sorted by key. Uses binary search for lookups. BEWARE WHEN

 /// MODIFYING THE ARRAY USING BASE CLASS METHODS.

 template <class T_KEY, class T_ITEM, class U_POOL, class U_KEY = AkGetArrayKey< T_KEY, T_ITEM >, unsigned long TGrowBy = 1, class TMovePolicy = AkAssignmentMovePolicy<T_ITEM>, class TComparePolicy = AkDefaultSortedKeyCompare<T_KEY> >

 class AkSortedKeyArray : public AkArray< T_ITEM, const T_ITEM &, U_POOL, TGrowBy, TMovePolicy >

 {

 public: 

     AkForceInline bool Lesser(T_KEY &a, T_KEY &b) const

     {

         return TComparePolicy::Lesser((void*)this, a, b);

     }

     AkForceInline bool Equal(T_KEY &a, T_KEY &b) const

     {

         return TComparePolicy::Equal((void*)this, a, b);

     }

     T_ITEM* Exists(T_KEY in_key) const  

     {

         bool bFound;

         T_ITEM* pItem = BinarySearch(in_key, bFound);

         return bFound ? pItem : NULL;

     }

     // Add an item to the list (allowing duplicate keys)

     T_ITEM * Add(T_KEY in_key)

     {

         T_ITEM * pItem = AddNoSetKey(in_key);

         // Then set the key

         if (pItem)

             U_KEY::Get(*pItem) = in_key;

         return pItem;

     }

     // Add an item to the list (allowing duplicate keys)

     T_ITEM * AddNoSetKey(T_KEY in_key)

     {

         bool bFound;

         T_ITEM * pItem = BinarySearch(in_key, bFound);

         if (pItem)

         {

             unsigned int uIdx = (unsigned int)(pItem - this->m_pItems);

             pItem = this->Insert(uIdx);

         }

         else

         {

             pItem = this->AddLast();

         }

         return pItem;

     }

     // Set an item in the list (returning existing item if present)

     T_ITEM * Set(T_KEY in_key)

     {

         bool bFound;

         return Set(in_key, bFound);

     }

     T_ITEM * Set(T_KEY in_key, bool & out_bExists)

     {

         T_ITEM * pItem = BinarySearch(in_key, out_bExists);

         if (!out_bExists)

         {

             if (pItem)

             {

                 unsigned int uIdx = (unsigned int)(pItem - this->m_pItems);

                 pItem = this->Insert(uIdx);

             }

             else

             {

                 pItem = this->AddLast();

             }

             if (pItem)

                 U_KEY::Get(*pItem) = in_key;

         }

         return pItem;

     }

     bool Unset(T_KEY in_key)

     {

         T_ITEM * pItem = Exists(in_key);

         if (pItem)

         {

             typename AkArray< T_ITEM, const T_ITEM &, U_POOL, TGrowBy, TMovePolicy >::Iterator it;

             it.pItem = pItem;

             this->Erase(it);

             return true;

         }

         return false;

     }

     // WARNING: Do not use on types that need constructors or destructor called on Item objects at each creation.

     void Reorder(T_KEY in_OldKey, T_KEY in_NewKey, const T_ITEM & in_item)

     {

         bool bFound;

         T_ITEM * pItem = BinarySearch(in_OldKey, bFound);

         //AKASSERT( bFound );

         if (!bFound) return;// cannot be an assert for now.(WG-19496)

         unsigned int uIdx = (unsigned int)(pItem - this->m_pItems);

         unsigned int uLastIdx = this->Length() - 1;

         AKASSERT(*pItem == in_item);

         bool bNeedReordering = false;

         if (uIdx > 0) // if not first

         {

             T_ITEM * pPrevItem = this->m_pItems + (uIdx - 1);

             if (Lesser(in_NewKey, U_KEY::Get(*pPrevItem)))

             {

                 // Check one step further

                 if (uIdx > 1)

                 {

                     T_ITEM * pSecondPrevItem = this->m_pItems + (uIdx - 2);

                     if (Lesser(U_KEY::Get(*pSecondPrevItem), in_NewKey))

                     {

                         return Swap(pPrevItem, pItem);

                     }

                     else

                     {

                         bNeedReordering = true;

                     }

                 }

                 else

                 {

                     return Swap(pPrevItem, pItem);

                 }

             }

         }

         if (!bNeedReordering && uIdx < uLastIdx)

         {

             T_ITEM * pNextItem = this->m_pItems + (uIdx + 1);

             if (Lesser(U_KEY::Get(*pNextItem), in_NewKey))

             {

                 // Check one step further

                 if (uIdx < (uLastIdx - 1))

                 {

                     T_ITEM * pSecondNextItem = this->m_pItems + (uIdx + 2);

                     if (Lesser(in_NewKey, U_KEY::Get(*pSecondNextItem)))

                     {

                         return Swap(pNextItem, pItem);

                     }

                     else

                     {

                         bNeedReordering = true;

                     }

                 }

                 else

                 {

                     return Swap(pNextItem, pItem);

                 }

             }

         }

         if (bNeedReordering)

         {

             /////////////////////////////////////////////////////////

             // Faster implementation, moving only what is required.

             /////////////////////////////////////////////////////////

             unsigned int uIdxToInsert; // non initialized

             T_ITEM * pTargetItem = BinarySearch(in_NewKey, bFound);

             if (pTargetItem)

             {

                 uIdxToInsert = (unsigned int)(pTargetItem - this->m_pItems);

                 if (uIdxToInsert > uIdx)

                 {

                     --uIdxToInsert;// we are still in the list, don't count the item to be moved.

                 }

             }

             else

             {

                 uIdxToInsert = uLastIdx;

             }

             T_ITEM * pStartItem = this->m_pItems + uIdx;

             T_ITEM * pEndItem = this->m_pItems + uIdxToInsert;

             if (uIdxToInsert < uIdx)

             {

                 // Slide backward.

                 while (pStartItem != pEndItem)

                 {

                     --pStartItem;

                     pStartItem[1] = pStartItem[0];

                 }

             }

             else

             {

                 // Slide forward.

                 while (pStartItem != pEndItem)

                 {

                     pStartItem[0] = pStartItem[1];

                     ++pStartItem;

                 }

             }

             pEndItem[0] = in_item;

             ///////////////////////////////////////////////

         }

     }

     // WARNING: Do not use on types that need constructors or destructor called on Item objects at each creation.

     void ReSortArray() //To be used when the < > operator changed meaning.

     {

         AkInt32 NumItemsToReInsert = this->Length();

         if (NumItemsToReInsert != 0)

         {

             // Do a re-insertion sort.

             // Fool the table by faking it is empty, then re-insert one by one.

             T_ITEM * pReinsertionItem = this->m_pItems;

             this->m_uLength = 0; // Faking the Array Is Empty.

             for (AkInt32 idx = 0; idx < NumItemsToReInsert; ++idx)

             {

                 T_ITEM ItemtoReinsert = pReinsertionItem[idx]; // make a copy as the source is about to be overriden.

                 T_KEY keyToReinsert = U_KEY::Get(ItemtoReinsert);

                 T_ITEM* pInsertionEmplacement = AddNoSetKey(keyToReinsert);

                 AKASSERT(pInsertionEmplacement);

                 *pInsertionEmplacement = ItemtoReinsert;

             }

         }

     }   

     //If found, returns the item, if not, returns the insertion point.

     T_ITEM * BinarySearch( T_KEY in_key, bool & out_bFound ) const

     {

         AkUInt32 uNumToSearch = this->Length();

         AkInt32 iBase = 0;

         AkInt32 iPivot = 0;

         while ( uNumToSearch > 0 )

         {

             iPivot = iBase + ( uNumToSearch >> 1 );

             T_KEY pivotKey = U_KEY::Get( this->m_pItems[ iPivot ] );

             if ( Equal( pivotKey, in_key ) )

             {

                 out_bFound = true;

                 return this->m_pItems + iPivot;

             }

             if ( Lesser( pivotKey, in_key ) )

             {

                 iBase = iPivot + 1;

                 uNumToSearch--;

             }

             uNumToSearch >>= 1;

         }

         out_bFound = false;

         return this->m_pItems + iBase;

     }

     AkForceInline void Swap(T_ITEM * in_ItemA, T_ITEM * in_ItemB)

     {

         T_ITEM ItemTemp = *in_ItemA;

         *in_ItemA = *in_ItemB;

         *in_ItemB = ItemTemp;

     }

 };

 #endif //_KEYARRAY_H_