CWE-ou-minkata/Sources/Plasma/PubUtilLib/plMath/hsSearchVersion.h

/*==LICENSE==*

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*==LICENSE==*/

#ifndef hsSearchVersion_inc
#define hsSearchVersion_inc

#include "HeadSpin.h"

/*
do a template of lists to search for a matching entry. basic idea is that
you start off with an array of buckets and you know that you will get at
least one, possibly several, in each bucket. when you go to search, you already
know which bucket it will be in if it's there. even as the array is being filled,
each filled entry in each bucket has a valid forever index, as well as it's key
value. so array is fixed length, index into array has no bearing on forever index,
elements of array can grow, and at all times the used forever indices form a contiguous
set from 0 to max forever index.
*/

template <class T> class hsVersionNode {
protected:
    T                                       fData;
    int32_t                                   fIndex;
    hsVersionNode<T>*       fNext;
public:
    hsVersionNode(const uint32_t idx, const T &data) : fIndex(idx), fNext(nil) { fData = data; }
    ~hsVersionNode() { delete fNext; }

    hsVersionNode<T>*   Next() const { return fNext; }

    int32_t               Index() const { return fIndex; }

    inline void Append(hsVersionNode<T>* next);
    inline int operator==(const T& o) const;
    
    int operator!=(const T& o) const { return !(this->operator==(o)); }

    T&          GetData() { return fData; }
};

template <class T> int hsVersionNode<T>::operator==(const T& data) const
{
    return fData == data;
}

template <class T> void hsVersionNode<T>::Append(hsVersionNode<T>* next)
{
    if( fNext )
        fNext->Append(next);
    else
        fNext = next;
}

template <class T> class hsSearchVersion {
protected:
    uint32_t              fLength;
    hsVersionNode<T>**  fArray;
    uint32_t              fNextIndex;
    uint32_t              fNumIndex;
    uint32_t              fIncIndex;
    T**                 fBackArray;

    void                ICheckBackArray();
public:
    hsSearchVersion(uint32_t len, uint32_t inc = 0);
    ~hsSearchVersion();

    T&          operator[]( int32_t index );

    int32_t               Find(int where, const T& what, bool forceUnique=false);

    uint32_t              GetCount() const { return fNextIndex; }
};

template <class T> T& hsSearchVersion<T>::operator[]( int32_t index )
{
    hsDebugCode(hsThrowIfBadParam((uint32_t)index >= (uint32_t)fNextIndex);)

    return *fBackArray[index];
}

template <class T> hsSearchVersion<T>::hsSearchVersion(uint32_t len, uint32_t inc)
    : fNextIndex(0)
{ 
    fIncIndex = inc ? inc : len;
    fLength = len; 
    fArray = new hsVersionNode<T>*[fLength]; 
    HSMemory::Clear(fArray, fLength*sizeof(*fArray)); 
    fBackArray = new T*[fNumIndex = fLength];
}

template <class T> hsSearchVersion<T>::~hsSearchVersion()
{
    int i;
    for( i = 0; i < fLength; i++ )
        delete fArray[i];
    delete [] fArray;
    delete [] fBackArray;
}

template <class T> void hsSearchVersion<T>::ICheckBackArray()
{
    if( fNextIndex >= fNumIndex )
    {
        T** newBackArray = new T*[fNumIndex + fIncIndex];
        HSMemory::BlockMove(fBackArray, newBackArray, fNextIndex*sizeof(T*));
        delete [] fBackArray;
        fBackArray = newBackArray;
        fNumIndex += fIncIndex;
    }
}

template <class T> int32_t hsSearchVersion<T>::Find(int where, const T&what, bool forceUnique)
{
    hsVersionNode<T>* curr = fArray[where];

    ICheckBackArray();

    if( !curr )
    {
        hsVersionNode<T>* next = new hsVersionNode<T>(fNextIndex, what);
        fArray[where] = next;
        fBackArray[fNextIndex] = &next->GetData();
        return fNextIndex++;
    }
    if( *curr == what )
        return curr->Index();

    while( curr->Next() 
        && (forceUnique || (*curr->Next() != what)) )
        curr = curr->Next();

    if( curr->Next() )
        return curr->Next()->Index();

    hsVersionNode<T>* next = new hsVersionNode<T>(fNextIndex, what);
    curr->Append(next);
    fBackArray[fNextIndex] = &next->GetData();
    return fNextIndex++;
}

#endif // hsSearchVersion_inc