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

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*==LICENSE==*/

#ifndef hsSearchVersion_inc
#define hsSearchVersion_inc

#include "hsTypes.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                                   fIndex;
    hsVersionNode<T>*       fNext;
public:
    hsVersionNode(const UInt32 idx, const T &data) : fIndex(idx), fNext(nil) { fData = data; }
    ~hsVersionNode() { delete fNext; }

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

    Int32               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              fLength;
    hsVersionNode<T>**  fArray;
    UInt32              fNextIndex;
    UInt32              fNumIndex;
    UInt32              fIncIndex;
    T**                 fBackArray;

    void                ICheckBackArray();
public:
    hsSearchVersion(UInt32 len, UInt32 inc = 0);
    ~hsSearchVersion();

    T&          operator[]( Int32 index );

    Int32               Find(int where, const T& what, hsBool forceUnique=false);

    UInt32              GetCount() const { return fNextIndex; }
};

template <class T> T& hsSearchVersion<T>::operator[]( Int32 index )
{
    hsDebugCode(hsThrowIfBadParam((UInt32)index >= (UInt32)fNextIndex);)

    return *fBackArray[index];
}

template <class T> hsSearchVersion<T>::hsSearchVersion(UInt32 len, UInt32 inc)
    : fNextIndex(0)
{ 
    fIncIndex = inc ? inc : len;
    fLength = len; 
    fArray = TRACKED_NEW hsVersionNode<T>*[fLength]; 
    HSMemory::Clear(fArray, fLength*sizeof(*fArray)); 
    fBackArray = TRACKED_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 = TRACKED_NEW T*[fNumIndex + fIncIndex];
        HSMemory::BlockMove(fBackArray, newBackArray, fNextIndex*sizeof(T*));
        delete [] fBackArray;
        fBackArray = newBackArray;
        fNumIndex += fIncIndex;
    }
}

template <class T> Int32 hsSearchVersion<T>::Find(int where, const T&what, hsBool forceUnique)
{
    hsVersionNode<T>* curr = fArray[where];

    ICheckBackArray();

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

#endif // hsSearchVersion_inc