AAX_CBinaryDisplayDelegate.h

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#ifndef AAX_CBINARYDISPLAYDELEGATE_H
#define AAX_CBINARYDISPLAYDELEGATE_H

#include "AAX_IDisplayDelegate.h"
#include "AAX_CString.h"


#include <vector>
#ifdef WINDOWS_VERSION
#include <algorithm>
#endif

#include <algorithm>


template <typename T>
class AAX_CBinaryDisplayDelegate : public AAX_IDisplayDelegate<T>
{
public:
    AAX_CBinaryDisplayDelegate(const char* falseString, const char* trueString);
    AAX_CBinaryDisplayDelegate(const AAX_CBinaryDisplayDelegate& other);

    //Virtual Overrides
    AAX_IDisplayDelegate<T>*    Clone() const;
    bool                        ValueToString(T value, AAX_CString* valueString) const;
    bool                        ValueToString(T value, int32_t maxNumChars, AAX_CString* valueString) const ;
    bool                        StringToValue(const AAX_CString& valueString, T* value) const;

    void                        AddShortenedStrings(const char* falseString, const char* trueString, int iStrLength);

private:
    AAX_CBinaryDisplayDelegate();       //private contructor to prevent its use externally.

    const AAX_CString       mFalseString;
    const AAX_CString       mTrueString;
    uint32_t                 mMaxStrLength;
    
    struct StringTable
    {
        int                         mStrLength;
        AAX_CString         mFalseString;
        AAX_CString         mTrueString;
    };
    static bool StringTableSortFunc(struct StringTable i, struct StringTable j)
    {
        return (i.mStrLength < j.mStrLength);
    }
    
    std::vector<struct StringTable> mShortenedStrings;
};


template <typename T>
AAX_CBinaryDisplayDelegate<T>::AAX_CBinaryDisplayDelegate(const char* falseString, const char* trueString) :
    mFalseString(falseString),
    mTrueString(trueString),
    mMaxStrLength(0)
{
    mMaxStrLength = (std::max)(mMaxStrLength, mFalseString.Length());
    mMaxStrLength = (std::max)(mMaxStrLength, mTrueString.Length());
}

template <typename T>
AAX_CBinaryDisplayDelegate<T>::AAX_CBinaryDisplayDelegate(const AAX_CBinaryDisplayDelegate& other) :
    mFalseString(other.mFalseString),
    mTrueString(other.mTrueString),
    mMaxStrLength(other.mMaxStrLength)
{
    if ( other.mShortenedStrings.size() > 0 )
    {
        for ( size_t i = 0; i < other.mShortenedStrings.size(); i++ )
            mShortenedStrings.push_back( other.mShortenedStrings.at(i) );
    }
}

template <typename T>
void AAX_CBinaryDisplayDelegate<T>::AddShortenedStrings(const char* falseString, const char* trueString, int iStrLength)
{
    struct StringTable shortendTable;
    shortendTable.mStrLength = iStrLength;
    shortendTable.mFalseString = AAX_CString(falseString);
    shortendTable.mTrueString = AAX_CString(trueString);
    mShortenedStrings.push_back(shortendTable);
    
    // keep structure sorted by str lengths
    std::sort(mShortenedStrings.begin(), mShortenedStrings.end(), AAX_CBinaryDisplayDelegate::StringTableSortFunc );
}


template <typename T>
AAX_IDisplayDelegate<T>*        AAX_CBinaryDisplayDelegate<T>::Clone() const
{
    return new AAX_CBinaryDisplayDelegate(*this);
}

template <typename T>
bool    AAX_CBinaryDisplayDelegate<T>::ValueToString(T value, AAX_CString* valueString) const
{
    if (value)
        *valueString = mTrueString;
    else
        *valueString = mFalseString;
    return true;
}

template <typename T>
bool    AAX_CBinaryDisplayDelegate<T>::ValueToString(T value, int32_t maxNumChars, AAX_CString* valueString) const
{
    // if we don't ahve any shortened strings, just return the full length version
    if ( mShortenedStrings.size() == 0 )
        return this->ValueToString(value, valueString);
    
    // first see if requested length is longer than normal strings
    const uint32_t maxNumCharsUnsigned = (0 <= maxNumChars) ? static_cast<uint32_t>(maxNumChars) : 0;
    if ( maxNumCharsUnsigned >= mMaxStrLength )
    {
        if (value)
            *valueString = mTrueString;
        else
            *valueString = mFalseString;
        return true;
    }
    
    // iterate through shortened strings from longest to shortest
    // taking the first set that is short enough
    for ( int i = static_cast<int>(mShortenedStrings.size())-1; i >= 0; i-- )
    {
        struct StringTable shortStrings = mShortenedStrings.at(static_cast<unsigned int>(i));
        if ( shortStrings.mStrLength <= maxNumChars )
        {
            if (value)
                *valueString = shortStrings.mTrueString;
            else
                *valueString = shortStrings.mFalseString;
            return true;
        }
    }

    // if we can't find one short enough, just use the shortest version we can find
    struct StringTable shortestStrings = mShortenedStrings.at(0);
    if (value)
        *valueString = shortestStrings.mTrueString;
    else
        *valueString = shortestStrings.mFalseString;
    
    return true;
}

template <typename T>
bool    AAX_CBinaryDisplayDelegate<T>::StringToValue(const AAX_CString& valueString, T* value) const
{
    if (valueString == mTrueString)
    {
        *value = (T)(true);
        return true;
    }
    if (valueString == mFalseString)
    {
        *value = (T)(false);
        return true;
    }
    *value = (T)(false);
    return false;
}
    



#endif //AAX_CBINARYDISPLAYDELEGATE_H