/// <summary>
/// Inizializza un nuovo algoritmo per il parsing di uno specifico barcode
/// </summary>
/// <param name="barcode"></param>
public GS1Algorithm(char[] barcode)
{
_ai = "";
_state = GS1State.E;
Index = 0;
_barcode = barcode;
}
/// <summary>
/// Fa avanzare l'algoritmo per il riconoscimento dell'AI
/// </summary>
/// <param name="next">Il carattere successivo</param>
/// <returns></returns>
/// <exception cref="Drkstr.GS1AlgorithmException" /> in caso di errore
private GS1Algorithm SetNextChar(char next)
{
if (State == GS1State.E)
{
_state = GS1State.L2;
_ai = _ai + next;
}
else if (State == GS1State.L2)
{
if (AI.Equals("0"))
{
if (next == '0' || next == '1' || next == '2')
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("1"))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '5', '7' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("2"))
{
if (CharEquals(next, new char[] { '0', '1', '2' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else if (CharEquals(next, new char[] { '4', '5' }))
{
_state = GS1State.L3;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("3"))
{
if (CharEquals(next, new char[] { '0', '7' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '9' }))
{
_state = GS1State.L3;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (StringEquals(AI, new string[] { "4", "7", "8" }))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }))
{
_state = GS1State.L2;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("9"))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (StringEquals(AI, new string[] { "40", "41", "42" }))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (StringEquals(AI, new string[] { "70", "80", "81", "82" }))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }))
{
_state = GS1State.L4;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
}
else if (State == GS1State.L3)
{
if (AI.Equals("24"))
{
if (CharEquals(next, new char[] { '0', '1', '2' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("25"))
{
if (CharEquals(next, new char[] { '0', '1' , '3', '4'}))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (AI.Equals("25"))
{
if (CharEquals(next, new char[] { '0', '1', '3', '5' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
else if (StringEquals(AI, new string[] { "31", "32", "33", "34", "35", "36", "39" }))
{
if (CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
}
else if (State == GS1State.L4)
{
if(CharEquals(next, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 's' }))
{
_state = GS1State.EXT;
_ai = _ai + next;
}
else
{
throw new GS1AlgorithmException(Index);
}
}
return this;
}
/// <summary>
/// Esegue il reset dell'avanzamento del corrente algoritmo ma non cambia il barcode
/// N.B.: per utilizzare l'algoritmo su un altro barcode è necessario istanziarne uno nuovo
/// </summary>
public void ResetAI()
{
_ai = "";
_state = GS1State.E;
}
