public Generator(int totalCount, int groupSize = -1)
{
this.generatorRange = new GeneratorRange
{
Min = 0,
Count = totalCount
};
this.totalCount = totalCount;
this.groupSize = groupSize;
this.size = totalCount.ToString().Length;
}
public GeneratorRange GroupStartsWith(string pattern)
{
var gRange = new GeneratorRange
{
Min = 0,
Count = this.totalCount
};
gRange = this.GetIdRange(pattern, gRange);
gRange.Min *= this.groupSize;
gRange.Count *= this.groupSize;
this.generatorRange.Intersect(gRange);
return(this.generatorRange);
}
private GeneratorRange GetIdRange(string pattern, GeneratorRange gRange)
{
var lowerPattern = pattern.Substring(1).PadRight(this.size, '0');
var upperPattern = pattern.Substring(1).PadRight(this.size, '9');
if (int.TryParse(lowerPattern, out var minVal))
{
gRange.Min = Math.Max(gRange.Min, minVal);
}
if (int.TryParse(upperPattern, out var maxVal))
{
gRange.Count = Math.Min(gRange.Count, maxVal - gRange.Min + 1);
}
return(gRange);
}
public GeneratorRange Intersect(GeneratorRange generatorRange)
{
if (this.Min > generatorRange.Max)
{
this.Count = 0;
}
else if (this.Max < generatorRange.Min)
{
this.Count = 0;
}
else
{
var max = Math.Min(this.Max, generatorRange.Max);
this.Min = Math.Max(this.Min, generatorRange.Min);
this.Count = max - this.Min + 1;
}
return(this);
}