/// <summary>
/// Updates the value of an tag.
/// </summary>
private bool UpdateTagValue(
UnderlyingSystemTag tag,
Opc.Ua.Test.DataGenerator generator)
{
// don't update writeable tags.
if (tag.IsWriteable)
{
return false;
}
// check if a range applies to the value.
int high = 0;
int low = 0;
switch (tag.TagType)
{
case UnderlyingSystemTagType.Analog:
{
if (tag.EuRange != null && tag.EuRange.Length >= 2)
{
high = (int)tag.EuRange[0];
low = (int)tag.EuRange[1];
}
break;
}
case UnderlyingSystemTagType.Digital:
{
high = 1;
low = 0;
break;
}
case UnderlyingSystemTagType.Enumerated:
{
if (tag.Labels != null && tag.Labels.Length > 0)
{
high = tag.Labels.Length-1;
low = 0;
}
break;
}
}
// select a value in the range.
int value = -1;
if (high > low)
{
value = (generator.GetRandomUInt16()%(high - low + 1)) + low;
}
// cast value to correct type or generate a random value.
switch (tag.DataType)
{
case UnderlyingSystemDataType.Integer1:
{
if (value == -1)
{
tag.Value = generator.GetRandomSByte();
}
else
{
tag.Value = (sbyte)value;
}
break;
}
case UnderlyingSystemDataType.Integer2:
{
if (value == -1)
{
tag.Value = generator.GetRandomInt16();
}
else
{
tag.Value = (short)value;
}
break;
}
case UnderlyingSystemDataType.Integer4:
{
if (value == -1)
{
tag.Value = generator.GetRandomInt32();
}
else
{
tag.Value = (int)value;
}
break;
}
case UnderlyingSystemDataType.Real4:
{
if (value == -1)
{
tag.Value = generator.GetRandomFloat();
}
else
{
tag.Value = (float)value;
}
break;
}
case UnderlyingSystemDataType.String:
{
tag.Value = generator.GetRandomString();
break;
}
}
tag.Timestamp = DateTime.UtcNow;
return true;
}