/// <summary>
/// Adds an array of fields to the FixMessage.
/// </summary>
/// <param name="fields">An array of fields.</param>
private void AddFieldArray(string[] fields)
{
// This local is used for repeating groups (see below.)
StringCollection groupFields = new StringCollection();
// Add each field after parse the values into a "Tag=Value" pair.
foreach (string field in fields)
{
// The 'Split' method has a bothersome habit of leaving a null entry when a token delimiter ends up a the end
// of the string. This will quickly filter out those byproducts of the 'Split'.
if (field == string.Empty)
{
continue;
}
// Break the field up into the 'Tag' and 'Value' fields, parse them and add them to the hash table.
string[] values = field.Split('=');
if (values.Length > 1)
{
try
{
//tagNumber
Tag tag = TagConverter.ConvertFrom(values[0]);
string stringValue = values[1];
// Handle repeating group fields here.
// Per the FIX spec:
// "Fields within repeating data groups must be specified in the order that the fields are
// specified in the message definition within the FIX specification document. The NoXXX field,
// where XXX is the field being counted, specifies the number of repeating group instances and
// must immediately precede the repeating group contents."
// Generally:
// 1. record the number of repeating group instances for a group when the NoXXX field occurs.
// 2. when each field in the group is read, save it in the groupFields array, unless it the last field.
// 3. when the last field of the group occurs, add a group entry to the group object.
// Order is important (See note from FIX spec above.) groupFields index 0 is the first field of the group, 1 is the second, etc.
// The xxxxGroup object (derived from class RepeatingGroup) holds the all of the repeating groups relating to "xxxx".
// Each repeating group in xxxxGroup is called an Entry.
// The groupFields array is temp space to hold the group fields as they are read from the FIX string.
switch (tag)
{
// IOIQualifiers.
// There is only one field (IOIQualifier) in each group, so groupFields is not used.
case Tag.NoIOIQualifiers:
// This field indicates the start of a set of repeating groups.
// But for FIX 4.0, only one IOIQualifier is allowed and this field is not used.
// So don't create the group object here, create it when the first qualifier is encountered.
// See IOIQualifier below.
break;
case Tag.IOIQualifier:
if (!this.ContainsKey(Tag.IoiQualifierGroup))
{
// if there is not yet an IoiQualifierGroup, create the group object to hold the repeating groups.
this[Tag.IoiQualifierGroup] = new IoiQualifierGroup();
}
// get the group object created previously.
IoiQualifierGroup ioiQualifierGroup = (IoiQualifierGroup)this[Tag.IoiQualifierGroup];
// IOIQualifier is the only field in this group, so add the group to the IoiQualifierGroup object.
// IOIQualifier is not a string in FixMessage, so it needs to be parsed into its correct type.
ioiQualifierGroup.Add((IOIQualifier)FixMessage.Parse(tag, stringValue));
break;
// RoutingIDs. (Valid in FIX 4.2 only.)
// There are 2 fields in each group here, so save the first one in the groupFields array.
// (It could just be saved in a string variable, but the array is more general. A group can have more than 2 fields.)
// For example:
// The following FIX string describes three repeating groups for Routing (215=3), with the first group having
// two fields: RoutingType=3 (216=3), and RoutingID=RTEID1 (217=RTEID1). Similarly for groups 2 and 3.
// 215=3|216=3|217=RTEID1|216=3|217=RTEID2|216=3|217=RTEID3|
case Tag.NoRoutingIDs:
// This field indicates the start of a set of repeating groups.
// Create the group object to hold the repeating groups.
this[Tag.RoutingGroup] = new RoutingGroup();
break;
case Tag.RoutingType:
// Save the RoutingType string in the groupFields collection.
groupFields.Add(stringValue);
break;
case Tag.RoutingID:
// RoutingID is the last field in this group, so add the group to the RoutingGroup object.
if (this.Contains(Tag.RoutingGroup))
{
// get the group object created above.
RoutingGroup routingGroup = (RoutingGroup)this[Tag.RoutingGroup];
if (groupFields.Count > 0)
{
// Add the current group fields to the group object.
// The first (and in this case only) item in the groupFields array is RoutingType.
// RoutingType combined with the RoutingID is a complete group.
// RoutingID is a string in FixMessage, so it doesn't need to be parsed.
// RoutingType is not a string in FixMessage, so it needs to be parsed into its correct type.
RoutingType routingType = (RoutingType)FixMessage.Parse(Tag.RoutingType, groupFields[0]);
routingGroup.Add(routingType, stringValue);
// once the group has been added, clear out the temp array for the next group.
groupFields.Clear();
}
}
break;
// Regular processing of (non-repeating) FIX fields.
default:
this[tag] = FixMessage.Parse(tag, stringValue);
break;
}
}
catch
{
string SenderComp = this.Contains(Tag.SenderCompID) ? this.SenderCompID : string.Empty;
string TargetComp = this.Contains(Tag.TargetCompID) ? this.TargetCompID : string.Empty;
Log.Error("MsgSeqNum={0}, SenderCompID={1}, TargetCompID={2}: Can't parse FIX field {3}={4}. Field ignored.", this.MsgSeqNum, SenderComp, TargetComp, values[0], values[1]);
}
}
}
}
/// <summary>
/// Converts the tag number string to a Tag, uses
/// the Parse method of the FixMessage class to convert
/// the text value to the proper type, and adds the field.
/// </summary>
/// <param name="tagNumber"></param>
/// <param name="stringValue"></param>
public void AddField(string tagNumber, string stringValue)
{
Tag tag = TagConverter.ConvertFrom(tagNumber);
this[tag] = FixMessage.Parse(tag, stringValue);
}