[Quickfix-developers] Creating arbitrary typed fields in Java

[Graham M. <gm...@de...>]

Hello all,=20

I'm trying to create an arbitrary field in an arbitrary QuickFIX message =
for the purposes of passing some fields straight through my app from my =
end user to my counterparty.  That is, I want to copy all of the extra =
fields in an incoming non-QuickFIX message into a new QuickFIX message, =
without needing to know ahead of time what type the fields are.

I'm working in Java-land, so bear with me (the Java API, not the Java =
port of QuickFIX).

Here's what I want to do--imagine it's in a loop copying all the =
fields... (does not compile):


quickfix.Message aMessage =3D getMessageFromSomewhereElse();
Field aField =3D new Field(
     someFieldIdentifier,  // for example 201, PutOrCall, but could be =
any valid field ID
     someObject            // in this example, an Integer, 0, Put
     );
aMessage.setField(aField);


But unfortunately there's no setField method overloaded to take just a =
Field.  There are overloaded versions that can take any of the =
subclasses of Field, but that doesn't help me very much, because I want =
to try to avoid having to determine the type.

It may be the case that I can't get around determining the type myself =
(but it seems that there should be a way).  In that case, I am guessing =
that I need to use an explicit DataDictionary, loaded up with the =
version of FIX I'm interested in. There doesn't seem to be a way to get =
a default data dictionary from the MessageFactory, for example.  Even =
then, after calling getFieldType(int fieldID), I am left with an integer =
specifier of the type, which there doesn't seem to be a good way to map =
to the subclasses of Field.

Thanks in advance for any help you can provide.

graham



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