[Quickfix-developers] more message.getGroup questions.

[Alvin W. <AW...@FF...>]

OK, now I am doing something like this:

                Group group = new Group(NoAllocs.FIELD, 
AllocAccount.FIELD);
                allocationInstruction.getGroup(1, group);
        group.setDouble(9047, 100);//add a custom tag 9047 to the group
        //Then send out allocationInstruction

However, tag 9047 will not show up in the Allocation Message I created. 
Why?


Also, I wrote my own removeGroup mehtod as below:

    public static void removeGroups(Message message, int noField, int 
delimField)
        throws Exception
    {
        for (int i = 1; i <= message.getInt(noField); i++)
        {
            Group group = new Group(noField, delimField);
            message.getGroup(i, group);
            for (Iterator it = group.iterator(); it.hasNext();)
            {
                Field field = (Field)it.next();
                group.removeField(field.getField());
            }
        }
 
        message.removeField(noField); 
    } 

But after running it, I found the group is still there. Can anyone explain 
for me what is going on here? It seems that the group in message.getGroup(i, group) method is a "cloned" copy of the original. So changing it will not change 
the original. So how to change the original? What about the returned value 
of message.getGroup method?

Thanks a lot!
Also Brian, thanks so much for your help.
Alvin






Brian Erst <azz...@ya...>
10/10/2005 02:47 PM
Please respond to azzipsderf-quickfix

 
        To:     Alvin Wang <AW...@FF...>, qui...@li..., 
qui...@li..., 
azz...@ya...
        cc:     Caleb Epstein <cal...@gm...>, Oren Miller 
<or...@qu...>
        bcc: 
        Subject:        Re: [Quickfix-developers] getGroup


Alvin -

I don't know the Java side very well (I've coded to the C++ and .NET
versions), but the getGroup function is pretty simple.

First, you need to know the name of the field that acts as the group's
enumerator/designator. These almost always start with "No" (as in
"number"). You should check for the existence of that field - if it
isn't there, there won't be any group members either.

One example of this is the Legs group in NewOrderMultileg. This group
begins with a "NoLegs" field (defined as an IntField) that contains the
number of legs. 

In C++ - 

  FIX::NoLegs noLegs;
  if (message.isSetField(noLegs))
  {
    message.getField(noLegs);
    for (int i=0; i<noLegs.getValue(); i++)
       ...

 
In C#, we'd use the built-in field getters -

  if (message.isSetNoLegs())
  {
    for (int i=0; i<message.getNoLegs().getValue(); i++)
      ...

Second, you need to create a group object of the type you wish to
extract. In the C++ and .NET versions, these are defined as sub-classes
of the parent message type with a class name that is the same as the
field name of the enumeration field mentioned above. 

In C++ -

  FIX::NewOrderMultileg::NoLegs leg;

In C# -

  QuickFix43.NewOrderMultileg.NoLegs leg = new
QuickFix43.NewOrderMultileg.NoLegs();


Third, you use the "getGroup" method of the Message object to retrieve
a single element of the repeating group list. These elements are
indexed starting at "1", not "0".

In C++ -

  message.getGroup(1, leg);

In C# -

  message.getGroup(1, leg);


Full example, C++:

  FIX::NoLegs noLegs;
  if (message.isSetField(noLegs))
  {
    FIX::NewOrderMultileg::NoLegs leg;
    FIX::LegSide                  legSide;
 
    message.getField(noLegs);
    for (int i=0; i<noLegs.getValue(); i++)
    {
      message.getGroup(i+1, leg);
      leg.get(legSide);
      if (legSide.getValue() == FIX::Side_BUY)
        ... 
    }
  }

Full example, C#:

  if (message.isSetNoLegs())
  {
    QuickFix43.NewOrderMultileg.NoLegs leg = new
QuickFix43.NewOrderMultileg.NoLegs();

    for (int i=0; i<message.getNoLegs().getValue(); i++)
    {
      message.getGroup(i+1, leg);
      if (leg.getLegSide().getValue() == QuickFix.Side.BUY)
        ... 
    }
  }


Hope this helps.

- Brian Erst
Thynk Software, Inc.
 

--- Alvin Wang <AW...@FF...> wrote:

> public native Group getGroup(int int0, Group group) throws
> FieldNotFound;
> 
> Hi, Can anyone tell me how to use the getGroup method in Message
> class? 
> What are the 2 parameters? what does it return? 
> 
> BTW, quickfix is wonderful. Hopefully its document is as good as it.
> 
> Thanks
> Alvin
> 
> 
> 
> 
> 
> 
>
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