[Clas12_software] EVIO dictionaries

[Mac Mestayer]

Hello Elliott;

I liked your examples, but I have a question.
I'm not sure what "DC" and then "xpos" means; we have
18 drift chambers arranged in 3 'regions' for each of
six 'sectors'.  Don't we need at least one more layer
between 'bank' and 'leaf'?

 			- Mac

"mestayer at jlab.org", (757)-269-7252

On Mon, 16 Apr 2012, Elliott Wolin wrote:

> Hi,
>
> This morning I checked into evio-4.0 a new version that implements a
> dictionary facility that I believe meets all requirements that were
> discussed last week.  To my knowledge this completes the initial round
> of C++ upgrades to EVIO, and now the Java and C++ versions should be
> completely compatible.
>
> A number of other improvements have been discussed, including adding
> append mode and random-access I/O.  We need to discuss with the DAQ
> group which are feasible and set priorities.
>
> I parse three types of XML dictionary tags:  "dictEntry", "bank" and
> "leaf".  In all cases the only attributes I look at are "name", "tag"
> and "num."  All other tags and attributes are ignored, so the XML can be
> used to define whatever else you want, e.g. definitions of composite
> bank structures, content specifications (e.g: contentType="int"), etc.
>
> dictEntry is the simplest, it just makes a entry into the map of names
> vs tag/num pairs.  It can occur anywhere in the XML:
>
> <dictEntry name="fred"  tag="1" num="1"/>
>
> Here the name "fred" is a synonym for the tag/num pair (1,1).
>
> "bank" and "leaf" are for describing hierarchical bank structures, e.g:
>
> <bank name="CLAS12" tag="1" num="0">
> <bank name="DC" tag="20" num="0">
> <leaf name="xpos" tag="20" num="1"/>
> <leaf name="ypos" tag="20" num="2"/>
> <leaf name="zpos" tag="20" num="3"/>
> </bank>
> <bank name="SC" tag="30" num="0">
> <leaf name="xpos" tag="30" num="1"/>
> <leaf name="ypos" tag="30" num="2"/>
> <leaf name="zpos" tag="30" num="3"/>
> </bank>
> </bank>
>
> where "bank" means bank-of-banks, and "leaf" means bank-of-ints (or
> floats or another primitive types).  The parser will generate map
> entries that equate the tag/num pair (1,0) to "CLAS12", (20,0) to
> "CLAS12.DC", (20,1) to "CLAS12.DC.xpos", (30,3) to "CLAS12.SC.zpos", etc
> (actually I think everything is case-insensitive, have to check).
>
> We can discuss other tag names besides "bank" and "leaf," but I think
> these are adequate.  Currently if a leaf entry has children an exception
> is thrown.  I could change this to a warning if desired.
>
> Please give it a try.
>
> Thanks,
>
> -- 
>
> 				Sincerely,
> 					Elliott
>
>
> ================================================================================
>
>
>  Those raised in a morally relative or neutral environment will hold
> 		    no truths to be self-evident.
>
>
> Elliott Wolin
> Staff Physicist, Jefferson Lab
> 12000 Jefferson Ave
> Suite 8 MS 12A1
> Newport News, VA 23606
> 757-269-7365
>
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>
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