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RE: [HAPI-devel] deep copy functionality
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From: Abraham T. <ti...@ta...> - 2001-12-14 17:00:23
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So many choices.. good luck in your decision, i'm partial to this one
you suggest,
define, for example, Segment.copyInto(Segment
otherSegment) and then implement it in AbstractSegment.
, implementable in all relevant abstract classes.
But depending on the direction of the project, you might want to
consider this one :
One other alternative which i've employed in some of the xml-ish stuff
i've done is to have a utility-class that has a family of static methods
for manipulating commonly manipulated objects... like segments. This
would work if we could make a fundamental toolbox-class that people
wouldn't forget to import when using the rest of the package.
HL7API.Toolbox.copyInto(obj, obj, int x, String name);
Where x is one of :
Toolbox.SEGMENT
Toolbox.MESSAGE
Toolbox.<other element>
And name is the name of the element. If we're trying to copy the msh
segment we'd use Toolbox.SEGMENT, name="MSH".
An advantage here is that we wouldn't break people's code with revisions
of an abstract class, just because we found yet another thing we like to
do with message elements in general. It's a pretty common way of doing
things. The Graphics class is an example, the Math class another, even
String has a couple of methods like the ones we're considering :
static String copyValueOf(char[] data)
Returns a String that is equivalent to the specified character
array.
static String copyValueOf(char[] data, int offset, int count)
Returns a String that is equivalent to the specified character
array.
Abraham Tio
MD, Chief Technologist
Tacteon LTD.
http://www.tacteonltd.com
-----Original Message-----
From: hl7...@li...
[mailto:hl7...@li...] On Behalf Of Tripp,
Bryan
Sent: Friday, December 14, 2001 11:40 AM
To: 'Abraham Tio'; 'Glock'; hl7...@li...
Subject: RE: [HAPI-devel] deep copy functionality
Hi Abe,
Excellent advice, as always. We could use something similar to clone(),
except that it wouldn't create a new object (so it would be copy(Object)
:
void, instead of clone() : Object). On the other hand why not define
type-specific copy methods for Message, Segment, and Type? Would we
want to
copy anything else? You could define, for example,
Segment.copyInto(Segment
otherSegment) and then implement it in AbstractSegment. I guess it's a
trade-off between genericness and type checking (?).
The only annoying thing is that if somebody had a Segment that didn't
inherit from AbstractSegment, they could have to implement copyInto
again.
But this would be a small percentage of the total work, and they could
always cut and paste.
Bryan
-----Original Message-----
From: Abraham Tio [mailto:ti...@ta...]
Sent: Friday, December 14, 2001 10:09 AM
To: 'Abraham Tio'; 'Glock'; hl7...@li...
Subject: RE: [HAPI-devel] deep copy functionality
In further thought, how about an interface for all things copiable ?
Or add an abstract method to the base class common to all classes ?
Abraham Tio
MD, Chief Technologist
Tacteon LTD.
http://www.tacteonltd.com
-----Original Message-----
From: hl7...@li...
[mailto:hl7...@li...] On Behalf Of Abraham
Tio
Sent: Friday, December 14, 2001 10:00 AM
To: 'Glock'; hl7...@li...
Subject: RE: [HAPI-devel] deep copy functionality
I would do both, and use the implementation as a pattern for copying
just about everything else that needs to be copied. Today we're
thinking about deep copy for the purposes of echoing segments and
messages. Tomorrow, who knows why we'll be copying. Much like the
clone() method in many java class interfaces, the uses are varied and
many.
Does the pretense of the clone() method apply to hl7 message components
?
Abraham Tio
MD, Chief Technologist
Tacteon LTD.
http://www.tacteonltd.com
-----Original Message-----
From: hl7...@li...
[mailto:hl7...@li...] On Behalf Of Glock
Sent: Friday, December 14, 2001 8:02 AM
To: hl7...@li...
Subject: [HAPI-devel] deep copy functionality
All:
I'm working on the deep copy functionality (task 42332) and am seeking
feedback on where this should be implemented. I'm leaning toward making
it part of the Message interface since it must act on an entire segment
in addition to select fields. Another option is to simply view the
segment as comprised of "all fields" and make it part of Segment
interface.
Thanks,
John Glock--
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