Design advice for custom painting

Hi,
Can someone give me some high-level design advice on designing a JPanel subclass for custom painting? My panel class is becoming very complex, with lots of drawing and scaling methods, so I'm wondering if I could abstract away some of these graphical elements by creating new classes to make the design more object-oriented. However, I'm finding that there are also disadvantages in representing some of my graphic components as classes. Specifically,
1. It will lead to a much higher level of class coupling. My panel will depend on all these new classes to work correctly. In fact the situation is even worse because my panel is an inner class and, to do some of the scaling, needs to use methods from an object stored in the parent class. I would therefore have to also pass this object reference as an argument to many of these new classes.
2. It will lead to a lot of awkward passing of data between classes. For example, I need to use g2.drawImage(img, x, y, w, h, this), so I will have to pass not only the graphics context but also the panel reference itself.
Is it common for panel subclasses that do custom painting to be complex?
thanks,
Eric

I wrote the map view for a commercial GIS system. Drawing and scaling on a JPanel is challenging, but it need not be complex.
1. To eliminate class coupling, you need to create a couple of interfaces: Renderable (what you want drawn) and Renderer (the thing doing the low-level drawing). Renderer will have before and after setup and reset methods (to do things like scaling and rotation), and methods that the renderables can use to draw graphics. The Renderable interface can be as simple as a single method: draw(Renderer).
Every type of graphic that you draw on the screen would be a different class that implements Renderable, and which knows how to draw itself using whatever lower-level drawing commands you put in the Renderer. If you construct each Renderable in terms of java.awt.Shape, then Renderable.draw() could call a method Renderer.draw(java.awt.Shape, java.awt.Color).
2. The Panel becomes fairly simple. It has a Renderer and a collection of Renderable objects. Its paint() method calls the Renderer setup method, calls Renderable.draw(Renderer) on each object, and calls the Renderer reset method. Each Renderable in turn calls Renderable.draw(java.awt.Shape, java.awt.Color) one or more times.
Renderer should get a Graphics2D from the Panel when the setup method is called. That's when the Renderer does all of the scaling, positioning, and rotation on the Graphics2D. The Renderable implementations shouldn't even need to know about it.
I don't think custom painting code is necessarily complex, merely challenging to write. If you're only drawing a few lines and circles, you probably don't have to be too concerned about design elegance and code maintainability. The map view I designed for our GIS system, on the other hand, has to handle all kinds of map geometry, icons, text, and aerial photos.

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I was thinking the same thing, but don't have a
successful experience to validate my gut feelings.
Here's my only suggestion (which dubwai could
hopefully confirm or correct): write your entity
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When the
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Arch workflow design advice for a designer?

Sorry for the ambiguous title, I couldn't figure out what to call this post.
I'm new to Arch, though not Linux, and I must say, this is an amazing distro (I'm on the 64bit version). Dead simple, super fast, and nearly as flexible as a Gentoo system (that can use binaries!). Pacman is rockin'.
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No offense, but using WYSIWYG to design web pages doesn't sound very professional imo. They just don't offer the control that one would want with the code. I have tried a few (Frontpage, Dreamweaver, NVU, Bluefish, ...) and they all suck. They just don't do what you want it to. You drag something or add some formatting and it just messes up the code. It's better to just use a text editor and view the results in browser. Maybe that's slow or inefficient for you, but I find that's the best way to do it.
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Advice for custom transformation script to change table FK Associations

Hello,
I am attempting to write a transformation script that will cycle through tables in a large model and modify some
FK associations to change the remote table in the FK. As an aside, the reason for this is that our logical model
has logical entities that represent many small lookup code domains. However our relational/physical model has a
single utility code repository physical table which contains all these code domains. So part of the transformation
from our logical model to relational model is to swing all the FK associations for these lookup code domains
into the common code table. Then the tables representing the lookup domains can be hard deleted.
In any case, I'm looking at the
oracle.dbtools.crest.model.design.relational.FKIndexAssociation
or the
oracle.dbtools.crest.model.design.relational.Index
to see if one of these can be manipulated to perform the transformation I want to accomplish.
When I perform the equivalent process manually via property sheets there are several ways of accomplishing this.
a) The neatest method seems to be to modify the existing FK in place by clicking on the FK in the relational diagram and then changing
the property called 'PK / UK Index'. Change that to the PK of the utility code repository table that is replacing the original
table (representing the lookup domain). A side effect of this results in the mapping of the FK
columns being nulled out. So they need to be remapped to the original columns (which are retained).
So in two steps the existing FK is detached from the original table, reattached to the new table and then
the FK columns are reused in place for the new FK mapping.
b) The brute force method is to delete the original FK and then create an entirely new FK to the new table. There are
multiple dialogs which allow you to retain the original FK columns and reuse them in the new FK.
I realize this is a somewhat complex transformation but I'd appreciate some algorithmic advice on which path to take
to try to accomplish this. In particular, is there a scripting equivalent to the first process above?
I don't even know if the FK that is represented on the relational diagram is represented by the FKIndexAssociation or Index
class in the scripting object model. In other words, as I loop through the tables in the relational model what would be my
starting point:
fks = table.getFKAssociationsList();
or
fkIndexes = table.getAllInds_FKeyInds();
or something else. The names of the properties in the user interface don't always match with the scripting properties so
it's a little tricky to figure this stuff out.
Once I get access to the object that is equivalent to the FK in the diagram/property sheet, what
is the best way to manipulate it via scripting. How can I change the parent/remote end of the FK to point to the new table.
Or if I have to delete the original FK and then recreate it - is there a way to save the original FK columns and reuse them
while creating the new FK?
One other question. What is the best way to delete tables from a relational model. I note that there is an undocumented (?) remove()
method that is available on Table. It is probably on a superclass so other things can be removed as well.
When I try to use this method in a loop the script throws up dialogs similar to the dialogs that appear while performing a delete
manually via the UI. Is there any way to intercept and respond to the dialogs programmatically?
So for instance if I get a dialog popup like
Do you want to delete generated FK columns 'FOO' in table 'BAR'?
is there a way to intercept that dialog in the script and then answer Yes or No to it via the script?
If it turns out to be too difficult to perform this type of transformation via scripting the fallback
is to perform the transformation on the generated DDL file. But it would be cleaner to be able
to perform the transformation in the DM Relational model if possible.
Any advice appreciated.
Rgds, BP

Philip,
This is good info. I was able to get a rough version of my transformation script to work.
However I'd like to clean it up a bit.
In your notes it is not clear how the FKIndexAssociation and associated Index are related.
Is there a getter on FKIndexAssociation that references the associated Index?
It looks like the method fk.changeKeyObject() takes an Index object as its first parameter.
What would be the cleanest way to extract the PK Index from the Code table that I want
to point to? I used something like:
cdTable = model.getTableSet().getByName("CD_REPOSITORY");
cdPkIndex = cdTable.getIndexByName("CD_REPOSITORY_PK");
I used the latter method because it's the only one that returns an object of type Index
which is required as input to FKIndexAssociation.changeKeyObject(). However this method
requires the name of the index. That's fine but I'd like to just grab the PK's supporting index
directly if possible (without knowing the name).
I'm curious if there is a getter on Table or FKIndexAssociation that can just grab the index of the PK of
a table directly?
I don't see such a getter on FKIndexAssocation. On the Table class there are many getters that might be
of some use but the only one I could get to work was getIndexByName() as shown above.
I tried to use getIndexes() and then use isPk() on the result of that in a loop but that didn't return any result.
It looks like getters getIndexes(), getPKs(), getUKeys() return collections of DesignObject which are just the
superclass of FKIndexAssociation which is not what I need (i.e. which IS the actual underlying Index object).
So I guess the general question is what is the best way to get access to the Index objects in two scenarios.
First for the PK and UKs (typically on the 'parent-referenced' table) and secondly for FKs (typically on the 'child-referencing' table).
If I were imagining how this would work I would imagine getters on the Table for the former and a getter
on the FKIndexAssociation for the latter. But that's not how it works.
Also, as an aside - this 'Index' is somewhat confusing since these seem to be 'potential indexes' and not true database indexes.
These 'indexes' seem to be more closely related to database constraints and not actual indexes. I know that Primary Keys are
implemented in Oracle via a unique index but I'd like to confirm that the class
oracle.dbtools.crest.model.design.relational.Index
is not the same thing as a DDL database Index.
Secondary question. I notice when I run the script which loops through all the tables and redirects the FKs - the
diagram does not refresh. I had to save the model and then reload it for the graphical representation
of the FKs to change and redirect to the new table.
Is there a way to force the refresh to occur right away?
I've noticed that other transformation scripts I've written HAVE resulted in the diagram being refreshed
right away (even while the script is running). In this case it does not.
Rgds, BP

Design advice for vertical list calculations

I'm extending a product management life cycle sharpoint 365 site,
With purchase orders, magazine store, production targets (date based) and sold dates.
So that in our production environment we can see how much is stored, how much can be sold, and what we need to buy in etc.
The thing i'm a bit troubled about that sharepoint lists are not Excel, but this has to be done with Sharepoint lists.
They prefer not to have edits directly in the aspX code, but editing workflows in Sharepoint designer is OK
In excel one could easily add a cell formula with the content of Sum the value in the row left of me and add it to the value of myself one row earlier (like B2 contained = A2+B1 ); and then copy that formula to the whole B column
The nice thing with Excel is that when you change some value in A, like A2 = 10 and and later A5=10 then B7 would be 20
Changing later a value like A3 =4 would recalculate quickly and re- totals the B column.
Sharepoint Lists, calculated fields work only horizontally, so to do some vertical actions one needs a workflow, and do some lookup based upon (calculated previous) ID field, ea ID -1. Or stepp through to All ID's till current. What borders me a bit, is that
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Extremly simplified i have a single list with the columns below (where stored act as my B column).
bought | stored | sold
0 | 5 | 0
2 | 5 | 0 (raw products need to be manufactured before stored so they're added 1 by 1 later).
0 | 6 | 0
0 | 7 | 0
0 | 4 | 3 (but when sold we can subtract directly from storage)
Ofcourse i need some horizontal calculations because i need to track as well if there has been bought enough for production. But i wonder what would be Wise to do, base thing on current ID and ID minus 1, or to walk through all items by work flow (recalculate
whole list), or like with changes; recalculate from current changed till the end (not sure how to detect end yet.. but well something like that).
I just wonder what would be wise here, and the best direction for this.
The table i showed is a extreme simplified, in fact also some other tables and workflows will be the feeders of the data.
Its just that the whole thing makes me a bit worry and wonder what would be best, and maybe i oversee something maybe there are other ways for vertical calculations over lists.

After lots of thinking, and seeing how slow office 365 SharePoint reacted upon my list workflows.
I've decided to use a "site variables list", in which I store variables as rows and their value in a columns.
And I refer to them by ID (or one could use another indexed unique value).
It's maybe not an exact calculation of the whole thing (build around several lists) but everything is a lot faster then stepping trough each item in a huge list. And it also allows for a bit more easy tweaking of these "vertical" calculations.
If for some reason those calculations would need adjustments (by change of management definitions), I have easy access to those variables to adjust them.
On a side note, when I use those variables, it turned out it worked a bit better to create in the workflow local variables, then do the calculation, and put it in the right table you want those numbers to appear in. As compared to directly referring to the
total. It takes just 5 sec or so to update. With this method size of the lists have no almost no impact on the speed of the workflow now.

Design advice for setting users default time

I have an application that in a number of different places requires that records when being updated or created are shown to default to the user's current date. Depending on the location of the user, this could be a different day than where the server is.
All of the relevant fields in the database tables are using a datatype of "TIMESTAMP WITH TIMEZONE". When a users account is initially created, the timezone that the user is in is saved. When the user logs on, an "alter session set time_zone" command runs on the database to change the time zone of the current session.
When a user updates or creates a record and one of the field(s) requires to display the current date of the user, I call a ViewObject which runs a query to "select current_timestamp from dual" to return the current date from the database and populate the field with this.
I've realised that I'm creating a considerable overhead as this view object may be queried dozens of times during a users session and was thinking of running it once when the user logs on and storing the "USER_DATE" as a session variable - then I can simply refer to this each time, instead of many round-trips off to the database. Obviously there is a risk if the user logs on just before midnight and stays on until after that the date will be incorrect but this is extremely unlikely as the application is only used during normal business hours up to 9pm as an exception
Am I heading down the right track here or doing something daft (and missing something far more simple that I should be doing !)
Cheers,
Brent

Hi Frank,
Thanks for that - after 8 years of working with Oracle Forms and afterwards the same again with ADF, I still find it hard sometimes when using ADF to understand the best approach to a particular problem - there is so many different ways of doing things/where to put the code/how to call it etc... ! Things seemed so much simplier back in the Forms days !
Chandra - thanks for the information but this doesn't suit my requirements - I originally went down that path thinking/expecting it to be the holy grail but ran into all sorts of problems as it means that the dates are always being converted into users timezone regardless of whether or not they are creating the transaction or viewing an earlier one. I need the correct "date" to be stored in the database when a user creates/updates a record (for example in California) and this needs to be preserved for other users in different timezones. For example, when a management user in London views that record, the date has got to remain the date that the user entered, and not what the date was in London at the time (eg user entered 14th Feb (23:00) - when London user views it, it must still say 14th Feb even though it was the 15th in London at the time). Global settings like you are using in the adf-config file made this difficult. This is why I went back to stripping all timezone settings back out of the ADF application and relied on database session timezones instead - and when displaying a default date to the user, use the timestamp from the database to ensure the users "date" is displayed.
Cheers,
Brent

Print Peyment advice for moe than 2 lines only

Dear all,
I would like to be able to print a Payment advice only if there are more than 2 items in the list. Should I set some restrictions in the Payment advice for customizing? What shoul dbe set exactly?
Thank you very much,
Desimira

Hi,
There is no standard solution to it.
But there is one BTE (Business Transaction Event) available in transaction "FIBF > Settings > Products > of a Customer"
There do the F4 on the BTE and you will find a BTE for the Automatic Payment Program - Document Selection.
You can play your logic with the function module to be assigned for this BTE.
Regards,
Gaurav

Asking for advice for Jabber deployment - multi CUCM cluster\AD domains

I would like some design advice for deploying Jabber and CUPS in our company. We have 2 locations, west coast (SiteA) and east coast (SiteB). Each site have their own CUCM 7.15 clusters, Unity clusters, AD domains (trusted, but not in the same forest).
At SiteA I have setup CUPS (8.6.3.10000-20) and jabber and have it working great.
I would like to setup CUPS\Jabber for SiteB, but they need to be able to IM\call\etc to SiteA (And vice-versa).
SiteA and SiteB both have CUCM LDAP sync turned on, and LDAP directory synced with both domains (although SiteA cannot authenticate to CUCM at SiteB, and vice-versa due to the fact you can only LDAP sync authentication with one domain, CUCM user database contain users from SiteA and SiteB).
We have SIP trucks setup to pass internal calls and line status(BLF) between the trunks, and can communicate via internal extensions just fine.
The problem I’m running into is my jabber-config files uses the EDI directory – which can only look at one domain, so I cannot search the other domain. I believe changing to UDS fixes this, but I understand it would require me to upgrade both CUCM clusters to 8.6.2 - unless I’m mistaken.
I’m aware the desktop sharing will not work until CUCM is upgraded to 8.6.1 or 8.6.2.
I’m wondering if anyone has any advice, or can confirm I’m on the right track. Thanks in advance!

The thing that's important to understand is how CUP and Jabber build the XMPP URI. The URI has a left- and right-hand side; the left is the username while the right is the XMPP domain. CUP uses the LDAP attribute specified in CUCM's LDAP System page, sAMAccountName by default, for the left-hand-side. The right-hand side is the FQDN of the CUP cluster. Jabber must use the same values as CUP when displaying search results. Take note that nowhere in this process does the entire XMPP URI originate from the directory source.
In your case you have two separate CUP clusters in two separate domains. This won't work because when a user searches for a contact in the directory using Jabber, the client will build the XMPP URI as [email protected]. Even if you got the other domain's user objects into the search results the right-hand-side of the URI would be wrong and the presence subscription would never succeed since the other cluster is in another domain. As such your first task must be to move the CUP clusters into the exact same fully-qualified DNS domain. Once this is done you can use Inter-Cluster Peering to build a larger XMPP network in which all users have the same presence domain. If you intend to do Inter-Domain Federation in the future this must be your public DNS domain, not your internal active directory domain. If you use a non-public DNS domain TLS handshake will never succeed for inter-domain federation requests.
Once you have Inter-Cluster Peering in place you can use Active Directory Lightweight Directory Services (the new name for ADAM) to front-end both forests. Both CUCM clusters would need to import the full list of users representing both domains and the sAMAccountNames must be unique across both domains.
Finally, you can instruct Jabber to use UDS and query it's local CUCM cluster which will be able to return a search result from both domains. Since the CUP clusters are peered in the same domain the XMPP URI can be built properly, the presence subscription can be routed to the correct cluster, and life will be good.
By this point hopefully it's clear that EDI won't cut it since it would be limited to only returning search results from the local forest.
Please remember to rate helpful responses and identify helpful or correct answers.

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