JDeveloper Filter Add-in
I hinted at a project to develop a simple filter add-in in my last post on Code Generation with JDeveloper. So that turned into my latest
weekend project;-)
I'm registering the project on sourceforge, but in the meantime you can get the full source kit here, or if you
prefer just the add-in jar here (which just needs
to be dropped into your ${jdev.home}/jdev/extensions folder). [30-Jan-2008: the project
is now available on sourceforge]
What does it do?
It is a simple idea. Allow you to invoke an external program to filter any text you have selected in the
JDeveloper Editor. Of course, it is up to you to define what filter means - limited by your imagination only.
And by externalizing the filter process, it means you can use the tool or scripting language of your choice to
implement and make on-the-fly changes to your filter.
To be precise, the filter operates like operating system pipes:
- Selected text is sent to the standard-input of the filter process.
- The standard-output of the filter process is written back to replace the selected text.
Configuring the Filter
Configuration is done via the JDeveloper Tools | Preferences menu, and is very simple at present. It only supports a single filter process definition. As you can see in the screenshot, you just need to enter a valid command line to invoke the filter. A nice enhancement would be the support for multiple filter definitions.
This is where the flexibility comes in. As an example, I've provided a rot13 encoder written in ruby [samples/myrot13filter.rb in the source kit].
puts $stdin.readlines.to_s.tr("A-Za-z", "N-ZA-Mn-za-m")
Ruby, Perl, php,
vbscript/WSH, bash ... use whatever you prefer. Rather than needing to develop and deploy an add-in in Java, you can
just script the filter.Applying the filter is simply a matter of selecting some text in the IDE, and choose the Custom Text Filter item from the right-click pop-up menu
The Development View
The truth is that I developed this add-in as more an investigation of the Extensions SDK, and the filter idea appeared to be unexplored territory.
As Brian Duff writes, there are some major improvements in the support for JDeveloper Extensions in 11g. Since it is still in preview, I decided to stick with Extension SDK 10.1.3 however.
There are four classes of significance. since this was an educational exercise, I spent a bit of time to make sure I really understood how it all worked, and tried to reflect that with liberal comments in the source.
- CodePaneAddin - implements the pop-up menu hook and applies the filter
- ExecShell - wraps the invocation of the filter process iwth stdin/out handling. It is independent of the extension API and may be of interest in its own right
- ConfigPanelData - handles preferences panel configuration
- ConfigData - bean to wrap the configuration data
The source kit comes with a JDeveloper project and also ant build file. If you want to build and deploy the add-in to JDeveloper, simplest is to first check the environment-specific settings in build.properties and then simply run
C:\MyDocs\MyDev2\JDevFilter>ant deploy
Buildfile: build.xml
init:
prepare:
compile:
jar:
deploy:
[copy] Copying 1 file to C:\oracle\jdevstudio10131\jdev\extensions
BUILD SUCCESSFUL
Total time: 0 seconds
Interested? Head on over to sourceforge to download the kit.
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Jupiter
Ben Bova's
https://amzn.to/
Jupiter
has me hooked on a new rack in the sci-fi bookshelf.
I've always liked the hard-science of Asimov, and find myself frequently revisiting classics like
The Naked Sun. It was not until
Jupiter
that I've found anything close.
Now I'm just slow of course - for a long time I've been vaguely aware of the name Ben Bova and the
respect he holds in scifi circles, but have failed to seek him out.
Jupiter is the tale of Grant Archer's conscription to serve as a graduate student on the
planetary research station orbiting Jupiter, and his secret mission forced on upon him to spy for the
fundamentalist religious groups that have political power in their grip back on earth. In all its intriguing
detail of the efforts to explore the planet Jupiter, the real story is the exploration of the relationship -
and often conflict - between scientific inquiry and religion.
I am sure the first of many Ben Bova novels I will read.
The rash assertion that "God made man in His own image" is ticking like a time bomb at the foundation of many faiths. - Arthur C. Clarke
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Gordon Ramsay - The Biography
Living in Singapore, I first came across Gordon Ramsay on afc. I had no idea who this loud mouth git was.
But Ramsay's Kitchen Nightmares soon got me hooked. Once you get past his confronting style,
you start to realise there is real passion, concern and intelligence behind the bluster. And he seems to do a
damn good job of turning places around on a dime.
On a whim, I picked up
Gordon Ramsay - The Biography
in the library. Got me suckered in very
quickly and I tore through it in a day. The story behind the man is well told, and gives an idea of where the
driven, hard-swearing and uncompromising character comes from. And why you should not be surprised that he is
at heart a loving family guy with a wicked sense of humour and love for life... and be not a little bit
impressed with all he has achieved along the way.
You may not agree that Ramsay's way is the best or only way to run a kitchen or a business, but he proves that
it certainly is a way - and one that has worked for him.
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