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I'm trying to figure out how to: read xbrl files, analyze the files and make use of the data e.g. for calculating key figures, in Java.
I know how to read xbrl files as xml and structuring them with json nodes, but I have concluded that it's much more complicated to actually analyze them and use the data. I figured out that tags and attributes like "context id", "period" and "dimenson" etc determines how data is wired together.
Now, I'm not going to implement my own xbrl processor from scratch, because I simply don't have the time and knowledge to do that.
I'm looking for a Java library, including documentation and/or guides on how to use it, that processes xbrl files and that can be used to analyze and extract data.
I searched the web and read a few articles about how to get started, but I didn't quite find something that seemed very useful.
Any suggestions? I would really appreciate if someone could point me in the right direction.
Using an existing XBRL processor is a good idea as it saves you the (considerable) efforts of interpreting the XBRL semantics at a raw syntactic level.
From the top of my mind, I know of at least the following products that offer a Java API, in a random order. I have no affiliation with either and abstain from commenting further to not land into a taste/preference discussion.
Reporting Standard: http://www.reportingstandard.com/index.php/en/
CoreFiling: https://www.corefiling.com/
There are probably many more, possibly also open source. XBRL.org has a much more comprehensive list of vendors here as well as a getting started guide for developers.
I was able to parse Xbrl files from XbrlParser project here.
Credits: https://github.com/marcioalexandre
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I want to know, if there are recommended libraries for decision trees.
For me best laguages atm are Java (easiest) and PHP (long term-usefulness).
I need them for a thesis at university and want to use the code later on as a webservice. The problem itself is not important and could be solved in various ways. But as a condition/constraint I have to use decision trees.
And I searched for quiet a while, but nothing really smashing turned up. So I decided to ask you.
As I said, Java would be easiest for me. And so would be Java-like languages (C++,...). PHP would be most useful as I want to use pieces of that code later on a server. Also frontend programming would be much easier ;-)
Other hosting-supported languages would be ok, too, but I'm not yet familiar with them.
The functionality doesn't need to be very complex as the problem isn't that based on decision trees. It would be nice if I could load the structure (kind of nodes, costs, units) via i.e. XML and than load a configuration-set with dedicated numbers for each node/transistion.
But I'm wondering, if it's maybe easier to implement that stuff myself.
I would be very pleased, if you can recommend something. (And for future investigators other languages wouldn't bother ;-) )
You should look into the Weka API: https://weka.wikispaces.com/Use+WEKA+in+your+Java+code
They have an abundance of decision tree algorithms: ID3, CART, ...
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I've been searching high and low for an up to date solution to this age old problem.
Long story short I want to take css + html -> pdf and do it in java.
I don't want to use an API as the data is sensitive. Googling provides me with countless sites/services that offer to do this but I'm looking for a stand alone tool and looking for one that will work nicely from my java server. I've found this awesome looking command line tool but it's a command line tool and spawning processes off a web server starts to get sketchy IMO (but I'm always willing to hear otherwise). Additionally flying saucer seems to be a standard choice, but I've heard mixed reviews.
Here is a 5 year old question on the subject, but I figure things have changed! Especially with all the work being done in the area of front end unit testing with dom manipulation I figure there might be some less than conventional solutions and I'm willing to hear them all!
Any help would be greatly appreciated.
You might try a combination CSSBox that converts HTML+CSS to SVG and then use for example Batik for creating your PDF as proposed for example here. FlyingSaucer could also do the job.
The choice depends on your further requirements. E.g. are you processing "street HTML" or well-formed documents? What about the pages in the resulting PDF? What about interactive elements in the HTML pages?
I mean the only way is to try at least some options practically and then you may ask more specific questions about some particular problems.
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I'm a systems engineer, recent college grad, and I've just been given a project that is exceptionally daunting.
We have a legacy system, we legally own the entire code and all rights to it. The problem is that the code is poorly documented, what little documentation is incomplete, sometimes wrong and the original devs are unavailable.
It uses a custom Perl build script requires a thousand modules from CPAN to work and I do not know Perl. Reverse engineering into UML has failed except with Doxygen and that is limited to just inheritance diagrams and call graphs.
I've obtained a massive chalkboard and I'm slowly trawling through the code, modeling packages and then the nested packages within.
My question is whether or not I'm approaching this reverse engineering from the right direction. I'm working close from the bottom trying to figure out what calls what while developing UML and writing a Design Document. I did a package diagram but it's hard to figure out what's going on at that high a level.
An academic paper I pulled up suggests I also make a new Requirements Document which would slow me down even more and I don't know if it's a good idea as the other developers are always busy trying to keep the legacy system up.
Are there any books out there that can help me and am I approaching this from the right angle? Should I hire a contract worker that knows Perl and JMX to assist me?
The book "Working Effectively with Legacy Code" by Michael Feathers will probably help you more than anything we can tell you here.
However, the most important thing you need to clarify for yourself (and from your question it sounds like it's not completely clear) is this: what is your goal? What do you want to achieve with this codebase?
If the answer is (as it sounds) "being able to effectively maintain the existing project", then trying to directly build a complete high-level model of the system may not be the most effective path. It's probably just too much at once to keep in mind.
In this case, I would try to understand only the use cases of the system that you currently need to modify; follow method calls through the code (pssibly using a debugger on the running system) to see what parts are involved. Do this for a few different use cases and you'll start to see patterns, then document those and gradually fit them together into a high-level image of the system.
This tool might assist you.
Or if the legacy system is written poorly it could just make a huge unreadable mess, but I hope it helps.
If it is a java code then a deep reverse engineering would be very helpful.
See a documentation at: http://www.ejb3.org/jar_file_reverse/jar_file_reverse.html
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This question is a bit vague but I'd like to know if there's a Java tool that can run through my code and document it in a functional way. Is JavaDoc the only way to go, or are there alternatives?
JavaDoc is a good way of generating reference documentation. You can use custom doclets to adapt it to your needs (in look, functionality or extra bells-and-whistle) but it is still essentially still a list of methods and their descriptions.
Documenting enterprise software is more about documenting higher level stuff like design information, architecture, component interactions, etc. There's no software tool I know of that will do this for you automatically (reverse engineering tools will mostly produce a mess), but there are many content management systems that can help you organize and present it better.
You could also write a JavaDoc alternative (or use something existing) that uses reflection to analyze a class library and produce stuff, possibly with your help via annotations. For instance, there are research tools that let you place architectural constraints within your code, that are then used for conformance testing and possibly for documentation.
It all depends on what you want out of the generated documentation. JavaDoc is the standard way to do API documentation in Java, so that's probably your best starting point. There's actually a Doclet API if you just need to tweak the output. One example of the Doclet API in action is the UMLGraph doclet that can embed UML graphs in your JavaDoc output.
If you just hate JavaDoc, there's always things like Doxygen.
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I am looking for a library that can run on Java ME (Foundation Profile 1.1, CDC) and allows me to basically do something along the lines of
FILE OF type;
in Pascal.
Background: I need to have a largish (approx. 100MB) set of around 500.000 records for lookups by a known index value quickly. Do I really have to write this myself? Databases like Derby are way too big and bring lots of features (stored procedures, anyone?) I do not need.
Ideally I would just like to define a class with a few fields based on primitive types and Strings as a value holder object and persist these in a file I could - should the need arise - manually recover. That's why I am not too much into serialization. From the past I have fought several occasions of corrupted binary data files which could not be recovered at all.
Your biggest problem here is establishing a correspondence between field names and columns in the file, as you really shouldn't assume that the class layout matches the field ordering in the source file.
If the file were to contain a header row then it's a simple matter of using reflection/introspection and shouldn't take more than a day to implement yourself.
Alternatively, you'll have to use an annotation of some sort to specify, for each field, where it appears in the file.
Have you instead considered alternative text serialization methods, such as CSV, JSON or XML using XStream? These avoid the risks of binary corruption and would get you up and running faster, but might also impose a higher memory footprint which could be an issue as you're targeting a mobile device.
After looking around for quite some time, I have finally come to xBaseJ from SourceForge. It relies on java.nio, which is normally not included in the JavaME CDC profile, but we had a contractor port the relevant parts to the mobile J9 VM. Armed with this, we are now building our application on top of DBase III compatible files. Apart from being pretty reasonably fast, even on the mobile platform, this gives us access to a plethora of tools that can handle this format, without having to teach non-tech folks about a JDBC based DB admin tool they do not feel comfortable with.
There has just been a recent release of a whole eBook, called "The Minimum You Need To Know About xBaseJ", which is available for free from the project's website, too.