I am using Apache Pivot 2.0.2 and I am trying to build a DesktopApplication.
My problem is that I have a ListView or really - whatever object in my application, defined in bxml file. I can give it an ID or anything - no problem.
But now, how should I obtain this object in Java and affect changes I make to it?
Since my bxml are including other bxml files; after
this.window.open(display);
I have tried to obtain a certain object with:
bxmlSerializer.getNamespace().get("musicPanel");
And i can have the object with everything I put in BXML. I can even change its properties BUT
its not being reflected on the GUI! Nothing changes!
So I thought I could find my object in the
window.getContent();
but I cannot find a method to get an object with ID.
Any help appreciated!
Its hard to explain, but mainly I had to restructure my application and use my own namespace as in the example:
Stock Tracker Example
And it was useful to get the full sourcecode of these examples:
Sourcecode
Related
First of all this might be a dumb question and I searched for some days but didn't find an answer. So if there is an existing answer concerning my question, I would be grateful for a link.
I don't know if anyone of you ever coded Spigot, Paper or Bukkit, but there was a class called YamlConfiguration which had the following methods:
public FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);
cfg.set(path.path2, "hello");
cfg.getInt/String/...(path.path2); (which obviously returns "hello")
cfg.save(file);
The produced file then looks like this:
path:
path2: "hello"
So you could basically save any value in those files and reuse them even if your program has been restarted.
I know have moved forward from Spigot/Paper to native Java and I'm missing something like that Yaml-thing. The only thing I found was a kind of a config file, where every time the whole file is overwritten, when I try to add values.
Can you show me a proper way of saving values to a file? (would be nice without libraries)
I'm missing sth like that Yaml-thing
SnakeYAML should have you covered. Without knowing anything about your use-case, it makes no sense to discuss its usage here since its documentation already does cover the general topics.
The only thing I found was a kind of a config file, where everytime the whole file is overwritten, when I try to add values.
Saving as YAML will always overwrite the complete file as well. Serialization does not really work with append-only. (Serialization is the term to search for when you want functionality like this, by the way.)
If you mean that previous values were deleted, that probably was because you didn't load the file's content before or some other coding error, but since you don't show your code, we can only speculate.
Can you show me a proper way of saving values to a file?
People will have quite different opinions on what would be a proper way and therefore it is not a good question to ask here. It also heavily depends on your use-case.
would be nice without libraries
So you're basically saying „previously I used a library which had a nice feature but I want to have that feature without using a library“. This stance won't get you far in today's increasingly modular software world.
For example, JAXB which offers (de)serialization from/to XML was previously part of Java SE, but has been removed as of Java SE 11 and is a separate library now.
In my DSL I customize the index using a DefaultResourceDescriptionStrategy class and life is good. I can see my object descriptions as they are created, I can search the index for them and and in non-plugin tests the index contains only those objects exported by my DSL.
When using the UI, however, when I press 'ctr-shft-f3' (open model element) there is, in addition to the objects from my DSL, a ton of 'javafx' names (and only javafx, no other namespaces). When I search the index in UI mode I also find these objects (before my scope providers filter them out). Has anyone any idea what silly thing I may have done to cause this? It's not a huge problem since my filters remove junk anyway but
How did I manage to get that crap in there?
How to get rid of it?
Thanks in advance
There is only one Xtext index shared by all plugins, so languages can cross reference each other.
How did I manage to get that crap in there?
There should be a plugin which contributes it.
How to get rid of it?
You should find and uninstall this plugin.
I'm working on an Eclipse plugin that enables traceability. I am implementing a notification system that tells the user whenever a traced item changes (is removed, renamed or edited) and for that purpose I implemented an IResourceChangeListener, but that doesn't give me all the support that I want for Java elements.
For example, when I rename a Java method inside a .java file, it only tells me which file has been edited, but I would like to have the info about the method as well. I know that this can be achieved with implementing the IElementChangedListener, but is there any way around it? Do I really have to implement two listeners (ResourceListener for other files and ElementChangedListener just for java elements) or can I somehow get the IJavaElementDelta (normally obtained from the ElementChangedListener) from the IResourceDelta? Thanks!
These two deltas are completely unrelated. You need to use both listeners.
Try to check this link example 5. There is some method with this description:
Converts an IResourceDelta and its children into
the corresponding IJavaElementDeltas.
Return whether the delta corresponds to a resource on the classpath.
If it is not a resource on the classpath, it will be added as a non-java
resource by the sender of this method.
So I suppose it could be possible.
The links leads here which should you check ass well. Method public void processJavaDelta(IJavaElementDelta delta)
With reference to the following link, I have created the classes at run time, http://blog.javaforge.net/post/31913732423/howto-create-java-pojo-at-runtime-with-javassist. Now I need to view the created class that means Where will it create the class file? Is it possible to save it on disk/work space?
You can call cc.writeFile() right before or right after you call cc.toClass() to store a class file containing the bytecode of the generated class.
I don’t know of an equivalent operation to get a source file, however, you may consider the fact that you are actually generating the source code already (at least for the methods) and passing it to Javassist’s CtClass in order to be compiled.
So it’s not that hard to use the same code to generate the source code for an entire class as you only need to concatenate these methods, add field declarations and enframe it with a class body. After all, generating a source file means just writing a text file in a format that you already know very well…
The process of taking a java object and writing it to a text-like file is called serialization. The language has good built in support for this.
Oracle's documentation for these features can be found here and a tutorial here.
In general it's pretty easy to use and well understood and provides some clever features including the ability to detect if one version of a program saved the record but an incompatible version is trying to load it.
Also this stack overflow question will be useful to you.
Why would you want do do that? It's possible to create files from Pojos, then youll have to follow this tutorial:
http://www.mkyong.com/java/how-to-write-an-object-to-file-in-java/. But then you'll only write the contents of the fields to a file.
I have a multilingual web application that gets all of the translations from a single object, for example lang.getTranslation("Login") and the object is responsible for finding the translation in an xml file in the user's language.
What I'd like to do is a script / custom static analysis that outputs all the missing translations and translations that are no more used in the application. I believe I should start by programmatically finding every call to the getTranslation method and the string parameter, storing the data in a special structure and comparing it to all the translation files.
Is there a library that will allow me to do this easily? I already found Javassist but I can't use it to read the parameter values. I also tried grepping, but I'm not sure if that's a robust solution (in case there will be a call to another class that has a getTranslation method). I know Qt has a similar mechanism for finding translatable strings in the code, but that's a totally different technology..
I'm asking this because I'm quite sure there's a good existing solution for this and I don't want to reinvent the wheel.
Ok, here's how I did it. Not the optimal solution, but works for me. I created a utility program in Java to find all the method calls and compare the parameters to existing translations.
Find all classes in my project's root package using the Reflections library
Find all getTranslation method calls of the correct class in the classes using the Javassist library and create a list of them (contains: package, class, row number)
Read the appropriate .java files in the project directory from the given row until the ';' character
Extract the parameter value and add it to a list
Find the missing translations and output them
Find the redundant translations and output them
It took me a while to do this, but at least I now have a reusable utility to keep the translation files up to date.