I am coding in Unity 2D and am making some scripts to build my mobile game (i am adding a score counter) and everytime i solve a problem another one occurs after. i was able to solve all those
previous problems until now. I have uploaded some screenshots to help:
This is whats happening in Unity:
This is whats happening in VSCode:
This is also happening in VSCode:
ScoreCounter cannot be private so change it to public or internal. This is explained in the documentation for Compiler Error CS1527:
Type declarations in a namespace can have either public or internal
access. If no accessibility is specified, internal is the default.
...when no namespace is explicitly declared in your program code, all
type declarations are located implicitly within the global namespace.
Also, declaring MonoBehaviour as an interface is likely to cause you problems. The UnityEngine namespace already defines MonoBehaviour as a class.
I am getting a bit confused on how CustomKeywords should be declared in Katalon Studio. Should they be declared like normal methods with access modifiers such as public, for example:
#Keyword
public void loadApp(int delay){
//some code
}
or should they be declared with the keyword def:
#Keyword
def loadApp(int delay){
//some code
}
One other thing I also observed in Katalon Studio is that even when I declared a method private in my CustomKeyword, I was able to call it from my test case which is the opposite of what I expected. I thought the private method would only be accessible in my CustomKeyword where I defined it.
In Katalon Studio, you need to use #Keyword annotation to tell the system this is a Custom keyword.
Public or Private will be counted if you use the function as Groovy programming language.
Finally having gotten GWT-Jackson-APT processors working and properly generating code for my classes, the one remaining hiccup I have is that for some reason gwt-jackson-apt uses the window JSON stringify (& parse) function.
$wnd.window.JSON.stringify(STRING)
The problem is that due to this being on a web-worker, $wnd.window is not defined. Even though JSON.stringify() is available in web-worker, the result is that the code won't run correctly, even though if I modify it to be just JSON.stringify() before uploading it works pefectly.
Is there a clean way to redefine which of these functions gets used in this instance?
What is the best means of going about fixing this so that my web-worker code doesn't try to call the functions that are not available in their context.
The library right now uses the elemental2 version of JSON Global.JSON.stringify
and if we look at the implementation of the JSON in the Global class we will find that it is assigned to the window instance here :
#JsType(isNative = true, name = "window", namespace = JsPackage.GLOBAL)
public class Global {
public static JSONType JSON;
}
when this is used as Global.JSON.stringify(someJsonObject) from GWT java code when compile it will produce $wnd.window.JSON.stringify(someJsonObject) or something very similar.
in order to fix this we need to access the native JSON in a different way that does not link it the current window instance.
one solution to this is to use JsInterop to interface directly with the JSON, something like this
#JsType(isNative = true, namespace = JsPackage.GLOBAL)
public class JSON {
public native static String stringify(Object jsonObj);
}
with this implementation we can use the JSON without the window prefix and when we use it in java like this JSON.stringify(someJsonObject) and notice how we no longer use the one from Global we end up with a generated Js that looks like this $wnd.JSON.stringify(someJsonObject)
i run a small test and implemented this JSON in the jackson-apt lib and switched to use the new implementation instead of using Global.JSON and all tests passed.
to me this looks like a good issue to be reported on the project repository. and i will apply the fix ASAP.
In a nutshell, if I define a constructor in a class thats named after the same name as the file itself, it returns the following area.
Some example code. Take the filename as ParseWebsiteData.scala for both.
This returns an error.
class ParseWebsiteData(url:String) {
}
This however, works fine.
class Foo(url:String) {
}
The only thing that I'm seeing as the issue are parser bugs from 2013, but this is the latest version of Eclipses's Scala IDE setup so I'm strongly thinking this is not the case, but turns out I'm wrong. Oops :(
As it's still an issue, what are the way(s) to avoid this occurring as I code in the future?
Well, can't tell the root cause but I was getting the same error in Scala Eclipse editor and I just did "project->clean" and it was gone!
GWT.create() is the reflection equivalent in GWT,
But it take only class literals, not fully qualified String for the Class name.
How do i dynamically create classes with Strings using GWT.create()?
Its not possible according to many GWT forum posts but how is it being done in frameworks like Rocket-GWT (http://code.google.com/p/rocket-gwt/wiki/Ioc) and Gwittir (http://code.google.com/p/gwittir/wiki/Introspection)
It is possible, albeit tricky. Here are the gory details:
If you only think as GWT as a straight Java to JS, it would not work. However, if you consider Generators - Special classes with your GWT compiler Compiles and Executes during compilation, it is possible. Thus, you can generate java source while even compiling.
I had this need today - Our system deals with Dynamic resources off a Service, ending into a String and a need for a class. Here is the solutuion I've came up with - btw, it works under hosted, IE and Firefox.
Create a GWT Module declaring:
A source path
A Generator (which should be kept OUTSIDE the package of the GWT Module source path)
An interface replacement (it will inject the Generated class instead of the interface)
Inside that package, create a Marker interface (i call that Constructable). The Generator will lookup for that Marker
Create a base abstract class to hold that factory. I do this in order to ease on the generated source code
Declare that module inheriting on your Application.gwt.xml
Some notes:
Key to understanding is around the concept of generators;
In order to ease, the Abstract base class came in handy.
Also, understand that there is name mandling into the generated .js source and even the generated Java source
Remember the Generator outputs java files
GWT.create needs some reference to the .class file. Your generator output might do that, as long as it is referenced somehow from your application (check Application.gwt.xml inherits your module, which also replaces an interface with the generator your Application.gwt.xml declares)
Wrap the GWT.create call inside a factory method/singleton, and also under GWT.isClient()
It is a very good idea to also wrap your code-class-loading-calls around a GWT.runAsync, as it might need to trigger a module load. This is VERY important.
I hope to post the source code soon. Cross your fingers. :)
Brian,
The problem is GWT.create doen't know how to pick up the right implementation for your abstract class
I had the similar problem with the new GWT MVP coding style
( see GWT MVP documentation )
When I called:
ClientFactory clientFactory = GWT.create(ClientFactory.class);
I was getting the same error:
Deferred binding result type 'com.test.mywebapp.client.ClientFactory' should not be abstract
All I had to do was to go add the following lines to my MyWebapp.gwt.xml file:
<!-- Use ClientFactoryImpl by default -->
<replace-with class="com.test.mywebapp.client.ClientFactoryImpl">
<when-type-is class="com.test.mywebapp.client.ClientFactory"/>
</replace-with>
Then it works like a charm
I ran into this today and figured out a solution. The questioner is essentially wanting to write a method such as:
public <T extends MyInterface> T create(Class<T> clz) {
return (T)GWT.create(clz);
}
Here MyInterface is simply a marker interface to define the range of classes I want to be able to dynamically generate. If you try to code the above, you will get an error. The trick is to define an "instantiator" such as:
public interface Instantiator {
public <T extends MyInterface> T create(Class<T> clz);
}
Now define a GWT deferred binding generator that returns an instance of the above. In the generator, query the TypeOracle to get all types of MyInterface and generate implementations for them just as you would for any other type:
e.g:
public class InstantiatorGenerator extends Generator {
public String generate(...) {
TypeOracle typeOracle = context.getTypeOracle();
JClassType myTYpe= typeOracle.findType(MyInterface.class.getName());
JClassType[] types = typeOracle.getTypes();
List<JClassType> myInterfaceTypes = Collections.createArrayList();
// Collect all my interface types.
for (JClassType type : types) {
if (type.isInterface() != null && type.isAssignableTo(myType)
&& type.equals(myType) == false) {
myInterfaceTypes.add(type);
}
for (JClassType nestedType : type.getNestedTypes()) {
if (nestedType.isInterface() != null && nestedType.isAssignableTo(myType)
&& nestedType.equals(myTYpe) == false) {
myInterfaceTypes.add(nestedType);
}
}
}
for (JClassType jClassType : myInterfaceTypes) {
MyInterfaceGenerator generator = new MyInterfaceGenerator();
generator.generate(logger, context, jClassType.getQualifiedSourceName());
}
}
// Other instantiator generation code for if () else if () .. constructs as
// explained below.
}
The MyIntefaceGenerator class is just like any other deferred binding generator. Except you call it directly within the above generator instead of via GWT.create. Once the generation of all known sub-types of MyInterface is done (when generating sub-types of MyInterface in the generator, make sure to make the classname have a unique pattern, such as MyInterface.class.getName() + "_MySpecialImpl"), simply create the Instantiator by again iterating through all known subtypes of MyInterface and creating a bunch of
if (clz.getName().equals(MySpecialDerivativeOfMyInterface)) { return (T) new MySpecialDerivativeOfMyInterface_MySpecialImpl();}
style of code. Lastly throw an exception so you can return a value in all cases.
Now where you'd call GWT.create(clz); instead do the following:
private static final Instantiator instantiator = GWT.create(Instantiator.class);
...
return instantiator.create(clz);
Also note that in your GWT module xml, you'll only define a generator for Instantiator, not for MyInterface generators:
<generate-with class="package.rebind.InstantiatorGenerator">
<when-type-assignable class="package.impl.Instantiator" />
</generate-with>
Bingo!
What exactly is the question - i am guessing you wish to pass parameters in addition to the class literal to a generator.
As you probably already know the class literal passed to GWT.create() is mostly a selector so that GWT can pick and execute a generator which in the end spits out a class. The easist way to pass a parameter to the generator is to use annotations in an interface and pass the interface.class to GWT.create(). Note of course the interface/class must extend the class literal passed into GWT.create().
class Selector{
}
#Annotation("string parameter...")
class WithParameter extends Selector{}
Selector instance = GWT.create( WithParameter.class )
Everything is possible..although may be difficult or even useless. As Jan has mentioned you should use a generator to do that. Basically you can create your interface the generator code which takes that interface and compile at creation time and gives you back the instance. An example could be:
//A marker interface
public interface Instantiable {
}
//What you will put in GWT.create
public interface ReflectionService {
public Instantiable newInstance(String className);
}
//gwt.xml, basically when GWT.create finds reflectionservice, use reflection generator
<generate-with class="...ReflectionGenerator" >
<when-type-assignable class="...ReflectionService" />
</generate-with>
//In not a client package
public class ReflectionGenerator extends Generator{
...
}
//A class you may instantiate
public class foo implements Instantiable{
}
//And in this way
ReflectionService service = GWT.create(ReflectionService.class);
service.newInstance("foo");
All you need to know is how to do the generator. I may tell you that at the end what you do in the generator is to create Java code in this fashion:
if ("clase1".equals(className)) return new clase1();
else if ("clase2".equals(className)) return new clase2();
...
At the final I thought, common I can do that by hand in a kind of InstanceFactory...
Best Regards
I was able to do what I think you're trying to do which is load a class and bind it to an event dynamically; I used a Generator to dynamically link the class to the event. I don't recommend it but here's an example if it helps:
http://francisshanahan.com/index.php/2010/a-simple-gwt-generator-example/
Not having looked through the code of rocket/gwittir (which you ought to do if you want to find out how they did it, it is opensource after all), i can only guess that they employ deferred binding in such a way that during compile time, they work out all calls to reflection, and statically generate all the code required to implement those call. So during run-time, you cant do different ones.
What you're trying to do is not possible in GWT.
While GWT does a good job of emulating Java at compile time the runtime is of course completely different. Most reflection is unsupported and it is not possible to generate or dynamically load classes at runtime.
I had a brief look into code for Gwittir and I think they are doing their "reflection stuff" at compile time. Here: http://code.google.com/p/gwittir/source/browse/trunk/gwittir-core/src/main/java/com/totsp/gwittir/rebind/beans/IntrospectorGenerator.java
You might be able to avoid the whole issue by doing it on the server side. Say with a service
witch takes String and returns some sort of a serializable super type.
On the server side you can do
return (MySerializableType)Class.forName("className").newInstance();
Depending on your circumstances it might not be a big performance bottleneck.