I never received a response from this, but my DSL changed slightly such that
the closure is called with the receiving object rather than the generic
parameter of the receiving object, and that template parameter is picked up
properly, and in that case I can have a getter methods that return type T that
the static compiler can pick up.
However, I noticed that there is no closure params hint that specifies this! So
I had to make my own, if this really doesn't exist in Groovy today, I can make
a PR someday with it (but on what branch?):
public class ThisParam extends SingleSignatureClosureHint {
@Override
public ClassNode[] getParameterTypes(MethodNode node, String[] options,
SourceUnit sourceUnit, CompilationUnit unit, ASTNode usage) {
return new ClassNode[] { node.getDeclaringClass() };
}
}
Jason
From: Winnebeck, Jason [mailto:[email protected]]
Sent: Tuesday, November 22, 2016 11:10 AM
To: [email protected]
Subject: [External Source] ClosureSignatureHint for class generic type?
Suppose I have:
class Blah<T> { void doit(Closure<R> c) }
Used so:
Blah<String> b = new Blah<>("abc")
b.doit {it.trim()}
Is there a ClosureSignatureHint that specifies this?
This method from DGM is what I'd want, except doit is an instance method and
not a static one, so I can't use "FirstParam"
public static <T> Collection<T> each(Collection<T> self,
@ClosureParams(FirstParam.FirstGenericType.class) Closure closure)
I even tried FromString, but type checker still thinks the closure takes object.
void doit(@ClosureParams(value=FromString.class, options=["T"]) Closure<?> c)
[Static type checking] - Cannot find matching method java.lang.Object#trim().
Please check if the declared type is right and if the method exists.
I even tried my own hint class:
public class GenericClassType extends SingleSignatureClosureHint {
public ClassNode[] getParameterTypes(MethodNode node, String[] options,
SourceUnit sourceUnit, CompilationUnit unit, ASTNode usage) {
return new ClassNode[] { pickGenericType(node.getDeclaringClass(), 0) };
}
}
In GenericClassType hint it finds "T -> java.lang.Object". It doesn't seem to
know about the Blah instance.
What's weird is even if I change doit to take a java.util.function.Consumer<T>,
it still doesn't work.
Jason
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