Java Community | Help. Code. Learn.•3w ago

Creating Anonymous Class with Set Name

When creating an expression for the scripting language Skript (https://github.com/SkriptLang/Skript) you would do:

public class ExprWhatever extends SimpleExpression<String> {

    static {
        Skript.registerExpression(ExprWhatever.class, String.class, ExpressionType.COMBINED, "pattern");
    }

    @Override
    public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
        return true;
    }

    @Override
    protected String[] get(Event e) {
        return null;
    }

    .........
}

public class ExprWhatever extends SimpleExpression<String> {

    static {
        Skript.registerExpression(ExprWhatever.class, String.class, ExpressionType.COMBINED, "pattern");
    }

    @Override
    public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
        return true;
    }

    @Override
    protected String[] get(Event e) {
        return null;
    }

    .........
}

I want to add a QoL class for simple expressions like

var expr = SimpleExpression.create(String.class, "length of %string%", String::length, ...);
Skript.registerExpression(expr);

var expr = SimpleExpression.create(String.class, "length of %string%", String::length, ...);
Skript.registerExpression(expr);

so that you don't need to spam classes for simple stuff like this. The problem is the class name, I could return an anonymous class with the methods overriden but it will appear as Syntaxes$1 $2 $3... which would make it very hard to debug. Is there a way I can change that without ASM or anything bytecode related?

7 Replies

JavaBot•3w ago

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dan1st•3w ago

Where do these class names appear that make it hard to debug? What about using the same class with a custom toString?

eren.OP•3w ago

stack trace

dan1st•3w ago

If you are using JDK 22 or later, you can use the class file API instead of ASM: https://openjdk.org/jeps/466 While this is bytecode-related, I think you could create one template class and "just" replace the class name Note that this is a preview feature in JDK 22 and 23 but it will be final in JDK 24 (will be released in March)

eren.OP•3w ago

damn java releases so often this probably wont be used in main project but i can make a separate library i guess thank you

JavaBot•3w ago

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Creating Anonymous Class with Set Name

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