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deigote/groovy_closure_params_generics.groovy

Created May 30, 2014 10:24
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Trying to use type checked closures in Groovy, including their parameters
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groovy_closure_params_generics.groovy
private static File findOuputFile() {
this.<File>logAndReturn('info', { File outputFile -> "Using '$outputFile' as output file" }) {
new File("${System.getProperty('outputDir')}/memolo.html")
}
}
private static <O> O logAndReturn(
String logLevel,
@ClosureParams(ThirdParam.FirstGenericType.class) Closure<String> stringMessageGenerator,
Closure<O> resultProducer
) {
O result = resultProducer()
LoggerFactory.getLogger(this.class).invokeMethod(logLevel, stringMessageGenerator(result))
result
}
// Compiler says: Expected parameter of type java.lang.Object but got java.io.File
// .<File>logAndReturn('info', { File outpu
// ^
@melix
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melix commented May 30, 2014

Currently the compiler looses the information about explicit type hints (.) so unfortunatly, this cannot work. We're aware of this: https://jira.codehaus.org/browse/GROOVY-6757

Feel free to comment on that issue with your example.

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