Java constructor in interface11/8/2023 ![]() After all transforms have been run, it will be an error if multiple annotations (excluding those with SOURCE retention) exist.Īnnotations from the collector will be added and any existing annotations with the same name will be removed.Īnnotations from the collector will be added and any existing annotations with the same name will be removed but any new parameters found within existing annotations will be merged into the added annotation.Īnnotations from the collector will be ignored if any existing annotations with the same name are found.Īnnotations from the collector will be ignored if any existing annotations with the same name are found but any new parameters on the collector annotation will be added to existing annotations. The behavior of the mode parameter is determined by the AnnotationCollectorModeĮnum value chosen and is summarized in the following table.Īnnotations from the annotation collection will always be inserted. Having said that, by simply setting the mode, a number of commonlyĮxpected scenarios are handled automatically for you within any extra coding. Whatever checking logic you like within AST transforms - which are a frequent target forĪggregating. Write your own custom meta-annotation processors (covered next) and lets you write Preempt one correct way to handle the duplicate annotation issue, Groovy lets you Usually the parameters are used to set the initial states of the object. Quite appropriate for any of these answers to be correct. The constructors can also have parameters. Priority over the other? There is no correct answer. the inferred type from the constructor that accepts a Supplier lambda is an interface the interface of the inferred type has a method the interface method. Obtaining the components of a record as a typed tupleĪs an example, suppose you create a meta-annotation containing the annotationĪnd then place your meta-annotation on a class that already has an explicit Should this be an error? Should both annotations be applied? Does one take Obtaining the n th component from a record Obtaining the number of components in a record Obtaining a map of the record component values Obtaining a list of the record component values Differences with Sealed annotation (incubating) Handling duplicate annotations in meta-annotations Split property definition with an explicit backing field.Of course, PHPStan provides ignoreErrors configuration key in case this code issue is deliberate. (But a factory with general create method would still be better.)Įven if I accept that you want to have an interface constructor, I consider it valuable feedback for you that you forgot to use the parameter in Bas class. When calling new keyword, you always have a concrete class available (maybe in a variable, but still), because you can't do new FooInterface. Interface constructor does not make sense (and should be deprecated in PHP, for example Java does not allow it which tells you something) because you're interested in an interface only when it's typehinted as a method argument or return type, and at that point the object is already created and all you can do is to call methods on it. (PHPStan does not do that yet for other methods, because influencing their signatures may be out of the question because of interface/parent class requirements.) PHPStan aims to catch common errors in PHP applications - looking for unused constructor arguments and unused closure uses proved to be useful many times - when a variable is passed to constructor and not used, that means that it does not have to be passed there, or that the developer forgot to use it. I do not expect static analyzer to do architecture validation, that's a job for other tooling. There is no way a user could require other dependency, provide directly other constructor argument. ![]() The passing arguments through constructor just makes the code more readable. My usecase may be understood as a static invocation, just a configurable one. I may understand that this is your partial "shortcut" before proper implementation of Properties must be match their type after constructor call #305 will be implemented. Another welcome benefit of Java 8 Interfaces is the ability to add new concrete methods to an existing interface, which has already been implemented, without breaking the program. No compiler ever fails because of unsued parametr and if so, the language provides a way to silence it ( _) and do not force you to change a type signature. The most obvious benefit of using a Java 8 interface is its new concrete method capability. An unsused argument doesn't produce any notice, neither other error. I expect PhpStan will catch type errors, calls to undefined methods, etc. Many other arguments follow this premise, which is not always true. That's the main point why I used this solution. "When instantiating an object, you always know what specific class you are creating." I fully identify with this reasoning about proper architecture, though, few comments:
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