#Jetbrains annotations how to#
#Jetbrains annotations full#
#Jetbrains annotations code#
#Jetbrains annotations series#

The PathReference annotation also provides navigation to the specified path! Paths can be relative or absolute, starting from the web root ( ~).

#Jetbrains annotations code#

When annotating a class member (such as a property) or a method parameter with PathReference, we will get code completion for files and folders within our project. All of a sudden, we get syntax highlighting, code analysis and code completion for the placeholders, including formatting!įile-system completion with PathReference When we use the annotation, Rider and ReSharper will know our method takes a composite format string, followed by arguments that will replace the placeholders in the format string. Using the StringFormatMethod annotation, we can indicate that a method works similar to the string.Format method.

Better string formatting with with StringFormatMethod We can use the ItemCanBeNull/ ItemNotNull annotations with implementations of IEnumerable, Task and Lazy classes to indicate that the value of a collection item, of the Task.Result property or of the Lazy.Value property can or can never be null. Rider and ReSharper will add when we use the ? type assist, and when using the ! type assist:

#Jetbrains annotations full#

Writing the full name of the attribute can be cumbersome. Rider and ReSharper will then warn us if we pass an invalid value: Similarly we can annotate method parameters with these attributes – either manually or when using the Check parameter for null quick fix (via Alt+Enter). By decorating it with the attribute, Rider and ReSharper will inform us the null check is always true (and hence, redundant): Our GetGuidString() method always returns a value, so the guidString != null is redundant. Static string GetGuidString() => Guid.NewGuid().ToString() Rider and ReSharper perform value analysis to help us in detecting possible null references, redundant comparisons and null checks.

#Jetbrains annotations series#

We started our series with some ASP.NET MVC annotations (of which there are many more). Rider and ReSharper support a large number of annotations – let’s look at a few interesting examples.īetter null safety with CanBeNull/ NotNull/ ItemCanBeNull/ ItemNotNull

Better null checks, string formatting and path completion with JetBrains Annotations.

#Jetbrains annotations how to#

What are JetBrains Annotations – and how to get them?.

Improving Rider and ReSharper code analysis using JetBrains Annotations.

In the previous blog post of our series around using JetBrains Annotations to improve Rider (and ReSharper’s) code analysis, code completion and navigation, we looked at some background: what are these annotations? And how do we add them to our source code? Now that we have them added to our code, we can look at some examples!

File-system completion with PathReference.

Better string formatting with with StringFormatMethod.

Better null safety with CanBeNull/NotNull/ItemCanBeNull/ItemNotNull.

Perhaps, we keep using for annotated services and use JetBrains java-annotations for null checking with static analysis tools. I realized that the RetentionPolicy of the Nullable annotation from Jetbrains is CLASS which means that we cannot use it in the annotated service. This.responseCauseSanitizer = requireNonNull(responseCauseSanitizer, 'responseCauseSanitizer') When was annotated to the return type, the compiler error was gone.įor example: public LoggingDecoratorBuilder responseCauseSanitizer( Unfortunately, we can not apply to a type parameter of a generic type. Kotlin disallows to return null from a BiFunction. Will be removed in Armeria LoggingDecoratorBuilder responseCauseSanitizer(Īfter ElementType.TYPE_USE was applied to #3558, public LoggingDecoratorBuilder responseCauseSanitizerFunction(

Add new methods that return Object or Void type instead of wildcard types and deprecate the original methods.

ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE, ElementType.TYPE_USE })

Add that extends and enables ElementType.TYPE_USE.

The following suggestion might make sense to resolve this problem at the moment. That means we can use on the package level.

Nullable annotation is not applicable to wildcard types and compilation also fails.Īdditionally, AFAIK, JetBrains Java annotations do not work with and there is no alternative. I was mistaken for and wildcard( ?) types to work because of the compilation cache.