Source value mapped more than once inspection for @ValueMapping

For value mappings a source value can only be mapped once. For example

import org.mapstruct.Mapper;
import org.mapstruct.ValueMapping;

@Mapper
public interface ValueMapper {

    enum A {
        A,B
    }

    enum B {
        A,B
    }

    @ValueMapping(source = "A", target = "B")
    @ValueMapping(source = "A", target = "A")
    A from(B b);
}

is invalide as source A is mapped twice. MapStruct report this as

Source value mapping: "A" cannot be mapped more than once.

Currently the plugin does not recognize this as an error. An inspection should be added for this.

For normal mappings there is already an inspection implemented and could be used as an example: https://github.com/mapstruct/mapstruct-idea/blob/main/src/main/java/org/mapstruct/intellij/inspection/TargetPropertyMappedMoreThanOnceInspection.java.

Commencez par src/main/java/org/mapstruct/intellij/inspection/TargetPropertyMappedMoreThanOnceInspection.java, qui fournit le modèle d’inspection existant. Suivez la façon dont il détecte les mappings normaux en double, puis appliquez la même approche aux valeurs source de @ValueMapping. C’est terminé lorsque les valeurs source en double sont reconnues et signalées avec le message d’erreur attendu.