Add custom method in mapstruct-CodePudding

@Override
    @Mappings(
        {
            @Mapping(target = "temperature", source = "pac.temperature"),
            @Mapping(target = "containerId", ignore=true),

        }
    )
    TargetABC toDto(Source source);


@AfterMapping
default void inRange(Source source, @MappingTarget TargerABC target) {

    
        var temperature = source.getPac.getTemperature();
        var range = source.getRange();
        target.setContainerId(
            range.calculate(temperature)
        );
    
}

at the moment I have a solution using @AfterMapping, but I want to get rid of this approach in favor of qualifiedByName and do the mapping in the field itself by adding a method with the @Named annotation, is it possible that such a method will take two values? Maybe there is another better solution?

CodePudding user response：

You can define custom method which will accept Sourceas parameter and will make required computations. Call this method from @Mapping using expression= "java(<method_name>)".

@Mapping(target = "containerId",expression = "java(calculateContainerId(source))")
TargetABC toDto(Source source);

default String calculateContainerId(Source source) {
        var temperature = source.getPac.getTemperature();
        var range = source.getRange();
       
        return range.calculate(temperature); 
}

CodePudding user response：

The simplest solution is defining a default method for mapping source to containerId, which would MapStruct recognize and use if you define source as the source used for mapping, as shown below:

@Mapping(target = "temperature", source = "pac.temperature")
@Mapping(target = "containerId", source = "source")
TargerABC toDto(Source source);

default Integer calculateContainerIdFromSource(Source source) {
  var temperature = source.getPac().getTemperature();
  var range = source.getRange();
  return range.calculate(temperature);
}