mapstruct | annotation processor for generating type | Build Tool library
kandi X-RAY | mapstruct Summary
kandi X-RAY | mapstruct Summary
MapStruct is a Java annotation processor for the generation of type-safe and performant mappers for Java bean classes. It saves you from writing mapping code by hand, which is a tedious and error-prone task. The generator comes with sensible defaults and many built-in type conversions, but it steps out of your way when it comes to configuring or implementing special behavior.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Registers the given Mapper
- Remove duplicate annotations
- Adjusts the decorator for the given Mapper
- Creates an annotated constructor for a component model class
- Determine the matching methods
- Gets the qualifiers annotations from the source method
- Returns a list of matching methods that match the given criteria
- Gets the xml element ref
- Start the downloader
- Downloads a file from a URL
- Registers java 8 time conversion
- Compares two NestedPropertyMappingMethod objects
- Get the final final method for the builder
- Create a new source reference
- Determine and return the matching methods
- Given a type element return the fully qualified name
- Gets the bound types
- Creates MappingReferences for given source method
- Compares two MappingReferences
- Returns true if the target types match the given parameters
- Registers the jodaTime conversions
- Determine the matching methods for the given source types
- Write characters
- Initializes the mapper
- Process annotations
- Builds an assignment
mapstruct Key Features
mapstruct Examples and Code Snippets
Community Discussions
Trending Discussions on mapstruct
QUESTION
I'm having the following error when I run the command mvn clean install:
ANSWER
Answered 2021-Aug-17 at 17:20I am not sure how Kotlin works with multiple classes in one source file.
What I would suggest is that you use dedicated files for the decorator and the mapper. That way MapStruct will create the correct code.
MapStruct is a Java annotation processor, we do not know anything about the Kotlin structure. It seems like the packages returned by the java annotation processing API are not correct.
QUESTION
Here is my Service class.
...ANSWER
Answered 2022-Mar-16 at 09:11Take a closer look in your Dto AnswerDetailResponse
QUESTION
I'm still a basic learner for Unit Test.
I'm trying to mock my class's method without directly calling it(since it is dependent on 3rd party library) and I wrote a test method like below.
(The 3rd party library which I mentioned is not MapStruct, it is ModelObject.class and it has very complicated parameters for the constructor and is only available to initialize in library level)
The ProjectMapper class's toDto method is a simple object mapping method(with MapStruct library).
ANSWER
Answered 2022-Mar-14 at 09:34You mocked your object under test and stubbed method under test - and you correctly concuded that such a test brings no benefit.
You are checking that you can stub a method, not your production code.
The main problem is your assumption that you need to mock every 3rd party class. This is wrong way of thinking - you should try to mock collaborators of your class (especially ones that cause side-effects unwanted in the test environment), but not the classes which are critical part of implementation of your class. The line might be sometimes blurry, but in this concrete example I strongly recommend NOT mocking the mapper:
- your 3rd party class is driven by annotations
- the annotations must correspond to your DTOs fields
- the field names in annotations are Strings, their presence is DTOs is not enforced by compiler
- all mapping is done in the memory
Creating a test that exercises production code gives you confidence that:
- field names are correct
- corresponding mapped fields have correct types (for example, you are not mapping int to boolean)
The linked test of the service is somewhat different: it tests a Spring service which calls the repository. The repository presumably represents some DB, which interacts with the outside world - it is a good candidate for a mock. To my eyes the service method only forwards the call to the repository - which is a trivial behaviour - so the test is trivial, but this setup will scale for more complicated service methods.
Update
Mocking source class for MapStruct.
If ModelObject is complicated to create, consider using mocks for some of its constructor parameters.
QUESTION
I am experimenting with MapStruct where I want to have a mapper use another mapper to combine multiple objects into one. For my tests I have three domain objects, DomainObject1, DomainObject2 and DomainObject3. I want to convert DomainObject1 to a DTO, TransferObjectA, which has a field containing a second DTO, TransferObjectB, that is constructed using DomainObject2 and DomainObject3.
I have two mappers, one that converts DomainObject2 and DomainObject3 to TransferObjectB which ignores a field in DomainObject2 so it isn't converted:
ANSWER
Answered 2022-Mar-12 at 06:28MapStruct currently can only use other mappers with a single source parameter. There is an open feature request mapstruct/mapstruct#2081 about this functionality.
What you could do is to use a wrapper object instead of multiple source parameters.
QUESTION
First time using MapStruct (1.5.0.Beta2)
Say I have the following class hierarchy: C extends B extends A and Cdto extends Bdto extends Adto. And the following mapper:
ANSWER
Answered 2022-Mar-01 at 06:58This is by design. The reason for this is to let the user control the order for the mappings. The same behavior is used for @Mapping annotations.
Your first example should also get a compiler warning, although it might refer to the wrong type (target instead of source) at the moment. This should be fixed in the next release.
QUESTION
MapStruct generates code at compile-time and it should not require any runtime dependencies:
How is MapStruct different from other bean mapping tools?
Unlike most other bean mapping tools, MapStruct doesn’t work at runtime but is a compile-time code generator.
Generating mapping code at build time has many advantages:
- Excellent performance, as no reflection or byte code generation at runtime is needed; the generated code contains plain method invocations, just as if the mapper was hand-written
- No runtime dependencies, making MapStruct a great solution for Android applications
Which dependency scope should be used in a Maven project? Should MapStruct be included as a provided dependency?
...ANSWER
Answered 2022-Feb-12 at 08:23The org.mapstruct:mapstruct dependency contains the needed annotations to signal the org.mapstruct:mapstruct-processor what to do.
It also contains the Mappers factory that is used when using the default component model. Therefore, the scope of org.mapstruct:mapstruct depends on the component model that you are using:
If you are using this component model then you need org.mapstruct:mapstruct during runtime if you are using Mappers or if you have dependencies between different mappers.
In theory you can use the default component model and instantiate your own mappers. However, dependencies between mappers are still going to use Mappers, unless you have instantiated your mapper in MyMapper.INSTANCE somehow already, then MapStruct will use MyMapper.INSTANCE to get the instance of the MyMapper. This would mean that you can still use the same scope as the other component models (see below for more information)
In this case you do not need org.mapstruct:mapstruct during runtime and you can use true with provided.
With Gradle this would be compileOnly dependency.
Note: Be careful when using Spring Boot and provided the Spring Boot maven plugin will still include the org.mapstruct:mapstruct dependency in the final provided jar. You'll need to ignore it by configuring the Spring Boot Maven plugin.
QUESTION
I would like MapStruct to map every property of my Object, except for one particular one for which I would like to provide a custom mapping.
So far, I implemented the whole mapper myself, but every time I add a new property to my Entity, I forget to update the mapper.
...ANSWER
Answered 2021-Oct-19 at 18:15MapStruct has a way to use custom mapping between some fields. So in your case you can do someting like:
QUESTION
Calling mvn clean compile -X
shows the following (few dependencies omitted to stay in question max char size):
...ANSWER
Answered 2022-Jan-17 at 19:13I've tried your example:
QUESTION
I have a mapper that, for a particular attribute of the target class, needs to choose one from a list of objects inside the source object, and map it using a differente mapper class.
Simplifying it a lot, the Game class contains a list of Transaction objects, and my GameMapper class looks like this:
ANSWER
Answered 2021-Nov-17 at 14:59I managed to find a hacky solution. By adding a List dummy(List transaction); method to GameMapper, I have tricked MapStruct into thinking I'm really using TransactionMapper for something and it has successfully added it to GameMapperImpl.
I'm still open to non-hacky solutions, though :)
QUESTION
How can I use MapStruct to create a mapper that maps from Model entity that includes one list of objects and one another object to Domain entity, consists of only list of nested objects.
My Model entity list object = SourceObject-A;
My Model entity second object = SourceObject-B;
My Doamin entity list object = TargetObject-AB;
My source classes looks like this:
SourceObject-A:
...ANSWER
Answered 2021-Oct-09 at 07:51You could do something like this in your mapper:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install mapstruct
You can use mapstruct like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the mapstruct component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
