Implicit Transformers
Useful transformers for subclasses mapping.
In this guide, we'll review two new built in transformers added in ShapeShift version 0.0.7,
ImplicitMappingTransformer and ImplicitCollectionMappingTransformer.ImplicitMappingTransformer is used to transform subclasses mapped with ShapeShift. Lets look at the following example:
We have mapped
Address class to its display class AddressDisplay.Kotlin
Java
@DefaultMappingTarget(AddressDisplay::class)
class Address {
@MappedField
var country: String? = null
@MappedField
var city: String? = null
@MappedField
var address: String? = null
}
class AddressDisplay {
var country: String? = null
var city: String? = null
var address: String? = null
}
@DefaultMappingTarget(AddressDisplay::class)
public class Address {
@MappedField
private String country;
@MappedField
private String city;
@MappedField
private String address;
// Getters and Setters...
}
public class AddressDisplay {
private String country;
private String city;
private String address;
// Getters and Setters...
}
We can use ShapeShift to map
Address to AddressDisplay. But what we do if Address is a subclass? We use the ImplicitMappingTransformer.Kotlin
Java
@DefaultMappingTarget(UserDisplay::class)
class User {
@MappedField
var name: String? = null
@MappedField(transformer = ImplicitMappingTransformer::class)
var address: Address? = null
}
class UserDisplay {
var name: String? = null
var address: AddressDisplay? = null
}
@DefaultMappingTarget(UserDisplay::class)
public class User {
@MappedField
private String name;
@MappedField(transformer = ImplicitMappingTransformer.class)
private Address address;
// Getters and Setters...
}
public class UserDisplay {
private String name;
private AddressDisplay address;
// Getters and Setters...
}
The
ImplicitMappingTransformer uses the ShapeShift instance internally to map Address to AddressDisplay.ImplicitCollectionMappingTransformer has the same job as ImplicitMappingTransformer but for collections.Kotlin
Java
@DefaultMappingTarget(UserDisplay::class)
class User {
@MappedField
var name: String? = null
@MappedField(transformer = ImplicitCollectionMappingTransformer::class)
var addresses: List<Address>? = null
}
class UserDisplay {
var name: String? = null
var addresses: List<AddressDisplay>? = null
}
@DefaultMappingTarget(UserDisplay::class)
public class User {
@MappedField
private String name;
@MappedField(transformer = ImplicitCollectionMappingTransformer.class)
private List<Address> addresses;
// Getters and Setters...
}
public class UserDisplay {
private String name;
private List<AddressDisplay> addresses;
// Getters and Setters...
}
Last modified 6mo ago