@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE,CONSTRUCTOR,METHOD})
public @interface Builder
@Builder AST transformation is used to help write classes that can be created using fluent api calls.
 The transform supports multiple building strategies to cover a range of cases and there are a number
 of configuration options to customize the building process.
 In addition, a number of annotation attributes let you customise the building process. Not all annotation attributes
 are supported by all strategies. See the individual strategy documentation for more details.
 If you're an AST hacker, you can also define your own strategy class.
 The following strategies are bundled with Groovy:
 SimpleStrategy for creating chained settersExternalStrategy where you annotate an explicit builder class while leaving some buildee class being built untouchedDefaultStrategy which creates a nested helper class for instance creationInitializerStrategy which creates a nested helper class for instance creation which when used with @CompileStatic allows type-safe object creationnew Person(firstName: "Robert", lastName: "Lewandowski", age: 21)or the with statement:
 new Person().with {
     firstName = "Robert"
     lastName = "Lewandowski"
     age = 21
 }
 
 so you might not find value in using the builder transform at all. But if you need Java integration or in some cases improved type safety, the @Builder transform might prove very useful.SimpleStrategy, 
ExternalStrategy, 
DefaultStrategy, 
InitializerStrategy| Modifier and Type | Optional Element and Description | 
|---|---|
| java.lang.String | builderClassNameFor strategies which create a builder helper class, the class name to use for the helper class. | 
| java.lang.String | builderMethodNameThe method name to use for a builder factory method in the source class for easy access of the
 builder helper class for strategies which create such a helper class. | 
| java.lang.Class<? extends BuilderASTTransformation.BuilderStrategy> | builderStrategyA class capturing the builder strategy | 
| java.lang.String | buildMethodNameFor strategies which create a builder helper class that creates the instance, the method name to call to create the instance. | 
| java.lang.String[] | excludesList of field and/or property names to exclude from generated builder methods. | 
| java.lang.Class | forClassA class for which builder methods should be created. | 
| java.lang.String[] | includesList of field and/or property names to include within the generated builder methods. | 
| java.lang.String | prefixThe prefix to use when creating the setter methods. | 
public abstract java.lang.Class forClass
public abstract java.lang.Class<? extends BuilderASTTransformation.BuilderStrategy> builderStrategy
public abstract java.lang.String prefix
public abstract java.lang.String builderClassName
forClass since in such cases the builder class is explicitly supplied.
 Default is determined by the strategy, e.g. TargetClass + "Builder" or TargetClass + "Initializer".public abstract java.lang.String buildMethodName
public abstract java.lang.String builderMethodName
forClass.
 Default is determined by the strategy, e.g. builder or createInitializer.public abstract java.lang.String[] excludes
public abstract java.lang.String[] includes