AbstractTypeVisitor6 (Java SE 14 & JDK 14)
Description: declaration: module: java.compiler, package: javax.lang.model.util, class: AbstractTypeVisitor6
Keywords: javax.lang.model.util.AbstractTypeVisitor6 class

Module java.compiler
Package javax.lang.model.util

# Class AbstractTypeVisitor6<R,​P>

java.lang.Object
javax.lang.model.util.AbstractTypeVisitor6<R,​P>

Type Parameters:
  `R` - the return type of this visitor's methods. Use `Void` for visitors that do not need to return results.
  `P` - the type of the additional parameter to this visitor's methods. Use `Void` for visitors that do not need an additional parameter.

All Implemented Interfaces:
  `TypeVisitor<R,​P>`

Direct Known Subclasses:
  `AbstractTypeVisitor7`, `SimpleTypeVisitor6`

    @SupportedSourceVersion(RELEASE_6)
    public abstract class AbstractTypeVisitor6<R,​P>
    extends Object
    implements TypeVisitor<R,​P>

A skeletal visitor of types with default behavior appropriate for the `RELEASE_6` source version.

WARNING: The `TypeVisitor` interface implemented by this class may have methods added to it in the future to accommodate new, currently unknown, language structures added to future versions of the Java™ programming language. Therefore, methods whose names begin with `"visit"` may be added to this class in the future; to avoid incompatibilities, classes which extend this class should not declare any instance methods with names beginning with `"visit"`.

When such a new visit method is added, the default implementation in this class will be to call the `visitUnknown` method. A new abstract type visitor class will also be introduced to correspond to the new language level; this visitor will have different default behavior for the visit method in question. When the new visitor is introduced, all or portions of this visitor may be deprecated.

Since:
  1.6
See Also:
  `AbstractTypeVisitor7`, `AbstractTypeVisitor8`, `AbstractTypeVisitor9`, `AbstractTypeVisitor14`

- ## Constructor Summary

  Constructors
  Modifier | Constructor | Description
  --- | --- | ---
  `protected` | `AbstractTypeVisitor6()` | Deprecated. Release 6 is obsolete; update to a visitor for a newer release level.

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `R` | `visit​(TypeMirror t)` | Visits any type mirror as if by passing itself to that type mirror's `accept` method and passing `null` for the additional parameter.
  `R` | `visit​(TypeMirror t, P p)` | Visits any type mirror as if by passing itself to that type mirror's `accept` method.
  `R` | `visitIntersection​(IntersectionType t, P p)` | Visits an intersection type.
  `R` | `visitUnion​(UnionType t, P p)` | Visits a union type.
  `R` | `visitUnknown​(TypeMirror t, P p)` | Visits an unknown kind of type.

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods declared in interface javax.lang.model.type.TypeVisitor

  `visitArray, visitDeclared, visitError, visitExecutable, visitNoType, visitNull, visitPrimitive, visitTypeVariable, visitWildcard`

- ## Constructor Details

  - ### AbstractTypeVisitor6

    @Deprecated(since="9") protected AbstractTypeVisitor6()
    Deprecated.
    Release 6 is obsolete; update to a visitor for a newer release level.
    Constructor for concrete subclasses to call.

- ## Method Details

  - ### visit

    public final R visit​(TypeMirror t, P p)
    Visits any type mirror as if by passing itself to that type mirror's `accept` method. The invocation `v.visit(t, p)` is equivalent to `t.accept(v, p)`.
    Specified by:
      `visit` in interface `TypeVisitor<R,​P>`
    Parameters:
      `t` - the type to visit
      `p` - a visitor-specified parameter
    Returns:
      a visitor-specified result

  - ### visit

    public final R visit​(TypeMirror t)
    Visits any type mirror as if by passing itself to that type mirror's `accept` method and passing `null` for the additional parameter. The invocation `v.visit(t)` is equivalent to `t.accept(v, null)`.
    Specified by:
      `visit` in interface `TypeVisitor<R,​P>`
    Parameters:
      `t` - the type to visit
    Returns:
      a visitor-specified result

  - ### visitUnion

    public R visitUnion​(UnionType t, P p)
    Visits a union type.
    Specified by:
      `visitUnion` in interface `TypeVisitor<R,​P>`
    Implementation Requirements:
      Visits a `UnionType` element by calling `visitUnknown`.
    Parameters:
      `t` - the type to visit
      `p` - a visitor-specified parameter
    Returns:
      the result of `visitUnknown`
    Since:
      1.7

  - ### visitIntersection

    public R visitIntersection​(IntersectionType t, P p)
    Visits an intersection type.
    Specified by:
      `visitIntersection` in interface `TypeVisitor<R,​P>`
    Implementation Requirements:
      Visits an `IntersectionType` element by calling `visitUnknown`.
    Parameters:
      `t` - the type to visit
      `p` - a visitor-specified parameter
    Returns:
      the result of `visitUnknown`
    Since:
      1.8

  - ### visitUnknown

    public R visitUnknown​(TypeMirror t, P p)
    Visits an unknown kind of type. This can occur if the language evolves and new kinds of types are added to the `TypeMirror` hierarchy.
    Specified by:
      `visitUnknown` in interface `TypeVisitor<R,​P>`
    Implementation Requirements:
      The default implementation of this method in `AbstractTypeVisitor6` will always throw `new UnknownTypeException(t, p)`. This behavior is not required of a subclass.
    Parameters:
      `t` - the type to visit
      `p` - a visitor-specified parameter
    Returns:
      a visitor-specified result
    Throws:
      `UnknownTypeException` - a visitor implementation may optionally throw this exception