# 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.

API Note:

  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 and subclasses 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 directly or indirectly 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 a new visitor is introduced, portions of this visitor class may be deprecated, including its constructors.

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Release 6 is obsolete; update to a visitor for a newer release level.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
`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.
`final 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 Object

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

### Methods declared in interface 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