SimpleElementVisitor6 (Java SE 12 & JDK 12 )
Keywords: javax.lang.model.util.SimpleElementVisitor6 class

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

## Class SimpleElementVisitor6<R,​P>

- java.lang.Object
- - javax.lang.model.util.AbstractElementVisitor6<R,​P>
  - - javax.lang.model.util.SimpleElementVisitor6<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:
    `ElementVisitor<R,​P>`
  Direct Known Subclasses:
    `ElementKindVisitor6`, `SimpleElementVisitor7`

      @SupportedSourceVersion(RELEASE_6)
      public class SimpleElementVisitor6<R,​P>
      extends AbstractElementVisitor6<R,​P>

  A simple visitor of program elements with default behavior appropriate for the `RELEASE_6` source version. Visit methods corresponding to `RELEASE_6` language constructs call `defaultAction`, passing their arguments to `defaultAction`'s corresponding parameters. For constructs introduced in `RELEASE_7` and later, `visitUnknown` is called instead.

  Methods in this class may be overridden subject to their general contract. Note that annotating methods in concrete subclasses with `@Override` will help ensure that methods are overridden as intended.

  WARNING: The `ElementVisitor` 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 simple element 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:
    `SimpleElementVisitor7`, `SimpleElementVisitor8`, `SimpleElementVisitor9`

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected R` | `DEFAULT_VALUE` | Default value to be returned; `defaultAction` returns this value unless the method is overridden.

  - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `SimpleElementVisitor6()` | Deprecated. Release 6 is obsolete; update to a visitor for a newer release level.
    `protected` | `SimpleElementVisitor6​(R defaultValue)` | Deprecated. Release 6 is obsolete; update to a visitor for a newer release level.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `protected R` | `defaultAction​(Element e, P p)` | The default action for visit methods.
    `R` | `visitExecutable​(ExecutableElement e, P p)` | Visits an executable element.
    `R` | `visitPackage​(PackageElement e, P p)` | Visits a package element.
    `R` | `visitType​(TypeElement e, P p)` | Visits a type element.
    `R` | `visitTypeParameter​(TypeParameterElement e, P p)` | Visits a type parameter element.
    `R` | `visitVariable​(VariableElement e, P p)` | Visits a variable element.

    - ### Methods declared in class javax.lang.model.util.AbstractElementVisitor6

      `visit, visit, visitModule, visitUnknown`

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

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

- - ### Field Detail

    - #### DEFAULT_VALUE

          protected final R DEFAULT_VALUE

      Default value to be returned; `defaultAction` returns this value unless the method is overridden.

  - ### Constructor Detail

    - #### SimpleElementVisitor6

          @Deprecated(since="9")
          protected SimpleElementVisitor6()

      Deprecated.
      Release 6 is obsolete; update to a visitor for a newer release level.
      Constructor for concrete subclasses; uses `null` for the default value.

    - #### SimpleElementVisitor6

          @Deprecated(since="9")
          protected SimpleElementVisitor6​(R defaultValue)

      Deprecated.
      Release 6 is obsolete; update to a visitor for a newer release level.
      Constructor for concrete subclasses; uses the argument for the default value.
      Parameters:
        `defaultValue` - the value to assign to `DEFAULT_VALUE`

  - ### Method Detail

    - #### defaultAction

          protected R defaultAction​(Element e,
                                    P p)

      The default action for visit methods.
      Implementation Requirements:
        The implementation in this class just returns `DEFAULT_VALUE`; subclasses will commonly override this method.
      Parameters:
        `e` - the element to process
        `p` - a visitor-specified parameter
      Returns:
        `DEFAULT_VALUE` unless overridden

    - #### visitPackage

          public R visitPackage​(PackageElement e,
                                P p)

      Visits a package element.
      Implementation Requirements:
        This implementation calls `defaultAction`.
      Parameters:
        `e` - the element to visit
        `p` - a visitor-specified parameter
      Returns:
        a visitor-specified result

    - #### visitType

          public R visitType​(TypeElement e,
                             P p)

      Visits a type element.
      Implementation Requirements:
        This implementation calls `defaultAction`.
      Parameters:
        `e` - the element to visit
        `p` - a visitor-specified parameter
      Returns:
        a visitor-specified result

    - #### visitVariable

          public R visitVariable​(VariableElement e,
                                 P p)

      Visits a variable element.
      Implementation Requirements:
        This implementation calls `defaultAction`, unless the element is a `RESOURCE_VARIABLE` in which case `visitUnknown` is called.
      Parameters:
        `e` - the element to visit
        `p` - a visitor-specified parameter
      Returns:
        a visitor-specified result

    - #### visitExecutable

          public R visitExecutable​(ExecutableElement e,
                                   P p)

      Visits an executable element.
      Implementation Requirements:
        This implementation calls `defaultAction`.
      Parameters:
        `e` - the element to visit
        `p` - a visitor-specified parameter
      Returns:
        a visitor-specified result

    - #### visitTypeParameter

          public R visitTypeParameter​(TypeParameterElement e,
                                      P p)

      Visits a type parameter element.
      Implementation Requirements:
        This implementation calls `defaultAction`.
      Parameters:
        `e` - the element to visit
        `p` - a visitor-specified parameter
      Returns:
        a visitor-specified result