org.objectweb.asm

## Class AnnotationVisitor

- java.lang.Object
- - org.objectweb.asm.AnnotationVisitor

- Direct Known Subclasses:
    AnnotationNode, CheckAnnotationAdapter, RemappingAnnotationAdapter, SAXAnnotationAdapter, TraceAnnotationVisitor

      public abstract class AnnotationVisitor
      extends Object

  A visitor to visit a Java annotation. The methods of this class must be called in the following order: ( `visit` | `visitEnum` | `visitAnnotation` | `visitArray` )* `visitEnd`.
  Author:
    Eric Bruneton, Eugene Kuleshov

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected int` | `api` The ASM API version implemented by this visitor.
    `protected AnnotationVisitor` | `av` The annotation visitor to which this visitor must delegate method calls.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AnnotationVisitor(int api)` Constructs a new `AnnotationVisitor`.
    `AnnotationVisitor(int api, AnnotationVisitor av)` Constructs a new `AnnotationVisitor`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `visit(String name, Object value)` Visits a primitive value of the annotation.
    `AnnotationVisitor` | `visitAnnotation(String name, String desc)` Visits a nested annotation value of the annotation.
    `AnnotationVisitor` | `visitArray(String name)` Visits an array value of the annotation.
    `void` | `visitEnd()` Visits the end of the annotation.
    `void` | `visitEnum(String name, String desc, String value)` Visits an enumeration value of the annotation.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### api

          protected final int api

      The ASM API version implemented by this visitor. The value of this field must be one of `Opcodes.ASM4` or `Opcodes.ASM5`.

    - #### av

          protected AnnotationVisitor av

      The annotation visitor to which this visitor must delegate method calls. May be null.

  - ### Constructor Detail

    - #### AnnotationVisitor

          public AnnotationVisitor(int api)

      Constructs a new `AnnotationVisitor`.
      Parameters:
        `api` - the ASM API version implemented by this visitor. Must be one of `Opcodes.ASM4` or `Opcodes.ASM5`.

    - #### AnnotationVisitor

          public AnnotationVisitor(int api,
                                   AnnotationVisitor av)

      Constructs a new `AnnotationVisitor`.
      Parameters:
        `api` - the ASM API version implemented by this visitor. Must be one of `Opcodes.ASM4` or `Opcodes.ASM5`.
        `av` - the annotation visitor to which this visitor must delegate method calls. May be null.

  - ### Method Detail

    - #### visit

          public void visit(String name,
                            Object value)

      Visits a primitive value of the annotation.
      Parameters:
        `name` - the value name.
        `value` - the actual value, whose type must be `Byte`, `Boolean`, `Character`, `Short`, `Integer` , `Long`, `Float`, `Double`, `String` or `Type` or OBJECT or ARRAY sort. This value can also be an array of byte, boolean, short, char, int, long, float or double values (this is equivalent to using `visitArray` and visiting each array element in turn, but is more convenient).

    - #### visitEnum

          public void visitEnum(String name,
                                String desc,
                                String value)

      Visits an enumeration value of the annotation.
      Parameters:
        `name` - the value name.
        `desc` - the class descriptor of the enumeration class.
        `value` - the actual enumeration value.

    - #### visitAnnotation

          public AnnotationVisitor visitAnnotation(String name,
                                                   String desc)

      Visits a nested annotation value of the annotation.
      Parameters:
        `name` - the value name.
        `desc` - the class descriptor of the nested annotation class.
      Returns:
        a visitor to visit the actual nested annotation value, or `null` if this visitor is not interested in visiting this nested annotation. The nested annotation value must be fully visited before calling other methods on this annotation visitor.

    - #### visitArray

          public AnnotationVisitor visitArray(String name)

      Visits an array value of the annotation. Note that arrays of primitive types (such as byte, boolean, short, char, int, long, float or double) can be passed as value to `visit`. This is what `ClassReader` does.
      Parameters:
        `name` - the value name.
      Returns:
        a visitor to visit the actual array value elements, or `null` if this visitor is not interested in visiting these values. The 'name' parameters passed to the methods of this visitor are ignored. All the array values must be visited before calling other methods on this annotation visitor.

    - #### visitEnd

          public void visitEnd()

      Visits the end of the annotation.