org.springframework.asm

## 类 AnnotationVisitor

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

-     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`.
  作者:
    Eric Bruneton, Eugene Kuleshov

- - ### 字段概要

    字段
    限定符和类型 | 字段和说明
    --- | ---
    `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.

  - ### 构造器概要

    构造器
    构造器和说明
    `AnnotationVisitor(int api)` Constructs a new `AnnotationVisitor`.
    `AnnotationVisitor(int api, AnnotationVisitor av)` Constructs a new `AnnotationVisitor`.

  - ### 方法概要

    所有方法 实例方法 具体方法
    限定符和类型 | 方法和说明
    --- | ---
    `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.

    - ### 从类继承的方法 java.lang.Object

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

- - ### 字段详细资料

    - #### api

          protected final int api

      The ASM API version implemented by this visitor. The value of this field must be one of `Opcodes.ASM4`, `Opcodes.ASM5` or `Opcodes.ASM6`.

    - #### av

          protected AnnotationVisitor av

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

  - ### 构造器详细资料

    - #### AnnotationVisitor

          public AnnotationVisitor(int api)

      Constructs a new `AnnotationVisitor`.
      参数:
        `api` - the ASM API version implemented by this visitor. Must be one of `Opcodes.ASM4`, `Opcodes.ASM5` or `Opcodes.ASM6`.

    - #### AnnotationVisitor

          public AnnotationVisitor(int api,
                                   AnnotationVisitor av)

      Constructs a new `AnnotationVisitor`.
      参数:
        `api` - the ASM API version implemented by this visitor. Must be one of `Opcodes.ASM4`, `Opcodes.ASM5` or `Opcodes.ASM6`.
        `av` - the annotation visitor to which this visitor must delegate method calls. May be null.

  - ### 方法详细资料

    - #### visit

          public void visit(String name,
                            Object value)

      Visits a primitive value of the annotation.
      参数:
        `name` - the value name.
        `value` - the actual value, whose type must be `Byte`, `Boolean`, `Character`, `Short`, `Integer` , `Long`, `Float`, `Double`, `String` or `Type` of 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.
      参数:
        `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.
      参数:
        `name` - the value name.
        `desc` - the class descriptor of the nested annotation class.
      返回:
        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.
      参数:
        `name` - the value name.
      返回:
        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.