org.springframework.asm

## 类 FieldVisitor

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

-     public abstract class FieldVisitor
      extends Object

  A visitor to visit a Java field. The methods of this class must be called in the following order: ( `visitAnnotation` | `visitTypeAnnotation` | `visitAttribute` )* `visitEnd`.
  作者:
    Eric Bruneton

- - ### 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 FieldVisitor` | `fv` The field visitor to which this visitor must delegate method calls.

  - ### 构造器概要

    构造器
    构造器和说明
    `FieldVisitor(int api)` Constructs a new `FieldVisitor`.
    `FieldVisitor(int api, FieldVisitor fv)` Constructs a new `FieldVisitor`.

  - ### 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
    --- | ---
    `AnnotationVisitor` | `visitAnnotation(String desc, boolean visible)` Visits an annotation of the field.
    `void` | `visitAttribute(Attribute attr)` Visits a non standard attribute of the field.
    `void` | `visitEnd()` Visits the end of the field.
    `AnnotationVisitor` | `visitTypeAnnotation(int typeRef, TypePath typePath, String desc, boolean visible)` Visits an annotation on the type of the field.

    - ### 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`.

    - #### fv

          protected FieldVisitor fv

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

  - ### 构造器详细资料

    - #### FieldVisitor

          public FieldVisitor(int api)

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

    - #### FieldVisitor

          public FieldVisitor(int api,
                              FieldVisitor fv)

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

  - ### 方法详细资料

    - #### visitAnnotation

          public AnnotationVisitor visitAnnotation(String desc,
                                                   boolean visible)

      Visits an annotation of the field.
      参数:
        `desc` - the class descriptor of the annotation class.
        `visible` - `true` if the annotation is visible at runtime.
      返回:
        a visitor to visit the annotation values, or `null` if this visitor is not interested in visiting this annotation.

    - #### visitTypeAnnotation

          public AnnotationVisitor visitTypeAnnotation(int typeRef,
                                                       TypePath typePath,
                                                       String desc,
                                                       boolean visible)

      Visits an annotation on the type of the field.
      参数:
        `typeRef` - a reference to the annotated type. The sort of this type reference must be `FIELD`. See `TypeReference`.
        `typePath` - the path to the annotated type argument, wildcard bound, array element type, or static inner type within 'typeRef'. May be `null` if the annotation targets 'typeRef' as a whole.
        `desc` - the class descriptor of the annotation class.
        `visible` - `true` if the annotation is visible at runtime.
      返回:
        a visitor to visit the annotation values, or `null` if this visitor is not interested in visiting this annotation.

    - #### visitAttribute

          public void visitAttribute(Attribute attr)

      Visits a non standard attribute of the field.
      参数:
        `attr` - an attribute.

    - #### visitEnd

          public void visitEnd()

      Visits the end of the field. This method, which is the last one to be called, is used to inform the visitor that all the annotations and attributes of the field have been visited.