xdean.annotation

枚举 MethodRef.Type

java.lang.Object

java.lang.Enum<MethodRef.Type>

xdean.annotation.MethodRef.Type

所有已实现的接口:

Serializable, Comparable<MethodRef.Type>

封闭类:

MethodRef

public static enum MethodRef.Type
extends Enum<MethodRef.Type>

枚举常量概要

枚举常量

枚举常量和说明
ALL Annotated on a String attribute, its value will be parsed to class name and method name.
CLASS Only used with METHOD
METHOD Annotated on a String attribute, it has following modes: Use with another attribute with type=CLASS(also can set a parent class), reference method from class by the other attribute's value Use with MethodRef.defaultClass(), reference method from the determined class Use with MethodRef.parentClass(), reference method from class by its EnclosingElement(usually a class)'s annotation's value Example: 1.

方法概要

限定符和类型	方法和说明
static MethodRef.Type	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static MethodRef.Type[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

ALL

public static final MethodRef.Type ALL

Annotated on a String attribute, its value will be parsed to class name and method name.

Example:

 
    //define
    @interface UseAll {
      @MethodRef //default type is All
      String value();
    }

    //usage
    @UseAll("java.lang.String:length")
    void func();

    
 

另请参阅:

MethodRef.splitor()

CLASS

public static final MethodRef.Type CLASS

Only used with METHOD

另请参阅:

METHOD

METHOD

public static final MethodRef.Type METHOD

Annotated on a String attribute, it has following modes:

• Use with another attribute with type=CLASS(also can set a parent class), reference method from class by the other attribute's value
• Use with MethodRef.defaultClass(), reference method from the determined class
• Use with MethodRef.parentClass(), reference method from class by its EnclosingElement(usually a class)'s annotation's value

Example:
1. Note that if you use Class and Method, there must have and only have 2 attribute with @MethodRef. And the Class attribute can also set a parent class, if the class value is void.class, the parent annotation value will be used.

 
    //define
    @interface UseClassAndMethod {
      @MethodRef(type = Type.CLASS)
      Class<? extends Number> type();

      @MethodRef(type = Type.METHOD)
      String method();
    }

    //usage
    @UseClassAndMethod(type = Integer.class, method = "intValue")
    void func();
    
 

 
    //define
    @interface UseClassAndMethodWithParent {
      @interface Parent {
        Class<?> value();
      }

      @MethodRef(type = Type.CLASS, parentClass = Parent.class)
      Class<?> type() default void.class;

      @MethodRef(type = Type.METHOD)
      String method();
    }

    //usage
    @Parent(Integer.class)
    class Bar{
      @UseClassAndMethodWithParent(method = "intValue")
      void func();
    }
    
 

2.

 
    //define
    @interface UseDefaultClass {
      @MethodRef(type = Type.METHOD, defaultClass = String.class)
      String method();
    }

    //usage
    @UseDefaultClass(method = "length")
    void func();
    
 

3. Note that the parent annotation must have a Class attribute named 'value'.

 
    //define
    @interface UseParentClass {
      @interface Parent {
        Class<?> value();
      }

      @MethodRef(type = Type.METHOD, parentClass = Parent.class)
      String method();
    }

    //usage
    @Parent(String.class)
    class Bar{
      @UseParentClass(method = "length")
      void func();
    }
    
 

方法详细资料

values

public static MethodRef.Type[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (MethodRef.Type c : MethodRef.Type.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static MethodRef.Type valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值