cn.ponfee.commons.reflect

类 GenericUtils

java.lang.Object

cn.ponfee.commons.reflect.GenericUtils

public final class GenericUtils
extends Object

泛型工具类 https://segmentfault.com/a/1190000018319217

作者:

Ponfee

构造器概要

构造器

构造器和说明
GenericUtils()

方法概要

限定符和类型	方法和说明
static Map<String,String>	covariant(Map<String,?> origin) map泛型协变
static Map<String,String>	covariant(Properties properties)
static <T> Class<T>	getActualArgTypeArgument(Method method, int methodArgsIndex)
static <T> Class<T>	getActualArgTypeArgument(Method method, int methodArgsIndex, int genericArgsIndex) public void genericMethod(List list, Map map){}
static <T> Class<T>	getActualReturnTypeArgument(Method method)
static <T> Class<T>	getActualReturnTypeArgument(Method method, int genericArgsIndex) public List genericMethod(){}
static <T> Class<T>	getActualTypeArgument(Class<?> clazz) 获取泛型的实际类型参数
static <T> Class<T>	getActualTypeArgument(Class<?> clazz, int genericArgsIndex) public class GenericClass extends GenericSuperClass
static <T> Class<T>	getActualTypeArgument(Field field)
static <T> Class<T>	getActualTypeArgument(Field field, int genericArgsIndex) private List list; -> Long
static <T> Class<T>	getActualTypeArgument(Type type, int genericArgsIndex)
static Map<String,Class<?>>	getActualTypeVariableMapping(Class<?> clazz)
static <T> Class<T>	getFieldActualType(Class<?> clazz, Field field) public abstract class BaseEntity<I> { private I id; } public class BeanClass extends BaseEntity<String> {}
static <T> Class<T>	getFieldActualType(Class<?> clazz, String fieldName)
static List<Type>	getGenericTypes(Class<?> clazz)
static <T> Class<T>	getMethodArgActualType(Class<?> clazz, Method method, int methodArgsIndex) Returns method arg actual type public abstract class ClassA<T> { public void method(T arg) {} } public class ClassB extends classA<String>{}
static <T> Class<T>	getMethodReturnActualType(Class<?> clazz, Method method) Returns method return actual type public abstract class ClassA<T> { public T method() {} } public class ClassB extends classA<String>{}
static Class<?>	getRawType(Type type)

从类继承的方法 java.lang.Object

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

构造器详细资料

GenericUtils

public GenericUtils()

方法详细资料

covariant

public static Map<String,String> covariant(Map<String,?> origin)

map泛型协变

参数:

origin -

返回:

covariant

public static Map<String,String> covariant(Properties properties)

getActualTypeArgument

public static <T> Class<T> getActualTypeArgument(Class<?> clazz)

获取泛型的实际类型参数

参数:

clazz -

返回:

getActualTypeArgument

public static <T> Class<T> getActualTypeArgument(Class<?> clazz,
                                                 int genericArgsIndex)

public class GenericClass extends GenericSuperClass implements GenericInterface {}

参数:

clazz -

genericArgsIndex -

返回:

getActualArgTypeArgument

public static <T> Class<T> getActualArgTypeArgument(Method method,
                                                    int methodArgsIndex)

getActualArgTypeArgument

public static <T> Class<T> getActualArgTypeArgument(Method method,
                                                    int methodArgsIndex,
                                                    int genericArgsIndex)

public void genericMethod(List list, Map map){}

参数:

method - 方法对象

methodArgsIndex - 方法参数索引号

genericArgsIndex - 泛型参数索引号

返回:

getActualReturnTypeArgument

public static <T> Class<T> getActualReturnTypeArgument(Method method)

getActualReturnTypeArgument

public static <T> Class<T> getActualReturnTypeArgument(Method method,
                                                       int genericArgsIndex)

public List genericMethod(){}

参数:

method - the method

genericArgsIndex - the generic argument index

返回:

getActualTypeArgument

public static <T> Class<T> getActualTypeArgument(Field field)

getActualTypeArgument

public static <T> Class<T> getActualTypeArgument(Field field,
                                                 int genericArgsIndex)

private List list; -> Long

参数:

field - the class field

genericArgsIndex - the genericArgsIndex

返回:

getFieldActualType

public static <T> Class<T> getFieldActualType(Class<?> clazz,
                                              String fieldName)

getFieldActualType

public static <T> Class<T> getFieldActualType(Class<?> clazz,
                                              Field field)

 public abstract class BaseEntity<I> {
   private I id;
 }
 

 public class BeanClass extends BaseEntity<String> {}
 

参数:

clazz - the sub class

field - the super class defined field

返回:

a Class of field actual type

getMethodArgActualType

public static <T> Class<T> getMethodArgActualType(Class<?> clazz,
                                                  Method method,
                                                  int methodArgsIndex)

Returns method arg actual type

 public abstract class ClassA<T> {
   public void method(T arg) {}
 }
 

 public class ClassB extends classA<String>{}
 

参数:

clazz - the sub class

method - the super class defined method

methodArgsIndex - the method arg index

返回:

a Class of method arg actual type

getMethodReturnActualType

public static <T> Class<T> getMethodReturnActualType(Class<?> clazz,
                                                     Method method)

Returns method return actual type

 public abstract class ClassA<T> {
   public T method() {}
 }
 

 public class ClassB extends classA<String>{}
 

参数:

clazz - the sub class

method - the super class defined method

返回:

a Class of method return actual type

getGenericTypes

public static List<Type> getGenericTypes(Class<?> clazz)

getActualTypeVariableMapping

public static Map<String,Class<?>> getActualTypeVariableMapping(Class<?> clazz)

getRawType

public static Class<?> getRawType(Type type)

getActualTypeArgument

public static <T> Class<T> getActualTypeArgument(Type type,
                                                 int genericArgsIndex)