net.hasor.cobble.reflect.resolvable

类 ResolvableType

java.lang.Object

net.hasor.cobble.reflect.resolvable.ResolvableType

所有已实现的接口:

Serializable

public class ResolvableType
extends Object
implements Serializable

Encapsulates a Java Type, providing access to supertypes, interfaces, and generic parameters along with the ability to ultimately resolve to a Class.

ResolvableTypes may be obtained from fields, method parameters, method returns or classes. Most methods on this class will themselves return ResolvableTypes, allowing easy navigation. For example:

 private HashMap<Integer, List<String>> myMap;

 public void example() {
     ResolvableType t = ResolvableType.forField(getClass().getDeclaredField("myMap"));
     t.getSuperType(); // AbstractMap<Integer, List<String>>
     t.asMap(); // Map<Integer, List<String>>
     t.getGeneric(0).resolve(); // Integer
     t.getGeneric(1).resolve(); // List
     t.getGeneric(1); // List<String>
     t.resolveGeneric(1, 0); // String
 }
 

2021-11-01 reduction based on SpringFramework, org.springframework.core.ResolvableType

从以下版本开始:

4.0

作者:

赵永春 (zyc@hasor.net), Phillip Webb, Juergen Hoeller, Stephane Nicoll

另请参阅:

forField(Field), forMethodParameter(Method, int), forMethodReturnType(Method), forConstructorParameter(Constructor, int), forClass(Class), forType(Type), 序列化表格

字段概要

字段

限定符和类型	字段和说明
static ResolvableType	NONE ResolvableType returned when no value is available.

方法概要

限定符和类型	方法和说明
ResolvableType	as(Class<?> type) Return this type as a ResolvableType of the specified class.
ResolvableType	asCollection() Convenience method to return this type as a resolvable Collection type.
ResolvableType	asMap() Convenience method to return this type as a resolvable Map type.
static void	clearCache() Clear the internal ResolvableType/SerializableTypeWrapper cache.
boolean	equals(Object other)
static ResolvableType	forArrayComponent(ResolvableType componentType) Return a ResolvableType as a array of the specified componentType.
static ResolvableType	forClass(Class<?> clazz) Return a ResolvableType for the specified Class, using the full generic type information for assignability checks.
static ResolvableType	forClass(Class<?> baseType, Class<?> implementationClass) Return a ResolvableType for the specified base type (interface or base class) with a given implementation class.
static ResolvableType	forClassWithGenerics(Class<?> clazz, Class<?>... generics) Return a ResolvableType for the specified Class with pre-declared generics.
static ResolvableType	forClassWithGenerics(Class<?> clazz, ResolvableType... generics) Return a ResolvableType for the specified Class with pre-declared generics.
static ResolvableType	forConstructorParameter(Constructor<?> constructor, int parameterIndex) Return a ResolvableType for the specified Constructor parameter.
static ResolvableType	forConstructorParameter(Constructor<?> constructor, int parameterIndex, Class<?> implementationClass) Return a ResolvableType for the specified Constructor parameter with a given implementation.
static ResolvableType	forField(Field field) Return a ResolvableType for the specified Field.
static ResolvableType	forField(Field field, Class<?> implementationClass) Return a ResolvableType for the specified Field with a given implementation.
static ResolvableType	forField(Field field, int nestingLevel) Return a ResolvableType for the specified Field with the given nesting level.
static ResolvableType	forField(Field field, int nestingLevel, Class<?> implementationClass) Return a ResolvableType for the specified Field with a given implementation and the given nesting level.
static ResolvableType	forField(Field field, ResolvableType implementationType) Return a ResolvableType for the specified Field with a given implementation.
static ResolvableType	forMethodParameter(Method method, int parameterIndex) Return a ResolvableType for the specified Method parameter.
static ResolvableType	forMethodParameter(Method method, int parameterIndex, Class<?> implementationClass) Return a ResolvableType for the specified Method parameter with a given implementation.
static ResolvableType	forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter) Return a ResolvableType for the specified MethodParameter.
static ResolvableType	forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter, ResolvableType implementationType) Return a ResolvableType for the specified MethodParameter with a given implementation type.
static ResolvableType	forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter, Type targetType) Return a ResolvableType for the specified MethodParameter, overriding the target type to resolve with a specific given type.
static ResolvableType	forMethodReturnType(Method method) Return a ResolvableType for the specified Method return type.
static ResolvableType	forMethodReturnType(Method method, Class<?> implementationClass) Return a ResolvableType for the specified Method return type.
static ResolvableType	forRawClass(Class<?> clazz) Return a ResolvableType for the specified Class, doing assignability checks against the raw class only (analogous to Class.isAssignableFrom(java.lang.Class<?>), which this serves as a wrapper for.
static ResolvableType	forType(Type type) Return a ResolvableType for the specified Type.
static ResolvableType	forType(Type type, ResolvableType owner) Return a ResolvableType for the specified Type backed by the given owner type.
ResolvableType	getComponentType() Return the ResolvableType representing the component type of the array or NONE if this type does not represent an array.
ResolvableType	getGeneric(int... indexes) Return a ResolvableType representing the generic parameter for the given indexes.
ResolvableType[]	getGenerics() Return an array of ResolvableTypes representing the generic parameters of this type.
ResolvableType[]	getInterfaces() Return a ResolvableType array representing the direct interfaces implemented by this type.
ResolvableType	getNested(int nestingLevel) Return a ResolvableType for the specified nesting level.
ResolvableType	getNested(int nestingLevel, Map<Integer,Integer> typeIndexesPerLevel) Return a ResolvableType for the specified nesting level.
Class<?>	getRawClass() Return the underlying Java Class being managed, if available; otherwise null.
Object	getSource() Return the underlying source of the resolvable type.
ResolvableType	getSuperType() Return a ResolvableType representing the direct supertype of this type.
Type	getType() Return the underling Java Type being managed.
boolean	hasGenerics() Return true if this type contains generic parameters.
int	hashCode()
boolean	isArray() Return true if this type resolves to a Class that represents an array.
boolean	isAssignableFrom(Class<?> other) Determine whether this ResolvableType is assignable from the specified other type.
boolean	isAssignableFrom(ResolvableType other) Determine whether this ResolvableType is assignable from the specified other type.
Class<?>	resolve() Resolve this type to a Class, returning null if the type cannot be resolved.
Class<?>	resolve(Class<?> fallback) Resolve this type to a Class, returning the specified fallback if the type cannot be resolved.
Class<?>	resolveGeneric(int... indexes) Convenience method that will get and resolve a specific generic parameters.
Class<?>[]	resolveGenerics() Convenience method that will get and resolve generic parameters.
Class<?>[]	resolveGenerics(Class<?> fallback) Convenience method that will get and resolve generic parameters, using the specified fallback if any type cannot be resolved.
Class<?>	toClass() Return this type as a resolved Class, falling back to Object if no specific class can be resolved.
String	toString() Return a String representation of this type in its fully resolved form (including any generic parameters).

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料

NONE

public static final ResolvableType NONE

ResolvableType returned when no value is available. NONE is used in preference to null so that multiple method calls can be safely chained.

方法详细资料

getType

public Type getType()

Return the underling Java Type being managed.

getRawClass

public Class<?> getRawClass()

Return the underlying Java Class being managed, if available; otherwise null.

getSource

public Object getSource()

Return the underlying source of the resolvable type. Will return a Field, MethodParameter or Type depending on how the ResolvableType was constructed. With the exception of the NONE constant, this method will never return null. This method is primarily to provide access to additional type information or meta-data that alternative JVM languages may provide.

toClass

public Class<?> toClass()

Return this type as a resolved Class, falling back to Object if no specific class can be resolved.

返回:

the resolved Class or the Object fallback

从以下版本开始:

5.1

另请参阅:

getRawClass(), resolve(Class)

isAssignableFrom

public boolean isAssignableFrom(Class<?> other)

Determine whether this ResolvableType is assignable from the specified other type.

参数:

other - the type to be checked against (as a Class)

从以下版本开始:

4.2

另请参阅:

isAssignableFrom(ResolvableType)

isAssignableFrom

public boolean isAssignableFrom(ResolvableType other)

Determine whether this ResolvableType is assignable from the specified other type.

Attempts to follow the same rules as the Java compiler, considering whether both the resolved Class is assignable from the given type as well as whether all generics are assignable.

参数:

other - the type to be checked against (as a ResolvableType)

返回:

true if the specified other type can be assigned to this ResolvableType; false otherwise

isArray

public boolean isArray()

Return true if this type resolves to a Class that represents an array.

另请参阅:

getComponentType()

getComponentType

public ResolvableType getComponentType()

Return the ResolvableType representing the component type of the array or NONE if this type does not represent an array.

另请参阅:

isArray()

asCollection

public ResolvableType asCollection()

Convenience method to return this type as a resolvable Collection type. Returns NONE if this type does not implement or extend Collection.

另请参阅:

as(Class), asMap()

asMap

public ResolvableType asMap()

Convenience method to return this type as a resolvable Map type. Returns NONE if this type does not implement or extend Map.

另请参阅:

as(Class), asCollection()

as

public ResolvableType as(Class<?> type)

Return this type as a ResolvableType of the specified class. Searches supertype and interface hierarchies to find a match, returning NONE if this type does not implement or extend the specified class.

参数:

type - the required type (typically narrowed)

返回:

a ResolvableType representing this object as the specified type, or NONE if not resolvable as that type

另请参阅:

asCollection(), asMap(), getSuperType(), getInterfaces()

getSuperType

public ResolvableType getSuperType()

Return a ResolvableType representing the direct supertype of this type. If no supertype is available this method returns NONE.

Note: The resulting ResolvableType instance may not be Serializable.

另请参阅:

getInterfaces()

getInterfaces

public ResolvableType[] getInterfaces()

Return a ResolvableType array representing the direct interfaces implemented by this type. If this type does not implement any interfaces an empty array is returned.

Note: The resulting ResolvableType instances may not be Serializable.

另请参阅:

getSuperType()

hasGenerics

public boolean hasGenerics()

Return true if this type contains generic parameters.

另请参阅:

getGeneric(int...), getGenerics()

getNested

public ResolvableType getNested(int nestingLevel)

Return a ResolvableType for the specified nesting level. See getNested(int, Map) for details.

参数:

nestingLevel - the nesting level

返回:

the ResolvableType type, or #NONE

getNested

public ResolvableType getNested(int nestingLevel,
                                Map<Integer,Integer> typeIndexesPerLevel)

Return a ResolvableType for the specified nesting level.

The nesting level refers to the specific generic parameter that should be returned. A nesting level of 1 indicates this type; 2 indicates the first nested generic; 3 the second; and so on. For example, given List<Set<Integer>> level 1 refers to the List, level 2 the Set, and level 3 the Integer.

The typeIndexesPerLevel map can be used to reference a specific generic for the given level. For example, an index of 0 would refer to a Map key; whereas, 1 would refer to the value. If the map does not contain a value for a specific level the last generic will be used (e.g. a Map value).

Nesting levels may also apply to array types; for example given String[], a nesting level of 2 refers to String.

If a type does not contain generics the supertype hierarchy will be considered.

参数:

nestingLevel - the required nesting level, indexed from 1 for the current type, 2 for the first nested generic, 3 for the second and so on

typeIndexesPerLevel - a map containing the generic index for a given nesting level (may be null)

返回:

a ResolvableType for the nested level, or NONE

getGeneric

public ResolvableType getGeneric(int... indexes)

Return a ResolvableType representing the generic parameter for the given indexes. Indexes are zero based; for example given the type Map<Integer, List<String>>, getGeneric(0) will access the Integer. Nested generics can be accessed by specifying multiple indexes; for example getGeneric(1, 0) will access the String from the nested List. For convenience, if no indexes are specified the first generic is returned.

If no generic is available at the specified indexes NONE is returned.

参数:

indexes - the indexes that refer to the generic parameter (may be omitted to return the first generic)

返回:

a ResolvableType for the specified generic, or NONE

另请参阅:

hasGenerics(), getGenerics(), resolveGeneric(int...), resolveGenerics()

getGenerics

public ResolvableType[] getGenerics()

Return an array of ResolvableTypes representing the generic parameters of this type. If no generics are available an empty array is returned. If you need to access a specific generic consider using the getGeneric(int...) method as it allows access to nested generics and protects against IndexOutOfBoundsExceptions.

返回:

an array of ResolvableTypes representing the generic parameters (never null)

另请参阅:

hasGenerics(), getGeneric(int...), resolveGeneric(int...), resolveGenerics()

resolveGenerics

public Class<?>[] resolveGenerics()

Convenience method that will get and resolve generic parameters.

返回:

an array of resolved generic parameters (the resulting array will never be null, but it may contain null elements})

另请参阅:

getGenerics(), resolve()

resolveGenerics

public Class<?>[] resolveGenerics(Class<?> fallback)

Convenience method that will get and resolve generic parameters, using the specified fallback if any type cannot be resolved.

参数:

fallback - the fallback class to use if resolution fails

返回:

an array of resolved generic parameters

另请参阅:

getGenerics(), resolve()

resolveGeneric

public Class<?> resolveGeneric(int... indexes)

Convenience method that will get and resolve a specific generic parameters.

参数:

indexes - the indexes that refer to the generic parameter (may be omitted to return the first generic)

返回:

a resolved Class or null

另请参阅:

getGeneric(int...), resolve()

resolve

public Class<?> resolve()

Resolve this type to a Class, returning null if the type cannot be resolved. This method will consider bounds of TypeVariables and WildcardTypes if direct resolution fails; however, bounds of Object.class will be ignored.

If this method returns a non-null Class and hasGenerics() returns false, the given type effectively wraps a plain Class, allowing for plain Class processing if desirable.

返回:

the resolved Class, or null if not resolvable

另请参阅:

resolve(Class), resolveGeneric(int...), resolveGenerics()

resolve

public Class<?> resolve(Class<?> fallback)

Resolve this type to a Class, returning the specified fallback if the type cannot be resolved. This method will consider bounds of TypeVariables and WildcardTypes if direct resolution fails; however, bounds of Object.class will be ignored.

参数:

fallback - the fallback class to use if resolution fails

返回:

the resolved Class or the fallback

另请参阅:

resolve(), resolveGeneric(int...), resolveGenerics()

equals

public boolean equals(Object other)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

toString

public String toString()

Return a String representation of this type in its fully resolved form (including any generic parameters).

覆盖:

toString 在类中 Object

forClass

public static ResolvableType forClass(Class<?> clazz)

Return a ResolvableType for the specified Class, using the full generic type information for assignability checks. For example: ResolvableType.forClass(MyArrayList.class).

参数:

clazz - the class to introspect (null is semantically equivalent to Object.class for typical use cases here)

返回:

a ResolvableType for the specified class

另请参阅:

forClass(Class, Class), forClassWithGenerics(Class, Class...)

forRawClass

public static ResolvableType forRawClass(Class<?> clazz)

Return a ResolvableType for the specified Class, doing assignability checks against the raw class only (analogous to Class.isAssignableFrom(java.lang.Class<?>), which this serves as a wrapper for. For example: ResolvableType.forRawClass(List.class).

参数:

clazz - the class to introspect (null is semantically equivalent to Object.class for typical use cases here)

返回:

a ResolvableType for the specified class

从以下版本开始:

4.2

另请参阅:

forClass(Class), getRawClass()

forClass

public static ResolvableType forClass(Class<?> baseType,
                                      Class<?> implementationClass)

Return a ResolvableType for the specified base type (interface or base class) with a given implementation class. For example: ResolvableType.forClass(List.class, MyArrayList.class).

参数:

baseType - the base type (must not be null)

implementationClass - the implementation class

返回:

a ResolvableType for the specified base type backed by the given implementation class

另请参阅:

forClass(Class), forClassWithGenerics(Class, Class...)

forClassWithGenerics

public static ResolvableType forClassWithGenerics(Class<?> clazz,
                                                  Class<?>... generics)

Return a ResolvableType for the specified Class with pre-declared generics.

参数:

clazz - the class (or interface) to introspect

generics - the generics of the class

返回:

a ResolvableType for the specific class and generics

另请参阅:

forClassWithGenerics(Class, ResolvableType...)

forClassWithGenerics

public static ResolvableType forClassWithGenerics(Class<?> clazz,
                                                  ResolvableType... generics)

Return a ResolvableType for the specified Class with pre-declared generics.

参数:

clazz - the class (or interface) to introspect

generics - the generics of the class

返回:

a ResolvableType for the specific class and generics

另请参阅:

forClassWithGenerics(Class, Class...)

forField

public static ResolvableType forField(Field field)

Return a ResolvableType for the specified Field.

参数:

field - the source field

返回:

a ResolvableType for the specified field

另请参阅:

forField(Field, Class)

forField

public static ResolvableType forField(Field field,
                                      Class<?> implementationClass)

Return a ResolvableType for the specified Field with a given implementation.

Use this variant when the class that declares the field includes generic parameter variables that are satisfied by the implementation class.

参数:

field - the source field

implementationClass - the implementation class

返回:

a ResolvableType for the specified field

另请参阅:

forField(Field)

forField

public static ResolvableType forField(Field field,
                                      ResolvableType implementationType)

Return a ResolvableType for the specified Field with a given implementation.

Use this variant when the class that declares the field includes generic parameter variables that are satisfied by the implementation type.

参数:

field - the source field

implementationType - the implementation type

返回:

a ResolvableType for the specified field

另请参阅:

forField(Field)

forField

public static ResolvableType forField(Field field,
                                      int nestingLevel)

Return a ResolvableType for the specified Field with the given nesting level.

参数:

field - the source field

nestingLevel - the nesting level (1 for the outer level; 2 for a nested generic type; etc)

另请参阅:

forField(Field)

forField

public static ResolvableType forField(Field field,
                                      int nestingLevel,
                                      Class<?> implementationClass)

Return a ResolvableType for the specified Field with a given implementation and the given nesting level.

Use this variant when the class that declares the field includes generic parameter variables that are satisfied by the implementation class.

参数:

field - the source field

nestingLevel - the nesting level (1 for the outer level; 2 for a nested generic type; etc)

implementationClass - the implementation class

返回:

a ResolvableType for the specified field

另请参阅:

forField(Field)

forConstructorParameter

public static ResolvableType forConstructorParameter(Constructor<?> constructor,
                                                     int parameterIndex)

Return a ResolvableType for the specified Constructor parameter.

参数:

constructor - the source constructor (must not be null)

parameterIndex - the parameter index

返回:

a ResolvableType for the specified constructor parameter

另请参阅:

forConstructorParameter(Constructor, int, Class)

forConstructorParameter

public static ResolvableType forConstructorParameter(Constructor<?> constructor,
                                                     int parameterIndex,
                                                     Class<?> implementationClass)

Return a ResolvableType for the specified Constructor parameter with a given implementation. Use this variant when the class that declares the constructor includes generic parameter variables that are satisfied by the implementation class.

参数:

constructor - the source constructor (must not be null)

parameterIndex - the parameter index

implementationClass - the implementation class

返回:

a ResolvableType for the specified constructor parameter

另请参阅:

forConstructorParameter(Constructor, int)

forMethodReturnType

public static ResolvableType forMethodReturnType(Method method)

Return a ResolvableType for the specified Method return type.

参数:

method - the source for the method return type

返回:

a ResolvableType for the specified method return

另请参阅:

forMethodReturnType(Method, Class)

forMethodReturnType

public static ResolvableType forMethodReturnType(Method method,
                                                 Class<?> implementationClass)

Return a ResolvableType for the specified Method return type. Use this variant when the class that declares the method includes generic parameter variables that are satisfied by the implementation class.

参数:

method - the source for the method return type

implementationClass - the implementation class

返回:

a ResolvableType for the specified method return

另请参阅:

forMethodReturnType(Method)

forMethodParameter

public static ResolvableType forMethodParameter(Method method,
                                                int parameterIndex)

Return a ResolvableType for the specified Method parameter.

参数:

method - the source method (must not be null)

parameterIndex - the parameter index

返回:

a ResolvableType for the specified method parameter

另请参阅:

forMethodParameter(Method, int, Class), forMethodParameter(MethodParameter)

forMethodParameter

public static ResolvableType forMethodParameter(Method method,
                                                int parameterIndex,
                                                Class<?> implementationClass)

Return a ResolvableType for the specified Method parameter with a given implementation. Use this variant when the class that declares the method includes generic parameter variables that are satisfied by the implementation class.

参数:

method - the source method (must not be null)

parameterIndex - the parameter index

implementationClass - the implementation class

返回:

a ResolvableType for the specified method parameter

另请参阅:

forMethodParameter(Method, int, Class), forMethodParameter(MethodParameter)

forMethodParameter

public static ResolvableType forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter)

Return a ResolvableType for the specified MethodParameter.

参数:

methodParameter - the source method parameter (must not be null)

返回:

a ResolvableType for the specified method parameter

另请参阅:

forMethodParameter(Method, int)

forMethodParameter

public static ResolvableType forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter,
                                                ResolvableType implementationType)

Return a ResolvableType for the specified MethodParameter with a given implementation type. Use this variant when the class that declares the method includes generic parameter variables that are satisfied by the implementation type.

参数:

methodParameter - the source method parameter (must not be null)

implementationType - the implementation type

返回:

a ResolvableType for the specified method parameter

另请参阅:

forMethodParameter(MethodParameter)

forMethodParameter

public static ResolvableType forMethodParameter(net.hasor.cobble.reflect.resolvable.MethodParameter methodParameter,
                                                Type targetType)

Return a ResolvableType for the specified MethodParameter, overriding the target type to resolve with a specific given type.

参数:

methodParameter - the source method parameter (must not be null)

targetType - the type to resolve (a part of the method parameter's type)

返回:

a ResolvableType for the specified method parameter

另请参阅:

forMethodParameter(Method, int)

forArrayComponent

public static ResolvableType forArrayComponent(ResolvableType componentType)

Return a ResolvableType as a array of the specified componentType.

参数:

componentType - the component type

返回:

a ResolvableType as an array of the specified component type

forType

public static ResolvableType forType(Type type)

Return a ResolvableType for the specified Type.

Note: The resulting ResolvableType instance may not be Serializable.

参数:

type - the source type (potentially null)

返回:

a ResolvableType for the specified Type

另请参阅:

forType(Type, ResolvableType)

forType

public static ResolvableType forType(Type type,
                                     ResolvableType owner)

Return a ResolvableType for the specified Type backed by the given owner type.

Note: The resulting ResolvableType instance may not be Serializable.

参数:

type - the source type or null

owner - the owner type used to resolve variables

返回:

a ResolvableType for the specified Type and owner

另请参阅:

forType(Type)

clearCache

public static void clearCache()

Clear the internal ResolvableType/SerializableTypeWrapper cache.

从以下版本开始:

4.2