Java Module jdk.dynalink Package jdk.dynalink.linker.support Class Lookup（JDK11）

162 阅读 0 评论 0 点赞

java.lang.Object
- jdk.dynalink.linker.support.Lookup

```
public final class Lookup
extends Object
```
A wrapper around MethodHandles.Lookup that masks checked exceptions. It is useful in those cases when you're looking up methods within your own codebase (therefore it is an error if they are not present).

Field Summary
Fields
Modifier and Type Field Description
static Lookup PUBLIC
A canonical Lookup object that wraps MethodHandles.publicLookup().

Constructor Summary
Constructors
Constructor Description
Lookup(MethodHandles.Lookup lookup)
Creates a new instance, bound to an instance of MethodHandles.Lookup.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`MethodHandle`	`findGetter(Class<?> refc, String name, Class<?> type)`	Performs a `MethodHandles.Lookup.findGetter(Class, String, Class)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError` and `NoSuchFieldException` into a `NoSuchFieldError`.
`static MethodHandle`	`findOwnSpecial(MethodHandles.Lookup lookup, String name, Class<?> rtype, Class<?>... ptypes)`	Given a lookup, finds using `findSpecial(Class, String, MethodType)` a method on that lookup's class.
`MethodHandle`	`findOwnSpecial(String name, Class<?> rtype, Class<?>... ptypes)`	Finds using `findSpecial(Class, String, MethodType)` a method on that lookup's class.
`static MethodHandle`	`findOwnStatic(MethodHandles.Lookup lookup, String name, Class<?> rtype, Class<?>... ptypes)`	Given a lookup, finds using `findStatic(Class, String, MethodType)` a method on that lookup's class.
`MethodHandle`	`findOwnStatic(String name, Class<?> rtype, Class<?>... ptypes)`	Finds using `findStatic(Class, String, MethodType)` a method on that lookup's class.
`MethodHandle`	`findSpecial(Class<?> declaringClass, String name, MethodType type)`	Performs a `MethodHandles.Lookup.findSpecial(Class, String, MethodType, Class)` on the underlying lookup.
`MethodHandle`	`findStatic(Class<?> declaringClass, String name, MethodType type)`	Performs a `MethodHandles.Lookup.findStatic(Class, String, MethodType)` on the underlying lookup.
`MethodHandle`	`findVirtual(Class<?> declaringClass, String name, MethodType type)`	Performs a `MethodHandles.Lookup.findVirtual(Class, String, MethodType)` on the underlying lookup.
`static MethodHandle`	`unreflect(MethodHandles.Lookup lookup, Method m)`	Performs a `MethodHandles.Lookup.unreflect(Method)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.
`MethodHandle`	`unreflect(Method m)`	Performs a `MethodHandles.Lookup.unreflect(Method)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.
`static MethodHandle`	`unreflectConstructor(MethodHandles.Lookup lookup, Constructor<?> c)`	Performs a `MethodHandles.Lookup.unreflectConstructor(Constructor)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.
`MethodHandle`	`unreflectConstructor(Constructor<?> c)`	Performs a `MethodHandles.Lookup.unreflectConstructor(Constructor)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.
`MethodHandle`	`unreflectGetter(Field f)`	Performs a `MethodHandles.Lookup.unreflectGetter(Field)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.
`MethodHandle`	`unreflectSetter(Field f)`	Performs a `MethodHandles.Lookup.unreflectSetter(Field)`, converting any encountered `IllegalAccessException` into an `IllegalAccessError`.

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PUBLIC
```
public static final Lookup PUBLIC
```
    A canonical Lookup object that wraps MethodHandles.publicLookup().
- Constructor Detail
  - Lookup
```
public Lookup(MethodHandles.Lookup lookup)
```
    Creates a new instance, bound to an instance of MethodHandles.Lookup.
    Parameters:
    lookup - the MethodHandles.Lookup it delegates to.
- Method Detail
  - unreflect
```
public MethodHandle unreflect(Method m)
```
    Performs a MethodHandles.Lookup.unreflect(Method), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    m - the method to unreflect
    Returns:
    the unreflected method handle.
    Throws:
    IllegalAccessError - if the method is inaccessible.
  - unreflect
```
public static MethodHandle unreflect(MethodHandles.Lookup lookup,
                                     Method m)
```
    Performs a MethodHandles.Lookup.unreflect(Method), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    lookup - the lookup used to unreflect
    m - the method to unreflect
    Returns:
    the unreflected method handle.
    Throws:
    IllegalAccessError - if the method is inaccessible.
  - unreflectGetter
```
public MethodHandle unreflectGetter(Field f)
```
    Performs a MethodHandles.Lookup.unreflectGetter(Field), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    f - the field for which a getter is unreflected
    Returns:
    the unreflected field getter handle.
    Throws:
    IllegalAccessError - if the getter is inaccessible.
  - findGetter
```
public MethodHandle findGetter(Class<?> refc,
                               String name,
                               Class<?> type)
```
    Performs a MethodHandles.Lookup.findGetter(Class, String, Class), converting any encountered IllegalAccessException into an IllegalAccessError and NoSuchFieldException into a NoSuchFieldError.
    Parameters:
    refc - the class declaring the field
    name - the name of the field
    type - the type of the field
    Returns:
    the unreflected field getter handle.
    Throws:
    IllegalAccessError - if the field is inaccessible.
    NoSuchFieldError - if the field does not exist.
  - unreflectSetter
```
public MethodHandle unreflectSetter(Field f)
```
    Performs a MethodHandles.Lookup.unreflectSetter(Field), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    f - the field for which a setter is unreflected
    Returns:
    the unreflected field setter handle.
    Throws:
    IllegalAccessError - if the field is inaccessible.
    NoSuchFieldError - if the field does not exist.
  - unreflectConstructor
```
public MethodHandle unreflectConstructor(Constructor<?> c)
```
    Performs a MethodHandles.Lookup.unreflectConstructor(Constructor), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    c - the constructor to unreflect
    Returns:
    the unreflected constructor handle.
    Throws:
    IllegalAccessError - if the constructor is inaccessible.
  - unreflectConstructor
```
public static MethodHandle unreflectConstructor(MethodHandles.Lookup lookup,
                                                Constructor<?> c)
```
    Performs a MethodHandles.Lookup.unreflectConstructor(Constructor), converting any encountered IllegalAccessException into an IllegalAccessError.
    Parameters:
    lookup - the lookup used to unreflect
    c - the constructor to unreflect
    Returns:
    the unreflected constructor handle.
    Throws:
    IllegalAccessError - if the constructor is inaccessible.
  - findSpecial
```
public MethodHandle findSpecial(Class<?> declaringClass,
                                String name,
                                MethodType type)
```
    Performs a MethodHandles.Lookup.findSpecial(Class, String, MethodType, Class) on the underlying lookup. Converts any encountered IllegalAccessException into an IllegalAccessError and NoSuchMethodException into a NoSuchMethodError.
    Parameters:
    declaringClass - class declaring the method
    name - the name of the method
    type - the type of the method
    Returns:
    a method handle for the method
    Throws:
    IllegalAccessError - if the method is inaccessible.
    NoSuchMethodError - if the method does not exist.
  - findStatic
```
public MethodHandle findStatic(Class<?> declaringClass,
                               String name,
                               MethodType type)
```
    Performs a MethodHandles.Lookup.findStatic(Class, String, MethodType) on the underlying lookup. Converts any encountered IllegalAccessException into an IllegalAccessError and NoSuchMethodException into a NoSuchMethodError.
    Parameters:
    declaringClass - class declaring the method
    name - the name of the method
    type - the type of the method
    Returns:
    a method handle for the method
    Throws:
    IllegalAccessError - if the method is inaccessible.
    NoSuchMethodError - if the method does not exist.
  - findVirtual
```
public MethodHandle findVirtual(Class<?> declaringClass,
                                String name,
                                MethodType type)
```
    Performs a MethodHandles.Lookup.findVirtual(Class, String, MethodType) on the underlying lookup. Converts any encountered IllegalAccessException into an IllegalAccessError and NoSuchMethodException into a NoSuchMethodError.
    Parameters:
    declaringClass - class declaring the method
    name - the name of the method
    type - the type of the method
    Returns:
    a method handle for the method
    Throws:
    IllegalAccessError - if the method is inaccessible.
    NoSuchMethodError - if the method does not exist.
  - findOwnSpecial
```
public static MethodHandle findOwnSpecial(MethodHandles.Lookup lookup,
                                          String name,
                                          Class<?> rtype,
                                          Class<?>... ptypes)
```
    Given a lookup, finds using findSpecial(Class, String, MethodType) a method on that lookup's class. Useful in classes' code for convenient linking to their own privates.
    Parameters:
    lookup - the lookup for the class
    name - the name of the method
    rtype - the return type of the method
    ptypes - the parameter types of the method
    Returns:
    the method handle for the method
  - findOwnSpecial
```
public MethodHandle findOwnSpecial(String name,
                                   Class<?> rtype,
                                   Class<?>... ptypes)
```
    Finds using findSpecial(Class, String, MethodType) a method on that lookup's class. Useful in classes' code for convenient linking to their own privates. It's also more convenient than findSpecial in that you can just list the parameter types, and don't have to specify lookup class.
    Parameters:
    name - the name of the method
    rtype - the return type of the method
    ptypes - the parameter types of the method
    Returns:
    the method handle for the method
  - findOwnStatic
```
public static MethodHandle findOwnStatic(MethodHandles.Lookup lookup,
                                         String name,
                                         Class<?> rtype,
                                         Class<?>... ptypes)
```
    Given a lookup, finds using findStatic(Class, String, MethodType) a method on that lookup's class. Useful in classes' code for convenient linking to their own privates. It's easier to use than findStatic in that you can just list the parameter types, and don't have to specify lookup class.
    Parameters:
    lookup - the lookup for the class
    name - the name of the method
    rtype - the return type of the method
    ptypes - the parameter types of the method
    Returns:
    the method handle for the method
  - findOwnStatic
```
public MethodHandle findOwnStatic(String name,
                                  Class<?> rtype,
                                  Class<?>... ptypes)
```
    Finds using findStatic(Class, String, MethodType) a method on that lookup's class. Useful in classes' code for convenient linking to their own privates. It's easier to use than findStatic in that you can just list the parameter types, and don't have to specify lookup class.
    Parameters:
    name - the name of the method
    rtype - the return type of the method
    ptypes - the parameter types of the method
    Returns:
    the method handle for the method

本文分类：JavaAPI
本文标签：JavaAPI JDK11 Java11
浏览次数：162 次浏览
本文链接：/javaapi/39379.html

Java Module jdk.dynalink Package jdk.dynalink.linker.support Class Lookup（JDK11）

Class Lookup

Field Summary

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Field Detail

PUBLIC

Constructor Detail

Lookup

Method Detail

unreflect

unreflect

unreflectGetter

findGetter

unreflectSetter

unreflectConstructor

unreflectConstructor

findSpecial

findStatic

findVirtual

findOwnSpecial

findOwnSpecial

findOwnStatic

findOwnStatic