API for clojure.reflect - Clojure v1.5 (stable)

by Stuart Halloway

Full namespace name: clojure.reflect

Overview

Reflection on Host Types
Alpha - subject to change.

Two main entry points: 

* type-reflect reflects on something that implements TypeReference.
* reflect (for REPL use) reflects on the class of an instance, or
  on a class if passed a class

Key features:

* Exposes the read side of reflection as pure data. Reflecting
  on a type returns a map with keys :bases, :flags, and :members.

* Canonicalizes class names as Clojure symbols. Types can extend
  to the TypeReference protocol to indicate that they can be
  unambiguously resolved as a type name. The canonical format
  requires one non-Java-ish convention: array brackets are <>
  instead of [] so they can be part of a Clojure symbol.

* Pluggable Reflectors for different implementations. The default
  JavaReflector is good when you have a class in hand, or use
  the AsmReflector for "hands off" reflection without forcing
  classes to load.

Platform implementers must:

* Create an implementation of Reflector.
* Create one or more implementations of TypeReference.
* def default-reflector to be an instance that satisfies Reflector.
Added in Clojure version 1.3

Protocols



ClassResolver

Protocol

    Known implementations: clojure.lang.Fn, java.lang.ClassLoader
    

resolve-class

function
Usage: (resolve-class this name)
Given a class name, return that typeref's class bytes as an InputStream.
Source


Reflector

Protocol
Protocol for reflection implementers.
Known implementations: AsmReflector, JavaReflector

do-reflect

function
Usage: (do-reflect reflector typeref)

      
      
      
    
Source


TypeReference

Protocol
A TypeReference can be unambiguously converted to a type name on
the host platform.

All typerefs are normalized into symbols. If you need to
normalize a typeref yourself, call typesym.
Known implementations: clojure.asm.Type, clojure.lang.Symbol, java.lang.Class

typename

function
Usage: (typename o)
Returns Java name as returned by ASM getClassName, e.g. byte[], java.lang.String[]
Source

Types



AsmReflector

type

    Fields: [class-resolver]
Protocols: Reflector
Interfaces:


Constructor

record

    Fields: [name declaring-class parameter-types exception-types flags]
Protocols:
Interfaces: clojure.lang.IHashEq, clojure.lang.IKeywordLookup, clojure.lang.ILookup, clojure.lang.IObj, clojure.lang.IPersistentMap, java.io.Serializable, java.util.Map


Field

record

    Fields: [name type declaring-class flags]
Protocols:
Interfaces: clojure.lang.IHashEq, clojure.lang.IKeywordLookup, clojure.lang.ILookup, clojure.lang.IObj, clojure.lang.IPersistentMap, java.io.Serializable, java.util.Map


JavaReflector

type

    Fields: [classloader]
Protocols: Reflector
Interfaces:


Method

record

    Fields: [name return-type declaring-class parameter-types exception-types flags]
Protocols:
Interfaces: clojure.lang.IHashEq, clojure.lang.IKeywordLookup, clojure.lang.ILookup, clojure.lang.IObj, clojure.lang.IPersistentMap, java.io.Serializable, java.util.Map

Public Variables and Functions



->AsmReflector

function
Usage: (->AsmReflector class-resolver)
Positional factory function for class clojure.reflect.AsmReflector.
Source


->Constructor

function
Usage: (->Constructor name declaring-class parameter-types exception-types flags)
Positional factory function for class clojure.reflect.Constructor.
Source


->Field

function
Usage: (->Field name type declaring-class flags)
Positional factory function for class clojure.reflect.Field.
Source


->JavaReflector

function
Usage: (->JavaReflector classloader)
Positional factory function for class clojure.reflect.JavaReflector.
Source


->Method

function
Usage: (->Method name return-type declaring-class parameter-types exception-types flags)
Positional factory function for class clojure.reflect.Method.
Source


flag-descriptors

var

    
The Java access bitflags, along with their friendly names and
the kinds of objects to which they can apply.
Source


map->Constructor

function
Usage: (map->Constructor m#)
Factory function for class clojure.reflect.Constructor, taking a map of keywords to field values.
Source


map->Field

function
Usage: (map->Field m#)
Factory function for class clojure.reflect.Field, taking a map of keywords to field values.
Source


map->Method

function
Usage: (map->Method m#)
Factory function for class clojure.reflect.Method, taking a map of keywords to field values.
Source


reflect

function
Usage: (reflect obj & options)
Alpha - subject to change.
Reflect on the type of obj (or obj itself if obj is a class).
Return value and options are the same as for type-reflect. 
Added in Clojure version 1.3
Source


type-reflect

function
Usage: (type-reflect typeref & options)
Alpha - subject to change.
 Reflect on a typeref, returning a map with :bases, :flags, and
:members. In the discussion below, names are always Clojure symbols.

 :bases            a set of names of the type's bases
 :flags            a set of keywords naming the boolean attributes
                   of the type.
 :members          a set of the type's members. Each membrer is a map
                   and can be a constructor, method, or field.

 Keys common to all members:
 :name             name of the type 
 :declaring-class  name of the declarer
 :flags            keyword naming boolean attributes of the member

 Keys specific to constructors:
 :parameter-types  vector of parameter type names
 :exception-types  vector of exception type names

 Key specific to methods:
 :parameter-types  vector of parameter type names
 :exception-types  vector of exception type names
 :return-type      return type name

 Keys specific to fields:
 :type             type name

 Options:

   :ancestors     in addition to the keys described above, also
                  include an :ancestors key with the entire set of
                  ancestors, and add all ancestor members to
                  :members.
   :reflector     implementation to use. Defaults to JavaReflector,
                  AsmReflector is also an option.
Added in Clojure version 1.3
Source
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