Package javassist.tools.reflect
Class Reflection
- java.lang.Object
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- javassist.tools.reflect.Reflection
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- All Implemented Interfaces:
Translator
public class Reflection extends java.lang.Object implements Translator
The class implementing the behavioral reflection mechanism.If a class is reflective, then all the method invocations on every instance of that class are intercepted by the runtime metaobject controlling that instance. The methods inherited from the super classes are also intercepted except final methods. To intercept a final method in a super class, that super class must be also reflective.
To do this, the original class file representing a reflective class:
class Person { public int f(int i) { return i + 1; } public int value; }
is modified so that it represents a class:
class Person implements Metalevel { public int _original_f(int i) { return i + 1; } public int f(int i) { delegate to the metaobject } public int value; public int _r_value() { read "value" } public void _w_value(int v) { write "value" } public ClassMetaobject _getClass() { return a class metaobject } public Metaobject _getMetaobject() { return a metaobject } public void _setMetaobject(Metaobject m) { change a metaobject } }
- See Also:
ClassMetaobject
,Metaobject
,Loader
,Compiler
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Constructor Summary
Constructors Constructor Description Reflection()
Constructs a newReflection
object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
makeReflective(java.lang.Class<?> clazz, java.lang.Class<?> metaobject, java.lang.Class<?> metaclass)
Produces a reflective class.boolean
makeReflective(java.lang.String classname, java.lang.String metaobject, java.lang.String metaclass)
Produces a reflective class.boolean
makeReflective(CtClass clazz, CtClass metaobject, CtClass metaclass)
Produces a reflective class.void
onLoad(ClassPool pool, java.lang.String classname)
Inserts hooks for intercepting accesses to the fields declared in reflective classes.void
rebuildClassFile(ClassFile cf)
void
start(ClassPool pool)
Initializes the object.
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Method Detail
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start
public void start(ClassPool pool) throws NotFoundException
Initializes the object.- Specified by:
start
in interfaceTranslator
- Parameters:
pool
- theClassPool
that this translator should use.- Throws:
NotFoundException
- if aCtClass
cannot be found.- See Also:
Loader
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onLoad
public void onLoad(ClassPool pool, java.lang.String classname) throws CannotCompileException, NotFoundException
Inserts hooks for intercepting accesses to the fields declared in reflective classes.- Specified by:
onLoad
in interfaceTranslator
- Parameters:
pool
- theClassPool
that this translator should use.classname
- the name of the class being loaded.- Throws:
CannotCompileException
- if the code transformation by this method fails.NotFoundException
- if aCtClass
cannot be found.- See Also:
Loader
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makeReflective
public boolean makeReflective(java.lang.String classname, java.lang.String metaobject, java.lang.String metaclass) throws CannotCompileException, NotFoundException
Produces a reflective class. If the super class is also made reflective, it must be done before the sub class.- Parameters:
classname
- the name of the reflective classmetaobject
- the class name of metaobjects.metaclass
- the class name of the class metaobject.- Returns:
false
if the class is already reflective.- Throws:
CannotCompileException
NotFoundException
- See Also:
Metaobject
,ClassMetaobject
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makeReflective
public boolean makeReflective(java.lang.Class<?> clazz, java.lang.Class<?> metaobject, java.lang.Class<?> metaclass) throws CannotCompileException, NotFoundException
Produces a reflective class. If the super class is also made reflective, it must be done before the sub class.- Parameters:
clazz
- the reflective class.metaobject
- the class of metaobjects. It must be a subclass ofMetaobject
.metaclass
- the class of the class metaobject. It must be a subclass ofClassMetaobject
.- Returns:
false
if the class is already reflective.- Throws:
CannotCompileException
NotFoundException
- See Also:
Metaobject
,ClassMetaobject
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makeReflective
public boolean makeReflective(CtClass clazz, CtClass metaobject, CtClass metaclass) throws CannotCompileException, CannotReflectException, NotFoundException
Produces a reflective class. It modifies the givenCtClass
object and makes it reflective. If the super class is also made reflective, it must be done before the sub class.- Parameters:
clazz
- the reflective class.metaobject
- the class of metaobjects. It must be a subclass ofMetaobject
.metaclass
- the class of the class metaobject. It must be a subclass ofClassMetaobject
.- Returns:
false
if the class is already reflective.- Throws:
CannotCompileException
CannotReflectException
NotFoundException
- See Also:
Metaobject
,ClassMetaobject
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rebuildClassFile
public void rebuildClassFile(ClassFile cf) throws BadBytecode
- Throws:
BadBytecode
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