ClassDefinitionUtils (Objenesis 2.5.1 API)

java.lang.Object
- org.objenesis.instantiator.basic.ClassDefinitionUtils

```
public final class ClassDefinitionUtils
extends Object
```
Helper class for ProxyObjectInstantiator. We can see the details of a class specification here

Author:

Henri Tremblay

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`ACC_ABSTRACT`
`static int`	`ACC_ANNOTATION`
`static int`	`ACC_ENUM`
`static int`	`ACC_FINAL`
`static int`	`ACC_INTERFACE`
`static int`	`ACC_PUBLIC`
`static int`	`ACC_SUPER`
`static int`	`ACC_SYNTHETIC`
`static int`	`CONSTANT_Class`
`static int`	`CONSTANT_Double`
`static int`	`CONSTANT_Fieldref`
`static int`	`CONSTANT_Float`
`static int`	`CONSTANT_Integer`
`static int`	`CONSTANT_InterfaceMethodref`
`static int`	`CONSTANT_InvokeDynamic`
`static int`	`CONSTANT_Long`
`static int`	`CONSTANT_MethodHandle`
`static int`	`CONSTANT_Methodref`
`static int`	`CONSTANT_MethodType`
`static int`	`CONSTANT_NameAndType`
`static int`	`CONSTANT_String`
`static int`	`CONSTANT_Utf8`
`static byte[]`	`MAGIC`
`static byte`	`OPS_aload_0`
`static byte`	`OPS_areturn`
`static byte`	`OPS_dup`
`static byte`	`OPS_invokespecial`
`static byte`	`OPS_new`
`static byte`	`OPS_return`
`static byte[]`	`VERSION`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String`	`classNameToInternalClassName(String className)` Will convert a class name to its name in the class definition format (e.g `org.objenesis.EmptyClass` becomes `org/objenesis/EmptyClass`)
`static String`	`classNameToResource(String className)` Will convert a class name to its class loader resource name (e.g `org.objenesis.EmptyClass` becomes `org/objenesis/EmptyClass.class`)
`static <T> Class<T>`	`defineClass(String className, byte[] b, ClassLoader loader)` Define a class in the provided class loader from the array of bytes.
`static <T> Class<T>`	`getExistingClass(ClassLoader classLoader, String className)` Check if this class already exists in the class loader and return it if it does
`static byte[]`	`readClass(String className)` Read the bytes of a class from the classpath
`static void`	`writeClass(String fileName, byte[] bytes)` Write all class bytes to a file.

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

- Field Detail
  - OPS_aload_0
```
public static final byte OPS_aload_0
```
    See Also:
    
    Constant Field Values
  - OPS_invokespecial
```
public static final byte OPS_invokespecial
```
    See Also:
    
    Constant Field Values
  - OPS_return
```
public static final byte OPS_return
```
    See Also:
    
    Constant Field Values
  - OPS_new
```
public static final byte OPS_new
```
    See Also:
    
    Constant Field Values
  - OPS_dup
```
public static final byte OPS_dup
```
    See Also:
    
    Constant Field Values
  - OPS_areturn
```
public static final byte OPS_areturn
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Utf8
```
public static final int CONSTANT_Utf8
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Integer
```
public static final int CONSTANT_Integer
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Float
```
public static final int CONSTANT_Float
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Long
```
public static final int CONSTANT_Long
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Double
```
public static final int CONSTANT_Double
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Class
```
public static final int CONSTANT_Class
```
    See Also:
    
    Constant Field Values
  - CONSTANT_String
```
public static final int CONSTANT_String
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Fieldref
```
public static final int CONSTANT_Fieldref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Methodref
```
public static final int CONSTANT_Methodref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_InterfaceMethodref
```
public static final int CONSTANT_InterfaceMethodref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_NameAndType
```
public static final int CONSTANT_NameAndType
```
    See Also:
    
    Constant Field Values
  - CONSTANT_MethodHandle
```
public static final int CONSTANT_MethodHandle
```
    See Also:
    
    Constant Field Values
  - CONSTANT_MethodType
```
public static final int CONSTANT_MethodType
```
    See Also:
    
    Constant Field Values
  - CONSTANT_InvokeDynamic
```
public static final int CONSTANT_InvokeDynamic
```
    See Also:
    
    Constant Field Values
  - ACC_PUBLIC
```
public static final int ACC_PUBLIC
```
    See Also:
    
    Constant Field Values
  - ACC_FINAL
```
public static final int ACC_FINAL
```
    See Also:
    
    Constant Field Values
  - ACC_SUPER
```
public static final int ACC_SUPER
```
    See Also:
    
    Constant Field Values
  - ACC_INTERFACE
```
public static final int ACC_INTERFACE
```
    See Also:
    
    Constant Field Values
  - ACC_ABSTRACT
```
public static final int ACC_ABSTRACT
```
    See Also:
    
    Constant Field Values
  - ACC_SYNTHETIC
```
public static final int ACC_SYNTHETIC
```
    See Also:
    
    Constant Field Values
  - ACC_ANNOTATION
```
public static final int ACC_ANNOTATION
```
    See Also:
    
    Constant Field Values
  - ACC_ENUM
```
public static final int ACC_ENUM
```
    See Also:
    
    Constant Field Values
  - MAGIC
```
public static final byte[] MAGIC
```
  - VERSION
```
public static final byte[] VERSION
```
- Method Detail
  - defineClass
```
public static <T> Class<T> defineClass(String className,
                                       byte[] b,
                                       ClassLoader loader)
                                throws Exception
```
    Define a class in the provided class loader from the array of bytes. Inspired by cglib ReflectUtils.defineClass
    
    Type Parameters:
    
    T - type of the class returned
    
    Parameters:
    
    className - class name in the format org.objenesis.MyClass
    
    b - bytes representing the class
    
    loader - the class loader where the class will be loaded
    
    Returns:
    
    the newly loaded class
    
    Throws:
    
    Exception - whenever something goes wrong
  - readClass
```
public static byte[] readClass(String className)
                        throws IOException
```
    Read the bytes of a class from the classpath
    
    Parameters:
    
    className - full class name including the package
    
    Returns:
    
    the bytes representing the class
    
    Throws:
    
    IllegalArgumentException - if the class is longer than 2500 bytes
    
    IOException - if we fail to read the class
  - writeClass
```
public static void writeClass(String fileName,
                              byte[] bytes)
                       throws IOException
```
    Write all class bytes to a file.
    
    Parameters:
    
    fileName - file where the bytes will be written
    
    bytes - bytes representing the class
    
    Throws:
    
    IOException - if we fail to write the class
  - classNameToInternalClassName
```
public static String classNameToInternalClassName(String className)
```
    Will convert a class name to its name in the class definition format (e.g org.objenesis.EmptyClass becomes org/objenesis/EmptyClass)
    
    Parameters:
    
    className - full class name including the package
    
    Returns:
    
    the internal name
  - classNameToResource
```
public static String classNameToResource(String className)
```
    Will convert a class name to its class loader resource name (e.g org.objenesis.EmptyClass becomes org/objenesis/EmptyClass.class)
    
    Parameters:
    
    className - full class name including the package
    
    Returns:
    
    the resource name
  - getExistingClass
```
public static <T> Class<T> getExistingClass(ClassLoader classLoader,
                                            String className)
```
    Check if this class already exists in the class loader and return it if it does
    
    Type Parameters:
    
    T - type of the class returned
    
    Parameters:
    
    classLoader - Class loader where to search the class
    
    className - Class name with full path
    
    Returns:
    
    the class if it already exists or null

Class ClassDefinitionUtils

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

OPS_aload_0

OPS_invokespecial

OPS_return

OPS_new

OPS_dup

OPS_areturn

CONSTANT_Utf8

CONSTANT_Integer

CONSTANT_Float

CONSTANT_Long

CONSTANT_Double

CONSTANT_Class

CONSTANT_String

CONSTANT_Fieldref

CONSTANT_Methodref

CONSTANT_InterfaceMethodref

CONSTANT_NameAndType

CONSTANT_MethodHandle

CONSTANT_MethodType

CONSTANT_InvokeDynamic

ACC_PUBLIC

ACC_FINAL

ACC_SUPER

ACC_INTERFACE

ACC_ABSTRACT

ACC_SYNTHETIC

ACC_ANNOTATION

ACC_ENUM

MAGIC

VERSION

Method Detail

defineClass

readClass

writeClass

classNameToInternalClassName

classNameToResource

getExistingClass