com.dkfqs.tools.lib

Class ByteArrayClassLoader

java.lang.Object

java.lang.ClassLoader

com.dkfqs.tools.lib.ByteArrayClassLoader

public class ByteArrayClassLoader
extends java.lang.ClassLoader

A class loader that dynamically converts byte arrays to java classes at runtime. However, new classes with duplicated class names but different class content (bytes) cannot be (re-)loaded.

Constructor Summary

Constructors

Constructor and Description
ByteArrayClassLoader(java.lang.ClassLoader parent) Create a new instance of this class loader.

Method Summary

Modifier and Type	Method and Description
java.lang.Class	defineClass(byte[] classData) Define a class from a byte array.
java.lang.Class	defineClass(byte[] classData, java.lang.String hashStr) Define a class from a byte array.
java.lang.Class	getDefinedClass(java.lang.String hashStr) Get an already defined class, addressed by the hash string of the class data.

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ByteArrayClassLoader

public ByteArrayClassLoader(java.lang.ClassLoader parent)

Create a new instance of this class loader.

Parameters:

parent - the parent class loader used for delegation

Method Detail

defineClass

public java.lang.Class defineClass(byte[] classData)

Define a class from a byte array. Note that this method uses a cache which prevents to define the same class multiple times.

Parameters:

classData - the binary class data

Returns:

the defined class

Throws:

java.lang.LinkageError - if a class with the same name is already defined

defineClass

public java.lang.Class defineClass(byte[] classData,
                                   java.lang.String hashStr)

Define a class from a byte array. Note that this method uses a cache which prevents to define the same class multiple times.

Parameters:

classData - the binary class data

hashStr - the hash string of the class data

Returns:

the defined class

Throws:

java.lang.LinkageError - if a class with the same name is already defined

getDefinedClass

public java.lang.Class getDefinedClass(java.lang.String hashStr)

Get an already defined class, addressed by the hash string of the class data.

Parameters:

hashStr - the hash string of the class data

Returns:

the already defined class, or null if no such class is defined