org.omegahat.Environment.System
Class DynamicClassLoader

java.lang.Object
  |
  +--java.lang.ClassLoader
        |
        +--org.omegahat.Environment.System.DynamicClassLoader

public class DynamicClassLoader

extends java.lang.ClassLoader

This class is designed to handle dynamically created classes. These are, for example, implementations of interfaces that are parameterized by Omegahat Functions and ExpressionInts. The trick in this class is that object defining the class is converted directly in memory to the byte array defining the class and the class defined from this representation. Thus, no file need ever be written to disk. Given an appropriate security model, this works nicely. If nothing else, it keeps the file namespace clean.

Field Summary

protected java.util.Hashtable

classTable

Constructor Summary

DynamicClassLoader()

DynamicClassLoader(java.lang.ClassLoader parent)

DynamicClassLoader(java.util.Hashtable table)

Method Summary

java.util.Hashtable	classTable()
java.util.Hashtable	classTable(java.util.Hashtable table)
java.lang.Class	defineClass(java.lang.Class sourceInterface) Defines and loads a new class that implements the specified interface using Omegahat interpreted functions or methods.
java.lang.Class	defineClass(jas.ClassEnv classDef, java.lang.String name)
java.lang.Class	defineClass(java.lang.Class sourceInterface, java.lang.String name) Define a new class, whose name is specified by name , that implements the specified interface and whose methods are implemented by evaluating interpreted Omegahat functions/methods.
java.lang.Class	defineClass(EvaluableInterfaceGenerator classDef) Allows the user to generate the template for generating the class' byte-code with more control while still using the class loader to actually manage the class in the Virtual Machine.
java.lang.Class	defineClass(java.lang.String interfaceName) Create and load a new class that implements the interface identified by interfaceName and is named FunctioninterfaceName (less package)
java.lang.Class	defineClass(java.lang.String[] interfaceNames, java.lang.String className)
java.lang.Class	defineClass(java.lang.String name, java.io.ByteArrayOutputStream stream)
java.lang.Class	defineClass(java.lang.String interfaceName, java.lang.String className) Create and load a new class that implements the interface identified by interfaceName and extends FunctionListener allowing the methods to be handled by a function or collection of functions, a Method.
java.lang.Class	loadClass(java.lang.String name, boolean resolve)
boolean	removeClass(java.lang.Class c)

Methods inherited from class java.lang.ClassLoader

defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, resolveClass, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

classTable

protected java.util.Hashtable classTable

Constructor Detail

DynamicClassLoader

public DynamicClassLoader()

DynamicClassLoader

public DynamicClassLoader(java.lang.ClassLoader parent)

DynamicClassLoader

public DynamicClassLoader(java.util.Hashtable table)

Method Detail

defineClass

public java.lang.Class defineClass(java.lang.String name,
                                   java.io.ByteArrayOutputStream stream)

defineClass

public java.lang.Class defineClass(java.lang.String interfaceName,
                                   java.lang.String className)
                            throws java.lang.ClassNotFoundException

Create and load a new class that implements the interface identified by interfaceName and extends FunctionListener allowing the methods to be handled by a function or collection of functions, a Method.

See Also:

defineClass(java.lang.String[], java.lang.String)

defineClass

public java.lang.Class defineClass(java.lang.String[] interfaceNames,
                                   java.lang.String className)
                            throws java.lang.ClassNotFoundException

defineClass

public java.lang.Class defineClass(java.lang.String interfaceName)
                            throws java.lang.ClassNotFoundException

Create and load a new class that implements the interface identified by interfaceName and is named FunctioninterfaceName (less package)

See Also:

defineClass(java.lang.String, java.lang.String)

defineClass

public java.lang.Class defineClass(java.lang.Class sourceInterface)

Defines and loads a new class that implements the specified interface using Omegahat interpreted functions or methods. The name of the new class is computed from the name of the interface being implemented by prefixing its actual class name (i.e. removing the package prefix) and prefixing it with the word Function. Allows the call to be of the form

defineClass(ActionListener)

rather than specifying strings.

See Also:

defineClass

public java.lang.Class defineClass(java.lang.Class sourceInterface,
                                   java.lang.String name)

Define a new class, whose name is specified by name , that implements the specified interface and whose methods are implemented by evaluating interpreted Omegahat functions/methods.

defineClass

public java.lang.Class defineClass(EvaluableInterfaceGenerator classDef)

Allows the user to generate the template for generating the class' byte-code with more control while still using the class loader to actually manage the class in the Virtual Machine.

loadClass

public java.lang.Class loadClass(java.lang.String name,
                                 boolean resolve)

Overrides:

loadClass in class java.lang.ClassLoader

defineClass

public java.lang.Class defineClass(jas.ClassEnv classDef,
                                   java.lang.String name)

classTable

public java.util.Hashtable classTable()

classTable

public java.util.Hashtable classTable(java.util.Hashtable table)

removeClass

public boolean removeClass(java.lang.Class c)