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java.lang.Object | +--java.lang.ClassLoader | +--org.apache.bcel.util.ClassLoader
Drop in replacement for the standard class loader of the JVM. You can use it in conjunction with the JavaWrapper to dynamically modify/create classes as they're requested.
This class loader recognizes special requests in a distinct format, i.e., when the name of the requested class contains with "$$BCEL$$" it calls the createClass() method with that name (everything bevor the $$BCEL$$ is considered to be the package name. You can subclass the class loader and override that method. "Normal" classes class can be modified by overriding the modifyClass() method which is called just before defineClass().
There may be a number of packages where you have to use the default class loader (which may also be faster). You can define the set of packages where to use the system class loader in the constructor. The default value contains "java.", "sun.", "javax."
JavaWrapper
,
ClassPath
Constructor Summary | |
ClassLoader()
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ClassLoader(java.lang.ClassLoader deferTo)
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ClassLoader(java.lang.ClassLoader deferTo,
java.lang.String[] ignored_packages)
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ClassLoader(java.lang.String[] ignored_packages)
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Method Summary | |
protected JavaClass |
createClass(java.lang.String class_name)
Override this method to create you own classes on the fly. |
protected java.lang.Class |
loadClass(java.lang.String class_name,
boolean resolve)
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protected JavaClass |
modifyClass(JavaClass clazz)
Override this method if you want to alter a class before it gets actually loaded. |
Methods inherited from class java.lang.ClassLoader |
clearAssertionStatus, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ClassLoader()
public ClassLoader(java.lang.ClassLoader deferTo)
public ClassLoader(java.lang.String[] ignored_packages)
ignored_packages
- classes contained in these packages will be loaded
with the system class loaderpublic ClassLoader(java.lang.ClassLoader deferTo, java.lang.String[] ignored_packages)
Method Detail |
protected java.lang.Class loadClass(java.lang.String class_name, boolean resolve) throws java.lang.ClassNotFoundException
loadClass
in class java.lang.ClassLoader
java.lang.ClassNotFoundException
protected JavaClass modifyClass(JavaClass clazz)
protected JavaClass createClass(java.lang.String class_name)
class_name
- compressed byte code with "$$BCEL$$" in it
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