org.apache.bcel.util

## Class ClassLoader

- java.lang.Object
- - java.lang.ClassLoader
  - - org.apache.bcel.util.ClassLoader

- Deprecated.
  6.0 Do not use - does not work

      @Deprecated
      public class ClassLoader
      extends 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."

  Version:
    $Id: ClassLoader.java 1806200 2017-08-25 16:33:06Z ggregory $
  See Also:
    `JavaWrapper`, `ClassPath`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String[]` | `DEFAULT_IGNORED_PACKAGES` Deprecated.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ClassLoader()` Deprecated. Ignored packages are by default ( "java.", "sun.", "javax."), i.e.
    `ClassLoader(ClassLoader deferTo)` Deprecated.
    `ClassLoader(ClassLoader deferTo, String[] ignored_packages)` Deprecated.
    `ClassLoader(String[] ignored_packages)` Deprecated.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected JavaClass` | `createClass(String class_name)` Deprecated. Override this method to create you own classes on the fly.
    `protected Class<?>` | `loadClass(String class_name, boolean resolve)` Deprecated.
    `protected JavaClass` | `modifyClass(JavaClass clazz)` Deprecated. 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, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### DEFAULT_IGNORED_PACKAGES

          public static final String[] DEFAULT_IGNORED_PACKAGES

      Deprecated.

  - ### Constructor Detail

    - #### ClassLoader

          public ClassLoader()

      Deprecated.
      Ignored packages are by default ( "java.", "sun.", "javax."), i.e. loaded by system class loader

    - #### ClassLoader

          public ClassLoader(ClassLoader deferTo)

      Deprecated.
      Parameters:
        `deferTo` - delegate class loader to use for ignored packages

    - #### ClassLoader

          public ClassLoader(String[] ignored_packages)

      Deprecated.
      Parameters:
        `ignored_packages` - classes contained in these packages will be loaded with the system class loader

    - #### ClassLoader

          public ClassLoader(ClassLoader deferTo,
                             String[] ignored_packages)

      Deprecated.
      Parameters:
        `ignored_packages` - classes contained in these packages will be loaded with the system class loader
        `deferTo` - delegate class loader to use for ignored packages

  - ### Method Detail

    - #### loadClass

          protected Class<?> loadClass(String class_name,
                                       boolean resolve)
                                throws ClassNotFoundException

      Deprecated.
      Overrides:
        `loadClass` in class `ClassLoader`
      Throws:
        `ClassNotFoundException`

    - #### modifyClass

          protected JavaClass modifyClass(JavaClass clazz)

      Deprecated.
      Override this method if you want to alter a class before it gets actually loaded. Does nothing by default.

    - #### createClass

          protected JavaClass createClass(String class_name)

      Deprecated.
      Override this method to create you own classes on the fly. The name contains the special token $$BCEL$$. Everything before that token is considered to be a package name. You can encode your own arguments into the subsequent string. You must ensure however not to use any "illegal" characters, i.e., characters that may not appear in a Java class name too
      The default implementation interprets the string as a encoded compressed Java class, unpacks and decodes it with the Utility.decode() method, and parses the resulting byte array and returns the resulting JavaClass object.
      Parameters:
        `class_name` - compressed byte code with "$$BCEL$$" in it

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