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## bsh
Class BshClassManager

    java.lang.Object
      bsh.BshClassManager

public class BshClassManager
extends java.lang.Object

BshClassManager manages all classloading in BeanShell. It also supports a dynamically loaded extension (bsh.classpath package) which allows classpath extension and class file reloading. Currently the extension relies on 1.2 for BshClassLoader and weak references. See http://www.beanshell.org/manual/classloading.html for details on the bsh classloader architecture.

Bsh has a multi-tiered class loading architecture. No class loader is used unless/until the classpath is modified or a class is reloaded.

Nested Class Summary
`static interface` | `BshClassManager.Listener`

Field Summary
`protected java.util.Hashtable` | `absoluteClassCache` Global cache for things we know are classes.
`protected java.util.Hashtable` | `absoluteNonClasses` Global cache for things we know are *not* classes.
`protected java.util.Hashtable` | `definingClasses`
`protected java.util.Hashtable` | `definingClassesBaseNames`
`protected java.util.Hashtable` | `resolvedObjectMethods` Caches for resolved object and static methods.
`protected java.util.Hashtable` | `resolvedStaticMethods`

Constructor Summary
`BshClassManager()`

Method Summary
`void` | `addClassPath(java.net.URL path)`
`void` | `addListener(BshClassManager.Listener l)`
`void` | `cacheClassInfo(java.lang.String name, java.lang.Class value)` Cache info about whether name is a class or not.
`void` | `cacheResolvedMethod(java.lang.Class clas, java.lang.Class[] types, java.lang.reflect.Method method)` Cache a resolved (possibly overloaded) method based on the argument types used to invoke it, subject to classloader change.
`boolean` | `classExists(java.lang.String name)`
`java.lang.Class` | `classForName(java.lang.String name)` Load the specified class by name, taking into account added classpath and reloaded classes, etc.
`protected void` | `classLoaderChanged()`
`protected void` | `clearCaches()` Clear the caches in BshClassManager
`protected static UtilEvalError` | `cmUnavailable()`
`static BshClassManager` | `createClassManager(Interpreter interpreter)` Create a new instance of the class manager.
`java.lang.Class` | `defineClass(java.lang.String name, byte[] code)`
`protected void` | `definingClass(java.lang.String className)` Flag the class name as being in the process of being defined.
`protected void` | `doneDefiningClass(java.lang.String className)` Indicate that the specified class name has been defined and may be loaded normally.
`protected void` | `doSuperImport()` Support for "import *;" Hide details in here as opposed to NameSpace.
`void` | `dump(java.io.PrintWriter pw)`
`protected java.lang.String` | `getClassBeingDefined(java.lang.String className)` This method is a temporary workaround used with definingClass.
`protected java.lang.String` | `getClassNameByUnqName(java.lang.String name)` Return the name or null if none is found, Throw an ClassPathException containing detail if name is ambigous.
`protected java.lang.reflect.Method` | `getResolvedMethod(java.lang.Class clas, java.lang.String methodName, java.lang.Class[] types, boolean onlyStatic)` Return a previously cached resolved method.
`java.net.URL` | `getResource(java.lang.String path)` Get a resource URL using the BeanShell classpath
`java.io.InputStream` | `getResourceAsStream(java.lang.String path)` Get a resource stream using the BeanShell classpath
`protected boolean` | `hasSuperImport()` A "super import" ("import *") operation has been performed.
`protected boolean` | `isClassBeingDefined(java.lang.String className)`
`protected java.lang.Class` | `loadSourceClass(java.lang.String name)`
`protected static java.lang.Error` | `noClassDefFound(java.lang.String className, java.lang.Error e)` Annotate the NoClassDefFoundError with some info about the class we were trying to load.
`java.lang.Class` | `plainClassForName(java.lang.String name)` Perform a plain Class.forName() or call the externally provided classloader.
`void` | `reloadAllClasses()` Overlay the entire path with a new class loader.
`void` | `reloadClasses(java.lang.String[] classNames)` Reloading classes means creating a new classloader and using it whenever we are asked for classes in the appropriate space.
`void` | `reloadPackage(java.lang.String pack)` Reload all classes in the specified package: e.g.
`void` | `removeListener(BshClassManager.Listener l)`
`void` | `reset()` Clear all loaders and start over.
`void` | `setClassLoader(java.lang.ClassLoader externalCL)` Set an external class loader.
`void` | `setClassPath(java.net.URL[] cp)` Set a new base classpath and create a new base classloader.

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

Field Detail

### absoluteClassCache

    protected transient java.util.Hashtable absoluteClassCache

  Global cache for things we know are classes. Note: these should probably be re-implemented with Soft references. (as opposed to strong or Weak)

### absoluteNonClasses

    protected transient java.util.Hashtable absoluteNonClasses

  Global cache for things we know are *not* classes. Note: these should probably be re-implemented with Soft references. (as opposed to strong or Weak)

### resolvedObjectMethods

    protected transient java.util.Hashtable resolvedObjectMethods

  Caches for resolved object and static methods. We keep these maps separate to support fast lookup in the general case where the method may be either.

### resolvedStaticMethods

    protected transient java.util.Hashtable resolvedStaticMethods

### definingClasses

    protected transient java.util.Hashtable definingClasses

### definingClassesBaseNames

    protected transient java.util.Hashtable definingClassesBaseNames

Constructor Detail

### BshClassManager

    public BshClassManager()

Method Detail

### createClassManager

    public static BshClassManager createClassManager(Interpreter interpreter)

  Create a new instance of the class manager. Class manager instnaces are now associated with the interpreter.

  See Also:
    `bsh.Interpreter.getClassManager()`, `bsh.Interpreter.setClassLoader( ClassLoader )`

### classExists

    public boolean classExists(java.lang.String name)

### classForName

    public java.lang.Class classForName(java.lang.String name)

  Load the specified class by name, taking into account added classpath and reloaded classes, etc.

  Returns:
    the class or null

### loadSourceClass

    protected java.lang.Class loadSourceClass(java.lang.String name)

### plainClassForName

    public java.lang.Class plainClassForName(java.lang.String name)
                                      throws java.lang.ClassNotFoundException

  Perform a plain Class.forName() or call the externally provided classloader. If a BshClassManager implementation is loaded the call will be delegated to it, to allow for additional hooks.

  This simply wraps that bottom level class lookup call and provides a central point for monitoring and handling certain Java version dependent bugs, etc.

  Returns:
    the class
  Throws:
    `java.lang.ClassNotFoundException`
  See Also:
    `classForName( String )`

### getResource

    public java.net.URL getResource(java.lang.String path)

  Get a resource URL using the BeanShell classpath

  Parameters:
    `path` - should be an absolute path

### getResourceAsStream

    public java.io.InputStream getResourceAsStream(java.lang.String path)

  Get a resource stream using the BeanShell classpath

  Parameters:
    `path` - should be an absolute path

### cacheClassInfo

    public void cacheClassInfo(java.lang.String name,
                               java.lang.Class value)

  Cache info about whether name is a class or not.

  Parameters:
    `value` - if value is non-null, cache the class if value is null, set the flag that it is *not* a class to speed later resolution

### cacheResolvedMethod

    public void cacheResolvedMethod(java.lang.Class clas,
                                    java.lang.Class[] types,
                                    java.lang.reflect.Method method)

  Cache a resolved (possibly overloaded) method based on the argument types used to invoke it, subject to classloader change. Static and Object methods are cached separately to support fast lookup in the general case where either will do.

### getResolvedMethod

    protected java.lang.reflect.Method getResolvedMethod(java.lang.Class clas,
                                                         java.lang.String methodName,
                                                         java.lang.Class[] types,
                                                         boolean onlyStatic)

  Return a previously cached resolved method.

  Parameters:
    `onlyStatic` - specifies that only a static method may be returned.
  Returns:
    the Method or null

### clearCaches

    protected void clearCaches()

  Clear the caches in BshClassManager

  See Also:
    `void #reset() for external usage`

### setClassLoader

    public void setClassLoader(java.lang.ClassLoader externalCL)

  Set an external class loader. BeanShell will use this at the same point it would otherwise use the plain Class.forName(). i.e. if no explicit classpath management is done from the script (addClassPath(), setClassPath(), reloadClasses()) then BeanShell will only use the supplied classloader. If additional classpath management is done then BeanShell will perform that in addition to the supplied external classloader. However BeanShell is not currently able to reload classes supplied through the external classloader.

### addClassPath

    public void addClassPath(java.net.URL path)
                      throws java.io.IOException

  Throws:
    `java.io.IOException`

### reset

    public void reset()

  Clear all loaders and start over. No class loading.

### setClassPath

    public void setClassPath(java.net.URL[] cp)
                      throws UtilEvalError

  Set a new base classpath and create a new base classloader. This means all types change.

  Throws:
    `UtilEvalError`

### reloadAllClasses

    public void reloadAllClasses()
                          throws UtilEvalError

  Overlay the entire path with a new class loader. Set the base path to the user path + base path. No point in including the boot class path (can't reload thos).

  Throws:
    `UtilEvalError`

### reloadClasses

    public void reloadClasses(java.lang.String[] classNames)
                       throws UtilEvalError

  Reloading classes means creating a new classloader and using it whenever we are asked for classes in the appropriate space. For this we use a DiscreteFilesClassLoader

  Throws:
    `UtilEvalError`

### reloadPackage

    public void reloadPackage(java.lang.String pack)
                       throws UtilEvalError

  Reload all classes in the specified package: e.g. "com.sun.tools" The special package name "" can be used to refer to unpackaged classes.

  Throws:
    `UtilEvalError`

### doSuperImport

    protected void doSuperImport()
                          throws UtilEvalError

  Support for "import *;" Hide details in here as opposed to NameSpace.

  Throws:
    `UtilEvalError`

### hasSuperImport

    protected boolean hasSuperImport()

  A "super import" ("import *") operation has been performed.

### getClassNameByUnqName

    protected java.lang.String getClassNameByUnqName(java.lang.String name)
                                              throws UtilEvalError

  Return the name or null if none is found, Throw an ClassPathException containing detail if name is ambigous.

  Throws:
    `UtilEvalError`

### addListener

    public void addListener(BshClassManager.Listener l)

### removeListener

    public void removeListener(BshClassManager.Listener l)

### dump

    public void dump(java.io.PrintWriter pw)

### definingClass

    protected void definingClass(java.lang.String className)

  Flag the class name as being in the process of being defined. The class manager will not attempt to load it.

### isClassBeingDefined

    protected boolean isClassBeingDefined(java.lang.String className)

### getClassBeingDefined

    protected java.lang.String getClassBeingDefined(java.lang.String className)

  This method is a temporary workaround used with definingClass. It is to be removed at some point.

### doneDefiningClass

    protected void doneDefiningClass(java.lang.String className)

  Indicate that the specified class name has been defined and may be loaded normally.

### defineClass

    public java.lang.Class defineClass(java.lang.String name,
                                       byte[] code)

### classLoaderChanged

    protected void classLoaderChanged()

### noClassDefFound

    protected static java.lang.Error noClassDefFound(java.lang.String className,
                                                     java.lang.Error e)

  Annotate the NoClassDefFoundError with some info about the class we were trying to load.

### cmUnavailable

    protected static UtilEvalError cmUnavailable()

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