weka.core

Class ClassDiscovery

java.lang.Object

weka.core.ClassDiscovery

All Implemented Interfaces:

RevisionHandler

public class ClassDiscovery
extends Object
implements RevisionHandler

This class is used for discovering classes that implement a certain interface or a derived from a certain class.

Version:

$Revision: 10203 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

ClassDiscovery.StringCompare

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ClassDiscovery.StringCompare compares two strings.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	VERBOSE whether to output some debug information.

Constructor Summary

Constructors

Constructor and Description
ClassDiscovery()

Method Summary

Methods

Modifier and Type	Method and Description
static void	clearCache() clears the cache for class/classnames queries.
static void	clearClassCache() Calls clearCache() and resets the cache of classes on the classpath (i.e.
static Vector<String>	find(Class<?> cls, String pkgname) Checks the given package for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.
static Vector<String>	find(Class<?> cls, String[] pkgnames) Checks the given packages for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.
static ArrayList<String>	find(String matchText) Find all classes that have the supplied matchText String in their suffix.
static Vector<String>	find(String classname, String pkgname) Checks the given package for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.
static Vector<String>	find(String classname, String[] pkgnames) Checks the given packages for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.
static Vector<String>	findPackages() Lists all packages it can find in the classpath.
String	getRevision() Returns the revision string.
static boolean	hasInterface(Class<?> intf, Class<?> cls) Checks whether the given class implements the given interface.
static boolean	hasInterface(String intf, String cls) Checks whether the given class implements the given interface.
static boolean	isSubclass(Class<?> superclass, Class<?> otherclass) Checks whether the "otherclass" is a subclass of the given "superclass".
static boolean	isSubclass(String superclass, String otherclass) Checks whether the "otherclass" is a subclass of the given "superclass".
static void	main(String[] args) Possible calls: weka.core.ClassDiscovery <packages> Prints all the packages in the current classpath weka.core.ClassDiscovery <classname> <packagename(s)> Prints the classes it found.

Methods inherited from class java.lang.Object

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

Field Detail

VERBOSE

public static final boolean VERBOSE

whether to output some debug information.

See Also:

Constant Field Values

Constructor Detail

ClassDiscovery

public ClassDiscovery()

Method Detail

isSubclass

public static boolean isSubclass(String superclass,
                 String otherclass)

Checks whether the "otherclass" is a subclass of the given "superclass".

Parameters:

superclass - the superclass to check against

otherclass - this class is checked whether it is a subclass of the the superclass

Returns:

TRUE if "otherclass" is a true subclass

isSubclass

public static boolean isSubclass(Class<?> superclass,
                 Class<?> otherclass)

Checks whether the "otherclass" is a subclass of the given "superclass".

Parameters:

superclass - the superclass to check against

otherclass - this class is checked whether it is a subclass of the the superclass

Returns:

TRUE if "otherclass" is a true subclass

hasInterface

public static boolean hasInterface(String intf,
                   String cls)

Checks whether the given class implements the given interface.

Parameters:

intf - the interface to look for in the given class

cls - the class to check for the interface

Returns:

TRUE if the class contains the interface

hasInterface

public static boolean hasInterface(Class<?> intf,
                   Class<?> cls)

Checks whether the given class implements the given interface.

Parameters:

intf - the interface to look for in the given class

cls - the class to check for the interface

Returns:

TRUE if the class contains the interface

find

public static Vector<String> find(String classname,
                  String[] pkgnames)

Checks the given packages for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.

Parameters:

classname - the class/interface to look for

pkgnames - the packages to search in

Returns:

a list with all the found classnames

find

public static Vector<String> find(String classname,
                  String pkgname)

Checks the given package for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.

Parameters:

classname - the class/interface to look for

pkgname - the package to search in

Returns:

a list with all the found classnames

find

public static Vector<String> find(Class<?> cls,
                  String[] pkgnames)

Checks the given packages for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.

Parameters:

cls - the class/interface to look for

pkgnames - the packages to search in

Returns:

a list with all the found classnames

find

public static ArrayList<String> find(String matchText)

Find all classes that have the supplied matchText String in their suffix.

Parameters:

matchText - the text to match

Returns:

an array list of matching fully qualified class names.

find

public static Vector<String> find(Class<?> cls,
                  String pkgname)

Checks the given package for classes that inherited from the given class, in case it's a class, or implement this class, in case it's an interface.

Parameters:

cls - the class/interface to look for

pkgname - the package to search in

Returns:

a list with all the found classnames

findPackages

public static Vector<String> findPackages()

Lists all packages it can find in the classpath.

Returns:

a list with all the found packages

clearCache

public static void clearCache()

clears the cache for class/classnames queries.

clearClassCache

public static void clearClassCache()

Calls clearCache() and resets the cache of classes on the classpath (i.e. forces a rescan of the classpath).

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision

main

public static void main(String[] args)

Possible calls:

• weka.core.ClassDiscovery <packages>
  Prints all the packages in the current classpath
• weka.core.ClassDiscovery <classname> <packagename(s)>
  Prints the classes it found.

Parameters:

args - the commandline arguments