org.abstracthorizon.extend.server.support
Class ClassUtils

java.lang.Object
  org.abstracthorizon.extend.server.support.ClassUtils

public class ClassUtils
extends Object

Utility class that contains class and url tool methods.

Author:

Daniel Sendula

Nested Class Summary

static class

ClassUtils.LocalURLClassLoader

Constructor Summary

ClassUtils()

Method Summary

static Collection<URL>	collectFiles(URL url) Collects files from given url.
static Collection<URL>	collectFilesFromJar(URL original, JarFile jarFile) Collects files from jar file (root of)
static Collection<URL>	collectFilesFromPath(File path) Collects files from given path
static Collection<URL>	collectFilesFromURL(URL url) Collects files from give (generic) url
static URLClassLoader	createClassLoader(ClassLoader parent, URL lib) Creates class loader for given url.
static URL	getHomeLocation(Class<?> cls) Gets home location.
static void	invokeMethod(Object object, String methodName, boolean mustBePresent) Invokes parametherless method with given name.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassUtils

public ClassUtils()

Method Detail

invokeMethod

public static void invokeMethod(Object object,
                                String methodName,
                                boolean mustBePresent)

Invokes parametherless method with given name. If mustBePresent is set to true NoSuchMethodException is propagated wrapped in RuntimeException.

Parameters:

object - instance on which method is going to be executed

methodName - method name

mustBePresent - if set then method must be present or NoSuchMethodError is thrown

Throws:

RuntimeException - if NoSuchMethodException, IllegalArgumentException, IllegalAccessException or InvocationTargetException is thrown.

createClassLoader

public static URLClassLoader createClassLoader(ClassLoader parent,
                                               URL lib)

Creates class loader for given url. If url is directory then it is scanned and all jar files from it added to classpath.

Parameters:

parent - parent class loader or null

lib - url class loader to be created for.

Returns:

ClassUtils.LocalURLClassLoader instance

collectFiles

public static Collection<URL> collectFiles(URL url)
                                    throws IOException

Collects files from given url.

Parameters:

url - url

Returns:

collection of urls

Throws:

IOException

collectFilesFromPath

public static Collection<URL> collectFilesFromPath(File path)
                                            throws IOException

Collects files from given path

Parameters:

path - directory

Returns:

collection of urls

Throws:

IOException

collectFilesFromJar

public static Collection<URL> collectFilesFromJar(URL original,
                                                  JarFile jarFile)
                                           throws IOException

Collects files from jar file (root of)

Parameters:

original - original url

jarFile - jar file

Returns:

collection of urls

Throws:

IOException

collectFilesFromURL

public static Collection<URL> collectFilesFromURL(URL url)
                                           throws IOException

Collects files from give (generic) url

Parameters:

url - url

Returns:

collection of files

Throws:

IOException

getHomeLocation

public static URL getHomeLocation(Class<?> cls)
                           throws MalformedURLException

Gets home location.

Returns:

home location

Throws:

MalformedURLException