com.helger.commons.lang

Class ClassLoaderHelper

java.lang.Object

com.helger.commons.lang.ClassLoaderHelper

@Immutable
public final class ClassLoaderHelper
extends Object

ClassLoader utility methods.

Author:

Philip Helger

Method Summary

Modifier and Type	Method and Description
static ClassLoader	getClassClassLoader(Class<?> aClass)
static ClassLoader	getContextClassLoader()
static ClassLoader	getDefaultClassLoader()
static ClassLoader	getParentClassLoader(ClassLoader aClassLoader)
static URL	getResource(ClassLoader aClassLoader, String sPath) Get the URL of the passed resource using the specified class loader only.
static InputStream	getResourceAsStream(ClassLoader aClassLoader, String sPath) Get the input stream of the passed resource using the specified class loader only.
static Enumeration<URL>	getResources(ClassLoader aClassLoader, String sPath) Get all URLs of the passed resource using the specified class loader only.
static ClassLoader	getSystemClassLoader()
static void	setContextClassLoader(ClassLoader aClassLoader)

Methods inherited from class java.lang.Object

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

Method Detail

getSystemClassLoader

@Nonnull
public static ClassLoader getSystemClassLoader()

getContextClassLoader

@Nullable
public static ClassLoader getContextClassLoader()

setContextClassLoader

public static void setContextClassLoader(@Nonnull
                                         ClassLoader aClassLoader)

getClassClassLoader

@Nullable
public static ClassLoader getClassClassLoader(@Nonnull
                                                         Class<?> aClass)

getParentClassLoader

@Nullable
public static ClassLoader getParentClassLoader(@Nonnull
                                                          ClassLoader aClassLoader)

getDefaultClassLoader

@Nonnull
public static ClassLoader getDefaultClassLoader()

getResource

@Nullable
public static URL getResource(@Nonnull
                                         ClassLoader aClassLoader,
                                         @Nonnull @Nonempty
                                         String sPath)

Get the URL of the passed resource using the specified class loader only. This is a sanity wrapper around classLoader.getResource (sPath).

Parameters:

aClassLoader - The class loader to be used. May not be null.

sPath - The path to be resolved. May neither be null nor empty. Internally it is ensured that the provided path does NOT start with a slash.

Returns:

null if the path could not be resolved using the specified class loader.

getResources

@Nonnull
public static Enumeration<URL> getResources(@Nonnull
                                                      ClassLoader aClassLoader,
                                                      @Nonnull @Nonempty
                                                      String sPath)
                                               throws IOException

Get all URLs of the passed resource using the specified class loader only. This is a sanity wrapper around classLoader.getResources (sPath).

Parameters:

aClassLoader - The class loader to be used. May not be null.

sPath - The path to be resolved. May neither be null nor empty. Internally it is ensured that the provided path does NOT start with a slash.

Returns:

null if the path could not be resolved using the specified class loader.

Throws:

IOException - In case an internal error occurs.

getResourceAsStream

@Nullable
public static InputStream getResourceAsStream(@Nonnull
                                                         ClassLoader aClassLoader,
                                                         @Nonnull @Nonempty
                                                         String sPath)

Get the input stream of the passed resource using the specified class loader only. This is a sanity wrapper around classLoader.getResourceAsStream (sPath).

Parameters:

aClassLoader - The class loader to be used. May not be null.

sPath - The path to be resolved. May neither be null nor empty. Internally it is ensured that the provided path does NOT start with a slash.

Returns:

null if the path could not be resolved using the specified class loader.