ch.qos.logback.core.util

Class Loader

java.lang.Object

ch.qos.logback.core.util.Loader

public class Loader
extends Object

Load resources (or images) from various sources.

Field Summary

Fields

Modifier and Type	Field and Description
static String	IGNORE_TCL_PROPERTY_NAME

Constructor Summary

Constructors

Constructor and Description
Loader()

Method Summary

Modifier and Type	Method and Description
static ClassLoader	getClassLoaderAsPrivileged(Class<?> clazz) Returns the class loader of clazz in an access privileged section.
static ClassLoader	getClassLoaderOfClass(Class<?> clazz) Return the class loader which loaded the class passed as argument.
static ClassLoader	getClassLoaderOfObject(Object o) Get the class loader of the object passed as argument.
static URL	getResource(String resource, ClassLoader classLoader) Search for a resource using the classloader passed as parameter.
static URL	getResourceBySelfClassLoader(String resource) Attempt to find a resource by using the classloader that loaded this class, namely Loader.class.
static Set<URL>	getResourceOccurrenceCount(String resource, ClassLoader classLoader) Compute the number of occurrences a resource can be found by a class loader.
static ClassLoader	getTCL() Get the Thread Context Loader which is a JDK 1.2 feature.
static Class<?>	loadClass(String clazz) If running under JDK 1.2 load the specified class using the Thread contextClassLoader if that fails try Class.forname.
static Class<?>	loadClass(String clazz, Context context)

Methods inherited from class java.lang.Object

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

Field Detail

IGNORE_TCL_PROPERTY_NAME

public static final String IGNORE_TCL_PROPERTY_NAME

See Also:

Constant Field Values

Constructor Detail

Loader

public Loader()

Method Detail

getResourceOccurrenceCount

public static Set<URL> getResourceOccurrenceCount(String resource,
                                                  ClassLoader classLoader)
                                           throws IOException

Compute the number of occurrences a resource can be found by a class loader.

Parameters:

resource - the resource name to look for

classLoader - the classloader used for the search

Returns:

matching resource URLs

Throws:

IOException

getResource

public static URL getResource(String resource,
                              ClassLoader classLoader)

Search for a resource using the classloader passed as parameter.

Parameters:

resource - the resource name to look for

classLoader - the classloader used for the search

getResourceBySelfClassLoader

public static URL getResourceBySelfClassLoader(String resource)

Attempt to find a resource by using the classloader that loaded this class, namely Loader.class.

Parameters:

resource - the resource name to look for

Returns:

resource URL

getTCL

public static ClassLoader getTCL()

Get the Thread Context Loader which is a JDK 1.2 feature. If we are running under JDK 1.1 or anything else goes wrong the method returns null.

Returns:

the thread context loader

loadClass

public static Class<?> loadClass(String clazz,
                                 Context context)
                          throws ClassNotFoundException

Parameters:

clazz - the name of the class to find

context - the logging context

Returns:

the class

Throws:

ClassNotFoundException - if class not found

getClassLoaderOfObject

public static ClassLoader getClassLoaderOfObject(Object o)

Get the class loader of the object passed as argument. Return the system class loader if appropriate.

Parameters:

o - object to evaluate

Returns:

the classloader of the object

getClassLoaderAsPrivileged

public static ClassLoader getClassLoaderAsPrivileged(Class<?> clazz)

Returns the class loader of clazz in an access privileged section.

Parameters:

clazz - the class to evaluate

Returns:

the classloader of the object

getClassLoaderOfClass

public static ClassLoader getClassLoaderOfClass(Class<?> clazz)

Return the class loader which loaded the class passed as argument. Return the system class loader if appropriate.

Parameters:

clazz - the class to evaluate

Returns:

the classloader of the object

loadClass

public static Class<?> loadClass(String clazz)
                          throws ClassNotFoundException

If running under JDK 1.2 load the specified class using the Thread contextClassLoader if that fails try Class.forname. Under JDK 1.1 only Class.forName is used.

Parameters:

clazz - the name of the class to find

Returns:

the class

Throws:

ClassNotFoundException