Package org.apache.commons.discovery

Class ResourceClass<T>

java.lang.Object

org.apache.commons.discovery.Resource

org.apache.commons.discovery.ResourceClass<T>

Type Parameters:

T - The SPI type

public class ResourceClass<T>
extends Resource

'Resource' located by discovery. Naming of methods becomes a real pain ('getClass()') so I've patterned this after ClassLoader... I think it works well as it will give users a point-of-reference.

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.Class<? extends T>	resourceClass

Fields inherited from class org.apache.commons.discovery.Resource

loader, name, resource

Constructor Summary

Constructors

Constructor	Description
ResourceClass(java.lang.Class<S> resourceClass, java.net.URL resource)	Create a new Resource class located by discovery.
ResourceClass(java.lang.String resourceName, java.net.URL resource, java.lang.ClassLoader loader)	Create a new Resource class located by discovery.

Method Summary

Modifier and Type	Method	Description
<S extends T> java.lang.Class<S>	loadClass()	Get the value of resourceClass.
static void	setLog(org.apache.commons.logging.Log _log)	Deprecated. This method is not thread-safe
java.lang.String	toString()

Methods inherited from class org.apache.commons.discovery.Resource

getClassLoader, getName, getResource, getResourceAsStream, toArray

Methods inherited from class java.lang.Object

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

Field Detail

resourceClass

protected java.lang.Class<? extends T> resourceClass

Constructor Detail

ResourceClass

public ResourceClass(java.lang.Class<S> resourceClass,
                     java.net.URL resource)

Create a new Resource class located by discovery.

Type Parameters:

S - Any type extends T

Parameters:

resourceClass - The resource class has to be located

resource - The resource URL has to be located

ResourceClass

public ResourceClass(java.lang.String resourceName,
                     java.net.URL resource,
                     java.lang.ClassLoader loader)

Create a new Resource class located by discovery.

Parameters:

resourceName - The resource class name has to be located

resource - The resource URL has to be located

loader - The class loaders holder

Method Detail

setLog

@Deprecated
public static void setLog(org.apache.commons.logging.Log _log)

Deprecated.

This method is not thread-safe

Sets the Log for this class.

Parameters:

_log - This class Log

loadClass

public <S extends T> java.lang.Class<S> loadClass()

Get the value of resourceClass. Loading the class does NOT guarentee that the class can be instantiated. Go figure. The class can be instantiated when the class is linked/resolved, and all dependencies are resolved. Various JDKs do this at different times, so beware: java.lang.NoClassDefFoundError when calling Class.getDeclaredMethod() (JDK14), java.lang.reflect.InvocationTargetException (wrapping java.lang.NoClassDefFoundError) when calling java.lang.newInstance (JDK13), and who knows what else..

Type Parameters:

S - Any type extends T

Returns:

value of resourceClass.

toString

public java.lang.String toString()

Overrides:

toString in class Resource