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Java Source Code / Java Documentation » Test Coverage » GroboUtils » net.sourceforge.groboutils.util.classes.v1 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sourceforge.groboutils.util.classes.v1.SPILoader

SPILoader
public class SPILoader (Code)
Loads Service Provider Interface (SPI) classes from the given classloader (if any). This will search for files in the form /META-INF/services/classname. The discovered file will be parsed using java.util.Properties parsing method, but only the keys will be recognized (note that if a line contains no ':' or '=', then the line will be recognized as a key with an empty-string value). The found keys will be used as class names, constructed, and returned, using the ClassLoadHelper class in this package.

This is intended to follow the SPI interface spec, partially described in the JDK 1.4 documentation in the package docs for java.awt.im.spi.

Note that by using a Properties instance, this class is limited to only one instance of a class type per META-INF service file. This is assumed to be an adequate restriction, since in most circumstances, there should only be one instance of a service provider loaded per need.
author:
   Matt Albrecht groboclown@users.sourceforge.net
since:
   June 28, 2002
version:
   $Date: 2003/05/08 14:12:21 $




Constructor Summary
public  SPILoader(Class spiBase)
     Use the context (thread) classloader or the system class loader.
Parameters:
  spiBase - the base class that all loaded SPI classes mustimplement.
public  SPILoader(Class spiBase, ClassLoader cl)
     Create a new SPILoader, loading the service files from the given class loader classpath.

Method Summary
public  booleanhasNext()
     Discovers if there is another provider class instance to load.
public  ObjectnextProvier()
     Returns a new instance of the next class name.


Constructor Detail
SPILoader
public SPILoader(Class spiBase) throws IOException(Code)
Use the context (thread) classloader or the system class loader.
Parameters:
  spiBase - the base class that all loaded SPI classes mustimplement. This is also used to define the name of the filesto load from the META-INF directory.
exception:
  IOException - if there is an I/O problem loading theinitial set of resources.



SPILoader
public SPILoader(Class spiBase, ClassLoader cl) throws IOException(Code)
Create a new SPILoader, loading the service files from the given class loader classpath. If cl is null, then the context (thread) class loader or system class loader will be used instead.
Parameters:
  spiBase - the base class that all loaded SPI classes mustimplement. This is also used to define the name of the filesto load from the META-INF directory.
Parameters:
  cl - classloader to load files from.
exception:
  IOException - if there is an I/O problem loading theinitial set of resources.




Method Detail
hasNext
public boolean hasNext() throws IOException(Code)
Discovers if there is another provider class instance to load. true if there is another provider, otherwisefalse.



nextProvier
public Object nextProvier() throws IOException(Code)
Returns a new instance of the next class name. If the defined next class is invalid, then an IOException is thrown. The returned object is guaranteed to be non-null and an instance of the constructor baseClass. the next provider in the list of discovered SPI providers.
exception:
  IOException - if there was an I/O error, or if the referencedresource defines an invalid class to load.
exception:
  NoSuchElementException - if the enumeration is already atthe end of the list.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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