at.mug.iqm.core.registry

Class PluginRegistry

java.lang.Object

at.mug.iqm.core.registry.PluginRegistry

All Implemented Interfaces:

IPluginRegistry

public class PluginRegistry
extends Object
implements IPluginRegistry

The PluginRegistry maintains a static HashMap<String, IPlugin>, where all operators are put when IPlugin.init() is called.

The PluginRegistry can be queried for all currently loaded plugins and contains the unique names of the associated IOperator.

The PluginRegistry is designed as singleton.

Author:

Philipp Kainz

Field Summary

Fields

Modifier and Type	Field and Description
private static HashMap<String,String>	associatedOperators A HashMap containing the containing operator name in the plugin.
private static org.apache.log4j.Logger	logger Class specific logger.
private static HashMap<String,IPlugin>	pluginRegistry The HashMap containing the IPlugins registered at runtime.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	PluginRegistry() Private constructor, since PluginRegistry is a singleton.

Method Summary

Modifier and Type	Method and Description
String	findOperatorName(String pluginName) Gets the name of the operator associated with the plugin.
static IPluginRegistry	getInstance() Returns a reference to the singleton.
IPlugin	getPlugin(String pluginName) Gets the IPlugin instance from the registry.
HashMap<String,IPlugin>	getPlugins() Returns all registered plugins.
void	printAllRegisteredPlugins()
void	register(IPlugin plugin, String opName) Registers an IPlugin in the IQM registry with its name (String).
void	unregister(IPlugin plugin) Removes an IPlugin from the IQM registry.

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final org.apache.log4j.Logger logger

Class specific logger.

pluginRegistry

private static HashMap<String,IPlugin> pluginRegistry

The HashMap containing the IPlugins registered at runtime.

associatedOperators

private static HashMap<String,String> associatedOperators

A HashMap containing the containing operator name in the plugin.

Constructor Detail

PluginRegistry

private PluginRegistry()

Private constructor, since PluginRegistry is a singleton.

Method Detail

getInstance

public static IPluginRegistry getInstance()

Returns a reference to the singleton.

Returns:

the singleton instance of the PluginRegistry

register

public void register(IPlugin plugin,
                     String opName)

Description copied from interface: IPluginRegistry

Registers an IPlugin in the IQM registry with its name (String).

Specified by:

register in interface IPluginRegistry

unregister

public void unregister(IPlugin plugin)

Description copied from interface: IPluginRegistry

Removes an IPlugin from the IQM registry.

Specified by:

unregister in interface IPluginRegistry

getPlugin

public IPlugin getPlugin(String pluginName)
                  throws NoSuchElementException

Description copied from interface: IPluginRegistry

Gets the IPlugin instance from the registry.

Specified by:

getPlugin in interface IPluginRegistry

Parameters:

pluginName - the unique name of a plugin

Returns:

the instance of IPlugin

Throws:

NoSuchElementException - if the name is not registered

getPlugins

public HashMap<String,IPlugin> getPlugins()

Description copied from interface: IPluginRegistry

Returns all registered plugins.

Specified by:

getPlugins in interface IPluginRegistry

Returns:

a HashMap containing all plugins

findOperatorName

public String findOperatorName(String pluginName)
                        throws NoSuchElementException

Description copied from interface: IPluginRegistry

Gets the name of the operator associated with the plugin.

Specified by:

findOperatorName in interface IPluginRegistry

Parameters:

pluginName - the uid of a plugin

Returns:

the unique name of the operator

Throws:

NoSuchElementException - if the plugin is not registered

printAllRegisteredPlugins

public void printAllRegisteredPlugins()