org.java.plugin.registry.xml
Class PluginRegistryImpl

java.lang.Object
  org.java.plugin.registry.xml.PluginRegistryImpl

All Implemented Interfaces:

PluginRegistry

public final class PluginRegistryImpl
extends java.lang.Object
implements PluginRegistry

This is an implementation of plug-in registry of XML syntax plug-in manifests. Manifests should be prepared according to plug-in DTD.

Configuration parameters

This registry implementation supports following configuration parameters:

isValidating

Regulates is registry should use validating parser when loading plug-in manifests. The default parameter value is true.

stopOnError

Regulates is registry should stop and throw RuntimeException if an error occurred while registering or un-registering plug-ins. If this is false, the registration errors will be stored in the internal report that is available with PluginRegistry.checkIntegrity(PathResolver) method. The default parameter value is false.

Version:

$Id: PluginRegistryImpl.java,v 1.6 2007/05/13 16:10:51 ddimon Exp $

See Also:

ObjectFactory.createRegistry()

Nested Class Summary

Nested classes/interfaces inherited from interface org.java.plugin.registry.PluginRegistry

PluginRegistry.RegistryChangeData, PluginRegistry.RegistryChangeListener

Constructor Summary

PluginRegistryImpl()
Creates plug-in registry object.

Method Summary

IntegrityCheckReport	checkIntegrity(PathResolver pathResolver) Performs integrity check of all registered plug-ins and generates result as a collection of standard report items.
IntegrityCheckReport	checkIntegrity(PathResolver pathResolver, boolean includeRegistrationReport) Performs integrity check of all registered plug-ins and generates result as a collection of standard report items.
void	configure(ExtendedProperties config) Configures this registry instance.
java.lang.String	extractId(java.lang.String uniqueId) Extracts plug-in element ID from some unique identifier.
java.lang.String	extractPluginId(java.lang.String uniqueId) Extracts plug-in ID from some unique identifier.
Version	extractVersion(java.lang.String uniqueId) Extracts plug-in version identifier from some unique identifier (plug-in or plug-in fragment).
java.util.Collection<PluginDescriptor>	getDependingPlugins(PluginDescriptor descr) Utility method that recursively collects all plug-ins that depends on the given plug-in.
ExtensionPoint	getExtensionPoint(java.lang.String uniqueId) Looks for extension point.
ExtensionPoint	getExtensionPoint(java.lang.String pluginId, java.lang.String pointId) Looks for extension point.
PluginDescriptor	getPluginDescriptor(java.lang.String pluginId) Returns descriptor of plug-in with given ID.
java.util.Collection<PluginDescriptor>	getPluginDescriptors() Returns collection of descriptors of all plug-ins that was successfully populated by this registry.
java.util.Collection<PluginFragment>	getPluginFragments() Returns collection of descriptors of all plug-in fragments that was successfully populated by this registry.
IntegrityCheckReport	getRegistrationReport()
boolean	isExtensionPointAvailable(java.lang.String uniqueId) Checks if extension point exists and is in valid state.
boolean	isExtensionPointAvailable(java.lang.String pluginId, java.lang.String pointId) Checks if extension point exists and is in valid state.
boolean	isPluginDescriptorAvailable(java.lang.String pluginId) Checks if plug-in exists and is in valid state.
java.lang.String	makeUniqueId(java.lang.String pluginId, java.lang.String id) Constructs unique identifier for some plug-in element from it's ID.
java.lang.String	makeUniqueId(java.lang.String pluginId, Version version) Constructs unique identifier for plug-in with given ID.
ManifestInfo	readManifestInfo(java.net.URL url) Reads basic information from a plug-in or plug-in fragment manifest.
java.util.Map<java.lang.String,Identity>	register(java.net.URL[] manifests) General algorithm: Collect all currently registered extension points.
void	registerListener(PluginRegistry.RegistryChangeListener listener) Registers plug-in registry change event listener.
java.util.Collection<java.lang.String>	unregister(java.lang.String[] ids) Unregisters plug-ins and plug-in fragments with given ID's (including depending plug-ins and plug-in fragments).
void	unregisterListener(PluginRegistry.RegistryChangeListener listener) Unregisters registry change event listener.

Methods inherited from class java.lang.Object

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

Constructor Detail

PluginRegistryImpl

public PluginRegistryImpl()

Creates plug-in registry object.

Method Detail

configure

public void configure(ExtendedProperties config)

Description copied from interface: PluginRegistry

Configures this registry instance. Usually this method is called from object factory implementation.

Specified by:

configure in interface PluginRegistry

Parameters:

config - registry configuration data

See Also:

PluginRegistry.configure( ExtendedProperties)

readManifestInfo

public ManifestInfo readManifestInfo(java.net.URL url)
                              throws ManifestProcessingException

Description copied from interface: PluginRegistry

Reads basic information from a plug-in or plug-in fragment manifest.

Specified by:

readManifestInfo in interface PluginRegistry

Parameters:

url - manifest data URL

Returns:

manifest info

Throws:

ManifestProcessingException - if manifest data can't be read

See Also:

PluginRegistry.readManifestInfo( java.net.URL)

register

public java.util.Map<java.lang.String,Identity> register(java.net.URL[] manifests)
                                                  throws ManifestProcessingException

General algorithm:

1. Collect all currently registered extension points.
2. Parse given URL's as XML content files and separate them on plug-in and plug-in fragment descriptors.
3. Process new plug-in descriptors first:
   1. Instantiate new PluginDescriptorImpl object.
   2. Handle versions correctly - register new descriptor as most recent version or as an old version.
   3. If other versions of the same plug-in already registered, take their fragments and register them with this version.
4. Process new plug-in fragments next:
   1. Instantiate new PluginFragmentImpl object.
   2. Check if older version of the same fragment already registered. If yes, un-register it and move to old plug-in fragments collection.
   3. Register new fragment with all matches plug-in descriptors (if this fragment is of most recent version).
5. Notify collected extension points about potential changes in extensions set.
6. Propagate events about registry changes.

Specified by:

register in interface PluginRegistry

Parameters:

manifests - array of manifest locations

Returns:

map where keys are URL's and values are registered plug-ins or plug-in fragments, URL's for unprocessed manifests are not included

Throws:

ManifestProcessingException - if manifest processing error has occurred (optional behavior)

See Also:

PluginRegistry.register(java.net.URL[])

unregister

public java.util.Collection<java.lang.String> unregister(java.lang.String[] ids)

Description copied from interface: PluginRegistry

Unregisters plug-ins and plug-in fragments with given ID's (including depending plug-ins and plug-in fragments).

Specified by:

unregister in interface PluginRegistry

Parameters:

ids - ID's of plug-ins and plug-in fragments to be unregistered

Returns:

collection of UID's of actually unregistered plug-ins and plug-in fragments

See Also:

PluginRegistry.unregister(java.lang.String[])

getExtensionPoint

public ExtensionPoint getExtensionPoint(java.lang.String pluginId,
                                        java.lang.String pointId)

Description copied from interface: PluginRegistry

Looks for extension point. This method have throw an IllegalArgumentException if requested extension point can't be found or is in invalid state.

Specified by:

getExtensionPoint in interface PluginRegistry

Parameters:

pluginId - plug-in ID

pointId - extension point ID

Returns:

plug-in extension point

See Also:

PluginRegistry.getExtensionPoint( java.lang.String, java.lang.String)

getExtensionPoint

public ExtensionPoint getExtensionPoint(java.lang.String uniqueId)

Description copied from interface: PluginRegistry

Looks for extension point.

Specified by:

getExtensionPoint in interface PluginRegistry

Parameters:

uniqueId - extension point unique ID

Returns:

plug-in extension point

See Also:

PluginRegistry.getExtensionPoint(java.lang.String)

isExtensionPointAvailable

public boolean isExtensionPointAvailable(java.lang.String pluginId,
                                         java.lang.String pointId)

Description copied from interface: PluginRegistry

Checks if extension point exists and is in valid state. If this method returns true, the method PluginRegistry.getExtensionPoint(String, String) should always return valid extension point.

Specified by:

isExtensionPointAvailable in interface PluginRegistry

Parameters:

pluginId - plug-in ID

pointId - extension point ID

Returns:

true if extension point exists and valid

See Also:

PluginRegistry.isExtensionPointAvailable( java.lang.String, java.lang.String)

isExtensionPointAvailable

public boolean isExtensionPointAvailable(java.lang.String uniqueId)

Description copied from interface: PluginRegistry

Checks if extension point exists and is in valid state.

Specified by:

isExtensionPointAvailable in interface PluginRegistry

Parameters:

uniqueId - extension point unique ID

Returns:

true if extension point exists and valid

See Also:

PluginRegistry.isExtensionPointAvailable( java.lang.String)

getPluginDescriptor

public PluginDescriptor getPluginDescriptor(java.lang.String pluginId)

Description copied from interface: PluginRegistry

Returns descriptor of plug-in with given ID.
If plug-in descriptor with given ID can't be found or such plug-in exists but is damaged this method have to throw an IllegalArgumentException. In other words, this method shouldn't return null.

Specified by:

getPluginDescriptor in interface PluginRegistry

Parameters:

pluginId - plug-id ID

Returns:

plug-in descriptor

See Also:

PluginRegistry.getPluginDescriptor(java.lang.String)

isPluginDescriptorAvailable

public boolean isPluginDescriptorAvailable(java.lang.String pluginId)

Description copied from interface: PluginRegistry

Checks if plug-in exists and is in valid state. If this method returns true, the method PluginRegistry.getPluginDescriptor(String) should always return valid plug-in descriptor.

Specified by:

isPluginDescriptorAvailable in interface PluginRegistry

Parameters:

pluginId - plug-in ID

Returns:

true if plug-in exists and valid

See Also:

PluginRegistry.isPluginDescriptorAvailable(java.lang.String)

getPluginDescriptors

public java.util.Collection<PluginDescriptor> getPluginDescriptors()

Description copied from interface: PluginRegistry

Returns collection of descriptors of all plug-ins that was successfully populated by this registry.

Specified by:

getPluginDescriptors in interface PluginRegistry

Returns:

collection of PluginDescriptor objects

See Also:

PluginRegistry.getPluginDescriptors()

getPluginFragments

public java.util.Collection<PluginFragment> getPluginFragments()

Description copied from interface: PluginRegistry

Returns collection of descriptors of all plug-in fragments that was successfully populated by this registry.

Specified by:

getPluginFragments in interface PluginRegistry

Returns:

collection of PluginFragment objects

See Also:

PluginRegistry.getPluginFragments()

getDependingPlugins

public java.util.Collection<PluginDescriptor> getDependingPlugins(PluginDescriptor descr)

Description copied from interface: PluginRegistry

Utility method that recursively collects all plug-ins that depends on the given plug-in.

Specified by:

getDependingPlugins in interface PluginRegistry

Parameters:

descr - descriptor of plug-in to collect dependencies for

Returns:

collection of plug-in descriptors that depend on given plug-in

See Also:

PluginRegistry.getDependingPlugins( org.java.plugin.registry.PluginDescriptor)

checkIntegrity

public IntegrityCheckReport checkIntegrity(PathResolver pathResolver)

Description copied from interface: PluginRegistry

Performs integrity check of all registered plug-ins and generates result as a collection of standard report items.

Specified by:

checkIntegrity in interface PluginRegistry

Parameters:

pathResolver - optional path resolver

Returns:

integrity check report

See Also:

PluginRegistry.checkIntegrity( org.java.plugin.PathResolver)

checkIntegrity

public IntegrityCheckReport checkIntegrity(PathResolver pathResolver,
                                           boolean includeRegistrationReport)

Description copied from interface: PluginRegistry

Performs integrity check of all registered plug-ins and generates result as a collection of standard report items.

Specified by:

checkIntegrity in interface PluginRegistry

Parameters:

pathResolver - optional path resolver

includeRegistrationReport - if true, the plug-ins registration report will be included into resulting report

Returns:

integrity check report

See Also:

PluginRegistry.checkIntegrity( org.java.plugin.PathResolver, boolean)

getRegistrationReport

public IntegrityCheckReport getRegistrationReport()

Specified by:

getRegistrationReport in interface PluginRegistry

Returns:

plug-ins registration report for this registry

See Also:

PluginRegistry.getRegistrationReport()

makeUniqueId

public java.lang.String makeUniqueId(java.lang.String pluginId,
                                     java.lang.String id)

Description copied from interface: PluginRegistry

Constructs unique identifier for some plug-in element from it's ID.

Specified by:

makeUniqueId in interface PluginRegistry

Parameters:

pluginId - plug-in ID

id - element ID

Returns:

unique ID

See Also:

PluginRegistry.makeUniqueId( java.lang.String, java.lang.String)

makeUniqueId

public java.lang.String makeUniqueId(java.lang.String pluginId,
                                     Version version)

Description copied from interface: PluginRegistry

Constructs unique identifier for plug-in with given ID.

Specified by:

makeUniqueId in interface PluginRegistry

Parameters:

pluginId - plug-in ID

version - plug-in version identifier

Returns:

unique plug-in ID

See Also:

PluginRegistry.makeUniqueId( java.lang.String, org.java.plugin.registry.Version)

extractPluginId

public java.lang.String extractPluginId(java.lang.String uniqueId)

Description copied from interface: PluginRegistry

Extracts plug-in ID from some unique identifier.

Specified by:

extractPluginId in interface PluginRegistry

Parameters:

uniqueId - unique ID

Returns:

plug-in ID

See Also:

PluginRegistry.extractPluginId(java.lang.String)

extractId

public java.lang.String extractId(java.lang.String uniqueId)

Description copied from interface: PluginRegistry

Extracts plug-in element ID from some unique identifier.

Specified by:

extractId in interface PluginRegistry

Parameters:

uniqueId - unique ID

Returns:

element ID

See Also:

PluginRegistry.extractId(java.lang.String)

extractVersion

public Version extractVersion(java.lang.String uniqueId)

Description copied from interface: PluginRegistry

Extracts plug-in version identifier from some unique identifier (plug-in or plug-in fragment).

Specified by:

extractVersion in interface PluginRegistry

Parameters:

uniqueId - unique ID

Returns:

plug-in version identifier

See Also:

PluginRegistry.extractVersion(java.lang.String)

registerListener

public void registerListener(PluginRegistry.RegistryChangeListener listener)

Description copied from interface: PluginRegistry

Registers plug-in registry change event listener. If given listener has been registered before, this method should throw an IllegalArgumentException.

Specified by:

registerListener in interface PluginRegistry

Parameters:

listener - new registry change event listener

See Also:

PluginRegistry.registerListener( org.java.plugin.registry.PluginRegistry.RegistryChangeListener)

unregisterListener

public void unregisterListener(PluginRegistry.RegistryChangeListener listener)

Description copied from interface: PluginRegistry

Unregisters registry change event listener. If given listener hasn't been registered before, this method should throw an IllegalArgumentException.

Specified by:

unregisterListener in interface PluginRegistry

Parameters:

listener - registered listener

See Also:

PluginRegistry.unregisterListener( org.java.plugin.registry.PluginRegistry.RegistryChangeListener)