org.codehaus.plexus
Interface PlexusContainer

All Known Subinterfaces:
MutablePlexusContainer
All Known Implementing Classes:
DefaultPlexusContainer

public interface PlexusContainer

PlexusContainer is the entry-point for loading and accessing other components.


Field Summary
static java.lang.String ROLE
           
 
Method Summary
 void addComponent(java.lang.Object component, java.lang.String role)
           
<T> void
addComponent(T component, java.lang.Class<?> role, java.lang.String roleHint)
          Adds live component instance to this container.
 void addComponentDescriptor(ComponentDescriptor<?> componentDescriptor)
          Adds a component descriptor to this container. componentDescriptor should have realmId set.
 void addContextValue(java.lang.Object key, java.lang.Object value)
          Add a key/value pair to this container's Context.
 org.codehaus.plexus.classworlds.realm.ClassRealm createChildRealm(java.lang.String id)
           
 java.util.List<ComponentDescriptor<?>> discoverComponents(org.codehaus.plexus.classworlds.realm.ClassRealm childRealm)
          Discovers components in the given realm.
 java.util.List<ComponentDescriptor<?>> discoverComponents(org.codehaus.plexus.classworlds.realm.ClassRealm realm, java.lang.Object data)
           
 void dispose()
          Disposes of this container, which in turn disposes all of it's components.
<T> ComponentDescriptor<T>
getComponentDescriptor(java.lang.Class<T> type, java.lang.String role, java.lang.String roleHint)
          Returns the ComponentDescriptor with the given component role and hint.
 ComponentDescriptor<?> getComponentDescriptor(java.lang.String role)
          Returns the ComponentDescriptor with the given component role and the default role hint.
 ComponentDescriptor<?> getComponentDescriptor(java.lang.String role, java.lang.String roleHint)
          Returns the ComponentDescriptor with the given component role and hint.
<T> java.util.List<ComponentDescriptor<T>>
getComponentDescriptorList(java.lang.Class<T> type, java.lang.String role)
          Returns a List of ComponentDescriptors with the given role.
 java.util.List<ComponentDescriptor<?>> getComponentDescriptorList(java.lang.String role)
          Returns a List of ComponentDescriptors with the given role.
<T> java.util.Map<java.lang.String,ComponentDescriptor<T>>
getComponentDescriptorMap(java.lang.Class<T> type, java.lang.String role)
          Returns a Map of ComponentDescriptors with the given role, keyed by role-hint.
 java.util.Map<java.lang.String,ComponentDescriptor<?>> getComponentDescriptorMap(java.lang.String role)
          Returns a Map of ComponentDescriptors with the given role, keyed by role-hint.
 org.codehaus.plexus.classworlds.realm.ClassRealm getComponentRealm(java.lang.String realmId)
           
 org.codehaus.plexus.classworlds.realm.ClassRealm getContainerRealm()
          Returns the Classworld's ClassRealm of this Container, which acts as the default parent for all contained components.
 Context getContext()
          Returns this container's context.
 org.codehaus.plexus.classworlds.realm.ClassRealm getLookupRealm()
          Returns the lookup realm for this container, which is either the container realm or the realm set by setLookupRealm(ClassRealm).
 org.codehaus.plexus.classworlds.realm.ClassRealm getLookupRealm(java.lang.Object component)
          XXX ideally i'd like to place this in a plexus container specific utility class.
 boolean hasComponent(java.lang.Class<?> type)
          Returns true if this container has a component with the given role/role-hint.
 boolean hasComponent(java.lang.Class<?> type, java.lang.String roleHint)
          Returns true if this container has a component with the given role/role-hint.
 boolean hasComponent(java.lang.Class<?> type, java.lang.String role, java.lang.String roleHint)
          Returns true if this container has a component with the given role/role-hint.
 boolean hasComponent(java.lang.String role)
          Returns true if this container has the keyed component.
 boolean hasComponent(java.lang.String role, java.lang.String roleHint)
          Returns true if this container has a component with the given role/role-hint.
<T> T
lookup(java.lang.Class<T> type)
          Looks up and returns a component object with the given unique key or role.
<T> T
lookup(java.lang.Class<T> type, java.lang.String roleHint)
          Looks up and returns a component object with the given unique role/role-hint combination.
<T> T
lookup(java.lang.Class<T> type, java.lang.String role, java.lang.String roleHint)
          Looks up and returns a component object with the given unique role/role-hint combination.
<T> T
lookup(ComponentDescriptor<T> componentDescriptor)
          Looks up and returns a component object matching the given component descriptor.
 java.lang.Object lookup(java.lang.String role)
          Looks up and returns a component object with the given unique key or role.
 java.lang.Object lookup(java.lang.String role, java.lang.String roleHint)
          Looks up and returns a component object with the given unique role/role-hint combination.
<T> java.util.List<T>
lookupList(java.lang.Class<T> type)
          Looks up and returns a List of component objects with the given role.
<T> java.util.List<T>
lookupList(java.lang.Class<T> type, java.util.List<java.lang.String> roleHints)
          Looks up and returns a List of component objects with the given role.
 java.util.List<java.lang.Object> lookupList(java.lang.String role)
          Looks up and returns a List of component objects with the given role.
 java.util.List<java.lang.Object> lookupList(java.lang.String role, java.util.List<java.lang.String> roleHints)
          Looks up and returns a List of component objects with the given role.
<T> java.util.Map<java.lang.String,T>
lookupMap(java.lang.Class<T> type)
          Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
<T> java.util.Map<java.lang.String,T>
lookupMap(java.lang.Class<T> type, java.util.List<java.lang.String> roleHints)
          Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
 java.util.Map<java.lang.String,java.lang.Object> lookupMap(java.lang.String role)
          Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
 java.util.Map<java.lang.String,java.lang.Object> lookupMap(java.lang.String role, java.util.List<java.lang.String> roleHints)
          Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
 void registerComponentDiscoveryListener(ComponentDiscoveryListener listener)
          Adds the listener to this container.
 void release(java.lang.Object component)
          Releases the component from the container.
 void releaseAll(java.util.List<?> components)
          Releases all Listed components from the container.
 void releaseAll(java.util.Map<java.lang.String,?> components)
          Releases all Mapped component values from the container.
 void removeComponentDiscoveryListener(ComponentDiscoveryListener listener)
          Removes the listener from this container.
 void removeComponentRealm(org.codehaus.plexus.classworlds.realm.ClassRealm componentRealm)
          Dissociate the realm with the specified id from the container.
 org.codehaus.plexus.classworlds.realm.ClassRealm setLookupRealm(org.codehaus.plexus.classworlds.realm.ClassRealm realm)
          Sets the lookup realm to use for lookup calls that don't have a ClassRealm parameter.
 

Field Detail

ROLE

static final java.lang.String ROLE
Method Detail

lookup

java.lang.Object lookup(java.lang.String role)
                        throws ComponentLookupException
Looks up and returns a component object with the given unique key or role.

Parameters:
role - a unique key for the desired component
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookup

java.lang.Object lookup(java.lang.String role,
                        java.lang.String roleHint)
                        throws ComponentLookupException
Looks up and returns a component object with the given unique role/role-hint combination.

Parameters:
role - a non-unique key for the desired component
roleHint - a hint for the desired component implementation
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookup

<T> T lookup(java.lang.Class<T> type)
         throws ComponentLookupException
Looks up and returns a component object with the given unique key or role.

Parameters:
type - the unique type of the component within the container
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookup

<T> T lookup(java.lang.Class<T> type,
             java.lang.String roleHint)
         throws ComponentLookupException
Looks up and returns a component object with the given unique role/role-hint combination.

Parameters:
type - the non-unique type of the component
roleHint - a hint for the desired component implementation
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookup

<T> T lookup(java.lang.Class<T> type,
             java.lang.String role,
             java.lang.String roleHint)
         throws ComponentLookupException
Looks up and returns a component object with the given unique role/role-hint combination.

Parameters:
type - the non-unique type of the component
role - a non-unique key for the desired component
roleHint - a hint for the desired component implementation
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookup

<T> T lookup(ComponentDescriptor<T> componentDescriptor)
         throws ComponentLookupException
Looks up and returns a component object matching the given component descriptor.

Parameters:
componentDescriptor - the descriptor of the component
Returns:
a Plexus component object
Throws:
ComponentLookupException

lookupList

java.util.List<java.lang.Object> lookupList(java.lang.String role)
                                            throws ComponentLookupException
Looks up and returns a List of component objects with the given role.

Parameters:
role - a non-unique key for the desired components
Returns:
a List of component objects
Throws:
ComponentLookupException

lookupList

java.util.List<java.lang.Object> lookupList(java.lang.String role,
                                            java.util.List<java.lang.String> roleHints)
                                            throws ComponentLookupException
Looks up and returns a List of component objects with the given role.

Parameters:
role - a non-unique key for the desired components
Returns:
a List of component objects
Throws:
ComponentLookupException

lookupList

<T> java.util.List<T> lookupList(java.lang.Class<T> type)
                             throws ComponentLookupException
Looks up and returns a List of component objects with the given role.

Parameters:
type - the non-unique type of the components
Returns:
a List of component objects
Throws:
ComponentLookupException

lookupList

<T> java.util.List<T> lookupList(java.lang.Class<T> type,
                                 java.util.List<java.lang.String> roleHints)
                             throws ComponentLookupException
Looks up and returns a List of component objects with the given role.

Parameters:
type - the non-unique type of the components
Returns:
a List of component objects
Throws:
ComponentLookupException

lookupMap

java.util.Map<java.lang.String,java.lang.Object> lookupMap(java.lang.String role)
                                                           throws ComponentLookupException
Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.

Parameters:
role - a non-unique key for the desired components
Returns:
a Map of component objects
Throws:
ComponentLookupException

lookupMap

java.util.Map<java.lang.String,java.lang.Object> lookupMap(java.lang.String role,
                                                           java.util.List<java.lang.String> roleHints)
                                                           throws ComponentLookupException
Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.

Parameters:
role - a non-unique key for the desired components
Returns:
a Map of component objects
Throws:
ComponentLookupException

lookupMap

<T> java.util.Map<java.lang.String,T> lookupMap(java.lang.Class<T> type)
                                            throws ComponentLookupException
Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.

Parameters:
type - the non-unique type of the components
Returns:
a Map of component objects
Throws:
ComponentLookupException

lookupMap

<T> java.util.Map<java.lang.String,T> lookupMap(java.lang.Class<T> type,
                                                java.util.List<java.lang.String> roleHints)
                                            throws ComponentLookupException
Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.

Parameters:
type - the non-unique type of the components
Returns:
a Map of component objects
Throws:
ComponentLookupException

getComponentDescriptor

ComponentDescriptor<?> getComponentDescriptor(java.lang.String role)
Returns the ComponentDescriptor with the given component role and the default role hint. Searches up the hierarchy until one is found, null if none is found.

Parameters:
role - a unique role for the desired component's descriptor
Returns:
the ComponentDescriptor with the given component role

getComponentDescriptor

ComponentDescriptor<?> getComponentDescriptor(java.lang.String role,
                                              java.lang.String roleHint)
Returns the ComponentDescriptor with the given component role and hint. Searches up the hierarchy until one is found, null if none is found.

Parameters:
role - a unique role for the desired component's descriptor
roleHint - a hint showing which implementation should be used
Returns:
the ComponentDescriptor with the given component role

getComponentDescriptor

<T> ComponentDescriptor<T> getComponentDescriptor(java.lang.Class<T> type,
                                                  java.lang.String role,
                                                  java.lang.String roleHint)
Returns the ComponentDescriptor with the given component role and hint. Searches up the hierarchy until one is found, null if none is found.

Parameters:
type - the Java type of the desired component
role - a unique role for the desired component's descriptor
roleHint - a hint showing which implementation should be used
Returns:
the ComponentDescriptor with the given component role

getComponentDescriptorMap

java.util.Map<java.lang.String,ComponentDescriptor<?>> getComponentDescriptorMap(java.lang.String role)
Returns a Map of ComponentDescriptors with the given role, keyed by role-hint. Searches up the hierarchy until all are found, an empty Map if none are found.

Parameters:
role - a non-unique key for the desired components
Returns:
a Map of component descriptors keyed by role-hint

getComponentDescriptorMap

<T> java.util.Map<java.lang.String,ComponentDescriptor<T>> getComponentDescriptorMap(java.lang.Class<T> type,
                                                                                     java.lang.String role)
Returns a Map of ComponentDescriptors with the given role, keyed by role-hint. Searches up the hierarchy until all are found, an empty Map if none are found.

Parameters:
type - the Java type of the desired components
role - a non-unique key for the desired components
Returns:
a Map of component descriptors keyed by role-hint

getComponentDescriptorList

java.util.List<ComponentDescriptor<?>> getComponentDescriptorList(java.lang.String role)
Returns a List of ComponentDescriptors with the given role. Searches up the hierarchy until all are found, an empty List if none are found.

Parameters:
role - a non-unique key for the desired components
Returns:
a List of component descriptors

getComponentDescriptorList

<T> java.util.List<ComponentDescriptor<T>> getComponentDescriptorList(java.lang.Class<T> type,
                                                                      java.lang.String role)
Returns a List of ComponentDescriptors with the given role. Searches up the hierarchy until all are found, an empty List if none are found.

Parameters:
type - the Java type of the desired components
role - a non-unique key for the desired components
Returns:
a List of component descriptors

addComponentDescriptor

void addComponentDescriptor(ComponentDescriptor<?> componentDescriptor)
                            throws CycleDetectedInComponentGraphException
Adds a component descriptor to this container. componentDescriptor should have realmId set.

Parameters:
componentDescriptor -
Throws:
ComponentRepositoryException
CycleDetectedInComponentGraphException

release

void release(java.lang.Object component)
             throws ComponentLifecycleException
Releases the component from the container. This is dependent upon how the implementation manages the component, but usually enacts some standard lifecycle shutdown procedure on the component. In every case, the component is no longer accessible from the container (unless another is created).

Parameters:
component - the plexus component object to release
Throws:
ComponentLifecycleException

releaseAll

void releaseAll(java.util.Map<java.lang.String,?> components)
                throws ComponentLifecycleException
Releases all Mapped component values from the container.

Parameters:
components - Map of plexus component objects to release
Throws:
ComponentLifecycleException
See Also:
release( Object component )

releaseAll

void releaseAll(java.util.List<?> components)
                throws ComponentLifecycleException
Releases all Listed components from the container.

Parameters:
components - List of plexus component objects to release
Throws:
ComponentLifecycleException
See Also:
release( Object component )

hasComponent

boolean hasComponent(java.lang.String role)
Returns true if this container has the keyed component.

Parameters:
role - a non-unique key for the desired component
Returns:
true if this container has the keyed component

hasComponent

boolean hasComponent(java.lang.String role,
                     java.lang.String roleHint)
Returns true if this container has a component with the given role/role-hint.

Parameters:
role - a non-unique key for the desired component
roleHint - a hint for the desired component implementation
Returns:
true if this container has a component with the given role/role-hint

hasComponent

boolean hasComponent(java.lang.Class<?> type)
Returns true if this container has a component with the given role/role-hint.

Parameters:
type - the non-unique type of the component
Returns:
true if this container has a component with the given role/role-hint

hasComponent

boolean hasComponent(java.lang.Class<?> type,
                     java.lang.String roleHint)
Returns true if this container has a component with the given role/role-hint.

Parameters:
type - the non-unique type of the component
roleHint - a hint for the desired component implementation
Returns:
true if this container has a component with the given role/role-hint

hasComponent

boolean hasComponent(java.lang.Class<?> type,
                     java.lang.String role,
                     java.lang.String roleHint)
Returns true if this container has a component with the given role/role-hint.

Parameters:
type - the non-unique type of the component
role - a non-unique key for the desired component
roleHint - a hint for the desired component implementation
Returns:
true if this container has a component with the given role/role-hint

dispose

void dispose()
Disposes of this container, which in turn disposes all of it's components. This container should also remove itself from the container hierarchy.


addContextValue

void addContextValue(java.lang.Object key,
                     java.lang.Object value)
Add a key/value pair to this container's Context.

Parameters:
key - any unique object valid to the Context's implementation
value - any object valid to the Context's implementation

getContext

Context getContext()
Returns this container's context. A Context is a simple data store used to hold values which may alter the execution of the Container.

Returns:
this container's context.

getContainerRealm

org.codehaus.plexus.classworlds.realm.ClassRealm getContainerRealm()
Returns the Classworld's ClassRealm of this Container, which acts as the default parent for all contained components.

Returns:
the ClassRealm of this Container

registerComponentDiscoveryListener

void registerComponentDiscoveryListener(ComponentDiscoveryListener listener)
Adds the listener to this container. ComponentDiscoveryListeners have the ability to respond to various ComponentDiscoverer events.

Parameters:
listener - A listener which responds to different ComponentDiscoveryEvents

removeComponentDiscoveryListener

void removeComponentDiscoveryListener(ComponentDiscoveryListener listener)
Removes the listener from this container.

Parameters:
listener - A listener to remove

discoverComponents

java.util.List<ComponentDescriptor<?>> discoverComponents(org.codehaus.plexus.classworlds.realm.ClassRealm childRealm)
                                                          throws PlexusConfigurationException,
                                                                 CycleDetectedInComponentGraphException
Discovers components in the given realm.

Parameters:
childRealm -
override - whether to override/merge any conflicting components, where the new component takes precedence.
Returns:
Throws:
PlexusConfigurationException
ComponentRepositoryException
CycleDetectedInComponentGraphException

discoverComponents

java.util.List<ComponentDescriptor<?>> discoverComponents(org.codehaus.plexus.classworlds.realm.ClassRealm realm,
                                                          java.lang.Object data)
                                                          throws PlexusConfigurationException,
                                                                 CycleDetectedInComponentGraphException
Throws:
PlexusConfigurationException
CycleDetectedInComponentGraphException

createChildRealm

org.codehaus.plexus.classworlds.realm.ClassRealm createChildRealm(java.lang.String id)

getComponentRealm

org.codehaus.plexus.classworlds.realm.ClassRealm getComponentRealm(java.lang.String realmId)

removeComponentRealm

void removeComponentRealm(org.codehaus.plexus.classworlds.realm.ClassRealm componentRealm)
                          throws PlexusContainerException
Dissociate the realm with the specified id from the container. This will remove all components contained in the realm from the component repository.

Parameters:
componentRealm - Realm to remove from the container.
Throws:
PlexusContainerException

getLookupRealm

org.codehaus.plexus.classworlds.realm.ClassRealm getLookupRealm()
Returns the lookup realm for this container, which is either the container realm or the realm set by setLookupRealm(ClassRealm).


setLookupRealm

org.codehaus.plexus.classworlds.realm.ClassRealm setLookupRealm(org.codehaus.plexus.classworlds.realm.ClassRealm realm)
Sets the lookup realm to use for lookup calls that don't have a ClassRealm parameter.

Parameters:
realm - the new realm to use.
Returns:
The previous lookup realm. It is advised to set it back once the old-style lookups have completed.

getLookupRealm

org.codehaus.plexus.classworlds.realm.ClassRealm getLookupRealm(java.lang.Object component)
XXX ideally i'd like to place this in a plexus container specific utility class. Utility method to retrieve the lookup realm for a component instance. If the component's classloader is a ClassRealm, that realm is returned, otherwise the result of getLookupRealm is returned.

Parameters:
component -
Returns:

addComponent

void addComponent(java.lang.Object component,
                  java.lang.String role)
                  throws CycleDetectedInComponentGraphException
Throws:
CycleDetectedInComponentGraphException

addComponent

<T> void addComponent(T component,
                      java.lang.Class<?> role,
                      java.lang.String roleHint)
Adds live component instance to this container. Component instance is not associated with any class realm and will be ignored during lookup is lookup realm is provided using thread context classloader.



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