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oracle.adf.controller.metadata
Class MetadataService

java.lang.Object
oracle.adf.controller.metadata.MetadataService

public abstract class MetadataService

extends java.lang.Object

An interface to the ADFc metadata service.. There may be different sources of metadata. To support this different MetadataResourceProviders may be pluged into this service the provide metadata from different sources.

The default MetadataResourceProviders uses MDS. A different metadata resource provider can be configured by setting the system property oracle.adfinternal.controller.metadata_provider to the fully qualified class name of a class that extends this class.

Metadata is initially loaded from a collection of ADF metadata resources. This collection of ADFc resources is constructed using the following search rules:

• Locate all resources named META-INF/adfc-config.xml on the classpath.
• Check for the existence of a web application configuration resource named /WEB-INF/adfc-config.xml, and load it if the resource exists.

Once the ADFc resources are loaded they may contain references to metadata objects that reside in other resources. ADFc metadata resources are used to construct a model for unnbounded task flow. Metadata for bounded task flows is loaded on demand.

Constructor Summary

MetadataService()

Method Summary

abstract boolean	addAdfcConfig(org.w3c.dom.Document document) Adds top level adfc-config element to the existing DOM document.
abstract Activity	getActivity(ActivityId id) Get an activity with a given ID.
abstract java.util.List<java.lang.String>	getAdfcResourceNames() Returns a list of all the names of loaded ADFc unbounded task flow definition files.
abstract PageFlow	getAdfPageFlow() Get the unbounded ADF page flow.
static MetadataService	getInstance()
static MetadataService	getInstance(MetadataResourceProvider provider, AdfcResourceNameProvider resourceNameProvider) Metadata service based on a specific providers.
abstract MetadataResource	getMutableMetadataResource(java.lang.String resourceName, boolean useCustomizations, boolean skipIntegrityValidation) Returns a metadata resource that can be mutated.
abstract TaskFlowDefinition	getTaskFlowDefinition(TaskFlowId id) Get a task flow definition.
abstract TaskFlowDefinition	getTaskFlowTemplate(TaskFlowId id) Get a task flow template.
abstract void	reinitialize(java.util.List<java.lang.String> resources)
static void	setFactory(MetadataServiceFactory metadataServiceFactory) Specifies a MetadataServiceFactory to be used.

Methods inherited from class java.lang.Object

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

Constructor Detail

MetadataService

public MetadataService()

Method Detail

addAdfcConfig

public abstract boolean addAdfcConfig(org.w3c.dom.Document document)

Adds top level adfc-config element to the existing DOM document. adfc-config element must be present before any DT@RT operations are performed.

Parameters:

document - a DOM document

Returns:

true, if adfc-config element was successfully added, false otherwise.

getInstance

public static MetadataService getInstance()

Returns:

a singleton MetadataService instance for this application.

getInstance

public static MetadataService getInstance(MetadataResourceProvider provider,
                                          AdfcResourceNameProvider resourceNameProvider)

Metadata service based on a specific providers.

Parameters:

provider - metadata resource provider

resourceNameProvider - adfc resource name provider

Returns:

a singleton MetadataService instance for this application.

setFactory

public static void setFactory(MetadataServiceFactory metadataServiceFactory)

Specifies a MetadataServiceFactory to be used. Must be called before any usage of getInstance method.

Parameters:

metadataServiceFactory - an instance of MetadataServiceFactory

getActivity

public abstract Activity getActivity(ActivityId id)

Get an activity with a given ID.

Parameters:

id - activity ID

Returns:

the requested activity or null if it could not be found.

getAdfPageFlow

public abstract PageFlow getAdfPageFlow()

Get the unbounded ADF page flow. This is the page flow that exists outside of all task flows.

Returns:

the ADF page flow.

getTaskFlowDefinition

public abstract TaskFlowDefinition getTaskFlowDefinition(TaskFlowId id)

Get a task flow definition.

Parameters:

id - the ID of the task flow definition.

Returns:

the requested task flow definition or null if it could not be found.

getTaskFlowTemplate

public abstract TaskFlowDefinition getTaskFlowTemplate(TaskFlowId id)

Get a task flow template.

Parameters:

id - the ID of the task flow template.

Returns:

the requested task flow template definition or null if it could not be found.

getMutableMetadataResource

public abstract MetadataResource getMutableMetadataResource(java.lang.String resourceName,
                                                            boolean useCustomizations,
                                                            boolean skipIntegrityValidation)

Returns a metadata resource that can be mutated. Any changes to ADFc metadata should be done using this resource. The changes are not going to be visible to ADFc runtime until they are commited, on the next request. If the MetadataResourceProvider does not support updating, returns null.

Parameters:

resourceName - the name of XML document that represents the metadata, for example, "/WEB-INF/adfc-config.xml".

useCustomizations - a boolean flag that indicates whether customizations should be loaded with the base document, and whether changes to the metadata resource should be saved as a customization.

skipIntegrityValidation - if true, the Controller will not attempt to validate whether modifications to this resource preseve its integrity. For example, if integratity validation is skipped, it is possible to add a control flow rule for which the source or target activities do not exists. All validations are peformed against the document model that existed at the beginning of the request. This flag should be used so that multiple artifacts can be added to ADFc model in a single request, such as a view activity and a corresponding control flow rule. This flag does not disable all of the validation logic, however, only the logic that depends on the current document context.

Returns:

mutable metadata resource or null, if resource corresponding to this name cannot be found or the metadata provider does not support update.

reinitialize

public abstract void reinitialize(java.util.List<java.lang.String> resources)

Parameters:

resources - a list of bootstrap metadata resource files

getAdfcResourceNames

public abstract java.util.List<java.lang.String> getAdfcResourceNames()

Returns a list of all the names of loaded ADFc unbounded task flow definition files. These are sometimes referred to as bootstrap configuration files. Some of the file names may correspond to a resource that occurrs multiple times. For example, /META-INF/adfc-config.xml.

Returns:

a list of bootstrap configuration files

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