oracle.portal.provider.v2.http
Class DefaultProviderLoader

java.lang.Object
  oracle.portal.provider.v2.ProviderLoader
      oracle.portal.provider.v2.http.DefaultProviderLoader

All Implemented Interfaces:

Validateable, oracle.webdb.provider.v2.utils.soap.Initializable

public class DefaultProviderLoader
extends ProviderLoader
implements oracle.webdb.provider.v2.utils.soap.Initializable, Validateable

DefaultProviderLoader is the default implementation of a ProviderLoader, the entity responsible for loading and maintaining the integrity of a cached ProviderDefinition, and returning ProviderInstance objects associated with this definition.

DefaultProviderLoader makes use of the extensible DefaultNodeHandler mechanism to allow ProviderDefinitions to be loaded from XML files.

DefaultProviderLoader accepts a Map of String parameters in its init method. The table below summarizes the recognized parameters and their descriptions.

Parameter Name	Description
definition	Context root-relative path to XML provider definition file, e.g. "providers/sample/provider.xml"
debugLevel	Setting this to "2" will cause DefaultProviderLoader to dump parsed XML provider definitions to the servlet log file
showTestPage	Should the "test page" be displayed if the provider is accessed through its URL in a browser? Value should be either "true" or "false".

Constructor Summary

DefaultProviderLoader()

Method Summary

ProviderContext	getProviderContext() Gets the context object that describes the deployment environment of the provider type handled by this ProviderLoader.
ProviderInstance	getProviderInstance(java.lang.String providerId, boolean refresh) Returns a ProviderInstance object with the specified providerId, optionally permitting reload of the cached ProviderDefinition.
void	init(java.util.Map parameters) Initializes this DefaultProviderLoader.
void	validate(java.lang.String context, ValidationError errors) Validates the internal state of this DefaultProviderLoader before initiating validation calls on the tree of meta-data objects.

Methods inherited from class oracle.portal.provider.v2.ProviderLoader

getProviderInstance

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultProviderLoader

public DefaultProviderLoader()

Method Detail

init

public void init(java.util.Map parameters)
          throws ProviderException

Initializes this DefaultProviderLoader.

Specified by:

init in interface oracle.webdb.provider.v2.utils.soap.Initializable

Parameters:

parameters - a Map containing String parameters that will affect the ProviderContext that will be shared by all ProviderInstances created by this DefaultProviderLoader. See class description for more details.

Throws:

ProviderException - if an error occurs whilst trying to initialize.

getProviderContext

public ProviderContext getProviderContext()

Gets the context object that describes the deployment environment of the provider type handled by this ProviderLoader.

Specified by:

getProviderContext in class ProviderLoader

Returns:

context object describing the deployment environment of the provider.

getProviderInstance

public ProviderInstance getProviderInstance(java.lang.String providerId,
                                            boolean refresh)
                                     throws ProviderException

Returns a ProviderInstance object with the specified providerId, optionally permitting reload of the cached ProviderDefinition.

The first time this method is called, a new ProviderDefinition is loaded from its XML file and cached internally. This same cached ProviderDefinition is associated with all ProviderInstances returned by this method, unless it is called again when the refresh flag is true. If this is the case and the XML file has been updated, the method will replace the cached ProviderDefinition with a new version.

Specified by:

getProviderInstance in class ProviderLoader

Parameters:

providerId - the providerId of the ProviderInstance that is being requested.

refresh - flag indicating whether the ProviderDefinition should be reloaded or not. A value of true will cause a refresh.

Returns:

the ProviderInstance object with the specified providerId

Throws:

ProviderException

validate

public void validate(java.lang.String context,
                     ValidationError errors)

Validates the internal state of this DefaultProviderLoader before initiating validation calls on the tree of meta-data objects.

Specified by:

validate in interface Validateable

Parameters:

context - the calling context.

errors - current errors.