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## org.eclipse.gemini.blueprint.extender
Interface OsgiApplicationContextCreator

All Known Implementing Classes:
  ConditionalApplicationContextCreator, DefaultOsgiApplicationContextCreator

    public interface OsgiApplicationContextCreator

Extender hook for customizing the OSGi application context creation. Each bundle started by the OSGi platform can create (or customize) an application context that becomes managed by the Spring-DM extender. For example, to create an application context based on the presence of a manifest header, one could use the following code:

     class HeaderBasedAppCtxCreator implements
     OsgiApplicationContextCreator {

     /** location header */ private static final String HEADER =
     "Context-Locations";

     public DelegatedExecutionOsgiBundleApplicationContext
     createApplicationContext(BundleContext bundleContext) { Bundle owningBundle =
     bundleContext.getBundle();

     Object value = owningBundle.getHeaders().get(HEADER); String[] locations =
     null; if (value != null && value instanceof String) { locations =
     StringUtils.commaDelimitedListToStringArray((String) value); } else {
     locations = <default values> }

     // create application context from 'locations'

     return applicationContext; } }

Note: The application contexts should be only created and initialized but not started (i.e. `refresh()` method should not be called).

The recommended way of configuring the extender is to attach any relevant `OsgiApplicationContextCreator` implementation as fragments to extender bundle. Please see the OSGi specification and Spring-DM reference documentation for more information on how to do that.

Note the extender also supports `OsgiBeanFactoryPostProcessor` for application context customization.

The creation of an application context doesn't guarantee that a bundle becomes Spring-DM managed. The Spring-DM extender can do additional post filtering that can discard the bundle (and associated context).

Author:
  Costin Leau

Method Summary
`DelegatedExecutionOsgiBundleApplicationContext` | `createApplicationContext(BundleContext bundleContext)` Creates an application context for the given bundle context.

Method Detail

### createApplicationContext

    DelegatedExecutionOsgiBundleApplicationContext createApplicationContext(BundleContext bundleContext)
                                                                            throws Exception

  Creates an application context for the given bundle context. If no application context needs to be created, then `null` should be returned. Exceptions will be caught and logged but will not prevent the creation of other application contexts.

  Parameters:
    `bundleContext` - OSGi bundle context determining the context creation
  Returns:
    `null` if no context should be created, non- `null` otherwise
  Throws:
    `Exception` - if something goes wrong

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