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package org.glassfish.jersey;

import javax.ws.rs.core.FeatureContext;
import javax.ws.rs.ext.ReaderInterceptorContext;
import javax.ws.rs.ext.WriterInterceptorContext;

import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.inject.ServiceLocatorSupplier;

import org.glassfish.hk2.api.ServiceLocator;

/**
 * Utility class with static methods that extract {@link org.glassfish.hk2.api.ServiceLocator service locator}
 * from various JAX-RS components. This class can be used when no injection is possible by
 * {@link javax.ws.rs.core.Context} or {@link javax.inject.Inject} annotation due to character of
 * provider but there is a need to get any service from {@link org.glassfish.hk2.api.ServiceLocator}.
 * 

* Injections are not possible for example when a provider is registered as an instance on the client. * In this case the runtime will not inject the instance as this instance might be used in other client * runtimes too. *

*

* Example. This is the class using a standard injection: *

 *     public static class MyWriterInterceptor implements WriterInterceptor {
 *         @Inject
 *         MyInjectedService service;
 *
 *         @Override
 *         public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException {
 *             Something something = service.getSomething();
 *             ...
 *         }
 *
 *     }
 * 
*

*

* If this injection is not possible then this construct can be used: *

 *     public static class MyWriterInterceptor implements WriterInterceptor {
 *
 *         @Override
 *         public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException {
 *             final ServiceLocator serviceLocator = ServiceLocatorProvider.getServiceLocator(context);
 *             final MyInjectedService service = serviceLocator.getService(MyInjectedService.class);
 *             Something something = service.getSomething();
 *             ...
 *         }
 *     }
 * 
*

*

* Note, that this injection support is intended mostly for injection of custom user types. JAX-RS types * are usually available without need for injections in method parameters. However, when injection of custom * type is needed it is preferred to use standard injections if it is possible rather than injection support * provided by this class. *

*

* User returned {@code ServiceLocator} only for purpose of getting services (do not change the state of the locator). *

* * * @author Miroslav Fuksa * * @since 2.6 */ public class ServiceLocatorProvider { /** * Extract and return service locator from {@link javax.ws.rs.ext.WriterInterceptorContext writerInterceptorContext}. * The method can be used to inject custom types into a {@link javax.ws.rs.ext.WriterInterceptor}. * * @param writerInterceptorContext Writer interceptor context. * * @return Service locator. * * @throws java.lang.IllegalArgumentException when {@code writerInterceptorContext} is not a default * Jersey implementation provided by Jersey as argument in the * {@link javax.ws.rs.ext.WriterInterceptor#aroundWriteTo(javax.ws.rs.ext.WriterInterceptorContext)} method. */ public static ServiceLocator getServiceLocator(WriterInterceptorContext writerInterceptorContext) { if (!(writerInterceptorContext instanceof ServiceLocatorSupplier)) { throw new IllegalArgumentException( LocalizationMessages.ERROR_SERVICE_LOCATOR_PROVIDER_INSTANCE_FEATURE_WRITER_INTERCEPTOR_CONTEXT( writerInterceptorContext.getClass().getName())); } return ((ServiceLocatorSupplier) writerInterceptorContext).getServiceLocator(); } /** * Extract and return service locator from {@link javax.ws.rs.ext.ReaderInterceptorContext readerInterceptorContext}. * The method can be used to inject custom types into a {@link javax.ws.rs.ext.ReaderInterceptor}. * * @param readerInterceptorContext Reader interceptor context. * * @return Service locator. * * @throws java.lang.IllegalArgumentException when {@code readerInterceptorContext} is not a default * Jersey implementation provided by Jersey as argument in the * {@link javax.ws.rs.ext.ReaderInterceptor#aroundReadFrom(javax.ws.rs.ext.ReaderInterceptorContext)} method. */ public static ServiceLocator getServiceLocator(ReaderInterceptorContext readerInterceptorContext) { if (!(readerInterceptorContext instanceof ServiceLocatorSupplier)) { throw new IllegalArgumentException( LocalizationMessages.ERROR_SERVICE_LOCATOR_PROVIDER_INSTANCE_FEATURE_READER_INTERCEPTOR_CONTEXT( readerInterceptorContext.getClass().getName())); } return ((ServiceLocatorSupplier) readerInterceptorContext).getServiceLocator(); } /** * Extract and return service locator from {@link javax.ws.rs.core.FeatureContext featureContext}. * The method can be used to inject custom types into a {@link javax.ws.rs.core.Feature}. *

* Note that features are utilized during initialization phase when not all providers are registered yet. * It is undefined which injections are already available in this phase. *

* * @param featureContext Feature context. * * @return Service locator. * * @throws java.lang.IllegalArgumentException when {@code writerInterceptorContext} is not a default * Jersey instance provided by Jersey * in {@link javax.ws.rs.core.Feature#configure(javax.ws.rs.core.FeatureContext)} method. */ public static ServiceLocator getServiceLocator(FeatureContext featureContext) { if (!(featureContext instanceof ServiceLocatorSupplier)) { throw new IllegalArgumentException( LocalizationMessages.ERROR_SERVICE_LOCATOR_PROVIDER_INSTANCE_FEATURE_CONTEXT( featureContext.getClass().getName())); } return ((ServiceLocatorSupplier) featureContext).getServiceLocator(); } }




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