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package org.glassfish.jersey.message.filtering.spi;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.spi.Contract;
/**
* Entry point of Entity Data Filtering feature for providers working with custom entities and media types (reading/writing).
* Exposed methods are supposed to provide an entity-filtering object of defined type (generic parameter type
* {@code <T>}) for given types/classes that is requested by underlying provider (e.g. message body worker).
* <p>
* Methods are also accepting a list of entity annotations which entity-filtering scopes and then particular entity-filtering
* object are determined from. Entity annotations can be passed to the runtime via:
* <ul>
* <li>{@link javax.ws.rs.client.Entity#entity(Object, javax.ws.rs.core.MediaType, java.lang.annotation.Annotation[])} on the
* client, or</li>
* <li>{@link javax.ws.rs.core.Response.ResponseBuilder#entity(Object, java.lang.annotation.Annotation[])} on the server</li>
* </ul>
* </p>
* <p>
* Custom implementations should, during processing, look up for available {@link EntityProcessor entity processors} to examine
* given entity classes and {@link ScopeResolver scope providers} to determine the current entity-filtering scope. Entity class
* and entity-filtering scopes determine the {@link ObjectGraph object graph} passed to {@link ObjectGraphTransformer object graph
* transformer} and hence the resulting entity-filtering object.
* </p>
* <p>
* Implementations should be registered into client/server runtime via
* {@link AbstractBinder jersey binder} (for more information and common implementation see
* {@link AbstractObjectProvider}):
* <pre>
* bindAsContract(MyObjectProvider.class)
* // FilteringGraphTransformer.
* .to(new TypeLiteral<ObjectGraphTransformer<MyFilteringObject>>() {})
* // Scope.
* .in(Singleton.class);
* </pre>
* The custom provider can be then {@link javax.inject.Inject injected} as one these injection point types:
* <ul>
* <li>{@code MyObjectProvider}</li>
* <li>{@code javax.inject.Provider<ObjectProvider<MyFilteringObject>>}</li>
* </ul>
* </p>
* <p>
* By default a {@code ObjectGraph} provider is available in the runtime. This object provider can be injected (via
* {@link javax.inject.Inject @Inject}) into the following types:
* <ul>
* <li>{@code ObjectProvider}</li>
* <li>{@code javax.inject.Provider<ObjectProvider<Object>>}</li>
* <li>{@code javax.inject.Provider<ObjectProvider<ObjectGraph>>}</li>
* </ul>
* </p>
* <p>
* Note: For most of the cases it is sufficient that users implement {@link ObjectGraphTransformer object graph transformer} by
* extending {@link AbstractObjectProvider} class.
* </p>
*
* @param <T> representation of entity data filtering requested by provider.
* @author Michal Gajdos
* @see AbstractObjectProvider
* @see ObjectGraphTransformer
*/
@Contract
public interface ObjectProvider<T> {
/**
* Get reader/writer entity-filtering object for given type.
*
* @param genericType type for which the object is requested.
* @param forWriter flag to determine whether to create object for reading/writing purposes.
* @param annotations entity annotations to determine the runtime scope.
* @return entity-filtering object.
*/
public T getFilteringObject(Type genericType, boolean forWriter, final Annotation... annotations);
}