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package org.glassfish.jersey.message.filtering.spi;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.spi.Contract;
/**
* This contract brings support for transforming an internal representation of entity data filtering feature into an object
* familiar to underlying provider (e.g. message body worker).
* <p>
* This interface is supposed to be implemented by modules providing JAX-RS/Jersey providers / configuration object (e.g. message
* body workers) that can directly affect reading/writing of an entity.
* </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(MyObjectGraphTransformer.class)
* // FilteringGraphTransformer.
* .to(new TypeLiteral<ObjectGraphTransformer<MyFilteringObject>>() {})
* // Scope.
* .in(Singleton.class);
* </pre>
* The custom transformer can be then {@link javax.inject.Inject injected} as one these injection point types:
* <ul>
* <li>{@code MyObjectGraphTransformer}</li>
* <li>{@code javax.inject.Provider<ObjectGraphTransformer<MyFilteringObject>>}</li>
* </ul>
* </p>
* <p>
* By default a {@code ObjectGraph} -> {@code ObjectGraph} transformer is available in the runtime. This transformer can be
* injected (via {@link javax.inject.Inject @Inject}) into the following types:
* <ul>
* <li>{@code ObjectGraphTransformer}</li>
* <li>{@code javax.inject.Provider<ObjectGraphTransformer<Object>>}</li>
* <li>{@code javax.inject.Provider<ObjectGraphTransformer<ObjectGraph>>}</li>
* </ul>
* </p>
*
* @param <T> representation of entity data filtering requested by provider.
* @author Michal Gajdos
* @see AbstractObjectProvider
* @see ObjectProvider
*/
@Contract
public interface ObjectGraphTransformer<T> {
/**
* Transform a given graph into an entity-filtering object. The entire graph (incl. it's subgraphs) should be processed by
* this method as this method is invoked only once for a root entity class.
*
* @param graph object graph to be transformed.
* @return entity-filtering object requested by provider.
*/
public T transform(final ObjectGraph graph);
}