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package org.glassfish.jersey.server.internal.routing;

import javax.inject.Inject;
import javax.inject.Provider;

import org.glassfish.jersey.process.Inflector;
import org.glassfish.jersey.process.internal.Stage;
import org.glassfish.jersey.process.internal.Stages;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.ContainerResponse;

/**
 * Request pre-processing stage that {@link RoutingContext#getInflector() extracts
 * an inflector from a routing context} where it was previously stored by the
 * {@link RoutingStage request to resource matching stage} and
 * (if available) returns the inflector wrapped in a next terminal stage.
 *
 * This request pre-processing stage should be a final stage in the request
 * processing chain.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @see RoutingStage
 */
public class RoutedInflectorExtractorStage implements Stage<ContainerRequest> {
    private final Provider<RoutingContext> routingContextFactory;

    /**
     * Create new inflector extracting acceptor.
     *
     * @param routingContextFactory accepting context factory;
     */
    @Inject
    public RoutedInflectorExtractorStage(Provider<RoutingContext> routingContextFactory) {
        this.routingContextFactory = routingContextFactory;
    }

    @Override
    public Continuation<ContainerRequest> apply(final ContainerRequest requestContext) {
        final Inflector<ContainerRequest, ContainerResponse> inflector =
                routingContextFactory.get().getInflector();

        return inflector != null
                ? Continuation.of(requestContext, Stages.asStage(inflector))
                : Continuation.of(requestContext);
    }
}
