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

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

import org.glassfish.jersey.internal.util.collection.Ref;
import org.glassfish.jersey.server.spi.RequestScopedInitializer;

import org.glassfish.hk2.api.ServiceLocator;

import jersey.repackaged.com.google.common.base.Function;

/**
 * Request/response scoped injection support initialization stage.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public final class ReferencesInitializer implements Function<RequestProcessingContext, RequestProcessingContext> {

    private final ServiceLocator locator;
    private final Provider<Ref<RequestProcessingContext>> processingContextRefProvider;

    /**
     * Injection constructor.
     *
     * @param locator application service locator.
     * @param processingContextRefProvider container request reference provider (request-scoped).
     */
    @Inject
    ReferencesInitializer(
            final ServiceLocator locator,
            final Provider<Ref<RequestProcessingContext>> processingContextRefProvider) {
        this.locator = locator;
        this.processingContextRefProvider = processingContextRefProvider;
    }

    /**
     * Initialize the request references using the incoming request processing context.
     *
     * @param context incoming request context.
     * @return same (unmodified) request context.
     */
    @Override
    public RequestProcessingContext apply(final RequestProcessingContext context) {
        processingContextRefProvider.get().set(context);

        final RequestScopedInitializer requestScopedInitializer = context.request().getRequestScopedInitializer();
        if (requestScopedInitializer != null) {
            requestScopedInitializer.initialize(locator);
        }

        return context;
    }
}
