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A simple but powerful web server framework
There is a newer version: 2.0.3
package io.muserver.rest;

import io.muserver.MuException;

import javax.ws.rs.core.*;
import javax.ws.rs.ext.RuntimeDelegate;
import javax.ws.rs.sse.Sse;
import java.util.HashMap;
import java.util.Map;

/**
 * The JAX-RS runtime delegate for mu-server.
 * In most cases this class should not be used, however in cases where you want to test JaxRS classes outside of
 * mu-server you may need to make sure a JAX-RS RuntimeDelegate is set, in which case you can call {@link #ensureSet()}.
 */
public class MuRuntimeDelegate extends RuntimeDelegate {

    private static MuRuntimeDelegate singleton;

    /**
     * Registers the mu RuntimeDelegate with jax-rs, if it was not already.
     * @return Returns the runtime delegate.
     */
    public static synchronized RuntimeDelegate ensureSet() {
        if (singleton == null) {
            singleton = new MuRuntimeDelegate();
            RuntimeDelegate.setInstance(singleton);
        }
        return singleton;
    }

    private final Map, HeaderDelegate> headerDelegates = new HashMap<>();

    private MuRuntimeDelegate() {
        headerDelegates.put(MediaType.class, new MediaTypeHeaderDelegate());
        headerDelegates.put(CacheControl.class, new CacheControlHeaderDelegate());
        headerDelegates.put(NewCookie.class, new NewCookieHeaderDelegate());
        headerDelegates.put(Cookie.class, new CookieHeaderDelegate());
        headerDelegates.put(EntityTag.class, new EntityTagDelegate());
        headerDelegates.put(Link.class, new LinkHeaderDelegate());
    }

    @Override
    public UriBuilder createUriBuilder() {
        return new MuUriBuilder();
    }

    @Override
    public Response.ResponseBuilder createResponseBuilder() {
        return new JaxRSResponse.Builder();
    }

    @Override
    public Variant.VariantListBuilder createVariantListBuilder() {
        throw NotImplementedException.notYet();
    }

    @Override
    public  T createEndpoint(Application application, Class endpointType) throws IllegalArgumentException, UnsupportedOperationException {
        throw new MuException("MuServer does not support instantiation of application classes");
    }

    @Override
    @SuppressWarnings("unchecked")
    public  HeaderDelegate createHeaderDelegate(Class type) throws IllegalArgumentException {
        HeaderDelegate headerDelegate = headerDelegates.get(type);
        if (headerDelegate != null) {
            return (HeaderDelegate) headerDelegate;
        }
        throw new MuException("MuServer does not support converting " + type.getName());
    }

    @Override
    public Link.Builder createLinkBuilder() {
        return new LinkHeaderDelegate.MuLinkBuilder();
    }

    /**
     * Creates a new SSE interface that can create SSE Events and Broadcasters.
     * This can be useful if you want to have a singleton broadcaster in your class that you can declare as a final field.
     * @return A broadcaster that can be used to publish SSE events to clients.
     */
    public static Sse createSseFactory() {
        return new JaxSseImpl();
    }
}