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package org.jboss.resteasy.spi;

import org.jboss.resteasy.core.Dispatcher;
import org.jboss.resteasy.mock.MockHttpRequest;
import org.jboss.resteasy.mock.MockHttpResponse;

import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import java.net.URI;

import static org.jboss.resteasy.spi.ResteasyProviderFactory.getContextData;

/**
 * 
 * InternalDispatch represents a "forward" in servlet terms. You can perform an
 * internal GET/POST/DELETE/PUT using IntenalDispatch using Java Object. For
 * example:
 * 
 *  * @GET
 * @Produces("text/plain")
 * @Path("/forward/object")
 * public SomeObject forward(@Context InternalDispatcher dispatcher)
 * {
 *    return (SomeObject) dispatcher.getEntity("/some-object");
 * }
 * 
 * 
 * That previous snippet performs an internal request to /some-object and
 * returns the Object representation of the Resource that lives at
 * "/some-object".
 * 
 *
 * @author Solomon Duskis
 * @version $Revision: 1 $
 */

public class InternalDispatcher
{

   private static InternalDispatcher instance = new InternalDispatcher();

   // using a singleton so that that end users can override this behavior
   public static InternalDispatcher getInstance()
   {
      return instance;
   }

   public static void setInstance(InternalDispatcher instance)
   {
      InternalDispatcher.instance = instance;
   }

   public Object getEntity(String uri)
   {
      return getResponse(uri).getEntity();
   }

   public Response delete(String uri)
   {
      return getResponse(createRequest(uri, "DELETE"));
   }

   public Response putEntity(String uri, String contentType, Object entity)
   {
      return executeEntity("PUT", uri, contentType, entity);

   }

   public Response putEntity(String uri, Object entity)
   {
      return putEntity(uri, "*/*", entity);
   }

   public Response executeEntity(String method, String uri, String contentType, Object entity)
   {
      MockHttpRequest post = createRequest(uri, method);
      post.contentType(contentType);
      return getResponse(post, entity);
   }

   public Response postEntity(String uri, String contentType, Object entity)
   {
      return executeEntity("POST", uri, contentType, entity);
   }

   public Response postEntity(String uri, Object entity)
   {
      return postEntity(uri, "*/*", entity);
   }

   public Response getResponse(String uri)
   {
      return getResponse(createRequest(uri, "GET"));
   }

   public Response getResponse(MockHttpRequest request)
   {
      return getResponse(request, null);
   }

   public Response getResponse(MockHttpRequest request, Object entity)
   {
      try
      {
         Dispatcher dispatcher = getContextData(Dispatcher.class);
         if (dispatcher == null)
         {
            return null;
         }
         enhanceRequest(request);
         return dispatcher.internalInvocation(request, new MockHttpResponse(), entity);
      }
      finally
      {
      }

   }

   protected void enhanceRequest(MockHttpRequest request)
   {
      HttpRequest previousRequest = getContextData(HttpRequest.class);
      if (previousRequest != null)
      {
         getHeaders(request).putAll(getHeaders(previousRequest));
      }
   }

   private MultivaluedMap getHeaders(HttpRequest request)
   {
      return request.getHttpHeaders().getRequestHeaders();
   }

   public static MockHttpRequest createRequest(String relativeUri, String verb)
   {
      UriInfo uriInfo = ResteasyProviderFactory.getContextData(UriInfo.class);

      URI baseUri = uriInfo.getBaseUri();
      URI absoluteUri = baseUri.resolve(parseRelativeUri(relativeUri));
      return MockHttpRequest.create(verb, absoluteUri, baseUri);
   }

   private static URI parseRelativeUri(String relativeUri) {
      if(relativeUri.startsWith("/")) {
         return URI.create(relativeUri.substring(1));
      }
      return URI.create(relativeUri);
   }
}