/*
* Copyright (C) 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.greaze.server.dispatcher;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.common.base.Preconditions;
import com.google.greaze.definition.CallPath;
import com.google.greaze.definition.HeaderMap;
import com.google.greaze.definition.HeaderMapSpec;
import com.google.greaze.definition.rest.WebContext;
import com.google.greaze.definition.rest.WebContextSpec;
import com.google.greaze.definition.rest.query.ResourceQueryBase;
import com.google.greaze.definition.rest.query.ResourceQueryParams;
import com.google.greaze.definition.rest.query.ResourceQueryUtils;
import com.google.greaze.definition.webservice.RequestSpec;
import com.google.greaze.definition.webservice.ResponseBody;
import com.google.greaze.definition.webservice.ResponseBodyGsonTypeAdapterFactory;
import com.google.greaze.definition.webservice.ResponseBodySpec;
import com.google.greaze.definition.webservice.WebServiceCallSpec;
import com.google.greaze.definition.webservice.WebServiceRequest;
import com.google.greaze.definition.webservice.WebServiceResponse;
import com.google.greaze.server.internal.utils.WebContextExtractor;
import com.google.greaze.webservice.server.RequestReceiver;
import com.google.greaze.webservice.server.ResponseSender;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.inject.Provider;
/**
* A class to service incoming resource query requests using corresponding query handlers.
*
* @author Inderjeet Singh
*/
public class ResourceQueryDispatcher {
protected final Provider<GsonBuilder> gsonBuilder;
public ResourceQueryDispatcher(Provider<GsonBuilder> gsonBuilder) {
this.gsonBuilder = gsonBuilder;
}
@SuppressWarnings({"rawtypes", "unchecked"})
public void service(HttpServletRequest req, HttpServletResponse res,
String queryName, CallPath callPath, ResourceQueryBase resourceQuery) {
Preconditions.checkNotNull(resourceQuery);
WebContextSpec webContextSpec = resourceQuery.getWebContextSpec();
WebServiceCallSpec spec = ResourceQueryUtils.generateCallSpec(callPath,
resourceQuery.getResourceType(), resourceQuery.getQueryType(),
webContextSpec);
RequestSpec requestSpec = spec.getRequestSpec();
RequestReceiver requestReceiver = new RequestReceiver(gsonBuilder.get(), requestSpec);
WebServiceRequest webServiceRequest = requestReceiver.receive(req);
ResourceQueryParams queryParams =
(ResourceQueryParams) webServiceRequest.getUrlParameters().getParamsObject();
WebContext context = new WebContextExtractor(webContextSpec).extract(webServiceRequest.getHeaders());
List results = resourceQuery.query(queryParams, context);
HeaderMapSpec headerSpec = new HeaderMapSpec.Builder().build();
HeaderMap responseHeaders = new HeaderMap.Builder(headerSpec).build();
ResponseBodySpec bodySpec = new ResponseBodySpec.Builder()
.setListBody(resourceQuery.getResourceType())
.build();
ResponseBody responseBody = new ResponseBody.Builder(bodySpec)
.setListBody(results)
.build();
WebServiceResponse response = new WebServiceResponse(responseHeaders, responseBody);
Gson gson = gsonBuilder.get()
.registerTypeAdapterFactory(new ResponseBodyGsonTypeAdapterFactory(bodySpec))
.create();
ResponseSender responseSender = new ResponseSender(gson);
responseSender.send(res, response);
}
public void service(HttpServletRequest req, HttpServletResponse res, String queryName,
CallPath callPath) {
}
}