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Pegasus is a framework for building robust, scalable service architectures using dynamic discovery and simple asychronous type-checked REST + JSON APIs.

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/*
   Copyright (c) 2012 LinkedIn Corp.

   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.linkedin.restli.internal.server.methods.response;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;

import com.linkedin.data.DataMap;
import com.linkedin.data.template.RecordTemplate;
import com.linkedin.r2.message.rest.RestRequest;
import com.linkedin.restli.common.BatchResponse;
import com.linkedin.restli.internal.server.RoutingResult;
import com.linkedin.restli.internal.server.ServerResourceContext;
import com.linkedin.restli.internal.server.methods.AnyRecord;
import com.linkedin.restli.internal.server.util.RestUtils;
import com.linkedin.restli.server.BatchResult;
import com.linkedin.restli.server.ResourceContext;
import com.linkedin.restli.server.RestLiServiceException;

public class BatchGetResponseBuilder extends AbstractBatchResponseBuilder implements
    RestLiResponseBuilder
{
  public BatchGetResponseBuilder(ErrorResponseBuilder errorResponseBuilder)
  {
    super(errorResponseBuilder);
  }

  @Override
  public PartialRestResponse buildResponse(final RestRequest request,
                                           final RoutingResult routingResult,
                                           final Object object,
                                           final Map headers)
      throws IOException
  {
    @SuppressWarnings({ "unchecked" })
    /** constrained by signature of {@link com.linkedin.restli.server.resources.CollectionResource#batchGet(java.util.Set)} */
    Map map = (Map)object;
    Map errorMap = Collections.emptyMap();

    if (object instanceof BatchResult)
    {
      @SuppressWarnings({"unchecked"})
      /** constrained by signature of {@link com.linkedin.restli.server.resources.CollectionResource#batchGet(java.util.Set)} */
      BatchResult batchResult =
          (BatchResult) object;
      errorMap = batchResult.getErrors();
    }

    int numErrors =
        errorMap.size()
            + ((ServerResourceContext) routingResult.getContext()).getBatchKeyErrors()
                                                                  .size();

    Class valueClass =
        routingResult.getResourceMethod().getResourceModel().getValueClass();

    BatchResponse batchResponse =
        createBatchResponse(AnyRecord.class, map.size(), numErrors);

    populateResults(batchResponse,
                    map,
                    headers,
                    valueClass,
                    routingResult.getContext());

    populateErrors(request,
                   routingResult,
                   errorMap,
                   headers,
                   batchResponse);

    return new PartialRestResponse(batchResponse);
  }

  @Override
  protected DataMap buildResultRecord(final RecordTemplate o,
                                      final ResourceContext resourceContext)
  {
    DataMap data = RestUtils.projectFields(o.data(), resourceContext);
    return data;
  }
}