content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.ambari.server.api.query.render;
  
  import java.util.Set;
  
  import org.apache.ambari.server.api.query.QueryInfo;
  import org.apache.ambari.server.api.services.Request;
  import org.apache.ambari.server.api.services.Result;
  import org.apache.ambari.server.api.services.ResultPostProcessor;
  import org.apache.ambari.server.api.services.ResultPostProcessorImpl;
  import org.apache.ambari.server.api.util.TreeNode;
  import org.apache.ambari.server.api.util.TreeNodeImpl;
  
  /**
   * Default resource renderer.
   * Provides the default "native" rendering for all resources.
   */
  public class DefaultRenderer extends BaseRenderer implements Renderer {
  
    // ----- Renderer ----------------------------------------------------------
  
    @Override
    public TreeNode<Set<String>> finalizeProperties(
        TreeNode<QueryInfo> queryTree, boolean isCollection) {
  
      QueryInfo queryInfo = queryTree.getObject();
      TreeNode<Set<String>> resultTree = new TreeNodeImpl<>(
        null, queryInfo.getProperties(), queryTree.getName());
  
      copyPropertiesToResult(queryTree, resultTree);
  
      boolean addKeysToEmptyResource = true;
      if (! isCollection && isRequestWithNoProperties(queryTree)) {
        addSubResources(queryTree, resultTree);
        addKeysToEmptyResource = false;
      }
      ensureRequiredProperties(resultTree, addKeysToEmptyResource);
  
      return resultTree;
    }
  
    @Override
    public ResultPostProcessor getResultPostProcessor(Request request) {
      // simply return the native rendering
      return new ResultPostProcessorImpl(request);
    }
  
    @Override
    public Result finalizeResult(Result queryResult) {
      return queryResult;
    }
  }
  