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.resources;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.ambari.server.api.services.Request;
  import org.apache.ambari.server.api.util.TreeNode;
  import org.apache.ambari.server.controller.internal.ResourceImpl;
  import org.apache.ambari.server.controller.spi.Resource;
  
  public class StackVersionResourceDefinition extends BaseResourceDefinition {
  
    public StackVersionResourceDefinition() {
      super(Resource.Type.StackVersion);
    }
  
    @Override
    public String getPluralName() {
      return "versions";
    }
  
    @Override
    public String getSingularName() {
      return "version";
    }
  
    @Override
    public Set<SubResourceDefinition> getSubResourceDefinitions() {
  
      Set<SubResourceDefinition> children = new HashSet<>();
  
      children.add(new SubResourceDefinition(Resource.Type.OperatingSystem));
      children.add(new SubResourceDefinition(Resource.Type.StackService));
      children.add(new SubResourceDefinition(Resource.Type.StackLevelConfiguration));
      children.add(new SubResourceDefinition(Resource.Type.RepositoryVersion));
      children.add(new SubResourceDefinition(Resource.Type.StackArtifact));
      children.add(new SubResourceDefinition(Resource.Type.CompatibleRepositoryVersion));
      children.add(new SubResourceDefinition(Resource.Type.Mpack, null, false));
      return children;
    }
  
    @Override
    public List<PostProcessor> getPostProcessors() {
      List<PostProcessor> listProcessors = new ArrayList<>();
      listProcessors.add(new StackVersionHrefProcessor());
      listProcessors.add(new StackVersionPostProcessor());
      return listProcessors;
    }
  
    /**
     * Post Processing the mpack href when the call comes from stack endpoint to ensure that the
     * href is a backreference to the mpacks end point
     */
    private class StackVersionHrefProcessor extends BaseHrefPostProcessor {
      @Override
      public void process(Request request, TreeNode<Resource> resultNode, String href) {
        if (href.contains("/mpacks/")) {
          ResourceImpl mpack = (ResourceImpl) resultNode.getObject();
          Map<String, Map<String, Object>> mapInfo = mpack.getPropertiesMap();
          Map<String, Object> versionInfo = mapInfo.get("Versions");
  
          int idx = href.indexOf("mpacks/");
          String stackName = (String)versionInfo.get("stack_name");
          String stackVersion = (String)versionInfo.get("stack_version");
          href = href.substring(0, idx) + "stacks/" + stackName + "/versions/" + stackVersion;
          resultNode.setProperty("href", href);
        } else {
          super.process(request, resultNode, href);
        }
      }
    }
  
    /***
     * Post processing to change the name of the result node to stack
     */
    private class StackVersionPostProcessor implements PostProcessor {
      @Override
      public void process(Request request, TreeNode<Resource> resultNode, String href) {
        if (href.contains("/mpacks/")) {
          resultNode.setName("stack");
        }
      }
    }
  
   }
  