| /** |
| * 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.services; |
| |
| import org.apache.ambari.server.api.resources.RequestResourceDefinition; |
| import org.apache.ambari.server.api.resources.ResourceDefinition; |
| import org.apache.ambari.server.api.resources.ResourceInstance; |
| import org.apache.ambari.server.controller.spi.Resource; |
| import org.apache.ambari.server.api.util.TreeNode; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Processes returned results to add href's and other content. |
| */ |
| public class ResultPostProcessorImpl implements ResultPostProcessor { |
| /** |
| * the associated request |
| */ |
| private Request m_request; |
| |
| /** |
| * Map of resource post processors keyed by resource type. |
| * These are used to act on specific resource types contained in the result. |
| */ |
| Map<Resource.Type, List<ResourceDefinition.PostProcessor>> |
| m_mapPostProcessors = new HashMap<Resource.Type, List<ResourceDefinition.PostProcessor>>(); |
| |
| |
| /** |
| * Constructor. |
| * |
| * @param request the associated request |
| */ |
| public ResultPostProcessorImpl(Request request) { |
| m_request = request; |
| |
| registerResourceProcessors(m_request.getResource()); |
| } |
| |
| @Override |
| public void process(Result result) { |
| processNode(result.getResultTree(), m_request.getURI()); |
| } |
| |
| /** |
| * Process a node of the result tree. Recursively calls child nodes. |
| * |
| * @param node the node to process |
| * @param href the current href |
| */ |
| private void processNode(TreeNode<Resource> node, String href) { |
| Resource r = node.getObject(); |
| if (r != null) { |
| List<ResourceDefinition.PostProcessor> listProcessors = |
| m_mapPostProcessors.get(r.getType()); |
| for (ResourceDefinition.PostProcessor processor : listProcessors) { |
| processor.process(m_request, node, href); |
| } |
| href = node.getProperty("href"); |
| int i = href.indexOf('?'); |
| if (i != -1) { |
| href = href.substring(0, i); |
| } |
| } else { |
| String isItemsCollection = node.getProperty("isCollection"); |
| if (node.getName() == null && "true".equals(isItemsCollection)) { |
| node.setName("items"); |
| node.setProperty("href", href); |
| } |
| } |
| for (TreeNode<Resource> child : node.getChildren()) { |
| processNode(child, href); |
| } |
| } |
| |
| /** |
| * Registers the resource processors. |
| * Recursively registers child resource processors. |
| * |
| * @param resource the root resource |
| */ |
| private void registerResourceProcessors(ResourceInstance resource) { |
| //todo: reconsider registration mechanism |
| Resource.Type type = resource.getResourceDefinition().getType(); |
| List<ResourceDefinition.PostProcessor> listProcessors = m_mapPostProcessors.get(type); |
| if (listProcessors == null) { |
| listProcessors = new ArrayList<ResourceDefinition.PostProcessor>(); |
| m_mapPostProcessors.put(type, listProcessors); |
| } |
| listProcessors.addAll(resource.getResourceDefinition().getPostProcessors()); |
| |
| for (ResourceInstance child : resource.getSubResources().values()) { |
| // avoid cycle |
| if (!m_mapPostProcessors.containsKey(child.getResourceDefinition().getType())) { |
| registerResourceProcessors(child); |
| } |
| } |
| |
| // always add Request post processors since they may be returned but will not be a child |
| m_mapPostProcessors.put(Resource.Type.Request, new RequestResourceDefinition().getPostProcessors()); |
| } |
| |
| } |