code: /*
   * 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.skywalking.oap.server.library.module;
  
  import java.util.HashMap;
  import java.util.Properties;
  
  /**
   * Modulization configurations. The {@link ModuleManager} is going to start, lookup, start modules based on this.
   */
  public class ApplicationConfiguration {
      private HashMap<String, ModuleConfiguration> modules = new HashMap<>();
  
      public String[] moduleList() {
          return modules.keySet().toArray(new String[0]);
      }
  
      public ModuleConfiguration addModule(String moduleName) {
          ModuleConfiguration newModule = new ModuleConfiguration();
          modules.put(moduleName, newModule);
          return newModule;
      }
  
      public boolean has(String moduleName) {
          return modules.containsKey(moduleName);
      }
  
      public ModuleConfiguration getModuleConfiguration(String name) {
          return modules.get(name);
      }
  
      /**
       * The configurations about a certain module.
       */
      public static class ModuleConfiguration {
          private HashMap<String, ProviderConfiguration> providers = new HashMap<>();
  
          private ModuleConfiguration() {
          }
  
          public Properties getProviderConfiguration(String name) {
              return providers.get(name).getProperties();
          }
  
          public boolean has(String name) {
              return providers.containsKey(name);
          }
  
          public ModuleConfiguration addProviderConfiguration(String name, Properties properties) {
              ProviderConfiguration newProvider = new ProviderConfiguration(properties);
              providers.put(name, newProvider);
              return this;
          }
      }
  
      /**
       * The configuration about a certain provider of a module.
       */
      public static class ProviderConfiguration {
          private Properties properties;
  
          ProviderConfiguration(Properties properties) {
              this.properties = properties;
          }
  
          private Properties getProperties() {
              return properties;
          }
      }
  }
  