content: /*
   * Copyright 1999-2021 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.nacos.sys.utils;
  
  import org.springframework.boot.context.properties.bind.Bindable;
  import org.springframework.boot.context.properties.bind.Binder;
  import org.springframework.core.env.Environment;
  
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * Properties util.
   *
   * @author xiweng.yy
   */
  public class PropertiesUtil {
      
      public static Properties getPropertiesWithPrefix(Environment environment, String prefix) {
          return handleSpringBinder(environment, prefix, Properties.class);
      }
      
      public static Map<String, Object> getPropertiesWithPrefixForMap(Environment environment, String prefix) {
          return handleSpringBinder(environment, prefix, Map.class);
      }
      
      /**
       * Handle spring binder to bind object.
       *
       * @param environment spring environment
       * @param prefix      properties prefix
       * @param targetClass target class
       * @param <T>         target class
       * @return binder object
       */
      public static <T> T handleSpringBinder(Environment environment, String prefix, Class<T> targetClass) {
          String prefixParam = prefix.endsWith(".") ? prefix.substring(0, prefix.length() - 1) : prefix;
          return Binder.get(environment).bind(prefixParam, Bindable.of(targetClass)).orElse(null);
      }
  }
  