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 com.alibaba.jstorm;
  
  import org.yaml.snakeyaml.Yaml;
  
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.InputStream;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  public class LoadConfig {
      public static final String TOPOLOGY_TYPE = "topology.type";
  
      private static Map LoadProperty(String prop) {
          Map ret = null;
          Properties properties = new Properties();
  
          try {
              InputStream stream = new FileInputStream(prop);
              properties.load(stream);
              ret = new HashMap<Object, Object>();
              ret.putAll(properties);
          } catch (FileNotFoundException e) {
              System.out.println("No such file " + prop);
          } catch (Exception e1) {
              e1.printStackTrace();
          }
  
          return ret;
      }
  
      private static Map LoadYaml(String confPath) {
          Map ret = null;
          Yaml yaml = new Yaml();
  
          try {
              InputStream stream = new FileInputStream(confPath);
  
              ret = (Map) yaml.load(stream);
              if (ret == null || ret.isEmpty() == true) {
                  throw new RuntimeException("Failed to read config file");
              }
  
          } catch (FileNotFoundException e) {
              System.out.println("No such file " + confPath);
              throw new RuntimeException("No config file");
          } catch (Exception e1) {
              e1.printStackTrace();
              throw new RuntimeException("Failed to read config file");
          }
  
          return ret;
      }
  
      public static Map LoadConf(String arg) {
          Map ret = null;
  
          if (arg.endsWith("yaml")) {
              ret = LoadYaml(arg);
          } else {
              ret = LoadProperty(arg);
          }
  
          return ret;
      }
  }