content: package act.test.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2018 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import com.alibaba.fastjson.JSONArray;
  import com.alibaba.fastjson.JSONObject;
  import org.osgl.util.C;
  import org.osgl.util.S;
  
  import java.util.List;
  
  public class JSONTraverser {
  
      private JSONObject obj;
      private JSONArray array;
  
      public JSONTraverser(Object o) {
          if (o instanceof JSONObject) {
              obj = (JSONObject) o;
          } else if (o instanceof JSONArray) {
              array = (JSONArray) o;
          } else {
              throw new IllegalArgumentException();
          }
      }
  
      public Object traverse(String path) {
          String[] sa = path.split("[\\.\\[\\]]+");
          if (sa.length == 1) {
              if (obj != null) {
                  return obj.get(path);
              } else {
                  return array.get(Integer.parseInt(path));
              }
          }
          List<String> list = C.newListOf(sa);
          String first = list.remove(0);
          if ("".equalsIgnoreCase(first)) {
              first = list.remove(0);
          }
          Object o = traverse(first);
          JSONTraverser traverser = new JSONTraverser(o);
          String rest = S.join(list).by(".").get();
          return traverser.traverse(rest);
      }
  
  
      public static Object traverse(Object obj, String path) {
          return new JSONTraverser(obj).traverse(path);
      }
  
  }
  