content: /*
   * Copyright 2022 Alibaba Group Holding Limited.
   *
   * 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.graphscope.utils;
  
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  
  public class GenericUtils {
      public static <T> Class<?>[] getTypeArgumentFromInterface(Class<? extends T> childClass) {
          Type type = childClass.getGenericInterfaces()[0];
          Class<?>[] classes;
          if (type instanceof ParameterizedType) {
              ParameterizedType parameterizedType = (ParameterizedType) type;
              Type[] typeParams = parameterizedType.getActualTypeArguments();
              classes = new Class<?>[typeParams.length];
              for (int i = 0; i < typeParams.length; ++i) {
                  classes[i] = (Class<?>) typeParams[i];
              }
              return classes;
          } else {
              throw new IllegalStateException("Not a parameterized type");
          }
      }
  }
  