content: /*
   * Copyright 1999-2018 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.core.utils;
  
  import com.alibaba.nacos.common.utils.Preconditions;
  
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.lang.reflect.TypeVariable;
  
  /**
   * Encapsulates third party tools for generics acquisition.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public class GenericType<T> {
      
      private static final long serialVersionUID = -2103808581228167629L;
      
      private final Type runtimeType;
      
      final Type capture() {
          Type superclass = getClass().getGenericSuperclass();
          Preconditions.checkArgument(superclass instanceof ParameterizedType, "%s isn't parameterized", superclass);
          return ((ParameterizedType) superclass).getActualTypeArguments()[0];
      }
      
      protected GenericType() {
          this.runtimeType = capture();
          if (runtimeType instanceof TypeVariable) {
              throw new IllegalArgumentException("runtimeType must be ParameterizedType Class");
          }
      }
      
      /**
       * Returns the represented type.
       */
      public final Type getType() {
          return runtimeType;
      }
  }
  