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 org.apache.cassandra.tools;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Modifier;
  
  import org.apache.cassandra.utils.ReflectionUtils;
  
  public class FieldUtil
  {
      public static void setInstanceUnsafe(Class<?> klass, Object v, String fieldName)
      {
          try
          {
              setInstanceUnsafeThrowing(klass, v, fieldName);
          }
          catch (Throwable e)
          {
              throw new RuntimeException(e);
          }
      }
  
      private static void setInstanceUnsafeThrowing(Class<?> klass, Object v, String fieldName) throws Throwable
      {
          Field field = ReflectionUtils.getField(klass, fieldName);
          field.setAccessible(true);
  
          Field modifiers = ReflectionUtils.getModifiersField();
          modifiers.setAccessible(true);
          modifiers.setInt(field, field.getModifiers() & ~Modifier.FINAL);
  
          field.set(null, v);
      }
  
      public static void transferFields(Object sourceInstance, Class<?> klass)
      {
          for (Field sourceField : sourceInstance.getClass().getDeclaredFields())
          {
              sourceField.setAccessible(true);
              try
              {
                  setInstanceUnsafe(klass, sourceField.get(sourceInstance), sourceField.getName());
              }
              catch (Throwable e)
              {
                  throw new RuntimeException("Failed to transfer field: " + sourceField.getName(), e);
              }
          }
      }
  }