content: /*
   * Copyright 2023 Aiven Oy
   *
   * 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 io.aiven.kafka.tieredstorage.config.validators;
  
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.common.config.ConfigException;
  
  /**
   * {@link org.apache.kafka.common.config.ConfigDef.Validator} implementation that verifies
   * that a config value is a subclass of a specified class.
   */
  public class Subclass implements ConfigDef.Validator {
      private final Class<?> parentClass;
  
      public static Subclass of(final Class<?> parentClass) {
          return new Subclass(parentClass);
      }
  
      public Subclass(final Class<?> parentClass) {
          this.parentClass = parentClass;
      }
  
      @Override
      public void ensureValid(final String name, final Object value) {
          if (value != null && !(parentClass.isAssignableFrom((Class<?>) value))) {
              throw new ConfigException(name + " should be a subclass of " + parentClass.getCanonicalName());
          }
      }
          
      @Override
      public String toString() {
          return "Any implementation of " + parentClass.getName();
      }
  }
  