code: /*
   * 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.skywalking.oap.server.library.util.yaml;
  
  import org.yaml.snakeyaml.LoaderOptions;
  import org.yaml.snakeyaml.constructor.Constructor;
  
  /**
   * Whitelist constructor implementation for YAML snake.
   * Copied from Apache ShardingSphere.
   */
  public final class ClassFilterConstructor extends Constructor {
  
      private final Class<?>[] acceptClasses;
  
      public ClassFilterConstructor(final Class<?>[] acceptClasses) {
          super(new LoaderOptions());
          this.acceptClasses = acceptClasses;
      }
  
      @Override
      protected Class<?> getClassForName(final String name) throws ClassNotFoundException {
          for (Class<? extends Object> each : acceptClasses) {
              if (name.equals(each.getName())) {
                  return super.getClassForName(name);
              }
          }
          throw new IllegalArgumentException(String.format("Class is not accepted: %s", name));
      }
  }
  