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.generator;
  
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.IntStream;
  import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
  import lombok.Data;
  
  @JsonDeserialize(builder = ListGenerator.Builder.class)
  public final class ListGenerator<T> implements Generator<List<T>> {
      private final T item;
      private final int size;
  
      public ListGenerator(Builder<T> builder) {
          item = builder.item;
          size = builder.size;
      }
  
      @Override
      public List<T> next() {
          return IntStream
              .range(0, size)
              .mapToObj($ -> item)
              .collect(Collectors.toList());
      }
  
      @Override
      public void reset() {
          ((Generator<?>) item).reset();
      }
  
      @Data
      public static class Builder<T> {
          private int size;
          private T item;
  
          public ListGenerator<T> build() {
              return new ListGenerator<>(this);
          }
      }
  }
  