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.library.elasticsearch.requests.search;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.base.Preconditions.checkState;
  import java.time.Duration;
  import com.google.common.base.Strings;
  
  public final class ScrollBuilder {
      private Duration contextRetention;
      private String scrollId;
  
      public ScrollBuilder contextRetention(Duration contextRetention) {
          checkArgument(
              contextRetention != null && !contextRetention.isNegative()
                  && !contextRetention.isZero(),
              "contextRetention must be positive, but was %s", contextRetention);
          this.contextRetention = contextRetention;
          return this;
      }
  
      public ScrollBuilder scrollId(String scrollId) {
          checkArgument(!Strings.isNullOrEmpty(scrollId), "scrollId cannot be blank");
          this.scrollId = scrollId;
          return this;
      }
  
      public Scroll build() {
          checkState(contextRetention != null, "contextRetention is not set");
          checkState(scrollId != null, "scrollId is not set");
          return new Scroll(contextRetention.getSeconds() + "s", scrollId);
      }
  }
  