content: /**
   * Copyright (C) 2024 AIDC-AI
   *
   * 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 com.alibaba.langengine.aliyunaisearch.sdk;
  
  import com.google.gson.annotations.SerializedName;
  import com.google.gson.annotations.SerializedName;
  
  import java.util.List;
  import java.util.Objects;
  
  
  
  /**
   * History Item
   * Represents a single item in the search history
   */
  public class HistoryItem {
      // Role enumeration (document limitation: system, user, assistant)
      public enum Role {
          @SerializedName("system") SYSTEM,
          @SerializedName("user") USER,
          @SerializedName("assistant") ASSISTANT
      }
  
      @SerializedName("role")
      private final Role role;
      @SerializedName("content")
      private final String content;
  
      public HistoryItem(Role role, String content) {
          this.role = Objects.requireNonNull(role, "Conversation role cannot be null");
          this.content = Objects.requireNonNull(content, "Conversation content cannot be null");
      }
  
      // Getter
      public Role getRole() { return role; }
      public String getContent() { return content; }
  }
  
  /**
   * Search result filtering mode (corresponds to optional values of way parameter in documentation)
   */
  enum SearchWayEnum {
      @SerializedName("normal") NORMAL,
      @SerializedName("fast") FAST,
      @SerializedName("full") FULL
  }