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.core.chain.router;
  
  import com.alibaba.langengine.core.callback.ExecutionContext;
  import com.alibaba.langengine.core.chain.LLMChain;
  import com.alibaba.langengine.core.languagemodel.BaseLanguageModel;
  import com.alibaba.langengine.core.prompt.BasePromptTemplate;
  import lombok.Data;
  
  import java.util.List;
  import java.util.Map;
  import java.util.function.Consumer;
  
  /**
   * A router chain that uses an LLM chain to perform routing.
   * 使用LLM链执行路由的路由器链。
   *
   * @author xiaoxuan.lp
   */
  @Data
  public class LLMRouterChain extends RouterChain {
  
      /**
       * LLM chain used to perform routing
       * LLM链用于执行路由
       */
      private LLMChain llmChain;
  
      @Override
      public Map<String, Object> call(Map<String, Object> inputs, ExecutionContext executionContext, Consumer<String> consumer, Map<String, Object> extraAttributes) {
          Object result = llmChain.predictAndParse(inputs, extraAttributes);
          if(result instanceof Map) {
              return (Map)result;
          }
          return null;
      }
  
      @Override
      public List<String> getInputKeys() {
          return llmChain.getInputKeys();
      }
  
      public static LLMRouterChain fromLlm(BaseLanguageModel llm, BasePromptTemplate prompt){
          LLMChain chain = new LLMChain();
          chain.setLlm(llm);
          chain.setPrompt(prompt);
          LLMRouterChain llmRouterChain = new LLMRouterChain();
          llmRouterChain.setLlmChain(chain);
          return llmRouterChain;
      }
  }
  