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.sequential;
  
  import com.alibaba.langengine.core.callback.ExecutionContext;
  import com.alibaba.langengine.core.chain.Chain;
  import lombok.Data;
  
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Consumer;
  
  /**
   * Simple chain where the outputs of one step feed directly into next.
   * 简单的链，其中一个步骤的输出直接输入到下一步。
   *
   * @author xiaoxuan.lp
   */
  @Data
  public class SimpleSequentialChain extends Chain {
  
      private List<Chain> chains;
  
      private boolean stripOutputs;
  
      private String inputKey = "input";
  
      private String outputKey = "output";
  
      @Override
      public Map<String, Object> call(Map<String, Object> inputs, ExecutionContext executionContext, Consumer<String> consumer, Map<String, Object> extraAttributes) {
          String _input = inputs.get(inputKey).toString();
          for (Chain chain : chains) {
              Map<String, Object> newInputs = new HashMap<>();
              newInputs.put(chain.getInputKeys().get(0), _input);
              Map<String, Object> result = chain.run(newInputs, extraAttributes);
              List<String> outputKeys = chain.getOutputKeys();
              _input = result.get(outputKeys.get(0)).toString();
              if(stripOutputs) {
                  _input = _input.trim();
              }
          }
          Map<String, Object> outputs = new HashMap<>();
          outputs.put(outputKey, _input);
          return outputs;
      }
  
      @Override
      public List<String> getInputKeys() {
          return Arrays.asList(new String[]{ inputKey });
      }
  
      @Override
      public List<String> getOutputKeys() {
          return Arrays.asList(new String[] { outputKey });
      }
  }
  