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.embeddings;
  
  import com.alibaba.langengine.core.indexes.Document;
  import com.alibaba.langengine.core.storage.BaseStore;
  import lombok.Data;
  
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * 用于缓存嵌入模型结果的接口
   *
   * @author xiaoxuan.lp
   */
  @Data
  public class CacheBackedEmbeddings extends Embeddings {
  
      private Embeddings underlyingEmbeddings;
  
      private BaseStore<String, List<Double>> documentEmbeddingStore;
  
      public CacheBackedEmbeddings(Embeddings underlyingEmbeddings,
                                   BaseStore<String, List<Double>> documentEmbeddingStore) {
          setUnderlyingEmbeddings(underlyingEmbeddings);
          setDocumentEmbeddingStore(documentEmbeddingStore);
      }
  
      @Override
      public String getModelType() {
          return "0";
      }
  
      @Override
      public List<Document> embedDocument(List<Document> documents) {
          for (Document document : documents) {
              List<Double> embeddingsValue = documentEmbeddingStore.get(document.getPageContent());
              if(embeddingsValue != null && embeddingsValue.size() > 0) {
                  document.setEmbedding(embeddingsValue);
              } else {
                  underlyingEmbeddings.embedDocument(Arrays.asList(new Document[] { document }));
                  documentEmbeddingStore.set(document.getPageContent(), document.getEmbedding());
              }
          }
          return documents;
      }
  
      @Override
      public List<String> embedQuery(String text, int recommend) {
          return underlyingEmbeddings.embedQuery(text, recommend);
      }
  }
  