content: /*
   *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
   *  <p>
   *  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
   *  <p>
   *  http://www.apache.org/licenses/LICENSE-2.0
   *  <p>
   *  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.agentsflex.core.document;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  
  import static java.util.stream.Collectors.toList;
  
  public interface DocumentTransformer {
  
      Document transform(Document document);
  
      default List<Document> transformAll(List<Document> documents) {
          if (documents == null || documents.isEmpty()){
              return Collections.emptyList();
          }
          return documents.stream()
              .map(this::transform)
              .filter(Objects::nonNull)
              .collect(toList());
      }
  }
  