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.document.parser;
  
  import com.agentsflex.core.document.Document;
  import com.agentsflex.core.document.DocumentParser;
  import org.apache.pdfbox.pdmodel.PDDocument;
  import org.apache.pdfbox.text.PDFTextStripper;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  public class PdfBoxDocumentParser implements DocumentParser {
  
      /**
       * 返回整个文档的内容
       */
      @Override
      public Document parse(InputStream stream) {
          try (PDDocument pdfDocument = PDDocument.load(stream)) {
              PDFTextStripper stripper = new PDFTextStripper();
              String text = stripper.getText(pdfDocument);
              return new Document(text);
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
  
      /**
       * 返回每页文档的内容
       */
      public List<Document> parseWithPage(InputStream inputStream) {
          try (PDDocument pdfDocument = PDDocument.load(inputStream)) {
              return getDocuments(pdfDocument);
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
  
      private List<Document> getDocuments(PDDocument pdDocument) throws IOException {
          List<Document> documents = new ArrayList<>();
          int pageCount = pdDocument.getNumberOfPages();
          for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++) {
              PDFTextStripper stripper = new PDFTextStripper();
              stripper.setStartPage(pageNumber);
              stripper.setEndPage(pageNumber);
              String content = stripper.getText(pdDocument);
  
              Document document = new Document();
              document.setContent(content);
  
              document.addMetadata("pageNumber", pageNumber);
              documents.add(document);
          }
          return documents;
      }
  
  }
  