public static void detectDocumentText()

in vision/snippets/src/main/java/com/example/vision/Detect.java [69:126]
48 lines of code
8 McCabe index (conditional complexity)

  public static void detectDocumentText(String filePath) throws IOException {
    List<AnnotateImageRequest> requests = new ArrayList<>();

    ByteString imgBytes = ByteString.readFrom(new FileInputStream(filePath));

    Image img = Image.newBuilder().setContent(imgBytes).build();
    Feature feat = Feature.newBuilder().setType(Type.DOCUMENT_TEXT_DETECTION).build();
    AnnotateImageRequest request =
        AnnotateImageRequest.newBuilder().addFeatures(feat).setImage(img).build();
    requests.add(request);

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the "close" method on the client to safely clean up any remaining background resources.
    try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
      BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
      List<AnnotateImageResponse> responses = response.getResponsesList();
      client.close();

      for (AnnotateImageResponse res : responses) {
        if (res.hasError()) {
          System.out.format("Error: %s%n", res.getError().getMessage());
          return;
        }

        // For full list of available annotations, see http://g.co/cloud/vision/docs
        TextAnnotation annotation = res.getFullTextAnnotation();
        for (Page page : annotation.getPagesList()) {
          String pageText = "";
          for (Block block : page.getBlocksList()) {
            String blockText = "";
            for (Paragraph para : block.getParagraphsList()) {
              String paraText = "";
              for (Word word : para.getWordsList()) {
                String wordText = "";
                for (Symbol symbol : word.getSymbolsList()) {
                  wordText = wordText + symbol.getText();
                  System.out.format(
                      "Symbol text: %s (confidence: %f)%n",
                      symbol.getText(), symbol.getConfidence());
                }
                System.out.format(
                    "Word text: %s (confidence: %f)%n%n", wordText, word.getConfidence());
                paraText = String.format("%s %s", paraText, wordText);
              }
              // Output Example using Paragraph:
              System.out.println("%nParagraph: %n" + paraText);
              System.out.format("Paragraph Confidence: %f%n", para.getConfidence());
              blockText = blockText + paraText;
            }
            pageText = pageText + blockText;
          }
        }
        System.out.println("%nComplete annotation:");
        System.out.println(annotation.getText());
      }
    }
  }