private void migrate()

in uimaj-v3migration-jcas/src/main/java/org/apache/uima/migratev3/jcas/MigrateJCas.java [1395:1535]
113 lines of code
18 McCabe index (conditional complexity)

  private void migrate(CommonConverted cc, Container container, Path path) {

    if (null == cc) {
      System.err.println("Skipping this component due to decompile failure: " + path.toString());
      System.err.println("  in container: " + container);
      isConvert2v3 = false;
      error_decompiling = true;
      return;
    }

    if (cc.v3Source != null) {
      // next updates classname2multiSources for tracking non-identical defs
      boolean identical = collectInfoForReports(cc);
      assert identical;
      psb.append("i");
      flush(psb);
      cc.containersAndV2Paths.add(new ContainerAndPath(path, container));
      return;
    }

    assert cc.v2Source != null;

    packageName = null;
    className = null;
    packageAndClassNameSlash = null;
    cu = null;

    String source = cc.v2Source;
    isConvert2v3 = true; // preinit, set false if convert fails
    isV2JCas = false; // preinit, set true by reportV2Class, called by visit to
                      // ClassOrInterfaceDeclaration,
                      // when it has v2 constructors, and the right type and type_index_id field
                      // declares
    isBuiltinJCas = false;
    featNames.clear();
    fi_fields.clear();

    try { // to reset the next 3 items
      current_cc = cc;
      current_container = container;
      current_path = path;

      // System.out.println("Migrating source before migration:\n");
      // System.out.println(source);
      // System.out.println("\n\n\n");
      if (source.startsWith(ERROR_DECOMPILING)) {
        System.err.println("Decompiling failed for class: " + cc.toString() + "\n got: "
                + Misc.elide(source, 300, false));
        System.err.println("Please check the migrateClasspath");
        if (null == migrateClasspath) {
          System.err.println("classpath of this app is");
          System.err.println(System.getProperty("java.class.path"));
        } else {
          System.err.println(" first part of migrateClasspath argument was: "
                  + Misc.elide(migrateClasspath, 300, false));
          System.err.println("  Value used was:");
          URL[] urls = Misc.classpath2urls(migrateClasspath);
          for (URL url : urls) {
            System.err.println("    " + url.toString());
          }
        }
        System.err.println("Skipping this component");
        isConvert2v3 = false;
        error_decompiling = true;
        return;
      }

      StringReader sr = new StringReader(source);
      try {
        cu = JavaParser.parse(sr);

        addImport("java.lang.invoke.CallSite");
        addImport("java.lang.invoke.MethodHandle");
        addImport("org.apache.uima.cas.impl.CASImpl");
        addImport("org.apache.uima.cas.impl.TypeImpl");
        addImport("org.apache.uima.cas.impl.TypeSystemImpl");

        this.visit(cu, null); // side effect: sets the className, packageAndClassNameSlash,
                              // packageName

        new removeEmptyStmts().visit(cu, null);
        if (isConvert2v3) {
          removeImport("org.apache.uima.jcas.cas.TOP_Type");
        }

        if (isConvert2v3 && fi_fields.size() > 0) {
          NodeList<BodyDeclaration<?>> classMembers = cu.getTypes().get(0).getMembers();
          int positionOfFirstConstructor = findConstructor(classMembers);
          if (positionOfFirstConstructor < 0) {
            throw new RuntimeException();
          }
          classMembers.addAll(positionOfFirstConstructor, fi_fields);
        }

        ImportDeclaration firstImport = cu.getImports().get(0);
        String transformedMessage = String.format(
                " Migrated by uimaj-v3-migration-jcas, %s%n" + " Container: %s%n"
                        + " Path in container: %s%n",
                new Date(), container.toString1(), path.toString()).replace('\\', '/');

        Optional<Comment> existingComment = firstImport.getComment();
        if (existingComment.isPresent()) {
          Comment comment = existingComment.get();
          comment.setContent(comment.getContent() + "\n" + transformedMessage);
        } else {
          firstImport.setBlockComment(transformedMessage);
        }

        if (isSource) {
          sourceToCommonConverted.put(source, cc);
        }

        boolean identicalFound = collectInfoForReports(cc);
        assert !identicalFound;

        if (isV2JCas) {
          writeV2Orig(cc, isConvert2v3);
        }
        if (isConvert2v3) {
          cc.v3Source = new PrettyPrinter(printCu).print(cu);
          writeV3(cc);
        }

        psb.append(isBuiltinJCas ? "b"
                : (classname2multiSources.get(cc.fqcn_slash).size() == 1) ? "." : "d"); // means
                                                                                        // non-identical
                                                                                        // duplicate
        flush(psb);
      } catch (IOException e) {
        e.printStackTrace();
        throw new UIMARuntimeException(e);
      } catch (Exception e) {
        System.out.println("debug: exception caught, source was\n" + source);
        throw new UIMARuntimeException(e);
      }
    } finally {
      current_cc = null;
      current_container = null;
      current_path = null;
    }
  }