private void copyCommonStatic()

in freemarker-docgen-core/src/main/java/org/freemarker/docgen/core/Transform.java [1370:1437]
57 lines of code
21 McCabe index (conditional complexity)

    private void copyCommonStatic(String staticFileName) throws IOException {
        String resourcePath = "statics/" + staticFileName;
        try (InputStream in = Transform.class.getResourceAsStream(resourcePath)) {
            if (in == null) {
                throw new IOException("Failed to open class-loader resource: " + resourcePath + " relatively to "
                        + Transform.class.getPackage().getName());
            }

            if (staticFileName.endsWith(".css") || staticFileName.endsWith(".js")) {
                // ISO-8859-1 will be good enough as far as the resource isn't UTF-16 or EBCDIC:
                final Charset fileCharset = StandardCharsets.ISO_8859_1;
                String content = FileUtil.loadString(in, fileCharset);
                final String eol = TextUtil.detectEOL(content, "\n");

                // If we have an initial comment, then that must be a copyright header, which we will remove.
                if (content.startsWith("/*")) {
                    int commentEnd = content.indexOf("*/");
                    if (commentEnd == -1) {
                        throw new BugException("Unclosed initial \"/*\" in resource " + resourcePath);
                    }
                    commentEnd += 2;
                    String comment = content.substring(0, commentEnd);
                    if (!comment.contains("Copyright") && !comment.contains("copyright")
                            && !comment.contains("License") && !comment.contains("license")) {
                        throw new BugException("The initial /*...*/ comments doesn't look like a copyright header "
                                + "in resource " + resourcePath);
                    }

                    // Include an EOL after the comment, if there's any.
                    for (int i = 0; i < 2; i++) {
                        if (commentEnd < content.length()) {
                            char c = content.charAt(commentEnd);
                            if (c == '\n') {
                                commentEnd++;
                            } else if (c == '\r') {
                                commentEnd++;
                                if (commentEnd < content.length() && content.charAt(commentEnd) == '\n') {
                                    commentEnd++;
                                }
                            }
                        }
                    }

                    // Remove existing copyright header:
                    content = content.substring(commentEnd);
                }

                if (offline && copyrightComment != null) {
                    // Add copyright comment:
                    StringBuilder sb = new StringBuilder(TextUtil.normalizeEOL(copyrightJavaComment, eol));
                    sb.append(eol);
                    if (content.length() > 0 && content.charAt(0) != '\n' && content.charAt(0) != '\r') {
                        sb.append(eol);
                    }
                    sb.append(content);
                    content = sb.toString();
                }

                Path destSubdir = destDir.toPath().resolve("docgen-resources");
                Files.createDirectories(destSubdir);
                Files.write(destSubdir.resolve(staticFileName), content.getBytes(fileCharset));
            } else {
                FileUtil.copyResourceIntoFile(
                        Transform.class, "statics", staticFileName,
                        new File(destDir, "docgen-resources"));
            }
        }
    }