protected InputStream renderHtml()

in java/org/apache/catalina/servlets/DefaultServlet.java [1760:1943]
152 lines of code
20 McCabe index (conditional complexity)

    protected InputStream renderHtml(HttpServletRequest request, String contextPath, WebResource resource,
            String encoding) throws IOException {

        // Prepare a writer to a buffered area
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        OutputStreamWriter osWriter = new OutputStreamWriter(stream, StandardCharsets.UTF_8);
        PrintWriter writer = new PrintWriter(osWriter);

        StringBuilder sb = new StringBuilder();

        // Get the right strings
        StringManager sm = StringManager.getManager(DefaultServlet.class.getPackageName(), request.getLocales());

        String directoryWebappPath = resource.getWebappPath();
        WebResource[] entries = resources.listResources(directoryWebappPath);

        // rewriteUrl(contextPath) is expensive. cache result for later reuse
        String rewrittenContextPath = rewriteUrl(contextPath);

        // Render the page header
        sb.append("<!doctype html>\r\n");
        sb.append("<html lang=\"").append(sm.getLocale().getLanguage()).append("\">\r\n");
        sb.append("<head>\r\n");
        sb.append("<title>");
        sb.append(sm.getString("defaultServlet.directory.title", directoryWebappPath));
        sb.append("</title>\r\n");
        sb.append("<style>");
        sb.append(org.apache.catalina.util.TomcatCSS.TOMCAT_CSS);
        sb.append("</style>\r\n");
        sb.append("</head>\r\n");
        sb.append("<body>\r\n");
        sb.append("<h1>");
        sb.append(sm.getString("defaultServlet.directory.title", directoryWebappPath));

        // Render the link to our parent (if required)
        String parentDirectory = directoryWebappPath;
        if (parentDirectory.endsWith("/")) {
            parentDirectory = parentDirectory.substring(0, parentDirectory.length() - 1);
        }
        int slash = parentDirectory.lastIndexOf('/');
        if (slash >= 0) {
            String parent = directoryWebappPath.substring(0, slash);
            sb.append(" \u2013 <a href=\"");
            sb.append(rewrittenContextPath);
            if (parent.isEmpty()) {
                parent = "/";
            }
            sb.append(rewriteUrl(parent));
            if (!parent.endsWith("/")) {
                sb.append('/');
            }
            sb.append("\">");
            sb.append("<b>");
            sb.append(sm.getString("defaultServlet.directory.parent", parent));
            sb.append("</b>");
            sb.append("</a>");
        }

        sb.append("</h1>\r\n");
        sb.append("<hr class=\"line\">\r\n");

        sb.append("<table width=\"100%\" cellspacing=\"0\"" + " cellpadding=\"5\" align=\"center\">\r\n");

        SortManager.Order order;
        if (sortListings) {
            order = sortManager.getOrder(request.getQueryString());
        } else {
            order = null;
        }
        // Render the column headings
        sb.append("<thead>\r\n");
        sb.append("<tr>\r\n");
        sb.append("<th align=\"left\"><font size=\"+1\"><strong>");
        if (order != null) {
            sb.append("<a href=\"?C=N;O=");
            sb.append(getOrderChar(order, 'N'));
            sb.append("\">");
            sb.append(sm.getString("defaultServlet.resource.name"));
            sb.append("</a>");
        } else {
            sb.append(sm.getString("defaultServlet.resource.name"));
        }
        sb.append("</strong></font></th>\r\n");
        sb.append("<th align=\"center\"><font size=\"+1\"><strong>");
        if (order != null) {
            sb.append("<a href=\"?C=S;O=");
            sb.append(getOrderChar(order, 'S'));
            sb.append("\">");
            sb.append(sm.getString("defaultServlet.resource.size"));
            sb.append("</a>");
        } else {
            sb.append(sm.getString("defaultServlet.resource.size"));
        }
        sb.append("</strong></font></th>\r\n");
        sb.append("<th align=\"right\"><font size=\"+1\"><strong>");
        if (order != null) {
            sb.append("<a href=\"?C=M;O=");
            sb.append(getOrderChar(order, 'M'));
            sb.append("\">");
            sb.append(sm.getString("defaultServlet.resource.lastModified"));
            sb.append("</a>");
        } else {
            sb.append(sm.getString("defaultServlet.resource.lastModified"));
        }
        sb.append("</strong></font></th>\r\n");
        sb.append("</tr>\r\n");
        sb.append("</thead>\r\n");

        if (null != sortManager) {
            sortManager.sort(entries, request.getQueryString());
        }

        boolean shade = false;
        sb.append("<tbody>\r\n");
        for (WebResource childResource : entries) {
            String filename = childResource.getName();
            if (filename.equalsIgnoreCase("WEB-INF") || filename.equalsIgnoreCase("META-INF")) {
                continue;
            }

            if (!childResource.exists()) {
                continue;
            }

            sb.append("<tr");
            if (shade) {
                sb.append(" bgcolor=\"#eeeeee\"");
            }
            sb.append(">\r\n");
            shade = !shade;

            sb.append("<td align=\"left\">&nbsp;&nbsp;\r\n");
            sb.append("<a href=\"");
            sb.append(rewrittenContextPath);
            sb.append(rewriteUrl(childResource.getWebappPath()));
            if (childResource.isDirectory()) {
                sb.append('/');
            }
            sb.append("\"><tt>");
            sb.append(Escape.htmlElementContent(filename));
            if (childResource.isDirectory()) {
                sb.append('/');
            }
            sb.append("</tt></a></td>\r\n");

            sb.append("<td align=\"right\"><tt>");
            if (childResource.isDirectory()) {
                sb.append("&nbsp;");
            } else {
                sb.append(renderSize(childResource.getContentLength()));
            }
            sb.append("</tt></td>\r\n");

            sb.append("<td align=\"right\"><tt>");
            sb.append(renderTimestamp(childResource.getLastModified()));
            sb.append("</tt></td>\r\n");

            sb.append("</tr>\r\n");
        }
        sb.append("</tbody>\r\n");

        // Render the page footer
        sb.append("</table>\r\n");

        sb.append("<hr class=\"line\">\r\n");

        String readme = getReadme(resource, encoding);
        if (readme != null) {
            sb.append(readme);
            sb.append("<hr class=\"line\">\r\n");
        }

        if (showServerInfo) {
            sb.append("<h3>").append(ServerInfo.getServerInfo()).append("</h3>\r\n");
        }
        sb.append("</body>\r\n");
        sb.append("</html>\r\n");

        // Return an input stream to the underlying bytes
        writer.write(sb.toString());
        writer.flush();
        return new ByteArrayInputStream(stream.toByteArray());

    }