private String formatElement()

in src/main/java/org/apache/log4j/EnhancedThrowableRenderer.java [86:148]
53 lines of code
13 McCabe index (conditional complexity)

    private String formatElement(final Object element, final Map classMap) {
        StringBuffer buf = new StringBuffer("\tat ");
        buf.append(element);
        try {
            String className = getClassNameMethod.invoke(element, (Object[]) null).toString();
            Object classDetails = classMap.get(className);
            if (classDetails != null) {
                buf.append(classDetails);
            } else {
                Class cls = findClass(className);
                int detailStart = buf.length();
                buf.append('[');
                try {
                    CodeSource source = cls.getProtectionDomain().getCodeSource();
                    if (source != null) {
                        URL locationURL = source.getLocation();
                        if (locationURL != null) {
                            //
                            //   if a file: URL
                            //
                            if ("file".equals(locationURL.getProtocol())) {
                                String path = locationURL.getPath();
                                if (path != null) {
                                    //
                                    //  find the last file separator character
                                    //
                                    int lastSlash = path.lastIndexOf('/');
                                    int lastBack = path.lastIndexOf(File.separatorChar);
                                    if (lastBack > lastSlash) {
                                        lastSlash = lastBack;
                                    }
                                    //
                                    //  if no separator or ends with separator (a directory)
                                    //     then output the URL, otherwise just the file name.
                                    //
                                    if (lastSlash <= 0 || lastSlash == path.length() - 1) {
                                        buf.append(locationURL);
                                    } else {
                                        buf.append(path.substring(lastSlash + 1));
                                    }
                                }
                            } else {
                                buf.append(locationURL);
                            }
                        }
                    }
                } catch(SecurityException ex) {
                }
                buf.append(':');
                Package pkg = cls.getPackage();
                if (pkg != null) {
                    String implVersion = pkg.getImplementationVersion();
                    if (implVersion != null) {
                        buf.append(implVersion);
                    }
                }
                buf.append(']');
                classMap.put(className, buf.substring(detailStart));
            }
        } catch(Exception ex) {
        }
        return buf.toString();
    }