public JarArchive()

in xbean-finder/src/main/java/org/apache/xbean/finder/archive/JarArchive.java [50:107]
41 lines of code
8 McCabe index (conditional complexity)

    public JarArchive(ClassLoader loader, URL url){
//        if (!"jar".equals(url.getProtocol())) throw new IllegalArgumentException("not a jar url: " + url);

        this.loader = loader;
        this.url = url;
        File jarFile = null;
        String jarPath;
        int idx;

        // Wipe out 'jar:' prefix AND '!/{...}' suffix(if any)
        if("jar".equalsIgnoreCase(url.getProtocol())){

            try{
                jarPath = url.getPath();
                url = new URL(jarPath.endsWith("!/") ?
                        jarPath.substring(0, jarPath.lastIndexOf("!/"))
                        : jarPath);
            }catch(MalformedURLException ex){
                throw new IllegalArgumentException(
                        "Please provide 'file:/...' or 'jar:file:/...!/' URL"
                                + " instead of '" + FileArchive.decode(String.valueOf(url)) + "'");
            }
        }

        try{
            // handle 'file:/...' URL
            if("file".equalsIgnoreCase(url.getProtocol())){

                // Testing if file DOEN't exists AND trying
                //  substrings up to every '!/{...}' as path
                idx = 0;
                jarPath = FileArchive.decode(url.getPath());
                for(String jp = jarPath; !(jarFile = new File(jp)).exists()
                        && (idx = jarPath.indexOf("!/", idx + 1)) > 0;
                        jp = jarPath.substring(0, idx)){}

                // All substrings attempted, but referenced file wasn't discovered
                if(!jarFile.exists()){

                    // To be caught later and wrapped into IllegalStateEx - default behavior
                    throw new FileNotFoundException(FileArchive.decode(String.valueOf(url)));
                }

            }else{
                throw new IllegalArgumentException(
                        "Please provide 'file:/...' or 'jar:file:/...!/' URL"
                                + " instead of '" + FileArchive.decode(String.valueOf(url)) + "'");
            }

            jar = new JarFile(jarFile);

        }catch(IOException e){
            throw new IllegalStateException("Cannot open jar(zip) '"
                    + jarFile != null ? // why can it be null? but since compiler thinks so...
                            jarFile.getAbsolutePath()
                            : FileArchive.decode(String.valueOf(url)) + "'", e);
        }
    }