public SchemeRegistry() 
{
        super();
        registeredSchemes = new LinkedHashMap< String,Scheme >();
}

Creates a new, empty scheme registry.

 public final synchronized Scheme get(String name) 
{
        if (name == null)
            throw new IllegalArgumentException("Name must not be null.");
        // leave it to the caller to use the correct name - all lowercase
        //name = name.toLowerCase();
        Scheme found = registeredSchemes.get(name);
        return found;
}

Obtains a scheme by name, if registered.

 public final synchronized Scheme getScheme(String name) 
{
        Scheme found = get(name);
        if (found == null) {
            throw new IllegalStateException
                ("Scheme '"+name+"' not registered.");
        }
        return found;
}

Obtains a scheme by name.

 public final synchronized Scheme getScheme(HttpHost host) 
{
        if (host == null) {
            throw new IllegalArgumentException("Host must not be null.");
        }
        return getScheme(host.getSchemeName());
}

Obtains the scheme for a host. Convenience method for getScheme(host.getSchemeName())

 public final synchronized List<String> getSchemeNames() 
{
        return new ArrayList< String >(registeredSchemes.keySet());
}

Obtains the names of the registered schemes in their default order.

 public final synchronized Scheme register(Scheme sch) 
{
        if (sch == null)
            throw new IllegalArgumentException("Scheme must not be null.");
        Scheme old = registeredSchemes.put(sch.getName(), sch);
        return old;
}

Registers a scheme. The scheme can later be retrieved by its name using getScheme or get .

 public synchronized  void setItems(Map<String, Scheme> map) 
{
        if (map == null) {
            return;
        }
        registeredSchemes.clear();
        registeredSchemes.putAll(map);
}

Populates the internal collection of registered protocol schemes with the content of the map passed as a parameter.

 public final synchronized Scheme unregister(String name) 
{
        if (name == null)
            throw new IllegalArgumentException("Name must not be null.");
        // leave it to the caller to use the correct name - all lowercase
        //name = name.toLowerCase();
        Scheme gone = registeredSchemes.remove(name);
        return gone;
}

Unregisters a scheme.