config/src/main/java/org/springframework/security/config/annotation/web/configurers/PortMapperConfigurer.java
private PortMapper getPortMapper() {
		if (portMapper == null) {
			PortMapperImpl portMapper = new PortMapperImpl();
			portMapper.setPortMappings(httpsPortMappings);
			this.portMapper = portMapper;
		}
		return portMapper;
	}
private PortMapper getPortMapper() {
		if (portMapper == null) {
			PortMapperImpl portMapper = new PortMapperImpl();
			portMapper.setPortMappings(httpsPortMappings);
			this.portMapper = portMapper;
		}
		return portMapper;
	}
Gets the {@link PortMapper} to use. If {@link #portMapper(PortMapper)} was not
invoked, builds a {@link PortMapperImpl} using the port mappings specified with
{@link #http(int)}.

@return the {@link PortMapper} to use