code: public static WaveType getWaveType(final String action) {
  
          WaveType waveType = null;
          if (waveTypeMap.containsKey(action)) {
              waveType = waveTypeMap.get(action);
          }
          return waveType;
      }
docs: Retrieve a WaveType according to its unique action name.
  
  Be careful it could return null if the {@link WaveType} has not been initialized yet.
  
  @param action the unique action name used to register the WaveType
  
  @return the WaveType found into registry or null