code: public static double getTransition(ProteinSequence sequence, ATTRIBUTE attribute, TRANSITION transition) throws Exception{
  		return new ProfeatPropertiesImpl().getTransition(sequence, attribute, transition);
  	}
docs: An adaptor method which returns the number of transition between the specified groups for the given attribute with respect to the length of sequence.
  
  @param sequence
  a protein sequence consisting of non-ambiguous characters only
  @param attribute
  one of the seven attributes (Hydrophobicity, Volume, Polarity, Polarizability, Charge, SecondaryStructure or SolventAccessibility)
  @param transition
  the interested transition between the groups
  @return
  returns the number of transition between the specified groups for the given attribute with respect to the length of sequence.
  @throws Exception
  throws Exception if attribute or group are unknown