package?net.jcip.examples;

import?java.util.*;

/**
?*?Animals
?*?

?*?Thread?confinement?of?local?primitive?and?reference?variables
?*
?*?@author?Brian?Goetz?and?Tim?Peierls
?*/
public?class?Animals?{
????Ark?ark;
????Species?species;
????Gender?gender;

????public?int?loadTheArk（Collection?candidates）?{
????????SortedSet?animals;
????????int?numPairs?=?0;
????????Animal?candidate?=?null;

????????//?animals?confined?to?method?don‘t?let?them?escape!
????????animals?=?new?TreeSet（new?SpeciesGenderComparator（））;
????????animals.addAll（candidates）;
????????for?（Animal?a?:?animals）?{
????????????if?（candidate?==?null?||?!candidate.isPotentialMate（a））
????????????????candidate?=?a;
????????????else?{
????????????????ark.load（new?AnimalPair（candidate?a））;
????????????????++numPairs;
????????????????candidate?=?null;
????????????}
????????}
????????return?numPairs;
????}


????class?Animal?{
????????Species?species;
????????Gender?gender;

????????public?boolean?isPotentialMate（Animal?other）?{
????????????return?species?==?other.species?&&?gender?!=?other.gender;
????????}
????}

????enum?Species?{
????????AARDVARK?BENGAL_TIGER?CARIBOU?DINGO?ELEPHANT?FROG?GNU?HYENA
????????IGUANA?JAGUAR?KIWI?LEOPARD?MASTADON?NEWT?OCTOPUS
????????PIRANHA?QUETZAL?RHINOCEROS?SALAMANDER?THREE_TOED_SLOTH
????????UNICORN?VIPER?WEREWOLF?XANTHUS_HUMMINBIRD?YAK?ZEBRA
????}

????enum?Gender?{
????????MALE?FEMALE
????}

????class?AnimalPair?{
????????private?final?Animal?one?two;

????????public?AnimalPair（Animal?one?Animal?two）?{
????????????this.one?=?one;
????????????this.two?=?two;
????????}
????}

????class?SpeciesGenderComparator?implements?Comparator?{
????????public?int?compare（Animal?one?Animal?two）?{
????????????int?speciesCompare?=?one.species.compareTo（two.species）;
????????????return?（speciesCompare?!=?0）
??????????????????????speciesCompare
????????????????????:?one.gender.compareTo（two.gender）;
????????}
????}

????class?Ark?{
????????private?final?Set?loadedAnimals?=?new?HashSet（）;

????????public?void?load（AnimalPair?pair）?{
????????????loadedAnimals.add（pair）;
????????}
????}
}