package Ġcom . github . s urs mob il . wer ner . data . t anks Ċ Ċ import Ġcom . fasterxml . jackson . databind . annotation . Json Deserialize Ċ import Ġcom . github . s urs mob il . wer ner . model . Engine Ċ import Ġcom . github . s urs mob il . wer ner . model . Mount Surface Ċ Ċ @ Json Deserialize (` as ` Ġ= ĠBase T anks Registry :: class , Ġusing Ġ= ĠT ank Registry Deserializer :: class ) Ċ interface ĠT anks Registry Ġ: ĠSet < Tank > Ġ{ ĊĠĠĠ Ġfun Ġonly Mount able ( surface : ĠMount Surface ): ĠT anks Registry ĊĠĠĠ Ġfun Ġonly Same Fuel ( engine : ĠEngine ): ĠT anks Registry ĊĠĠĠ Ġfun Ġvol Descending (): ĠList < Tank > ĊĠĠĠ Ġfun Ġvol Sm allest (): ĠT ank ĊĊĠĠĠ Ġoperator Ġfun Ġplus ( other : ĠT anks Registry ): ĠT anks Registry Ċ } Ċ Ċ class ĠBase T anks Registry ( ĊĠĠĠĠĠĠĠ Ġval Ġt anks : ĠSet < Tank > Ċ ) Ġ: ĠT anks Registry , ĠSet < Tank > Ġby Ġt anks Ġ{ ĊĠĠĠ Ġoverride Ġfun Ġonly Mount able ( surface : ĠMount Surface ): ĠT anks Registry Ġ= ĊĠĠĠĠĠĠĠĠĠĠĠ ĠBase T anks Registry ( t anks . filter Ġ{ Ġit . can Be Mount ed ( surface ) Ġ}. toSet ()) ĊĊĠĠĠ Ġoverride Ġfun Ġonly Same Fuel ( engine : ĠEngine ): ĠT anks Registry Ġ= ĊĠĠĠĠĠĠĠĠĠĠĠ ĠBase T anks Registry ( t anks . filter Ġ{ Ġit . fuel Type Ġ== Ġengine . fuel Type Ġ}. toSet ()) ĊĊĠĠĠ Ġoverride Ġfun Ġvol Descending (): ĠList < Tank > Ġ= ĊĠĠĠĠĠĠĠĠĠĠĠ Ġt anks . sorted By Ġ{ Ġ- it . vol Ġ} ĊĊĠĠĠ Ġoverride Ġfun Ġvol Sm allest (): ĠT ank Ġ= ĊĠĠĠĠĠĠĠĠĠĠĠ Ġt anks . min By Ġ{ Ġit . vol Ġ} !! ĊĊĠĠĠ Ġoverride Ġoperator Ġfun Ġplus ( other : ĠT anks Registry ): ĠT anks Registry Ġ= ĊĠĠĠĠĠĠĠĠĠĠĠ ĠBase T anks Registry ( union ( other )) Ċ } ĊĊ