package Ġcom . amaz ing engine ers kt . back tol ife Ċ Ċ import Ġio . flutter . plugin . common . Plugin Registry Ċ Ċ object ĠFirebase Cloud Messaging Plugin Ġ{ ĊĊĠĠĠ Ġfun Ġregister With ( plugin Registry : ĠPlugin Registry ) Ġ{ ĊĠĠĠĠĠĠĠ Ġif Ġ( already Register With ( plugin Registry )) Ġreturn ĊĠĠĠĠĠĠĠ Ġregister With ( plugin Registry ) ĊĠĠĠ Ġ} ĊĊĠĠĠ Ġprivate Ġfun Ġalready Register With ( plugin Registry : ĠPlugin Registry ): ĠBoolean Ġ{ ĊĠĠĠĠĠĠĠ Ġval Ġkey Ġ= ĠFirebase Cloud Messaging Plugin :: class . java . canonical Name ĊĠĠĠĠĠĠĠ Ġif Ġ( plugin Registry . has Plugin ( key )) Ġreturn Ġtrue ĊĠĠĠĠĠĠĠ Ġplugin Registry . regist rar For ( key ) ĊĠĠĠĠĠĠĠ Ġreturn Ġfalse ĊĠĠĠ Ġ} Ċ }