# State and Keeper

The module `Custom_Asset` keeps state of
- All custom tokens created
- All tokens/addresses that are frozen

### State (types.go)

type FreezeList struct {
	map[string][]sdk.AccAddress
}

type CustomToken struct {
	denom string
	minter sdk.AccAddress
	supply sdk.Int
}

----

type CustomToken struct {
  denom string
  minter sdk.AccAddress
  supply sdk.Int
  frozen_addresses []sdk.AccAddress
}

- - Optionally we can also maintain the same state using just one struct,but the first implementation provides faster lookups at the cost of slightly higher storage
- Also note I used the type `sdk.AccAddress` to make things clear, it would be better to use strings,because after 0.42 all addresses are treated as strings in the sdk.This is true for all documents .

### Keeper (keeper.go)
- The keeper provides the state transitions and queries for the state

#### State Transitions

func (keeper)CreateCustomToken (ctx sdk.Context,c types.CustomToken){}
func (keeper)AddToFreezeList  (ctx sdk.Context,denom string,freezingAddress sdk.AccAddress){}
func (keeper)RemoveFromFreezeList  (ctx sdk.Context,denom string,unFreezingAddress sdk.AccAddress){}

#### Helpers / Queries

func (keeper)IsFrozen (ctx sdk.Context,denom string,checkingAddress string){
	- Convert string to address
	- Get freezelist for denom
	- Iterate list , if a value matches the checkingAddress return true
	- return false after loop
}
func (keeper)IsCustomAsset(ctx sdk.Context,checkingDenom string) bool {
	- Get Prefixed iterator
	- Iterate all records 
	- if record.denom == checkingDenom return true
	- return false at the end of the loop
}

- It would also have queries , but I am not going into those details

The `bank_wrapper` module does not have any state of its own.