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queryrouter.go
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queryrouter.go
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package baseapp
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// QueryRouter provides queryables for each query path.
type QueryRouter interface {
AddRoute(r string, h sdk.Querier) (rtr QueryRouter)
Route(path string) (h sdk.Querier)
}
type queryRouter struct {
routes map[string]sdk.Querier
}
// NewQueryRouter returns a reference to a new queryRouter.
//
// TODO: Either make the function private or make return type (queryRouter) public.
func NewQueryRouter() *queryRouter { // nolint: golint
return &queryRouter{
routes: map[string]sdk.Querier{},
}
}
// AddRoute adds a query path to the router with a given Querier. It will panic
// if a duplicate route is given. The route must be alphanumeric.
func (qrt *queryRouter) AddRoute(path string, q sdk.Querier) QueryRouter {
if !isAlphaNumeric(path) {
panic("route expressions can only contain alphanumeric characters")
}
if qrt.routes[path] != nil {
panic(fmt.Sprintf("route %s has already been initialized", path))
}
qrt.routes[path] = q
return qrt
}
// Route returns the Querier for a given query route path.
func (qrt *queryRouter) Route(path string) sdk.Querier {
return qrt.routes[path]
}