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package cty
import (
"fmt"
)
// TypeList instances represent specific list types. Each distinct ElementType
// creates a distinct, non-equal list type.
type typeMap struct {
typeImplSigil
ElementTypeT Type
}
// Map creates a map type with the given element Type.
//
// Map types are CollectionType implementations.
func Map(elem Type) Type {
return Type{
typeMap{
ElementTypeT: elem,
},
}
}
// Equals returns true if the other Type is a map whose element type is
// equal to that of the receiver.
func (t typeMap) Equals(other Type) bool {
ot, isMap := other.typeImpl.(typeMap)
if !isMap {
return false
}
return t.ElementTypeT.Equals(ot.ElementTypeT)
}
func (t typeMap) FriendlyName() string {
return "map of " + t.ElementTypeT.FriendlyName()
}
func (t typeMap) ElementType() Type {
return t.ElementTypeT
}
func (t typeMap) GoString() string {
return fmt.Sprintf("cty.Map(%#v)", t.ElementTypeT)
}
// IsMapType returns true if the given type is a list type, regardless of its
// element type.
func (t Type) IsMapType() bool {
_, ok := t.typeImpl.(typeMap)
return ok
}
// MapElementType is a convenience method that checks if the given type is
// a map type, returning a pointer to its element type if so and nil
// otherwise. This is intended to allow convenient conditional branches,
// like so:
//
// if et := t.MapElementType(); et != nil {
// // Do something with *et
// }
func (t Type) MapElementType() *Type {
if lt, ok := t.typeImpl.(typeMap); ok {
return <.ElementTypeT
}
return nil
}
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