// Copyright 2016-2018, Pulumi Corporation. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package mapper import ( "reflect" ) // AsObject attempts to coerce an existing value to an object map, returning a non-nil error if it cannot be done. func AsObject(v interface{}, ty reflect.Type, key string) (map[string]interface{}, FieldError) { if vmap, ok := v.(map[string]interface{}); ok { return vmap, nil } return nil, NewWrongTypeError( ty, key, reflect.TypeOf(make(map[string]interface{})), reflect.TypeOf(v)) } // AsString attempts to coerce an existing value to a string, returning a non-nil error if it cannot be done. func AsString(v interface{}, ty reflect.Type, key string) (*string, FieldError) { if s, ok := v.(string); ok { return &s, nil } return nil, NewWrongTypeError(ty, key, reflect.TypeOf(""), reflect.TypeOf(v)) } // FieldObject looks up a field by name within an object map, coerces it to an object itself, and returns it. If the // field exists but is not an object map, or it is missing and optional is false, a non-nil error is returned. func FieldObject(obj map[string]interface{}, ty reflect.Type, key string, optional bool) (map[string]interface{}, FieldError) { if o, has := obj[key]; has { return AsObject(o, ty, key) } else if !optional { // The field doesn't exist and yet it is required; issue an error. return nil, NewMissingError(ty, key) } return nil, nil } // FieldString looks up a field by name within an object map, coerces it to a string, and returns it. If the // field exists but is not a string, or it is missing and optional is false, a non-nil error is returned. func FieldString(obj map[string]interface{}, ty reflect.Type, key string, optional bool) (*string, FieldError) { if s, has := obj[key]; has { return AsString(s, ty, key) } else if !optional { // The field doesn't exist and yet it is required; issue an error. return nil, NewMissingError(ty, key) } return nil, nil }