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save_arg.go
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save_arg.go
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// Copyright 2015 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// 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 oglemock
import (
"fmt"
"reflect"
)
// Create an Action that saves the argument at the given zero-based index to
// the supplied destination, which must be a pointer to a type that is
// assignable from the argument type.
func SaveArg(index int, dst interface{}) Action {
return &saveArg{
index: index,
dstPointer: dst,
}
}
type saveArg struct {
index int
dstPointer interface{}
// Set by SetSignature.
dstValue reflect.Value
}
func (a *saveArg) SetSignature(signature reflect.Type) (err error) {
// Extract the source type.
if a.index >= signature.NumIn() {
err = fmt.Errorf(
"Out of range argument index %v for function type %v",
a.index,
signature)
return
}
srcType := signature.In(a.index)
// The destination must be a pointer.
v := reflect.ValueOf(a.dstPointer)
if v.Kind() != reflect.Ptr {
err = fmt.Errorf("Destination is %v, not a pointer", v.Kind())
return
}
// Dereference the pointer.
if v.IsNil() {
err = fmt.Errorf("Destination pointer must be non-nil")
return
}
a.dstValue = v.Elem()
// The destination must be assignable from the source.
if !srcType.AssignableTo(a.dstValue.Type()) {
err = fmt.Errorf(
"%v is not assignable to %v",
srcType,
a.dstValue.Type())
return
}
return
}
func (a *saveArg) Invoke(methodArgs []interface{}) (rets []interface{}) {
a.dstValue.Set(reflect.ValueOf(methodArgs[a.index]))
return
}