81 lines
2 KiB
Go
81 lines
2 KiB
Go
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// Copyright 2015-2018 trivago N.V.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package treflect
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import (
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"reflect"
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)
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// Clone does a deep copy of the given value.
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// Please note that field have to be public in order to be copied.
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// Private fields will be ignored.
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func Clone(v interface{}) interface{} {
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value := reflect.ValueOf(v)
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copy := clone(value)
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return copy.Interface()
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}
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func clone(v reflect.Value) reflect.Value {
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switch v.Kind() {
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case reflect.Struct:
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copy := reflect.New(v.Type())
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for i := 0; i < v.Type().NumField(); i++ {
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field := v.Field(i)
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targetField := copy.Elem().Field(i)
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if !targetField.CanSet() {
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continue // ignore private fields
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}
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fieldCopy := clone(field)
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targetField.Set(fieldCopy)
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}
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return copy.Elem()
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case reflect.Chan:
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copy := reflect.MakeChan(v.Type(), v.Len())
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return copy
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case reflect.Map:
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copy := reflect.MakeMap(v.Type())
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keys := v.MapKeys()
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for _, k := range keys {
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fieldCopy := clone(v.MapIndex(k))
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copy.SetMapIndex(k, fieldCopy)
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}
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return copy
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case reflect.Slice:
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copy := reflect.MakeSlice(v.Type(), v.Len(), v.Len())
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for i := 0; i < v.Len(); i++ {
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elementCopy := clone(v.Index(i))
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copy.Index(i).Set(elementCopy)
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}
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return copy
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case reflect.Array:
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copy := reflect.New(v.Type()).Elem()
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for i := 0; i < v.Len(); i++ {
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elementCopy := clone(v.Index(i))
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copy.Index(i).Set(elementCopy)
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}
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return copy
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default:
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copy := reflect.New(v.Type())
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copy.Elem().Set(v)
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return copy.Elem()
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}
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}
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