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// Copyright 2018 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package impl |
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import ( |
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"fmt" |
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"reflect" |
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"google.golang.org/protobuf/reflect/protoreflect" |
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) |
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func newListConverter(t reflect.Type, fd protoreflect.FieldDescriptor) Converter { |
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switch { |
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case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Slice: |
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return &listPtrConverter{t, newSingularConverter(t.Elem().Elem(), fd)} |
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case t.Kind() == reflect.Slice: |
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return &listConverter{t, newSingularConverter(t.Elem(), fd)} |
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} |
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panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName())) |
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} |
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type listConverter struct { |
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goType reflect.Type // []T |
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c Converter |
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} |
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func (c *listConverter) PBValueOf(v reflect.Value) protoreflect.Value { |
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if v.Type() != c.goType { |
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType)) |
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} |
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pv := reflect.New(c.goType) |
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pv.Elem().Set(v) |
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return protoreflect.ValueOfList(&listReflect{pv, c.c}) |
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} |
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func (c *listConverter) GoValueOf(v protoreflect.Value) reflect.Value { |
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rv := v.List().(*listReflect).v |
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if rv.IsNil() { |
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return reflect.Zero(c.goType) |
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} |
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return rv.Elem() |
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} |
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func (c *listConverter) IsValidPB(v protoreflect.Value) bool { |
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list, ok := v.Interface().(*listReflect) |
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if !ok { |
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return false |
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} |
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return list.v.Type().Elem() == c.goType |
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} |
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func (c *listConverter) IsValidGo(v reflect.Value) bool { |
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return v.IsValid() && v.Type() == c.goType |
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} |
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func (c *listConverter) New() protoreflect.Value { |
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return protoreflect.ValueOfList(&listReflect{reflect.New(c.goType), c.c}) |
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} |
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func (c *listConverter) Zero() protoreflect.Value { |
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return protoreflect.ValueOfList(&listReflect{reflect.Zero(reflect.PtrTo(c.goType)), c.c}) |
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} |
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type listPtrConverter struct { |
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goType reflect.Type // *[]T |
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c Converter |
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} |
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func (c *listPtrConverter) PBValueOf(v reflect.Value) protoreflect.Value { |
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if v.Type() != c.goType { |
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType)) |
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} |
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return protoreflect.ValueOfList(&listReflect{v, c.c}) |
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} |
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func (c *listPtrConverter) GoValueOf(v protoreflect.Value) reflect.Value { |
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return v.List().(*listReflect).v |
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} |
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func (c *listPtrConverter) IsValidPB(v protoreflect.Value) bool { |
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list, ok := v.Interface().(*listReflect) |
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if !ok { |
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return false |
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} |
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return list.v.Type() == c.goType |
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} |
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func (c *listPtrConverter) IsValidGo(v reflect.Value) bool { |
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return v.IsValid() && v.Type() == c.goType |
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} |
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func (c *listPtrConverter) New() protoreflect.Value { |
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return c.PBValueOf(reflect.New(c.goType.Elem())) |
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} |
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func (c *listPtrConverter) Zero() protoreflect.Value { |
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return c.PBValueOf(reflect.Zero(c.goType)) |
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} |
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type listReflect struct { |
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v reflect.Value // *[]T |
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conv Converter |
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} |
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func (ls *listReflect) Len() int { |
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if ls.v.IsNil() { |
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return 0 |
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} |
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return ls.v.Elem().Len() |
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} |
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func (ls *listReflect) Get(i int) protoreflect.Value { |
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return ls.conv.PBValueOf(ls.v.Elem().Index(i)) |
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} |
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func (ls *listReflect) Set(i int, v protoreflect.Value) { |
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ls.v.Elem().Index(i).Set(ls.conv.GoValueOf(v)) |
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} |
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func (ls *listReflect) Append(v protoreflect.Value) { |
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ls.v.Elem().Set(reflect.Append(ls.v.Elem(), ls.conv.GoValueOf(v))) |
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} |
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func (ls *listReflect) AppendMutable() protoreflect.Value { |
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if _, ok := ls.conv.(*messageConverter); !ok { |
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panic("invalid AppendMutable on list with non-message type") |
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} |
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v := ls.NewElement() |
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ls.Append(v) |
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return v |
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} |
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func (ls *listReflect) Truncate(i int) { |
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ls.v.Elem().Set(ls.v.Elem().Slice(0, i)) |
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} |
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func (ls *listReflect) NewElement() protoreflect.Value { |
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return ls.conv.New() |
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} |
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func (ls *listReflect) IsValid() bool { |
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return !ls.v.IsNil() |
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} |
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func (ls *listReflect) protoUnwrap() interface{} { |
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return ls.v.Interface() |
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} |