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92f76189a3
Change protoiface.ExtensionDescV1 to implement protoreflect.ExtensionType.
ExtensionDescV1's Name field conflicts with the Descriptor Name method,
so change the protoreflect.{Message,Enum,Extension}Type types to no
longer implement the corresponding Descriptor interface. This also leads
to a clearer distinction between the two types.
Introduce a protoreflect.ExtensionTypeDescriptor type which bridges
between ExtensionType and ExtensionDescriptor.
Add extension accessor functions to the proto package:
proto.{Has,Clear,Get,Set}Extension. These functions take a
protoreflect.ExtensionType parameter, which allows writing the
same function call using either the old or new API:
proto.GetExtension(message, somepb.E_ExtensionFoo)
Fixes golang/protobuf#908
Change-Id: Ibc65d12a46666297849114fd3aefbc4a597d9f08
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/189199
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
34 lines
1.1 KiB
Go
34 lines
1.1 KiB
Go
// Copyright 2019 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 proto
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import (
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// HasExtension reports whether an extension field is populated.
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func HasExtension(m Message, ext protoreflect.ExtensionType) bool {
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return m.ProtoReflect().Has(ext.Descriptor())
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}
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// ClearExtension clears an extension field such that subsequent
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// HasExtension calls return false.
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func ClearExtension(m Message, ext protoreflect.ExtensionType) {
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m.ProtoReflect().Clear(ext.Descriptor())
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}
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// GetExtension retrieves the value for an extension field.
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//
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// If the field is unpopulated, it returns the default value for
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// scalars and an immutable, empty value for lists, maps, or messages.
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func GetExtension(m Message, ext protoreflect.ExtensionType) interface{} {
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return ext.InterfaceOf(m.ProtoReflect().Get(ext.Descriptor()))
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}
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// SetExtension stores the value of an extension field.
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func SetExtension(m Message, ext protoreflect.ExtensionType, value interface{}) {
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m.ProtoReflect().Set(ext.Descriptor(), ext.ValueOf(value))
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}
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