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path: root/vendor/github.com/golang/protobuf/proto/clone.go
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Diffstat (limited to 'vendor/github.com/golang/protobuf/proto/clone.go')
-rw-r--r--vendor/github.com/golang/protobuf/proto/clone.go46
1 files changed, 35 insertions, 11 deletions
diff --git a/vendor/github.com/golang/protobuf/proto/clone.go b/vendor/github.com/golang/protobuf/proto/clone.go
index e392575..3cd3249 100644
--- a/vendor/github.com/golang/protobuf/proto/clone.go
+++ b/vendor/github.com/golang/protobuf/proto/clone.go
@@ -35,22 +35,39 @@
package proto
import (
+ "fmt"
"log"
"reflect"
"strings"
)
// Clone returns a deep copy of a protocol buffer.
-func Clone(pb Message) Message {
- in := reflect.ValueOf(pb)
+func Clone(src Message) Message {
+ in := reflect.ValueOf(src)
if in.IsNil() {
- return pb
+ return src
}
-
out := reflect.New(in.Type().Elem())
- // out is empty so a merge is a deep copy.
- mergeStruct(out.Elem(), in.Elem())
- return out.Interface().(Message)
+ dst := out.Interface().(Message)
+ Merge(dst, src)
+ return dst
+}
+
+// Merger is the interface representing objects that can merge messages of the same type.
+type Merger interface {
+ // Merge merges src into this message.
+ // Required and optional fields that are set in src will be set to that value in dst.
+ // Elements of repeated fields will be appended.
+ //
+ // Merge may panic if called with a different argument type than the receiver.
+ Merge(src Message)
+}
+
+// generatedMerger is the custom merge method that generated protos will have.
+// We must add this method since a generate Merge method will conflict with
+// many existing protos that have a Merge data field already defined.
+type generatedMerger interface {
+ XXX_Merge(src Message)
}
// Merge merges src into dst.
@@ -58,17 +75,24 @@ func Clone(pb Message) Message {
// Elements of repeated fields will be appended.
// Merge panics if src and dst are not the same type, or if dst is nil.
func Merge(dst, src Message) {
+ if m, ok := dst.(Merger); ok {
+ m.Merge(src)
+ return
+ }
+
in := reflect.ValueOf(src)
out := reflect.ValueOf(dst)
if out.IsNil() {
panic("proto: nil destination")
}
if in.Type() != out.Type() {
- // Explicit test prior to mergeStruct so that mistyped nils will fail
- panic("proto: type mismatch")
+ panic(fmt.Sprintf("proto.Merge(%T, %T) type mismatch", dst, src))
}
if in.IsNil() {
- // Merging nil into non-nil is a quiet no-op
+ return // Merge from nil src is a noop
+ }
+ if m, ok := dst.(generatedMerger); ok {
+ m.XXX_Merge(src)
return
}
mergeStruct(out.Elem(), in.Elem())
@@ -84,7 +108,7 @@ func mergeStruct(out, in reflect.Value) {
mergeAny(out.Field(i), in.Field(i), false, sprop.Prop[i])
}
- if emIn, ok := extendable(in.Addr().Interface()); ok {
+ if emIn, err := extendable(in.Addr().Interface()); err == nil {
emOut, _ := extendable(out.Addr().Interface())
mIn, muIn := emIn.extensionsRead()
if mIn != nil {