Class: Google::Protobuf::Any
- Inherits:
-
Object
- Object
- Google::Protobuf::Any
- Defined in:
- lib/google/cloud/spanner/admin/database/v1/doc/google/protobuf/any.rb,
lib/google/cloud/spanner/admin/instance/v1/doc/google/protobuf/any.rb
Overview
Any contains an arbitrary serialized protocol buffer message along with a URL that describes the type of the serialized message.
Protobuf library provides support to pack/unpack Any values in the form of utility functions or additional generated methods of the Any type.
Example 1: Pack and unpack a message in C++.
Foo foo = ...;
Any any;
any.PackFrom(foo);
...
if (any.UnpackTo(&foo)) {
...
}
Example 2: Pack and unpack a message in Java.
Foo foo = ...;
Any any = Any.pack(foo);
...
if (any.is(Foo.class)) {
foo = any.unpack(Foo.class);
}
Example 3: Pack and unpack a message in Python.
foo = Foo(...)
any = Any()
any.Pack(foo)
...
if any.Is(Foo.DESCRIPTOR):
any.Unpack(foo)
...
Example 4: Pack and unpack a message in Go
foo := &pb.Foo{...}
any, err := ptypes.MarshalAny(foo)
...
foo := &pb.Foo{}
if err := ptypes.UnmarshalAny(any, foo); err != nil {
...
}
The pack methods provided by protobuf library will by default use ‘type.googleapis.com/full.type.name’ as the type URL and the unpack methods only use the fully qualified type name after the last ‘/’ in the type URL, for example “foo.bar.com/x/y.z” will yield type name “y.z”.
JSON
The JSON representation of an Any value uses the regular representation of the deserialized, embedded message, with an additional field @type which contains the type URL. Example:
package google.profile;
message Person {
string first_name = 1;
string last_name = 2;
}
{
"@type": "type.googleapis.com/google.profile.Person",
"firstName": <string>,
"lastName": <string>
}
If the embedded message type is well-known and has a custom JSON representation, that representation will be embedded adding a field value which holds the custom JSON in addition to the @type field. Example (for message Duration):
{
"@type": "type.googleapis.com/google.protobuf.Duration",
"value": "1.212s"
}
Instance Attribute Summary collapse
-
#type_url ⇒ String
A URL/resource name that uniquely identifies the type of the serialized protocol buffer message.
-
#value ⇒ String
Must be a valid serialized protocol buffer of the above specified type.