246 lines
8 KiB
Protocol Buffer
246 lines
8 KiB
Protocol Buffer
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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syntax = "proto3";
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package google.protobuf;
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option csharp_namespace = "Google.Protobuf.WellKnownTypes";
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option java_package = "com.google.protobuf";
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option java_outer_classname = "FieldMaskProto";
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option java_multiple_files = true;
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option objc_class_prefix = "GPB";
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option go_package = "google.golang.org/genproto/protobuf/field_mask;field_mask";
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option cc_enable_arenas = true;
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// `FieldMask` represents a set of symbolic field paths, for example:
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//
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// paths: "f.a"
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// paths: "f.b.d"
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//
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// Here `f` represents a field in some root message, `a` and `b`
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// fields in the message found in `f`, and `d` a field found in the
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// message in `f.b`.
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//
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// Field masks are used to specify a subset of fields that should be
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// returned by a get operation or modified by an update operation.
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// Field masks also have a custom JSON encoding (see below).
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//
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// # Field Masks in Projections
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//
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// When used in the context of a projection, a response message or
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// sub-message is filtered by the API to only contain those fields as
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// specified in the mask. For example, if the mask in the previous
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// example is applied to a response message as follows:
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//
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// f {
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// a : 22
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// b {
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// d : 1
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// x : 2
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// }
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// y : 13
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// }
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// z: 8
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//
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// The result will not contain specific values for fields x,y and z
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// (their value will be set to the default, and omitted in proto text
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// output):
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//
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//
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// f {
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// a : 22
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// b {
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// d : 1
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// }
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// }
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//
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// A repeated field is not allowed except at the last position of a
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// paths string.
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//
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// If a FieldMask object is not present in a get operation, the
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// operation applies to all fields (as if a FieldMask of all fields
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// had been specified).
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//
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// Note that a field mask does not necessarily apply to the
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// top-level response message. In case of a REST get operation, the
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// field mask applies directly to the response, but in case of a REST
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// list operation, the mask instead applies to each individual message
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// in the returned resource list. In case of a REST custom method,
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// other definitions may be used. Where the mask applies will be
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// clearly documented together with its declaration in the API. In
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// any case, the effect on the returned resource/resources is required
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// behavior for APIs.
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//
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// # Field Masks in Update Operations
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//
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// A field mask in update operations specifies which fields of the
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// targeted resource are going to be updated. The API is required
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// to only change the values of the fields as specified in the mask
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// and leave the others untouched. If a resource is passed in to
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// describe the updated values, the API ignores the values of all
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// fields not covered by the mask.
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//
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// If a repeated field is specified for an update operation, new values will
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// be appended to the existing repeated field in the target resource. Note that
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// a repeated field is only allowed in the last position of a `paths` string.
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//
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// If a sub-message is specified in the last position of the field mask for an
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// update operation, then new value will be merged into the existing sub-message
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// in the target resource.
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//
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// For example, given the target message:
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//
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// f {
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// b {
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// d: 1
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// x: 2
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// }
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// c: [1]
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// }
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//
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// And an update message:
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//
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// f {
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// b {
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// d: 10
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// }
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// c: [2]
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// }
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//
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// then if the field mask is:
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//
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// paths: ["f.b", "f.c"]
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//
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// then the result will be:
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//
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// f {
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// b {
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// d: 10
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// x: 2
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// }
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// c: [1, 2]
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// }
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//
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// An implementation may provide options to override this default behavior for
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// repeated and message fields.
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//
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// In order to reset a field's value to the default, the field must
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// be in the mask and set to the default value in the provided resource.
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// Hence, in order to reset all fields of a resource, provide a default
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// instance of the resource and set all fields in the mask, or do
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// not provide a mask as described below.
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//
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// If a field mask is not present on update, the operation applies to
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// all fields (as if a field mask of all fields has been specified).
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// Note that in the presence of schema evolution, this may mean that
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// fields the client does not know and has therefore not filled into
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// the request will be reset to their default. If this is unwanted
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// behavior, a specific service may require a client to always specify
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// a field mask, producing an error if not.
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//
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// As with get operations, the location of the resource which
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// describes the updated values in the request message depends on the
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// operation kind. In any case, the effect of the field mask is
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// required to be honored by the API.
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//
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// ## Considerations for HTTP REST
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//
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// The HTTP kind of an update operation which uses a field mask must
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// be set to PATCH instead of PUT in order to satisfy HTTP semantics
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// (PUT must only be used for full updates).
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//
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// # JSON Encoding of Field Masks
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//
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// In JSON, a field mask is encoded as a single string where paths are
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// separated by a comma. Fields name in each path are converted
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// to/from lower-camel naming conventions.
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//
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// As an example, consider the following message declarations:
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//
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// message Profile {
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// User user = 1;
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// Photo photo = 2;
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// }
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// message User {
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// string display_name = 1;
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// string address = 2;
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// }
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//
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// In proto a field mask for `Profile` may look as such:
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//
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// mask {
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// paths: "user.display_name"
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// paths: "photo"
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// }
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//
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// In JSON, the same mask is represented as below:
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//
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// {
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// mask: "user.displayName,photo"
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// }
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//
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// # Field Masks and Oneof Fields
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//
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// Field masks treat fields in oneofs just as regular fields. Consider the
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// following message:
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//
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// message SampleMessage {
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// oneof test_oneof {
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// string name = 4;
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// SubMessage sub_message = 9;
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// }
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// }
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//
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// The field mask can be:
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//
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// mask {
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// paths: "name"
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// }
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//
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// Or:
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//
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// mask {
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// paths: "sub_message"
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// }
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//
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// Note that oneof type names ("test_oneof" in this case) cannot be used in
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// paths.
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//
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// ## Field Mask Verification
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//
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// The implementation of any API method which has a FieldMask type field in the
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// request should verify the included field paths, and return an
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// `INVALID_ARGUMENT` error if any path is unmappable.
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message FieldMask {
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// The set of field mask paths.
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repeated string paths = 1;
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}
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