public final class FieldMask extends GeneratedMessageV3 implements FieldMaskOrBuilder
`FieldMask` represents a set of symbolic field paths, for example:
paths: "f.a"
paths: "f.b.d"
Here `f` represents a field in some root message, `a` and `b`
fields in the message found in `f`, and `d` a field found in the
message in `f.b`.
Field masks are used to specify a subset of fields that should be
returned by a get operation or modified by an update operation.
Field masks also have a custom JSON encoding (see below).
# Field Masks in Projections
When used in the context of a projection, a response message or
sub-message is filtered by the API to only contain those fields as
specified in the mask. For example, if the mask in the previous
example is applied to a response message as follows:
f {
a : 22
b {
d : 1
x : 2
}
y : 13
}
z: 8
The result will not contain specific values for fields x,y and z
(their value will be set to the default, and omitted in proto text
output):
f {
a : 22
b {
d : 1
}
}
A repeated field is not allowed except at the last position of a
paths string.
If a FieldMask object is not present in a get operation, the
operation applies to all fields (as if a FieldMask of all fields
had been specified).
Note that a field mask does not necessarily apply to the
top-level response message. In case of a REST get operation, the
field mask applies directly to the response, but in case of a REST
list operation, the mask instead applies to each individual message
in the returned resource list. In case of a REST custom method,
other definitions may be used. Where the mask applies will be
clearly documented together with its declaration in the API. In
any case, the effect on the returned resource/resources is required
behavior for APIs.
# Field Masks in Update Operations
A field mask in update operations specifies which fields of the
targeted resource are going to be updated. The API is required
to only change the values of the fields as specified in the mask
and leave the others untouched. If a resource is passed in to
describe the updated values, the API ignores the values of all
fields not covered by the mask.
If a repeated field is specified for an update operation, the existing
repeated values in the target resource will be overwritten by the new values.
Note that a repeated field is only allowed in the last position of a `paths`
string.
If a sub-message is specified in the last position of the field mask for an
update operation, then the existing sub-message in the target resource is
overwritten. Given the target message:
f {
b {
d : 1
x : 2
}
c : 1
}
And an update message:
f {
b {
d : 10
}
}
then if the field mask is:
paths: "f.b"
then the result will be:
f {
b {
d : 10
}
c : 1
}
However, if the update mask was:
paths: "f.b.d"
then the result would be:
f {
b {
d : 10
x : 2
}
c : 1
}
In order to reset a field's value to the default, the field must
be in the mask and set to the default value in the provided resource.
Hence, in order to reset all fields of a resource, provide a default
instance of the resource and set all fields in the mask, or do
not provide a mask as described below.
If a field mask is not present on update, the operation applies to
all fields (as if a field mask of all fields has been specified).
Note that in the presence of schema evolution, this may mean that
fields the client does not know and has therefore not filled into
the request will be reset to their default. If this is unwanted
behavior, a specific service may require a client to always specify
a field mask, producing an error if not.
As with get operations, the location of the resource which
describes the updated values in the request message depends on the
operation kind. In any case, the effect of the field mask is
required to be honored by the API.
## Considerations for HTTP REST
The HTTP kind of an update operation which uses a field mask must
be set to PATCH instead of PUT in order to satisfy HTTP semantics
(PUT must only be used for full updates).
# JSON Encoding of Field Masks
In JSON, a field mask is encoded as a single string where paths are
separated by a comma. Fields name in each path are converted
to/from lower-camel naming conventions.
As an example, consider the following message declarations:
message Profile {
User user = 1;
Photo photo = 2;
}
message User {
string display_name = 1;
string address = 2;
}
In proto a field mask for `Profile` may look as such:
mask {
paths: "user.display_name"
paths: "photo"
}
In JSON, the same mask is represented as below:
{
mask: "user.displayName,photo"
}
# Field Masks and Oneof Fields
Field masks treat fields in oneofs just as regular fields. Consider the
following message:
message SampleMessage {
oneof test_oneof {
string name = 4;
SubMessage sub_message = 9;
}
}
The field mask can be:
mask {
paths: "name"
}
Or:
mask {
paths: "sub_message"
}
Note that oneof type names ("test_oneof" in this case) cannot be used in
paths.
## Field Mask Verification
The implementation of the all the API methods, which have any FieldMask type
field in the request, should verify the included field paths, and return
`INVALID_ARGUMENT` error if any path is duplicated or unmappable.
Protobuf type google.protobuf.FieldMask| Modifier and Type | Class and Description |
|---|---|
static class |
FieldMask.Builder
`FieldMask` represents a set of symbolic field paths, for example:
paths: "f.a"
paths: "f.b.d"
Here `f` represents a field in some root message, `a` and `b`
fields in the message found in `f`, and `d` a field found in the
message in `f.b`.
|
GeneratedMessageV3.BuilderParent, GeneratedMessageV3.ExtendableBuilder<MessageType extends GeneratedMessageV3.ExtendableMessage,BuilderType extends GeneratedMessageV3.ExtendableBuilder<MessageType,BuilderType>>, GeneratedMessageV3.ExtendableMessage<MessageType extends GeneratedMessageV3.ExtendableMessage>, GeneratedMessageV3.ExtendableMessageOrBuilder<MessageType extends GeneratedMessageV3.ExtendableMessage>, GeneratedMessageV3.FieldAccessorTable| Modifier and Type | Field and Description |
|---|---|
static int |
PATHS_FIELD_NUMBER |
alwaysUseFieldBuilders, unknownFieldsmemoizedSizememoizedHashCode| Modifier and Type | Method and Description |
|---|---|
boolean |
equals(Object obj)
Compares the specified object with this message for equality.
|
static FieldMask |
getDefaultInstance() |
FieldMask |
getDefaultInstanceForType()
Get an instance of the type with no fields set.
|
static Descriptors.Descriptor |
getDescriptor() |
Parser<FieldMask> |
getParserForType()
Gets the parser for a message of the same type as this message.
|
String |
getPaths(int index)
The set of field mask paths.
|
ByteString |
getPathsBytes(int index)
The set of field mask paths.
|
int |
getPathsCount()
The set of field mask paths.
|
ProtocolStringList |
getPathsList()
The set of field mask paths.
|
int |
getSerializedSize()
Get the number of bytes required to encode this message.
|
UnknownFieldSet |
getUnknownFields()
Get the
UnknownFieldSet for this message. |
int |
hashCode()
Returns the hash code value for this message.
|
protected GeneratedMessageV3.FieldAccessorTable |
internalGetFieldAccessorTable()
Get the FieldAccessorTable for this type.
|
boolean |
isInitialized()
Returns true if all required fields in the message and all embedded
messages are set, false otherwise.
|
static FieldMask.Builder |
newBuilder() |
static FieldMask.Builder |
newBuilder(FieldMask prototype) |
FieldMask.Builder |
newBuilderForType()
Constructs a new builder for a message of the same type as this message.
|
protected FieldMask.Builder |
newBuilderForType(GeneratedMessageV3.BuilderParent parent)
TODO(xiaofeng): remove this together with GeneratedMessageV3.BuilderParent.
|
static FieldMask |
parseDelimitedFrom(InputStream input) |
static FieldMask |
parseDelimitedFrom(InputStream input,
ExtensionRegistryLite extensionRegistry) |
static FieldMask |
parseFrom(byte[] data) |
static FieldMask |
parseFrom(byte[] data,
ExtensionRegistryLite extensionRegistry) |
static FieldMask |
parseFrom(ByteBuffer data) |
static FieldMask |
parseFrom(ByteBuffer data,
ExtensionRegistryLite extensionRegistry) |
static FieldMask |
parseFrom(ByteString data) |
static FieldMask |
parseFrom(ByteString data,
ExtensionRegistryLite extensionRegistry) |
static FieldMask |
parseFrom(CodedInputStream input) |
static FieldMask |
parseFrom(CodedInputStream input,
ExtensionRegistryLite extensionRegistry) |
static FieldMask |
parseFrom(InputStream input) |
static FieldMask |
parseFrom(InputStream input,
ExtensionRegistryLite extensionRegistry) |
static Parser<FieldMask> |
parser() |
FieldMask.Builder |
toBuilder()
Constructs a builder initialized with the current message.
|
void |
writeTo(CodedOutputStream output)
Serializes the message and writes it to
output. |
canUseUnsafe, computeStringSize, computeStringSizeNoTag, getAllFields, getDescriptorForType, getField, getOneofFieldDescriptor, getRepeatedField, getRepeatedFieldCount, hasField, hasOneof, internalGetMapField, makeExtensionsImmutable, newBuilderForType, parseDelimitedWithIOException, parseDelimitedWithIOException, parseUnknownField, parseUnknownFieldProto3, parseWithIOException, parseWithIOException, parseWithIOException, parseWithIOException, serializeBooleanMapTo, serializeIntegerMapTo, serializeLongMapTo, serializeStringMapTo, writeReplace, writeString, writeStringNoTagfindInitializationErrors, getInitializationErrorString, hashBoolean, hashEnum, hashEnumList, hashFields, hashLong, toStringaddAll, addAll, checkByteStringIsUtf8, toByteArray, toByteString, writeDelimitedTo, writeToclone, finalize, getClass, notify, notifyAll, wait, wait, waitfindInitializationErrors, getAllFields, getDescriptorForType, getField, getInitializationErrorString, getOneofFieldDescriptor, getRepeatedField, getRepeatedFieldCount, hasField, hasOneoftoByteArray, toByteString, writeDelimitedTo, writeTopublic static final int PATHS_FIELD_NUMBER
public final UnknownFieldSet getUnknownFields()
MessageOrBuilderUnknownFieldSet for this message.getUnknownFields in interface MessageOrBuildergetUnknownFields in class GeneratedMessageV3public static final Descriptors.Descriptor getDescriptor()
protected GeneratedMessageV3.FieldAccessorTable internalGetFieldAccessorTable()
GeneratedMessageV3internalGetFieldAccessorTable in class GeneratedMessageV3public ProtocolStringList getPathsList()
The set of field mask paths.
repeated string paths = 1;getPathsList in interface FieldMaskOrBuilderpublic int getPathsCount()
The set of field mask paths.
repeated string paths = 1;getPathsCount in interface FieldMaskOrBuilderpublic String getPaths(int index)
The set of field mask paths.
repeated string paths = 1;getPaths in interface FieldMaskOrBuilderpublic ByteString getPathsBytes(int index)
The set of field mask paths.
repeated string paths = 1;getPathsBytes in interface FieldMaskOrBuilderpublic final boolean isInitialized()
MessageLiteOrBuilderisInitialized in interface MessageLiteOrBuilderisInitialized in class GeneratedMessageV3public void writeTo(CodedOutputStream output) throws IOException
MessageLiteoutput. This does not
flush or close the stream.writeTo in interface MessageLitewriteTo in class GeneratedMessageV3IOExceptionpublic int getSerializedSize()
MessageLitegetSerializedSize in interface MessageLitegetSerializedSize in class GeneratedMessageV3public boolean equals(Object obj)
Messagetrue if the given object is a message of the same type (as
defined by getDescriptorForType()) and has identical values for
all of its fields. Subclasses must implement this; inheriting
Object.equals() is incorrect.equals in interface Messageequals in class AbstractMessageobj - object to be compared for equality with this messagetrue if the specified object is equal to this messagepublic int hashCode()
MessageObject.hashCode() is incorrect.hashCode in interface MessagehashCode in class AbstractMessageMap.hashCode()public static FieldMask parseFrom(ByteBuffer data) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(ByteString data) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(byte[] data) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry) throws InvalidProtocolBufferException
InvalidProtocolBufferExceptionpublic static FieldMask parseFrom(InputStream input) throws IOException
IOExceptionpublic static FieldMask parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry) throws IOException
IOExceptionpublic static FieldMask parseDelimitedFrom(InputStream input) throws IOException
IOExceptionpublic static FieldMask parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry) throws IOException
IOExceptionpublic static FieldMask parseFrom(CodedInputStream input) throws IOException
IOExceptionpublic static FieldMask parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry) throws IOException
IOExceptionpublic FieldMask.Builder newBuilderForType()
MessageLitenewBuilderForType in interface MessagenewBuilderForType in interface MessageLitepublic static FieldMask.Builder newBuilder()
public static FieldMask.Builder newBuilder(FieldMask prototype)
public FieldMask.Builder toBuilder()
MessageLitetoBuilder in interface MessagetoBuilder in interface MessageLiteprotected FieldMask.Builder newBuilderForType(GeneratedMessageV3.BuilderParent parent)
GeneratedMessageV3newBuilderForType in class GeneratedMessageV3public static FieldMask getDefaultInstance()
public Parser<FieldMask> getParserForType()
MessageLitegetParserForType in interface MessagegetParserForType in interface MessageLitegetParserForType in class GeneratedMessageV3public FieldMask getDefaultInstanceForType()
MessageLiteOrBuildergetDefaultInstance() method of generated message classes in that
this method is an abstract method of the MessageLite interface
whereas getDefaultInstance() is a static method of a specific
class. They return the same thing.getDefaultInstanceForType in interface MessageLiteOrBuildergetDefaultInstanceForType in interface MessageOrBuilderCopyright © 2008–2018. All rights reserved.