Package com.google.protobuf
Class FieldMask
java.lang.Object
com.google.protobuf.AbstractMessageLite
com.google.protobuf.AbstractMessage
com.google.protobuf.GeneratedMessageV3
com.google.protobuf.FieldMask
- All Implemented Interfaces:
FieldMaskOrBuilder
,com.google.protobuf.Message
,com.google.protobuf.MessageLite
,com.google.protobuf.MessageLiteOrBuilder
,com.google.protobuf.MessageOrBuilder
,Serializable
public final class FieldMask
extends com.google.protobuf.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, new values will be appended to the existing repeated field in the target resource. 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 new value will be merged into the existing sub-message in the target resource. For example, given the target message: f { b { d: 1 x: 2 } c: [1] } And an update message: f { b { d: 10 } c: [2] } then if the field mask is: paths: ["f.b", "f.c"] then the result will be: f { b { d: 10 x: 2 } c: [1, 2] } An implementation may provide options to override this default behavior for repeated and message fields. 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 any API method which has a FieldMask type field in the request should verify the included field paths, and return an `INVALID_ARGUMENT` error if any path is unmappable.Protobuf type
google.protobuf.FieldMask
- See Also:
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Nested Class Summary
Modifier and TypeClassDescriptionstatic final class
`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`.Nested classes/interfaces inherited from class com.google.protobuf.GeneratedMessageV3
com.google.protobuf.GeneratedMessageV3.BuilderParent, com.google.protobuf.GeneratedMessageV3.ExtendableBuilder<MessageType extends com.google.protobuf.GeneratedMessageV3.ExtendableMessage,
BuilderType extends com.google.protobuf.GeneratedMessageV3.ExtendableBuilder<MessageType, BuilderType>>, com.google.protobuf.GeneratedMessageV3.ExtendableMessage<MessageType extends com.google.protobuf.GeneratedMessageV3.ExtendableMessage>, com.google.protobuf.GeneratedMessageV3.ExtendableMessageOrBuilder<MessageType extends com.google.protobuf.GeneratedMessageV3.ExtendableMessage>, com.google.protobuf.GeneratedMessageV3.FieldAccessorTable, com.google.protobuf.GeneratedMessageV3.UnusedPrivateParameter Nested classes/interfaces inherited from class com.google.protobuf.AbstractMessageLite
com.google.protobuf.AbstractMessageLite.InternalOneOfEnum
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Field Summary
Fields inherited from class com.google.protobuf.GeneratedMessageV3
alwaysUseFieldBuilders, unknownFields
Fields inherited from class com.google.protobuf.AbstractMessage
memoizedSize
Fields inherited from class com.google.protobuf.AbstractMessageLite
memoizedHashCode
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Method Summary
Modifier and TypeMethodDescriptionboolean
static FieldMask
static final com.google.protobuf.Descriptors.Descriptor
com.google.protobuf.Parser<FieldMask>
getPaths
(int index) The set of field mask paths.com.google.protobuf.ByteString
getPathsBytes
(int index) The set of field mask paths.int
The set of field mask paths.com.google.protobuf.ProtocolStringList
The set of field mask paths.int
final com.google.protobuf.UnknownFieldSet
int
hashCode()
protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
final boolean
static FieldMask.Builder
static FieldMask.Builder
newBuilder
(FieldMask prototype) protected FieldMask.Builder
newBuilderForType
(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) protected Object
newInstance
(com.google.protobuf.GeneratedMessageV3.UnusedPrivateParameter unused) static FieldMask
parseDelimitedFrom
(InputStream input) static FieldMask
parseDelimitedFrom
(InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static FieldMask
parseFrom
(byte[] data) static FieldMask
parseFrom
(byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static FieldMask
parseFrom
(com.google.protobuf.ByteString data) static FieldMask
parseFrom
(com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static FieldMask
parseFrom
(com.google.protobuf.CodedInputStream input) static FieldMask
parseFrom
(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static FieldMask
parseFrom
(InputStream input) static FieldMask
parseFrom
(InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static FieldMask
parseFrom
(ByteBuffer data) static FieldMask
parseFrom
(ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) static com.google.protobuf.Parser<FieldMask>
parser()
void
writeTo
(com.google.protobuf.CodedOutputStream output) Methods inherited from class com.google.protobuf.GeneratedMessageV3
canUseUnsafe, computeStringSize, computeStringSizeNoTag, emptyBooleanList, emptyDoubleList, emptyFloatList, emptyIntList, emptyLongList, getAllFields, getDescriptorForType, getField, getOneofFieldDescriptor, getRepeatedField, getRepeatedFieldCount, hasField, hasOneof, internalGetMapField, isStringEmpty, makeExtensionsImmutable, mergeFromAndMakeImmutableInternal, mutableCopy, mutableCopy, mutableCopy, mutableCopy, mutableCopy, newBooleanList, newBuilderForType, newDoubleList, newFloatList, newIntList, newLongList, parseDelimitedWithIOException, parseDelimitedWithIOException, parseUnknownField, parseUnknownFieldProto3, parseWithIOException, parseWithIOException, parseWithIOException, parseWithIOException, serializeBooleanMapTo, serializeIntegerMapTo, serializeLongMapTo, serializeStringMapTo, writeReplace, writeString, writeStringNoTag
Methods inherited from class com.google.protobuf.AbstractMessage
findInitializationErrors, getInitializationErrorString, hashBoolean, hashEnum, hashEnumList, hashFields, hashLong, toString
Methods inherited from class com.google.protobuf.AbstractMessageLite
addAll, addAll, checkByteStringIsUtf8, toByteArray, toByteString, writeDelimitedTo, writeTo
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface com.google.protobuf.MessageLite
toByteArray, toByteString, writeDelimitedTo, writeTo
Methods inherited from interface com.google.protobuf.MessageOrBuilder
findInitializationErrors, getAllFields, getDescriptorForType, getField, getInitializationErrorString, getOneofFieldDescriptor, getRepeatedField, getRepeatedFieldCount, hasField, hasOneof
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Field Details
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PATHS_FIELD_NUMBER
public static final int PATHS_FIELD_NUMBER- See Also:
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Method Details
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newInstance
- Overrides:
newInstance
in classcom.google.protobuf.GeneratedMessageV3
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getUnknownFields
public final com.google.protobuf.UnknownFieldSet getUnknownFields()- Specified by:
getUnknownFields
in interfacecom.google.protobuf.MessageOrBuilder
- Overrides:
getUnknownFields
in classcom.google.protobuf.GeneratedMessageV3
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getDescriptor
public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() -
internalGetFieldAccessorTable
protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable internalGetFieldAccessorTable()- Specified by:
internalGetFieldAccessorTable
in classcom.google.protobuf.GeneratedMessageV3
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getPathsList
public com.google.protobuf.ProtocolStringList getPathsList()The set of field mask paths.
repeated string paths = 1;
- Specified by:
getPathsList
in interfaceFieldMaskOrBuilder
- Returns:
- A list containing the paths.
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getPathsCount
public int getPathsCount()The set of field mask paths.
repeated string paths = 1;
- Specified by:
getPathsCount
in interfaceFieldMaskOrBuilder
- Returns:
- The count of paths.
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getPaths
The set of field mask paths.
repeated string paths = 1;
- Specified by:
getPaths
in interfaceFieldMaskOrBuilder
- Parameters:
index
- The index of the element to return.- Returns:
- The paths at the given index.
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getPathsBytes
public com.google.protobuf.ByteString getPathsBytes(int index) The set of field mask paths.
repeated string paths = 1;
- Specified by:
getPathsBytes
in interfaceFieldMaskOrBuilder
- Parameters:
index
- The index of the value to return.- Returns:
- The bytes of the paths at the given index.
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isInitialized
public final boolean isInitialized()- Specified by:
isInitialized
in interfacecom.google.protobuf.MessageLiteOrBuilder
- Overrides:
isInitialized
in classcom.google.protobuf.GeneratedMessageV3
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writeTo
- Specified by:
writeTo
in interfacecom.google.protobuf.MessageLite
- Overrides:
writeTo
in classcom.google.protobuf.GeneratedMessageV3
- Throws:
IOException
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getSerializedSize
public int getSerializedSize()- Specified by:
getSerializedSize
in interfacecom.google.protobuf.MessageLite
- Overrides:
getSerializedSize
in classcom.google.protobuf.GeneratedMessageV3
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equals
- Specified by:
equals
in interfacecom.google.protobuf.Message
- Overrides:
equals
in classcom.google.protobuf.AbstractMessage
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hashCode
public int hashCode()- Specified by:
hashCode
in interfacecom.google.protobuf.Message
- Overrides:
hashCode
in classcom.google.protobuf.AbstractMessage
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parseFrom
public static FieldMask parseFrom(ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
public static FieldMask parseFrom(ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
public static FieldMask parseFrom(com.google.protobuf.ByteString data) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
public static FieldMask parseFrom(com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
public static FieldMask parseFrom(byte[] data) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
public static FieldMask parseFrom(byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException - Throws:
com.google.protobuf.InvalidProtocolBufferException
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parseFrom
- Throws:
IOException
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parseFrom
public static FieldMask parseFrom(InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws IOException - Throws:
IOException
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parseDelimitedFrom
- Throws:
IOException
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parseDelimitedFrom
public static FieldMask parseDelimitedFrom(InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws IOException - Throws:
IOException
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parseFrom
- Throws:
IOException
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parseFrom
public static FieldMask parseFrom(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws IOException - Throws:
IOException
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newBuilderForType
- Specified by:
newBuilderForType
in interfacecom.google.protobuf.Message
- Specified by:
newBuilderForType
in interfacecom.google.protobuf.MessageLite
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newBuilder
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newBuilder
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toBuilder
- Specified by:
toBuilder
in interfacecom.google.protobuf.Message
- Specified by:
toBuilder
in interfacecom.google.protobuf.MessageLite
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newBuilderForType
protected FieldMask.Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) - Specified by:
newBuilderForType
in classcom.google.protobuf.GeneratedMessageV3
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getDefaultInstance
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parser
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getParserForType
- Specified by:
getParserForType
in interfacecom.google.protobuf.Message
- Specified by:
getParserForType
in interfacecom.google.protobuf.MessageLite
- Overrides:
getParserForType
in classcom.google.protobuf.GeneratedMessageV3
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getDefaultInstanceForType
- Specified by:
getDefaultInstanceForType
in interfacecom.google.protobuf.MessageLiteOrBuilder
- Specified by:
getDefaultInstanceForType
in interfacecom.google.protobuf.MessageOrBuilder
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