Package dev.cel.expr

Class Decl.FunctionDecl.Overload

java.lang.Object

com.google.protobuf.AbstractMessageLite

com.google.protobuf.AbstractMessage

com.google.protobuf.GeneratedMessageV3

dev.cel.expr.Decl.FunctionDecl.Overload

All Implemented Interfaces:

Message, MessageLite, MessageLiteOrBuilder, MessageOrBuilder, Decl.FunctionDecl.OverloadOrBuilder, java.io.Serializable

Enclosing class:

Decl.FunctionDecl

public static final class Decl.FunctionDecl.Overload
extends GeneratedMessageV3
implements Decl.FunctionDecl.OverloadOrBuilder

 An overload indicates a function's parameter types and return type, and
 may optionally include a function body described in terms of
 [Expr][cel.expr.Expr] values.
 Functions overloads are declared in either a function or method
 call-style. For methods, the `params[0]` is the expected type of the
 target receiver.
 Overloads must have non-overlapping argument types after erasure of all
 parameterized type variables (similar as type erasure in Java).
 

Protobuf type cel.expr.Decl.FunctionDecl.Overload

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Decl.FunctionDecl.Overload.Builder	An overload indicates a function's parameter types and return type, and may optionally include a function body described in terms of [Expr][cel.expr.Expr] values.

Nested classes/interfaces inherited from class com.google.protobuf.GeneratedMessageV3

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, GeneratedMessageV3.UnusedPrivateParameter

Nested classes/interfaces inherited from class com.google.protobuf.AbstractMessageLite

AbstractMessageLite.InternalOneOfEnum

Field Summary

Fields

Modifier and Type	Field	Description
static int	DOC_FIELD_NUMBER
static int	IS_INSTANCE_FUNCTION_FIELD_NUMBER
static int	OVERLOAD_ID_FIELD_NUMBER
static int	PARAMS_FIELD_NUMBER
static int	RESULT_TYPE_FIELD_NUMBER
static int	TYPE_PARAMS_FIELD_NUMBER

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

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)	Compares the specified object with this message for equality.
static Decl.FunctionDecl.Overload	getDefaultInstance()
Decl.FunctionDecl.Overload	getDefaultInstanceForType()	Get an instance of the type with no fields set.
static Descriptors.Descriptor	getDescriptor()
java.lang.String	getDoc()	Documentation string for the overload.
ByteString	getDocBytes()	Documentation string for the overload.
boolean	getIsInstanceFunction()	Whether the function is to be used in a method call-style `x.f(...)` of a function call-style `f(x, ...)`.
java.lang.String	getOverloadId()	Required.
ByteString	getOverloadIdBytes()	Required.
Type	getParams(int index)	List of function parameter [Type][cel.expr.Type] values.
int	getParamsCount()	List of function parameter [Type][cel.expr.Type] values.
java.util.List<Type>	getParamsList()	List of function parameter [Type][cel.expr.Type] values.
TypeOrBuilder	getParamsOrBuilder(int index)	List of function parameter [Type][cel.expr.Type] values.
java.util.List<? extends TypeOrBuilder>	getParamsOrBuilderList()	List of function parameter [Type][cel.expr.Type] values.
Parser<Decl.FunctionDecl.Overload>	getParserForType()	Gets the parser for a message of the same type as this message.
Type	getResultType()	Required.
TypeOrBuilder	getResultTypeOrBuilder()	Required.
int	getSerializedSize()	Get the number of bytes required to encode this message.
java.lang.String	getTypeParams(int index)	The type param names associated with the function declaration.
ByteString	getTypeParamsBytes(int index)	The type param names associated with the function declaration.
int	getTypeParamsCount()	The type param names associated with the function declaration.
ProtocolStringList	getTypeParamsList()	The type param names associated with the function declaration.
UnknownFieldSet	getUnknownFields()	Get the UnknownFieldSet for this message.
int	hashCode()	Returns the hash code value for this message.
boolean	hasResultType()	Required.
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 Decl.FunctionDecl.Overload.Builder	newBuilder()
static Decl.FunctionDecl.Overload.Builder	newBuilder(Decl.FunctionDecl.Overload prototype)
Decl.FunctionDecl.Overload.Builder	newBuilderForType()	Constructs a new builder for a message of the same type as this message.
protected Decl.FunctionDecl.Overload.Builder	newBuilderForType(GeneratedMessageV3.BuilderParent parent)	TODO(xiaofeng): remove this together with GeneratedMessageV3.BuilderParent.
protected java.lang.Object	newInstance(GeneratedMessageV3.UnusedPrivateParameter unused)	Creates a new instance of this message type.
static Decl.FunctionDecl.Overload	parseDelimitedFrom(java.io.InputStream input)
static Decl.FunctionDecl.Overload	parseDelimitedFrom(java.io.InputStream input, ExtensionRegistryLite extensionRegistry)
static Decl.FunctionDecl.Overload	parseFrom(byte[] data)
static Decl.FunctionDecl.Overload	parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
static Decl.FunctionDecl.Overload	parseFrom(ByteString data)
static Decl.FunctionDecl.Overload	parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
static Decl.FunctionDecl.Overload	parseFrom(CodedInputStream input)
static Decl.FunctionDecl.Overload	parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
static Decl.FunctionDecl.Overload	parseFrom(java.io.InputStream input)
static Decl.FunctionDecl.Overload	parseFrom(java.io.InputStream input, ExtensionRegistryLite extensionRegistry)
static Decl.FunctionDecl.Overload	parseFrom(java.nio.ByteBuffer data)
static Decl.FunctionDecl.Overload	parseFrom(java.nio.ByteBuffer data, ExtensionRegistryLite extensionRegistry)
static Parser<Decl.FunctionDecl.Overload>	parser()
Decl.FunctionDecl.Overload.Builder	toBuilder()	Constructs a builder initialized with the current message.
void	writeTo(CodedOutputStream output)	Serializes the message and writes it to 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

Field Detail

OVERLOAD_ID_FIELD_NUMBER

public static final int OVERLOAD_ID_FIELD_NUMBER

See Also:

Constant Field Values

PARAMS_FIELD_NUMBER

public static final int PARAMS_FIELD_NUMBER

See Also:

Constant Field Values

TYPE_PARAMS_FIELD_NUMBER

public static final int TYPE_PARAMS_FIELD_NUMBER

See Also:

Constant Field Values

RESULT_TYPE_FIELD_NUMBER

public static final int RESULT_TYPE_FIELD_NUMBER

See Also:

Constant Field Values

IS_INSTANCE_FUNCTION_FIELD_NUMBER

public static final int IS_INSTANCE_FUNCTION_FIELD_NUMBER

See Also:

Constant Field Values

DOC_FIELD_NUMBER

public static final int DOC_FIELD_NUMBER

See Also:

Constant Field Values

Method Detail

newInstance

protected java.lang.Object newInstance(GeneratedMessageV3.UnusedPrivateParameter unused)

Description copied from class: GeneratedMessageV3

Creates a new instance of this message type. Overridden in the generated code.

Overrides:

newInstance in class GeneratedMessageV3

getUnknownFields

public final UnknownFieldSet getUnknownFields()

Description copied from interface: MessageOrBuilder

Get the UnknownFieldSet for this message.

Specified by:

getUnknownFields in interface MessageOrBuilder

Overrides:

getUnknownFields in class GeneratedMessageV3

getDescriptor

public static final Descriptors.Descriptor getDescriptor()

internalGetFieldAccessorTable

protected GeneratedMessageV3.FieldAccessorTable internalGetFieldAccessorTable()

Description copied from class: GeneratedMessageV3

Get the FieldAccessorTable for this type. We can't have the message class pass this in to the constructor because of bootstrapping trouble with DescriptorProtos.

Specified by:

internalGetFieldAccessorTable in class GeneratedMessageV3

getOverloadId

public java.lang.String getOverloadId()

 Required. Globally unique overload name of the function which reflects
 the function name and argument types.
 This will be used by a [Reference][cel.expr.Reference] to
 indicate the `overload_id` that was resolved for the function `name`.
 

string overload_id = 1;

Specified by:

getOverloadId in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The overloadId.

getOverloadIdBytes

public ByteString getOverloadIdBytes()

 Required. Globally unique overload name of the function which reflects
 the function name and argument types.
 This will be used by a [Reference][cel.expr.Reference] to
 indicate the `overload_id` that was resolved for the function `name`.
 

string overload_id = 1;

Specified by:

getOverloadIdBytes in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The bytes for overloadId.

getParamsList

public java.util.List<Type> getParamsList()

 List of function parameter [Type][cel.expr.Type] values.
 Param types are disjoint after generic type parameters have been
 replaced with the type `DYN`. Since the `DYN` type is compatible with
 any other type, this means that if `A` is a type parameter, the
 function types `int<A>` and `int<int>` are not disjoint. Likewise,
 `map<string, string>` is not disjoint from `map<K, V>`.
 When the `result_type` of a function is a generic type param, the
 type param name also appears as the `type` of on at least one params.
 

repeated .cel.expr.Type params = 2;

Specified by:

getParamsList in interface Decl.FunctionDecl.OverloadOrBuilder

getParamsOrBuilderList

public java.util.List<? extends TypeOrBuilder> getParamsOrBuilderList()

 List of function parameter [Type][cel.expr.Type] values.
 Param types are disjoint after generic type parameters have been
 replaced with the type `DYN`. Since the `DYN` type is compatible with
 any other type, this means that if `A` is a type parameter, the
 function types `int<A>` and `int<int>` are not disjoint. Likewise,
 `map<string, string>` is not disjoint from `map<K, V>`.
 When the `result_type` of a function is a generic type param, the
 type param name also appears as the `type` of on at least one params.
 

repeated .cel.expr.Type params = 2;

Specified by:

getParamsOrBuilderList in interface Decl.FunctionDecl.OverloadOrBuilder

getParamsCount

public int getParamsCount()

 List of function parameter [Type][cel.expr.Type] values.
 Param types are disjoint after generic type parameters have been
 replaced with the type `DYN`. Since the `DYN` type is compatible with
 any other type, this means that if `A` is a type parameter, the
 function types `int<A>` and `int<int>` are not disjoint. Likewise,
 `map<string, string>` is not disjoint from `map<K, V>`.
 When the `result_type` of a function is a generic type param, the
 type param name also appears as the `type` of on at least one params.
 

repeated .cel.expr.Type params = 2;

Specified by:

getParamsCount in interface Decl.FunctionDecl.OverloadOrBuilder

getParams

public Type getParams(int index)

 List of function parameter [Type][cel.expr.Type] values.
 Param types are disjoint after generic type parameters have been
 replaced with the type `DYN`. Since the `DYN` type is compatible with
 any other type, this means that if `A` is a type parameter, the
 function types `int<A>` and `int<int>` are not disjoint. Likewise,
 `map<string, string>` is not disjoint from `map<K, V>`.
 When the `result_type` of a function is a generic type param, the
 type param name also appears as the `type` of on at least one params.
 

repeated .cel.expr.Type params = 2;

Specified by:

getParams in interface Decl.FunctionDecl.OverloadOrBuilder

getParamsOrBuilder

public TypeOrBuilder getParamsOrBuilder(int index)

 List of function parameter [Type][cel.expr.Type] values.
 Param types are disjoint after generic type parameters have been
 replaced with the type `DYN`. Since the `DYN` type is compatible with
 any other type, this means that if `A` is a type parameter, the
 function types `int<A>` and `int<int>` are not disjoint. Likewise,
 `map<string, string>` is not disjoint from `map<K, V>`.
 When the `result_type` of a function is a generic type param, the
 type param name also appears as the `type` of on at least one params.
 

repeated .cel.expr.Type params = 2;

Specified by:

getParamsOrBuilder in interface Decl.FunctionDecl.OverloadOrBuilder

getTypeParamsList

public ProtocolStringList getTypeParamsList()

 The type param names associated with the function declaration.
 For example, `function ex<K,V>(K key, map<K, V> map) : V` would yield
 the type params of `K, V`.
 

repeated string type_params = 3;

Specified by:

getTypeParamsList in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

A list containing the typeParams.

getTypeParamsCount

public int getTypeParamsCount()

 The type param names associated with the function declaration.
 For example, `function ex<K,V>(K key, map<K, V> map) : V` would yield
 the type params of `K, V`.
 

repeated string type_params = 3;

Specified by:

getTypeParamsCount in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The count of typeParams.

getTypeParams

public java.lang.String getTypeParams(int index)

 The type param names associated with the function declaration.
 For example, `function ex<K,V>(K key, map<K, V> map) : V` would yield
 the type params of `K, V`.
 

repeated string type_params = 3;

Specified by:

getTypeParams in interface Decl.FunctionDecl.OverloadOrBuilder

Parameters:

index - The index of the element to return.

Returns:

The typeParams at the given index.

getTypeParamsBytes

public ByteString getTypeParamsBytes(int index)

 The type param names associated with the function declaration.
 For example, `function ex<K,V>(K key, map<K, V> map) : V` would yield
 the type params of `K, V`.
 

repeated string type_params = 3;

Specified by:

getTypeParamsBytes in interface Decl.FunctionDecl.OverloadOrBuilder

Parameters:

index - The index of the value to return.

Returns:

The bytes of the typeParams at the given index.

hasResultType

public boolean hasResultType()

 Required. The result type of the function. For example, the operator
 `string.isEmpty()` would have `result_type` of `kind: BOOL`.
 

.cel.expr.Type result_type = 4;

Specified by:

hasResultType in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

Whether the resultType field is set.

getResultType

public Type getResultType()

 Required. The result type of the function. For example, the operator
 `string.isEmpty()` would have `result_type` of `kind: BOOL`.
 

.cel.expr.Type result_type = 4;

Specified by:

getResultType in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The resultType.

getResultTypeOrBuilder

public TypeOrBuilder getResultTypeOrBuilder()

 Required. The result type of the function. For example, the operator
 `string.isEmpty()` would have `result_type` of `kind: BOOL`.
 

.cel.expr.Type result_type = 4;

Specified by:

getResultTypeOrBuilder in interface Decl.FunctionDecl.OverloadOrBuilder

getIsInstanceFunction

public boolean getIsInstanceFunction()

 Whether the function is to be used in a method call-style `x.f(...)`
 of a function call-style `f(x, ...)`.
 For methods, the first parameter declaration, `params[0]` is the
 expected type of the target receiver.
 

bool is_instance_function = 5;

Specified by:

getIsInstanceFunction in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The isInstanceFunction.

getDoc

public java.lang.String getDoc()

 Documentation string for the overload.
 

string doc = 6;

Specified by:

getDoc in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The doc.

getDocBytes

public ByteString getDocBytes()

 Documentation string for the overload.
 

string doc = 6;

Specified by:

getDocBytes in interface Decl.FunctionDecl.OverloadOrBuilder

Returns:

The bytes for doc.

isInitialized

public final boolean isInitialized()

Description copied from interface: MessageLiteOrBuilder

Returns true if all required fields in the message and all embedded messages are set, false otherwise.

See also: MessageOrBuilder.getInitializationErrorString()

Specified by:

isInitialized in interface MessageLiteOrBuilder

Overrides:

isInitialized in class GeneratedMessageV3

writeTo

public void writeTo(CodedOutputStream output)
             throws java.io.IOException

Description copied from interface: MessageLite

Serializes the message and writes it to output. This does not flush or close the stream.

Specified by:

writeTo in interface MessageLite

Overrides:

writeTo in class GeneratedMessageV3

Throws:

java.io.IOException

getSerializedSize

public int getSerializedSize()

Description copied from interface: MessageLite

Get the number of bytes required to encode this message. The result is only computed on the first call and memoized after that. If this message requires more than Integer.MAX_VALUE bytes to encode, the return value will be smaller than the actual number of bytes required and might be negative.

Specified by:

getSerializedSize in interface MessageLite

Overrides:

getSerializedSize in class GeneratedMessageV3

equals

public boolean equals(java.lang.Object obj)

Description copied from interface: Message

Compares the specified object with this message for equality. Returns true 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.

Specified by:

equals in interface Message

Overrides:

equals in class AbstractMessage

Parameters:

obj - object to be compared for equality with this message

Returns:

true if the specified object is equal to this message

hashCode

public int hashCode()

Description copied from interface: Message

Returns the hash code value for this message. The hash code of a message should mix the message's type (object identity of the descriptor) with its contents (known and unknown field values). Subclasses must implement this; inheriting Object.hashCode() is incorrect.

Specified by:

hashCode in interface Message

Overrides:

hashCode in class AbstractMessage

Returns:

the hash code value for this message

See Also:

Map.hashCode()

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(java.nio.ByteBuffer data)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(java.nio.ByteBuffer data,
                                                   ExtensionRegistryLite extensionRegistry)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(ByteString data)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(ByteString data,
                                                   ExtensionRegistryLite extensionRegistry)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(byte[] data)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(byte[] data,
                                                   ExtensionRegistryLite extensionRegistry)
                                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(java.io.InputStream input)
                                            throws java.io.IOException

Throws:

java.io.IOException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(java.io.InputStream input,
                                                   ExtensionRegistryLite extensionRegistry)
                                            throws java.io.IOException

Throws:

java.io.IOException

parseDelimitedFrom

public static Decl.FunctionDecl.Overload parseDelimitedFrom(java.io.InputStream input)
                                                     throws java.io.IOException

Throws:

java.io.IOException

parseDelimitedFrom

public static Decl.FunctionDecl.Overload parseDelimitedFrom(java.io.InputStream input,
                                                            ExtensionRegistryLite extensionRegistry)
                                                     throws java.io.IOException

Throws:

java.io.IOException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(CodedInputStream input)
                                            throws java.io.IOException

Throws:

java.io.IOException

parseFrom

public static Decl.FunctionDecl.Overload parseFrom(CodedInputStream input,
                                                   ExtensionRegistryLite extensionRegistry)
                                            throws java.io.IOException

Throws:

java.io.IOException

newBuilderForType

public Decl.FunctionDecl.Overload.Builder newBuilderForType()

Description copied from interface: MessageLite

Constructs a new builder for a message of the same type as this message.

Specified by:

newBuilderForType in interface Message

Specified by:

newBuilderForType in interface MessageLite

newBuilder

public static Decl.FunctionDecl.Overload.Builder newBuilder()

newBuilder

public static Decl.FunctionDecl.Overload.Builder newBuilder(Decl.FunctionDecl.Overload prototype)

toBuilder

public Decl.FunctionDecl.Overload.Builder toBuilder()

Description copied from interface: MessageLite

Constructs a builder initialized with the current message. Use this to derive a new message from the current one.

Specified by:

toBuilder in interface Message

Specified by:

toBuilder in interface MessageLite

newBuilderForType

protected Decl.FunctionDecl.Overload.Builder newBuilderForType(GeneratedMessageV3.BuilderParent parent)

Description copied from class: GeneratedMessageV3

TODO(xiaofeng): remove this together with GeneratedMessageV3.BuilderParent.

Specified by:

newBuilderForType in class GeneratedMessageV3

getDefaultInstance

public static Decl.FunctionDecl.Overload getDefaultInstance()

parser

public static Parser<Decl.FunctionDecl.Overload> parser()

getParserForType

public Parser<Decl.FunctionDecl.Overload> getParserForType()

Description copied from interface: MessageLite

Gets the parser for a message of the same type as this message.

Specified by:

getParserForType in interface Message

Specified by:

getParserForType in interface MessageLite

Overrides:

getParserForType in class GeneratedMessageV3

getDefaultInstanceForType

public Decl.FunctionDecl.Overload getDefaultInstanceForType()

Description copied from interface: MessageLiteOrBuilder

Get an instance of the type with no fields set. Because no fields are set, all getters for singular fields will return default values and repeated fields will appear empty. This may or may not be a singleton. This differs from the getDefaultInstance() 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.

Specified by:

getDefaultInstanceForType in interface MessageLiteOrBuilder

Specified by:

getDefaultInstanceForType in interface MessageOrBuilder