Struct Part 

pub struct Part {
    pub text: Option<String>,
    pub raw: Option<String>,
    pub url: Option<String>,
    pub data: Option<Value>,
    pub metadata: Option<Value>,
    pub filename: Option<String>,
    pub media_type: Option<String>,
}

A2A Part (proto message Part) — a section of communication content. The content oneof is expressed without a discriminator: the active branch is exactly one of text / raw / url / data; the shared optional fields (metadata/filename/mediaType) ride alongside it. The oneof invariant is enforced at deserialization (via deserialize_part): a payload with zero content branches or more than one is rejected, matching the proto oneof semantics (spec §5.7 — a Part carries exactly one content branch). A struct (not an enum) lets serde handle the field-name-keyed shape directly while a custom deserializer validates the oneof invariant.

Fields

text: Option<String>

raw: Option<String>

base64-encoded bytes (proto bytes JSON form).

url: Option<String>

data: Option<Value>

metadata: Option<Value>

filename: Option<String>

media_type: Option<String>

Implementations

impl Part

pub fn text_str(s: impl Into<String>) -> Self

Construct a text part (the common MVP case).

pub fn as_text(&self) -> Option<&str>

The text payload of a text part, else None.

Trait Implementations

impl Clone for Part

fn clone(&self) -> Part

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Part

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Part

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Enforce the proto oneof content invariant: exactly one of text / raw / url / data must be present. Zero branches (empty Part) or multiple branches are rejected, matching proto oneof semantics (spec §5.7 — a Part carries exactly one content branch). {"data": null} is accepted: the data key is present, so the data branch is selected (proto3 oneof uses key presence, not value nullness).

impl JsonSchema for Part

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for Part

fn eq(&self, other: &Part) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Part

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Part