Enum JsonDeserializationError

#[non_exhaustive]
pub enum JsonDeserializationError {
    Serde(JsonError),
    ParseEscape(ParseEscape),
    RestrictedExpressionError(RestrictedExpressionError),
    ExpectedLiteralEntityRef(ExpectedLiteralEntityRef),
    ExpectedExtnValue(ExpectedExtnValue),
    ActionParentIsNotAction(ActionParentIsNotAction),
    MissingImpliedConstructor(MissingImpliedConstructor),
    DuplicateKey(DuplicateKey),
    EntityAttributeEvaluation(EntityAttrEvaluationError),
    EntitySchemaConformance(EntitySchemaConformanceError),
    UnexpectedRecordAttr(UnexpectedRecordAttr),
    MissingRequiredRecordAttr(MissingRequiredRecordAttr),
    TypeMismatch(TypeMismatch),
    ExprTag(Box<JsonDeserializationErrorContext>),
    Null(Box<JsonDeserializationErrorContext>),
    ReservedName(ReservedNameError),
    UnsupportedEntityTags,
}

Errors thrown during deserialization from JSON

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Serde(JsonError)

Error thrown by the serde_json crate

ParseEscape(ParseEscape)

Contents of an escape failed to parse.

RestrictedExpressionError(RestrictedExpressionError)

Restricted expression error

ExpectedLiteralEntityRef(ExpectedLiteralEntityRef)

A field that needs to be a literal entity reference, was some other JSON value

ExpectedExtnValue(ExpectedExtnValue)

A field that needs to be an extension value, was some other JSON value

ActionParentIsNotAction(ActionParentIsNotAction)

Parents of actions should be actions, but this action has a non-action parent

MissingImpliedConstructor(MissingImpliedConstructor)

Schema-based parsing needed an implicit extension constructor, but no suitable constructor was found

DuplicateKey(DuplicateKey)

The same key appears two or more times in a single record

EntityAttributeEvaluation(EntityAttrEvaluationError)

Error when evaluating an entity attribute

EntitySchemaConformance(EntitySchemaConformanceError)

During schema-based parsing, encountered an entity which does not conform to the schema.

This error contains the Entity analogues some of the other errors listed below, among other things.

UnexpectedRecordAttr(UnexpectedRecordAttr)

During schema-based parsing, encountered this attribute on a record, but that attribute shouldn’t exist on that record

MissingRequiredRecordAttr(MissingRequiredRecordAttr)

During schema-based parsing, didn’t encounter this attribute of a record, but that attribute should have existed

TypeMismatch(TypeMismatch)

During schema-based parsing, found a different type than the schema indicated.

(This is used in all cases except inside entity attributes; type mismatches in entity attributes are reported as Self::EntitySchemaConformance. As of this writing, that means this should only be used for schema-based parsing of the Context.)

ExprTag(Box<JsonDeserializationErrorContext>)

Raised when a JsonValue contains the no longer supported __expr escape

Null(Box<JsonDeserializationErrorContext>)

Raised when the input JSON contains a null

ReservedName(ReservedNameError)

Returned when a name contains __cedar

UnsupportedEntityTags

👎Deprecated since 4.2.0: entity-tags is now stable and fully supported, so this error never occurs

Never returned as of 4.2.0 (entity tags are now stable), but this error variant not removed because that would be a breaking change on this publicly-exported type.

Trait Implementations

impl Debug for JsonDeserializationError

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

Formats the value using the given formatter.

impl Diagnostic for JsonDeserializationError

fn code(&self) -> Option<Box<dyn Display + '_>>

Unique diagnostic code that can be used to look up more information about this Diagnostic. Ideally also globally unique, and documented in the toplevel crate’s documentation for easy searching. Rust path format (foo::bar::baz) is recommended, but more classic codes like E0123 or enums will work just fine.

fn help(&self) -> Option<Box<dyn Display + '_>>

Additional help text related to this Diagnostic. Do you have any advice for the poor soul who’s just run into this issue?

fn severity(&self) -> Option<Severity>

Diagnostic severity. This may be used by ReportHandlers to change the display format of this diagnostic.

fn labels(&self) -> Option<Box<dyn Iterator<Item = LabeledSpan> + '_>>

Labels to apply to this Diagnostic’s Diagnostic::source_code

fn source_code(&self) -> Option<&dyn SourceCode>

Source code to apply this Diagnostic’s Diagnostic::labels to.

fn related(&self) -> Option<Box<dyn Iterator<Item = &dyn Diagnostic> + '_>>

Additional related Diagnostics.

fn url(&self) -> Option<Box<dyn Display + '_>>

URL to visit for a more detailed explanation/help about this Diagnostic.

fn diagnostic_source(&self) -> Option<&dyn Diagnostic>

The cause of the error.

impl Display for JsonDeserializationError

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

Formats the value using the given formatter.

impl Error for JsonDeserializationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<EntityAttrEvaluationError> for JsonDeserializationError

fn from(source: EntityAttrEvaluationError) -> JsonDeserializationError

Converts to this type from the input type.

impl From<Error> for JsonDeserializationError

fn from(value: Error) -> JsonDeserializationError

Converts to this type from the input type.

impl From<JsonDeserializationError> for ContextJsonError

fn from(source: JsonDeserializationError) -> Self

Converts to this type from the input type.

impl From<JsonDeserializationError> for EntitiesError

fn from(source: JsonDeserializationError) -> EntitiesError

Converts to this type from the input type.

impl From<JsonError> for JsonDeserializationError

fn from(source: JsonError) -> JsonDeserializationError

Converts to this type from the input type.

impl From<ReservedNameError> for JsonDeserializationError

fn from(source: ReservedNameError) -> JsonDeserializationError

Converts to this type from the input type.

impl From<RestrictedExpressionError> for JsonDeserializationError

fn from(source: RestrictedExpressionError) -> JsonDeserializationError

Converts to this type from the input type.