Struct Metadata 

pub struct Metadata {
    pub fields: HashMap<String, MetadataValue>,
}

Metadata for an entity (key-value pairs)

Fields

fields: HashMap<String, MetadataValue>

The metadata fields

Implementations

impl Metadata

pub fn new() -> Self

Create empty metadata

pub fn with_fields(fields: HashMap<String, MetadataValue>) -> Self

Create with fields

pub fn set(&mut self, key: impl Into<String>, value: MetadataValue)

Set a field

pub fn get(&self, key: &str) -> Option<&MetadataValue>

Get a field

pub fn remove(&mut self, key: &str) -> Option<MetadataValue>

Remove a field

pub fn has(&self, key: &str) -> bool

Check if field exists

pub fn len(&self) -> usize

Number of fields

pub fn is_empty(&self) -> bool

Check if empty

pub fn iter(&self) -> impl Iterator<Item = (&String, &MetadataValue)>

Iterate over fields

pub fn matches_all(&self, filters: &[(String, MetadataFilter)]) -> bool

Check if metadata matches all filters

pub fn matches_any(&self, filters: &[(String, MetadataFilter)]) -> bool

Check if metadata matches any filter

pub fn merge(&mut self, other: Metadata)

Merge another metadata into this one

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metadata

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

Formats the value using the given formatter.

impl Default for Metadata

fn default() -> Metadata

Returns the “default value” for a type.