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use crate::aggregation::AggregationTrait;
use serde::ser::SerializeStruct;
use serde::{Serialize, Serializer};
use serde_json::{json, Value};
#[derive(Default)]
pub struct CardinalityAggregation {
name: String,
value: CardinalityValue,
}
#[derive(Default)]
struct CardinalityValue {
field: String,
}
impl CardinalityAggregation {
pub fn new(name: &str) -> Self {
CardinalityAggregation {
name: name.to_string(),
..Default::default()
}
}
pub fn set_field(mut self, field: &str) -> Self {
self.value.field = field.to_string();
self
}
}
impl Serialize for CardinalityValue {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
let mut state = serializer.serialize_struct("CardinalityValue", 0)?;
if !self.field.is_empty() {
state.serialize_field("field", &self.field)?;
}
state.end()
}
}
impl Serialize for CardinalityAggregation {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
let mut state = serializer.serialize_struct("CardinalityAggregation", 0)?;
state.serialize_field("cardinality", &self.value)?;
state.end()
}
}
impl AggregationTrait for CardinalityAggregation {
fn name(&self) -> &str {
self.name.as_str()
}
fn build(&self) -> Value {
let name = self.name.to_string();
json!({ name: self })
}
fn query_name(&self) -> String {
"sum".to_string()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::aggregation::AggregationTrait;
#[test]
fn test_terms_aggregation() {
let agg = CardinalityAggregation::new("hoge").set_field("id");
let json = agg.build();
println!("{}", json);
}
}