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use crate::aggregation::AggregationTrait;
use serde::ser::SerializeStruct;
use serde::{Serialize, Serializer};
use serde_json::{json, Value};
use std::collections::HashMap;
use crate::merge;
#[derive(Default)]
pub struct TopHitsAggregation {
name: String,
value: TopHitsValue,
aggregation: Value,
}
#[derive(Default)]
struct TopHitsValue {
script: String,
size: i64,
sort: Vec<(String, String)>,
}
impl TopHitsAggregation {
pub fn new(name: &str) -> Self {
let mut term = TopHitsAggregation {
name: name.to_string(),
..Default::default()
};
term.value.size = 10;
term
}
pub fn add_sort(mut self, field: &str, order: &str) -> Self {
self.value.sort.push((field.to_string(), order.to_string()));
self
}
pub fn set_size(mut self, size: i64) -> Self {
self.value.size = size;
self
}
pub fn set_script(mut self, script: &str) -> Self {
self.value.script = script.to_string();
self
}
pub fn set_aggregation<T>(mut self, aggregation: T) -> Self
where
T: AggregationTrait,
{
self.aggregation = aggregation.build();
self
}
pub fn append_aggregation<T>(mut self, query: T) -> Self
where
T: AggregationTrait,
{
let mut values = self.aggregation.clone();
merge(&mut values, &query.build());
self.aggregation = json!(values);
return self;
}
}
impl Serialize for TopHitsValue {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
let mut state = serializer.serialize_struct("TopHitsBuilder", 0)?;
if self.script.is_empty() {
state.serialize_field("size", &self.size)?;
if !self.sort.is_empty() {
let mut sort_map = HashMap::new();
for (field, order) in self.sort.iter() {
sort_map.insert(field.to_string(), order.to_string());
}
state.serialize_field("sort", &sort_map)?;
}
} else {
let mut source = HashMap::new();
source.insert("includes", self.script.clone());
state.serialize_field("_source", &source)?;
state.serialize_field("size", &self.size)?;
}
state.end()
}
}
impl Serialize for TopHitsAggregation {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
let mut state = serializer.serialize_struct("TopHitsAggregation", 0)?;
state.serialize_field("top_hits", &self.value)?;
if !(self.aggregation.is_null() || self.aggregation.to_string().is_empty()) {
state.serialize_field("aggs", &self.aggregation)?;
}
state.end()
}
}
impl AggregationTrait for TopHitsAggregation {
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 {
"top_hits".to_string()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::aggregation::AggregationTrait;
#[test]
fn test_terms_aggregation() {
let agg = TopHitsAggregation::new("hoge");
let json = agg.build();
println!("{}", json);
}
}