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filters.go
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/
filters.go
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package filters
import (
"net/url"
"github.com/go-playground/form"
"github.com/olivere/elastic"
)
// ElasticFilter defines the Filter method which builds the ElasticSearch BoolQuery depending on url values
type ElasticFilter interface {
// Filter add new conditions to the BoolQuery from url
Filter(values url.Values, query *elastic.BoolQuery) error
}
// Aggregator is the registry of ElasticFilters
type Aggregator struct {
values url.Values
filters []ElasticFilter
}
// NewAggregator is the factory method of Aggregator
func NewAggregator(values url.Values, filters ...ElasticFilter) Aggregator {
return Aggregator{values: values, filters: filters}
}
// Filter calls all registered filters Filter methods
func (a Aggregator) Filter(query *elastic.BoolQuery) map[string]error {
errs := make(map[string]error)
for _, filter := range a.filters {
err := filter.Filter(a.values, query)
if err != nil {
if decodeErrors, ok := err.(form.DecodeErrors); ok {
return decodeErrors
}
errs["Bad Request"] = err
}
}
return errs
}