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filters.clj
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filters.clj
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(ns clj-google-datastore.filters
(:require [clj-google-datastore.properties :refer [property-value]])
(:import (java.util Map)))
(def ^:private operators {= :EQUAL
< :LESS_THAN
<= :LESS_THAN_OR_EQUAL
> :GREATER_THAN
>= :GREATER_THAN_OR_EQUAL})
(defn- property-filter
[property-name operator value]
{:propertyFilter {:property {:name (name property-name)}
:op (operators operator)
:value (property-value value)}})
(defn- composite-filter
[filters]
{:compositeFilter {:op :AND
:filters (map #(let [property-value (val %)]
(if (map? property-value)
(composite-filter property-value)
(let [property-name (key %)]
(property-filter property-name
(first property-value)
(second property-value)))))
filters)}})
(defprotocol FilterProtocol
(get-filters [data]))
(extend-type Map
FilterProtocol
(get-filters [data] (let [count-data (count data)]
(cond
(= 1 count-data) (let [filter-data (first data)
property-name (first filter-data)
property-value (second filter-data)]
(property-filter property-name
(first property-value)
(second property-value)))
(< 1 count-data) (composite-filter data)))))