initial commit

.gitignore

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+.DS_Store
+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
+.settings/
+.project
+.classpath
+.idea/
+*.iml
+*.ipr
+*.iws

LICENSE

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README.md

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+# clj-hl7-fhir
+
+[HL7 FHIR](http://hl7.org/implement/standards/fhir/) JSON client.
+
+## Usage
+
+FIXME
+
+## License
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

project.clj

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+(defproject clj-hl7-fhir "0.1.0-SNAPSHOT"
+  :description "HL7 FHIR JSON client"
+  :url "https://github.com/gered/clj-hapi-fhir"
+  :license {:name "Apache License, Version 2.0"
+            :url "http://www.apache.org/licenses/LICENSE-2.0"}
+  :dependencies [[org.clojure/clojure "1.6.0"]
+                 [cheshire "5.3.1"]
+                 [clj-http "0.9.2"]
+                 [com.cemerick/url "0.1.1"]
+                 [camel-snake-kebab "0.1.5"]])

src/clj_hl7_fhir/core.clj

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+(ns clj-hl7-fhir.core
+  (:import (java.util Date))
+  (:require [clojure.string :as str]
+            [clj-http.client :as http]
+            [cheshire.core :as json])
+  (:use [camel-snake-kebab]
+        [clj-hl7-fhir.util]))
+
+(defn- ->fhir-resource-name [x]
+  (name (->CamelCase x)))
+
+(defn- fhir-get-request [base-url resource-url & [params]]
+  (let [query (cond
+                (seq? params) (->> params (concat [:_format "json"]) (kv-vector->query))
+                :else         (merge {:_format "json"} params))]
+    (-> (build-url base-url resource-url query)
+        (http/get)
+        :body
+        (json/parse-string true))))
+
+(defn- format-search-value [x]
+  (cond
+    (instance? Date x) (->iso-date x)
+    :else              x))
+
+(defn- make-search-param-name [parameter & [modifier]]
+  (keyword
+    (str
+      (name parameter)
+      (if modifier
+        (str ":" (name modifier))))))
+
+(defmacro single-search-op [name operator]
+  `(defn ~name [parameter# value# & {:keys [modifier#]}]
+     [(make-search-param-name parameter# modifier#)
+      (str (if-not (= "=" ~operator) ~operator)
+           (format-search-value value#))]))
+
+(defmacro double-search-op [name operator1 operator2]
+  `(defn ~name [parameter# value1# value2# & {:keys [modifier#]}]
+     [(make-search-param-name parameter# modifier#)
+      (str (if-not (= "=" ~operator1) ~operator1)
+           (format-search-value value1#))
+      (make-search-param-name parameter# modifier#)
+      (str (if-not (= "=" ~operator2) ~operator2)
+           (format-search-value value2#))]))
+
+(single-search-op eq "=")
+(single-search-op lt "<")
+(single-search-op lte "<=")
+(single-search-op gt ">")
+(single-search-op gte ">=")
+(double-search-op between ">" "<")
+
+(defn get-resource
+  "gets a single resource from a FHIR server. can optionally get a specific version of a resource.
+
+   reference:
+   read: http://hl7.org/implement/standards/fhir/http.html#read
+   vread: http://hl7.org/implement/standards/fhir/http.html#vread"
+  [base-url type id & {:keys [version]}]
+  (let [resource-name  (->fhir-resource-name type)
+        url-components (if version
+                         ["/" resource-name id "_history" version]
+                         ["/" resource-name id])]
+    (fhir-get-request
+      base-url
+      (apply join-paths url-components))))
+
+(defn search
+  "searches for resources on a FHIR server. multiple parameters are ANDed together. use of the search
+   operator helper functions is encouraged to ensure proper escaping/encoding of search parameters.
+
+   reference:
+   search: http://hl7.org/implement/standards/fhir/http.html#search"
+  [base-url type & params]
+  (let [resource-name  (->fhir-resource-name type)
+        url-components ["/" resource-name]]
+    (fhir-get-request
+      base-url
+      (apply join-paths url-components)
+      (apply concat params))))
+

src/clj_hl7_fhir/util.clj

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+(ns clj-hl7-fhir.util
+  (:import (java.util TimeZone Date)
+           (java.text SimpleDateFormat))
+  (:require [clojure.string :as str]
+            [cemerick.url :refer [url url-encode]]))
+
+(def tz (TimeZone/getDefault))
+(def iso8601 "yyyy-MM-dd'T'HH:mm:ssZZ")
+
+(defn ->iso-date
+  "returns an ISO8601 formatted date/time string for the given date. this is the format
+   which FHIR expects all date/times to be in"
+  [^Date date]
+  (if date
+    (let [df (SimpleDateFormat. iso8601)]
+      (.setTimeZone df tz)
+      (.format df date))))
+
+(defn kv-vector->query
+  "should really be using cemerick.url/map->query in all cases except when you need 2 values under the
+   name name in the query string (such as with FHIR's date 'between' search support)"
+  [kvs]
+  (some->> (partition 2 kvs)
+           (map (fn [[k v]]
+                  [(url-encode (name k))
+                   "="
+                   (url-encode (str v))]))
+           (interpose "&")
+           flatten
+           (apply str)))
+
+(defn join-paths [& paths]
+  (as-> paths x
+        (remove nil? x)
+        (str/join "/" x)
+        (str/replace x #"(/+)" "/")))
+
+(defn build-url [base-url path & [params]]
+  (-> (url base-url)
+      (update-in [:path] (fn [existing-path]
+                           (join-paths existing-path path)))
+      (assoc :query params)
+      (str)))

test/clj_hl7_fhir/core_test.clj

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+(ns clj-hl7-fhir.core-test
+  (:require [clojure.test :refer :all]
+            [clj-hl7-fhir.core :refer :all]))
+
+(deftest a-test
+  (testing "FIXME, I fail."
+    (is (= 0 1))))