add variables support in GraphQLize resolver [GH-47]

Author: tamizhvendan

java/org/graphqlize/java/GraphQLResolver.java

@@ -1,5 +1,9 @@
 package org.graphqlize.java;
 
+import java.util.Map;
+
 public interface GraphQLResolver {
   String resolve(String query);
+
+  String resolve(String query, Map<String, Object> variables);
 }

java/org/graphqlize/java/GraphQLizeResolver.java

@@ -3,6 +3,7 @@
 import clojure.java.api.Clojure;
 import clojure.lang.IFn;
 import javax.sql.DataSource;
+import java.util.Map;
 
 public class GraphQLizeResolver implements GraphQLResolver {
   static {
@@ -21,4 +22,9 @@ public String resolve(String query) {
     return resolver.resolve(query);
   }
 
+  @Override
+  public String resolve(String query, Map<String, Object> variables) {
+    return resolver.resolve(query, variables);
+  }
+
 }

src/graphqlize/java_interop.clj

@@ -1,15 +1,19 @@
 (ns graphqlize.java-interop
   (:require [clojure.data.json :as json]
             [com.walmartlabs.lacinia :as lacinia]
+            [inflections.core :as inf]
             [graphqlize.lacinia.core :as gql-lacinia])
   (:import [org.graphqlize.java GraphQLResolver]
            [javax.sql DataSource]))
 
 (defn initialize [^DataSource db-spec]
   (let [lacinia-schema (gql-lacinia/schema db-spec)]
     (reify GraphQLResolver
-      (resolve [_ query]
-        (json/write-str (lacinia/execute lacinia-schema query nil nil))))))
+      (resolve [this query]
+        (.resolve this query nil))
+      (resolve [_ query variables]
+        (let [vs (inf/transform-keys (into {} variables) keyword)]
+          (json/write-str (lacinia/execute lacinia-schema query vs nil)))))))
 
 (comment
   (import '[org.postgresql.ds PGSimpleDataSource]