--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/FHIR/src/main/java/IOrthancConnection.java	Sat Oct 21 09:53:25 2023 +0200
@@ -0,0 +1,87 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Sebastien Jodogne, UCLouvain, Belgium
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/**
+ * Java plugin for Orthanc
+ * Copyright (C) 2023 Sebastien Jodogne, UCLouvain, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
+
+public interface IOrthancConnection {
+    public byte[] doGet(String uri,
+                        Map<String, String> parameters);
+
+    public byte[] doPost(String uri,
+                         byte[] body);
+
+    public static String formatGetParameters(Map<String, String> parameters) {
+        String result = "";
+
+        for (Map.Entry<String, String> entry : parameters.entrySet()) {
+            String item;
+            if (entry.getValue().isEmpty()) {
+                item = entry.getKey();
+            } else {
+                item = entry.getKey() + "=" + entry.getValue();
+            }
+
+            if (result.isEmpty()) {
+                result = "?" + item;
+            } else {
+                result = result + "&" + item;
+            }
+        }
+
+        return result;
+    }
+
+    public static JSONObject getJSONObject(IOrthancConnection orthanc,
+                                           String uri,
+                                           Map<String, String> parameters) {
+        byte[] a = orthanc.doGet(uri, parameters);
+        return new JSONObject(new String(a, StandardCharsets.UTF_8));
+    }
+
+    public static JSONArray getJSONArray(IOrthancConnection orthanc,
+                                         String uri,
+                                         Map<String, String> parameters) {
+        byte[] a = orthanc.doGet(uri, parameters);
+        return new JSONArray(new String(a, StandardCharsets.UTF_8));
+    }
+
+    public static boolean hasPluginInstalled(IOrthancConnection orthanc,
+                                             String plugin) {
+        Map<String, String> empty = new HashMap<>();
+        JSONArray plugins = IOrthancConnection.getJSONArray(orthanc, "/plugins", empty);
+
+        for (int i = 0; i < plugins.length(); i++) {
+            if (plugins.getString(i).equals(plugin)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}