1 files changed, 35 insertions, 0 deletions

diff --git a/language-web/src/main/java/tools/refinery/language/web/xtext/servlet/SimpleSession.java b/language-web/src/main/java/tools/refinery/language/web/xtext/servlet/SimpleSession.java
new file mode 100644
index 00000000..09c055a2
--- /dev/null
+++ b/language-web/src/main/java/tools/refinery/language/web/xtext/servlet/SimpleSession.java
@@ -0,0 +1,35 @@
+package tools.refinery.language.web.xtext.servlet;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.eclipse.xtext.web.server.ISession;
+import org.eclipse.xtext.xbase.lib.Functions.Function0;
+
+public class SimpleSession implements ISession {
+        private Map<Object, Object> map = new HashMap<>();
+
+        @Override
+        public <T> T get(Object key) {
+                @SuppressWarnings("unchecked")
+                var value = (T) map.get(key);
+                return value;
+        }
+
+        @Override
+        public <T> T get(Object key, Function0<? extends T> factory) {
+                @SuppressWarnings("unchecked")
+                var value = (T) map.computeIfAbsent(key, absentKey -> factory.apply());
+                return value;
+        }
+
+        @Override
+        public void put(Object key, Object value) {
+                map.put(key, value);
+        }
+
+        @Override
+        public void remove(Object key) {
+                map.remove(key);
+        }
+}