Fixes

build.gradle

 group 'pl.simmundi.trurl'
-version '1.5-SNAPSHOT'
+version 'main-SNAPSHOT'
 
 subprojects {
     apply plugin: 'java-library'

trurl-core/src/main/java/pl/edu/icm/trurl/ecs/Entity.java

@@ -17,6 +17,10 @@ public final class Entity {
         return session == null ? sessionIndex : session.getId(sessionIndex);
     }
 
+    int getSessionIndex() {
+        return sessionIndex;
+    }
+
     public <T> T get(Class<T> componentClass) {
         return session.get(componentClass, sessionIndex);
     }

trurl-core/src/main/java/pl/edu/icm/trurl/ecs/Session.java

@@ -35,6 +35,15 @@ public class Session {
         counter = 0;
     }
 
+    public <T> T getIfAvailable(int id, ComponentToken<T> token) {
+        Entity entity = idToEntity.get(id);
+        if (entity == null) {
+            return null;
+        } else {
+            return (T) components[token.index][entity.getSessionIndex()];
+        }
+    }
+
     public void flush() {
         flush(daoManager.allTokens());
     }