Handle OptComponents.

- see #23

ragconnect.base/src/main/jastadd/Navigation.jrag

@@ -96,4 +96,9 @@ aspect Navigation {
 
   // --- rootTypeComponents ---
   syn JastAddList<MTypeComponent> MHandler.rootTypeComponents() = mragconnect().getRootTypeComponents();
+
+  // === for preprocessor ===
+  // --- isOptComponent ---
+  syn boolean TypeComponent.isOptComponent() = false;
+  eq OptComponent.isOptComponent() = true;
 }

ragconnect.base/src/main/jastadd/intermediate/Generation.jadd

@@ -62,12 +62,17 @@ aspect AttributesForMustache {
   syn String MEndpointDefinition.lastDefinitionToType() = lastDefinition().toType();
   syn String MEndpointDefinition.lastResult() = lastDefinition().outputVarName();
   syn String MEndpointDefinition.condition() {
+    // TODO probably, this has to be structured in a better way
     if (lastDefinition().mappingDef().getToType().isArray()) {
       return "java.util.Arrays.equals(" + preemptiveExpectedValue() + ", " + lastResult() + ")";
     }
     if (endpointDef().isTokenEndpointDefinition() && token().isPrimitiveType() && lastDefinition().mappingDef().getToType().isPrimitiveType()) {
       return preemptiveExpectedValue() + " == " + lastResult();
     }
+    if (endpointDef().isTypeEndpointDefinition() && type().isOptComponent()) {
+      // use "hasX()" instead of "getX() != null" for optionals
+      return "has" + typeName() + "()" + " && " + preemptiveExpectedValue() + ".equals(" + lastResult() + ")";
+    }
     if (lastDefinition().mappingDef().getToType().isPrimitiveType() || lastDefinition().mappingDef().isDefaultMappingDefinition()) {
       return preemptiveExpectedValue() + " != null && " + preemptiveExpectedValue() + ".equals(" + lastResult() + ")";
     }