More enum support

jdbcmapper/src/main/java/com/moparisthebest/jdbc/codegen/CompileTimeResultSetMapper.java

@@ -93,6 +93,10 @@ public class CompileTimeResultSetMapper {
 				toArray(w, keys, componentType, maxRows, cal, cleaner, reflectionFields);
 			} else if (types.isAssignable(returnTypeMirror, collectionType)) {
 				final List<? extends TypeMirror> typeArguments = ((DeclaredType) returnTypeMirror).getTypeArguments();
+				if(typeArguments.isEmpty()) {
+					JdbcMapperProcessor.getMessager().printMessage(Diagnostic.Kind.ERROR, "Collection type must have a generic type argument", eeMethod);
+					return true;
+				}
 				toCollection(w, keys, returnTypeMirror, typeArguments.get(0), maxRows, cal, cleaner, reflectionFields);
 			} else if (types.isAssignable(returnTypeMirror, mapType) && eeMethod.getAnnotation(JdbcMapper.SingleRow.class) == null) {
 				final List<? extends TypeMirror> typeArguments = ((DeclaredType) returnTypeMirror).getTypeArguments();

jdbcmapper/src/main/java/com/moparisthebest/jdbc/codegen/JdbcMapperProcessor.java

@@ -729,7 +729,7 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 		// we are going to put most common ones up top so it should execute faster normally
 		// todo: avoid string concat here
 		if (method == null)
-			if (o.getKind().isPrimitive() || types.isAssignable(o, stringType) || types.isAssignable(o, numberType)) {
+			if (o.getKind().isPrimitive() || types.isAssignable(o, stringType) || types.isAssignable(o, numberType) || types.isAssignable(o, enumType)) {
 				method = "Object";
 				// java.util.Date support, put it in a Timestamp
 			} else if (types.isAssignable(o, utilDateType)) {

jdbcmapper/src/main/java/com/moparisthebest/jdbc/codegen/SimpleSQLChecker.java

@@ -127,7 +127,7 @@ public class SimpleSQLChecker implements SQLChecker {
 		}
 		// end special behavior
 		// we are going to put most common ones up top so it should execute faster normally
-		if (types.isAssignable(o, stringType)) {
+		if (types.isAssignable(o, stringType) || types.isAssignable(o, enumType)) { // todo: hack for enum, might try to get one of the options? is it even possible?
 			return defaultString;
 		} else if (o.getKind().isPrimitive() || types.isAssignable(o, numberType)) {
 			switch (o.getKind()) {