--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/template/TemplateParser.java	Mon Jul 01 20:58:32 2013 +0200
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.dsl.processor.template;
+
+import java.util.*;
+
+import javax.lang.model.element.*;
+import javax.lang.model.util.*;
+
+import com.oracle.truffle.dsl.processor.*;
+
+public abstract class TemplateParser<M extends Template> extends AbstractParser<M> {
+
+    public TemplateParser(ProcessorContext c) {
+        super(c);
+    }
+
+    protected void verifyExclusiveMethodAnnotation(Template template, Class<?>... annotationTypes) {
+        List<ExecutableElement> methods = ElementFilter.methodsIn(template.getTemplateType().getEnclosedElements());
+        for (ExecutableElement method : methods) {
+            List<AnnotationMirror> foundAnnotations = new ArrayList<>();
+            for (int i = 0; i < annotationTypes.length; i++) {
+                Class<?> annotationType = annotationTypes[i];
+                AnnotationMirror mirror = Utils.findAnnotationMirror(context.getEnvironment(), method, annotationType);
+                if (mirror != null) {
+                    foundAnnotations.add(mirror);
+                }
+            }
+            if (foundAnnotations.size() > 1) {
+                List<String> annotationNames = new ArrayList<>();
+                for (AnnotationMirror mirror : foundAnnotations) {
+                    annotationNames.add("@" + Utils.getSimpleName(mirror.getAnnotationType()));
+                }
+
+                template.addError("Non exclusive usage of annotations %s.", annotationNames);
+            }
+        }
+    }
+
+}