--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/parser/TemplateMethodParser.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,142 @@
+/*
+ * 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.parser;
+
+import java.lang.annotation.*;
+import java.util.*;
+
+import javax.lang.model.element.*;
+import javax.lang.model.type.*;
+import javax.lang.model.util.*;
+
+import com.oracle.truffle.dsl.processor.*;
+import com.oracle.truffle.dsl.processor.java.*;
+import com.oracle.truffle.dsl.processor.model.*;
+
+public abstract class TemplateMethodParser<T extends Template, E extends TemplateMethod> {
+
+    protected final T template;
+    private final ProcessorContext context;
+    private final MethodSpecParser parser;
+
+    private boolean parseNullOnError;
+
+    public TemplateMethodParser(ProcessorContext context, T template) {
+        this.template = template;
+        this.context = context;
+        this.parser = new MethodSpecParser(template);
+    }
+
+    public void setParseNullOnError(boolean parseNullOnError) {
+        this.parseNullOnError = parseNullOnError;
+    }
+
+    public boolean isParseNullOnError() {
+        return parseNullOnError;
+    }
+
+    public MethodSpecParser getParser() {
+        return parser;
+    }
+
+    public ProcessorContext getContext() {
+        return context;
+    }
+
+    public TypeSystemData getTypeSystem() {
+        return template.getTypeSystem();
+    }
+
+    public abstract MethodSpec createSpecification(ExecutableElement method, AnnotationMirror mirror);
+
+    public abstract E create(TemplateMethod method, boolean invalid);
+
+    public abstract boolean isParsable(ExecutableElement method);
+
+    public Class<? extends Annotation> getAnnotationType() {
+        return null;
+    }
+
+    public final List<E> parse(List<? extends Element> elements) {
+        List<ExecutableElement> methods = new ArrayList<>();
+        methods.addAll(ElementFilter.methodsIn(elements));
+
+        List<E> parsedMethods = new ArrayList<>();
+        boolean valid = true;
+        int naturalOrder = 0;
+        for (ExecutableElement method : methods) {
+            if (!isParsable(method)) {
+                continue;
+            }
+
+            Class<? extends Annotation> annotationType = getAnnotationType();
+            AnnotationMirror mirror = null;
+            if (annotationType != null) {
+                mirror = ElementUtils.findAnnotationMirror(getContext().getEnvironment(), method, annotationType);
+            }
+
+            E parsedMethod = parse(naturalOrder, method, mirror);
+
+            if (method.getModifiers().contains(Modifier.PRIVATE) && parser.isEmitErrors()) {
+                parsedMethod.addError("Method annotated with @%s must not be private.", getAnnotationType().getSimpleName());
+                parsedMethods.add(parsedMethod);
+                valid = false;
+                continue;
+            }
+
+            if (parsedMethod != null) {
+                parsedMethods.add(parsedMethod);
+            } else {
+                valid = false;
+            }
+            naturalOrder++;
+        }
+        Collections.sort(parsedMethods);
+
+        if (!valid && isParseNullOnError()) {
+            return null;
+        }
+        return parsedMethods;
+    }
+
+    private E parse(int naturalOrder, ExecutableElement method, AnnotationMirror annotation) {
+        MethodSpec methodSpecification = createSpecification(method, annotation);
+        if (methodSpecification == null) {
+            return null;
+        }
+
+        TemplateMethod templateMethod = parser.parse(methodSpecification, method, annotation, naturalOrder);
+        if (templateMethod != null) {
+            return create(templateMethod, templateMethod.hasErrors());
+        }
+        return null;
+    }
+
+    public final E create(String id, int naturalOrder, ExecutableElement methodMetadata, AnnotationMirror mirror, TypeMirror returnType, List<VariableElement> parameterTypes) {
+        TemplateMethod method = parser.parseImpl(createSpecification(methodMetadata, mirror), naturalOrder, id, methodMetadata, mirror, returnType, parameterTypes);
+        if (method != null) {
+            return create(method, method.hasErrors());
+        }
+        return null;
+    }
+}