--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/java/ElementUtils.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,1256 @@
+/*
+ * 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.java;
+
+import java.io.*;
+import java.lang.annotation.*;
+import java.util.*;
+
+import javax.annotation.processing.*;
+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.model.*;
+import com.oracle.truffle.dsl.processor.java.model.CodeTypeMirror.DeclaredCodeTypeMirror;
+
+/**
+ * THIS IS NOT PUBLIC API.
+ */
+public class ElementUtils {
+
+    public static TypeMirror getType(ProcessingEnvironment processingEnv, Class<?> element) {
+        if (element.isArray()) {
+            return processingEnv.getTypeUtils().getArrayType(getType(processingEnv, element.getComponentType()));
+        }
+        if (element.isPrimitive()) {
+            if (element == void.class) {
+                return processingEnv.getTypeUtils().getNoType(TypeKind.VOID);
+            }
+            TypeKind typeKind;
+            if (element == boolean.class) {
+                typeKind = TypeKind.BOOLEAN;
+            } else if (element == byte.class) {
+                typeKind = TypeKind.BYTE;
+            } else if (element == short.class) {
+                typeKind = TypeKind.SHORT;
+            } else if (element == char.class) {
+                typeKind = TypeKind.CHAR;
+            } else if (element == int.class) {
+                typeKind = TypeKind.INT;
+            } else if (element == long.class) {
+                typeKind = TypeKind.LONG;
+            } else if (element == float.class) {
+                typeKind = TypeKind.FLOAT;
+            } else if (element == double.class) {
+                typeKind = TypeKind.DOUBLE;
+            } else {
+                assert false;
+                return null;
+            }
+            return processingEnv.getTypeUtils().getPrimitiveType(typeKind);
+        } else {
+            TypeElement typeElement = processingEnv.getElementUtils().getTypeElement(element.getCanonicalName());
+            if (typeElement == null) {
+                return null;
+            }
+            return typeElement.asType();
+        }
+    }
+
+    public static ExecutableElement findExecutableElement(DeclaredType type, String name) {
+        List<? extends ExecutableElement> elements = ElementFilter.methodsIn(type.asElement().getEnclosedElements());
+        for (ExecutableElement executableElement : elements) {
+            if (executableElement.getSimpleName().toString().equals(name)) {
+                return executableElement;
+            }
+        }
+        return null;
+    }
+
+    public static boolean needsCastTo(TypeMirror sourceType, TypeMirror targetType) {
+        if (typeEquals(sourceType, targetType)) {
+            return false;
+        } else if (isObject(targetType)) {
+            return false;
+        } else if (isVoid(targetType)) {
+            return false;
+        } else if (isAssignable(sourceType, targetType)) {
+            return false;
+        }
+        return true;
+    }
+
+    public static String createReferenceName(ExecutableElement method) {
+        StringBuilder b = new StringBuilder();
+
+        b.append(method.getSimpleName().toString());
+        b.append("(");
+
+        String sep = "";
+        for (VariableElement parameter : method.getParameters()) {
+            b.append(sep);
+            b.append(ElementUtils.getSimpleName(parameter.asType()));
+            sep = ", ";
+        }
+
+        b.append(")");
+        return b.toString();
+    }
+
+    public static TypeMirror boxType(ProcessorContext context, TypeMirror primitiveType) {
+        if (primitiveType == null) {
+            return null;
+        }
+        TypeMirror boxedType = primitiveType;
+        if (boxedType.getKind().isPrimitive()) {
+            boxedType = context.getEnvironment().getTypeUtils().boxedClass((PrimitiveType) boxedType).asType();
+        }
+        return boxedType;
+    }
+
+    public static DeclaredType getDeclaredType(TypeElement typeElem, TypeMirror... typeArgs) {
+        return new DeclaredCodeTypeMirror(typeElem, Arrays.asList(typeArgs));
+    }
+
+    public static List<AnnotationMirror> collectAnnotations(ProcessorContext context, AnnotationMirror markerAnnotation, String elementName, Element element,
+                    Class<? extends Annotation> annotationClass) {
+        List<AnnotationMirror> result = new ArrayList<>();
+        if (markerAnnotation != null) {
+            result.addAll(ElementUtils.getAnnotationValueList(AnnotationMirror.class, markerAnnotation, elementName));
+        }
+        AnnotationMirror explicit = ElementUtils.findAnnotationMirror(context.getEnvironment(), element, annotationClass);
+        if (explicit != null) {
+            result.add(explicit);
+        }
+        return result;
+    }
+
+    public static TypeMirror getCommonSuperType(ProcessorContext context, Collection<TypeMirror> types) {
+        if (types.isEmpty()) {
+            return context.getType(Object.class);
+        }
+        Iterator<TypeMirror> typesIterator = types.iterator();
+        TypeMirror prev = typesIterator.next();
+        while (typesIterator.hasNext()) {
+            prev = getCommonSuperType(context, prev, typesIterator.next());
+        }
+        return prev;
+    }
+
+    private static TypeMirror getCommonSuperType(ProcessorContext context, TypeMirror type1, TypeMirror type2) {
+        if (typeEquals(type1, type2)) {
+            return type1;
+        }
+        if (isVoid(type1)) {
+            return type2;
+        } else if (isVoid(type2)) {
+            return type1;
+        }
+        if (isObject(type1)) {
+            return type1;
+        } else if (isObject(type2)) {
+            return type2;
+        }
+
+        if (isPrimitive(type1) || isPrimitive(type2)) {
+            return context.getType(Object.class);
+        }
+
+        if (isSubtype(type1, type2)) {
+            return type2;
+        } else if (isSubtype(type2, type1)) {
+            return type1;
+        }
+
+        TypeElement element1 = fromTypeMirror(type1);
+        TypeElement element2 = fromTypeMirror(type2);
+
+        if (element1 == null || element2 == null) {
+            return context.getType(Object.class);
+        }
+
+        List<TypeElement> element1Types = getSuperTypes(element1);
+        List<TypeElement> element2Types = getSuperTypes(element2);
+
+        for (TypeElement superType1 : element1Types) {
+            for (TypeElement superType2 : element2Types) {
+                if (typeEquals(superType1.asType(), superType2.asType())) {
+                    return superType2.asType();
+                }
+            }
+        }
+
+        return context.getType(Object.class);
+    }
+
+    public static String getReadableSignature(ExecutableElement method) {
+        StringBuilder builder = new StringBuilder();
+        builder.append(method.getSimpleName().toString());
+        builder.append("(");
+        String sep = "";
+        for (VariableElement var : method.getParameters()) {
+            builder.append(sep);
+            builder.append(getSimpleName(var.asType()));
+            sep = ", ";
+        }
+        builder.append(")");
+        return builder.toString();
+    }
+
+    public static boolean hasError(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+            case BYTE:
+            case CHAR:
+            case DOUBLE:
+            case FLOAT:
+            case INT:
+            case SHORT:
+            case LONG:
+            case DECLARED:
+            case VOID:
+            case TYPEVAR:
+                return false;
+            case ARRAY:
+                return hasError(((ArrayType) mirror).getComponentType());
+            case ERROR:
+                return true;
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    public static boolean isSubtypeBoxed(ProcessorContext context, TypeMirror from, TypeMirror to) {
+        return isSubtype(boxType(context, from), boxType(context, to));
+    }
+
+    public static boolean isSubtype(TypeMirror type1, TypeMirror type2) {
+        if (type1 instanceof CodeTypeMirror || type2 instanceof CodeTypeMirror) {
+            throw new UnsupportedOperationException();
+        }
+        return ProcessorContext.getInstance().getEnvironment().getTypeUtils().isSubtype(type1, type2);
+    }
+
+    public static boolean isAssignable(TypeMirror from, TypeMirror to) {
+        if (typeEquals(from, to)) {
+            return true;
+        } else if (isVoid(to)) {
+            return true;
+        } else if (isObject(to)) {
+            return true;
+        }
+        ProcessorContext context = ProcessorContext.getInstance();
+        if (!(from instanceof CodeTypeMirror) && !(to instanceof CodeTypeMirror)) {
+            return context.getEnvironment().getTypeUtils().isAssignable(context.reloadType(from), context.reloadType(to));
+        } else {
+            return isAssignableImpl(from, to);
+        }
+    }
+
+    private static boolean isAssignableImpl(TypeMirror from, TypeMirror to) {
+        // JLS 5.1.1 identity conversion
+        if (ElementUtils.typeEquals(from, to)) {
+            return true;
+        }
+
+        if (isObject(to)) {
+            return true;
+        }
+
+        // JLS 5.1.2 widening primitives
+        if (ElementUtils.isPrimitive(from) && ElementUtils.isPrimitive(to)) {
+            TypeKind fromKind = from.getKind();
+            TypeKind toKind = to.getKind();
+            switch (fromKind) {
+                case BYTE:
+                    switch (toKind) {
+                        case SHORT:
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case SHORT:
+                    switch (toKind) {
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case CHAR:
+                    switch (toKind) {
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case INT:
+                    switch (toKind) {
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case LONG:
+                    switch (toKind) {
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case FLOAT:
+                    switch (toKind) {
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+
+            }
+            return false;
+        } else if (ElementUtils.isPrimitive(from) || ElementUtils.isPrimitive(to)) {
+            return false;
+        }
+
+        if (from instanceof ArrayType && to instanceof ArrayType) {
+            return isAssignable(((ArrayType) from).getComponentType(), ((ArrayType) to).getComponentType());
+        }
+
+        if (from instanceof ArrayType || to instanceof ArrayType) {
+            return false;
+        }
+
+        TypeElement fromType = ElementUtils.fromTypeMirror(from);
+        TypeElement toType = ElementUtils.fromTypeMirror(to);
+        if (fromType == null || toType == null) {
+            return false;
+        }
+        // JLS 5.1.6 narrowing reference conversion
+
+        List<TypeElement> superTypes = ElementUtils.getSuperTypes(fromType);
+        for (TypeElement superType : superTypes) {
+            if (ElementUtils.typeEquals(superType.asType(), to)) {
+                return true;
+            }
+        }
+
+        // TODO more spec
+        return false;
+    }
+
+    public static Set<Modifier> modifiers(Modifier... modifier) {
+        return new LinkedHashSet<>(Arrays.asList(modifier));
+    }
+
+    public static String getTypeId(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "Boolean";
+            case BYTE:
+                return "Byte";
+            case CHAR:
+                return "Char";
+            case DOUBLE:
+                return "Double";
+            case FLOAT:
+                return "Float";
+            case SHORT:
+                return "Short";
+            case INT:
+                return "Int";
+            case LONG:
+                return "Long";
+            case DECLARED:
+                return fixECJBinaryNameIssue(((DeclaredType) mirror).asElement().getSimpleName().toString());
+            case ARRAY:
+                return getTypeId(((ArrayType) mirror).getComponentType()) + "Array";
+            case VOID:
+                return "Void";
+            case NULL:
+                return "Null";
+            case WILDCARD:
+                StringBuilder b = new StringBuilder();
+                WildcardType type = (WildcardType) mirror;
+                if (type.getExtendsBound() != null) {
+                    b.append("Extends").append(getTypeId(type.getExtendsBound()));
+                } else if (type.getSuperBound() != null) {
+                    b.append("Super").append(getTypeId(type.getExtendsBound()));
+                }
+                return b.toString();
+            case TYPEVAR:
+                return "Any";
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    public static String getSimpleName(TypeElement element) {
+        return getSimpleName(element.asType());
+    }
+
+    public static String getSimpleName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "boolean";
+            case BYTE:
+                return "byte";
+            case CHAR:
+                return "char";
+            case DOUBLE:
+                return "double";
+            case FLOAT:
+                return "float";
+            case SHORT:
+                return "short";
+            case INT:
+                return "int";
+            case LONG:
+                return "long";
+            case DECLARED:
+                return getDeclaredName((DeclaredType) mirror, true);
+            case ARRAY:
+                return getSimpleName(((ArrayType) mirror).getComponentType()) + "[]";
+            case VOID:
+                return "void";
+            case NULL:
+                return "null";
+            case WILDCARD:
+                return getWildcardName((WildcardType) mirror);
+            case TYPEVAR:
+                return "?";
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    private static String getWildcardName(WildcardType type) {
+        StringBuilder b = new StringBuilder();
+        if (type.getExtendsBound() != null) {
+            b.append("? extends ").append(getSimpleName(type.getExtendsBound()));
+        } else if (type.getSuperBound() != null) {
+            b.append("? super ").append(getSimpleName(type.getExtendsBound()));
+        }
+        return b.toString();
+    }
+
+    public static String getDeclaredName(DeclaredType element, boolean includeTypeVariables) {
+        String simpleName = fixECJBinaryNameIssue(element.asElement().getSimpleName().toString());
+
+        if (!includeTypeVariables || element.getTypeArguments().size() == 0) {
+            return simpleName;
+        }
+
+        StringBuilder b = new StringBuilder(simpleName);
+        b.append("<");
+        if (element.getTypeArguments().size() > 0) {
+            for (int i = 0; i < element.getTypeArguments().size(); i++) {
+                b.append(getSimpleName(element.getTypeArguments().get(i)));
+                if (i < element.getTypeArguments().size() - 1) {
+                    b.append(", ");
+                }
+            }
+        }
+        b.append(">");
+        return b.toString();
+    }
+
+    public static String fixECJBinaryNameIssue(String name) {
+        if (name.contains("$")) {
+            int lastIndex = name.lastIndexOf('$');
+            return name.substring(lastIndex + 1, name.length());
+        }
+        return name;
+    }
+
+    public static String getQualifiedName(TypeElement element) {
+        String qualifiedName = element.getQualifiedName().toString();
+        if (qualifiedName.contains("$")) {
+            /*
+             * If a class gets loaded in its binary form by the ECJ compiler it fails to produce the
+             * proper canonical class name. It leaves the $ in the qualified name of the class. So
+             * one instance of a TypeElement may be loaded in binary and one in source form. The
+             * current type comparison in #typeEquals compares by the qualified name so the
+             * qualified name must match. This is basically a hack to fix the returned qualified
+             * name of eclipse.
+             */
+            qualifiedName = qualifiedName.replace('$', '.');
+        }
+        return qualifiedName;
+    }
+
+    public static String getQualifiedName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "boolean";
+            case BYTE:
+                return "byte";
+            case CHAR:
+                return "char";
+            case DOUBLE:
+                return "double";
+            case SHORT:
+                return "short";
+            case FLOAT:
+                return "float";
+            case INT:
+                return "int";
+            case LONG:
+                return "long";
+            case DECLARED:
+                return getQualifiedName(fromTypeMirror(mirror));
+            case ARRAY:
+                return getQualifiedName(((ArrayType) mirror).getComponentType());
+            case VOID:
+                return "void";
+            case NULL:
+                return "null";
+            case TYPEVAR:
+                return getSimpleName(mirror);
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            case EXECUTABLE:
+                return ((ExecutableType) mirror).toString();
+            case NONE:
+                return "$none";
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror + " mirror: " + mirror);
+        }
+    }
+
+    public static boolean isVoid(TypeMirror mirror) {
+        return mirror != null && mirror.getKind() == TypeKind.VOID;
+    }
+
+    public static boolean isPrimitive(TypeMirror mirror) {
+        return mirror != null && mirror.getKind().isPrimitive();
+    }
+
+    public static List<String> getQualifiedSuperTypeNames(TypeElement element) {
+        List<TypeElement> types = getSuperTypes(element);
+        List<String> qualifiedNames = new ArrayList<>();
+        for (TypeElement type : types) {
+            qualifiedNames.add(getQualifiedName(type));
+        }
+        return qualifiedNames;
+    }
+
+    public static List<TypeElement> getDeclaredTypes(TypeElement element) {
+        return ElementFilter.typesIn(element.getEnclosedElements());
+    }
+
+    public static boolean isEnclosedIn(Element enclosedIn, Element element) {
+        if (element == null) {
+            return false;
+        } else if (typeEquals(enclosedIn.asType(), element.asType())) {
+            return true;
+        } else {
+            return isEnclosedIn(enclosedIn, element.getEnclosingElement());
+        }
+    }
+
+    public static TypeElement findRootEnclosingType(Element element) {
+        List<Element> elements = getElementHierarchy(element);
+
+        for (int i = elements.size() - 1; i >= 0; i--) {
+            if (elements.get(i).getKind().isClass()) {
+                return (TypeElement) elements.get(i);
+            }
+        }
+
+        return null;
+    }
+
+    public static List<Element> getElementHierarchy(Element e) {
+        List<Element> elements = new ArrayList<>();
+        elements.add(e);
+
+        Element enclosing = e.getEnclosingElement();
+        while (enclosing != null && enclosing.getKind() != ElementKind.PACKAGE) {
+            elements.add(enclosing);
+            enclosing = enclosing.getEnclosingElement();
+        }
+        if (enclosing != null) {
+            elements.add(enclosing);
+        }
+        return elements;
+    }
+
+    public static TypeElement findNearestEnclosingType(Element element) {
+        List<Element> elements = getElementHierarchy(element);
+        for (Element e : elements) {
+            if (e.getKind().isClass() || e.getKind().isInterface()) {
+                return (TypeElement) e;
+            }
+        }
+        return null;
+    }
+
+    public static List<TypeElement> getDirectSuperTypes(TypeElement element) {
+        List<TypeElement> types = new ArrayList<>();
+        TypeElement superElement = getSuperType(element);
+        if (superElement != null) {
+            types.add(superElement);
+            types.addAll(getDirectSuperTypes(superElement));
+        }
+
+        return types;
+    }
+
+    /**
+     * Gets the element representing the {@linkplain TypeElement#getSuperclass() super class} of a
+     * given type element.
+     */
+    public static TypeElement getSuperType(TypeElement element) {
+        if (element.getSuperclass() != null) {
+            return fromTypeMirror(element.getSuperclass());
+        }
+        return null;
+    }
+
+    public static List<TypeElement> getSuperTypes(TypeElement element) {
+        List<TypeElement> types = new ArrayList<>();
+        List<TypeElement> superTypes = null;
+        List<TypeElement> superInterfaces = null;
+        TypeElement superElement = getSuperType(element);
+        if (superElement != null) {
+            types.add(superElement);
+            superTypes = getSuperTypes(superElement);
+        }
+        for (TypeMirror interfaceMirror : element.getInterfaces()) {
+            TypeElement interfaceElement = fromTypeMirror(interfaceMirror);
+            if (interfaceElement != null) {
+                types.add(interfaceElement);
+                if (superInterfaces == null) {
+                    superInterfaces = getSuperTypes(interfaceElement);
+                } else {
+                    superInterfaces.addAll(getSuperTypes(interfaceElement));
+                }
+            }
+        }
+
+        if (superTypes != null) {
+            types.addAll(superTypes);
+        }
+
+        if (superInterfaces != null) {
+            types.addAll(superInterfaces);
+        }
+
+        return types;
+    }
+
+    public static String getPackageName(TypeElement element) {
+        return findPackageElement(element).getQualifiedName().toString();
+    }
+
+    public static String getEnclosedQualifiedName(DeclaredType mirror) {
+        Element e = ((TypeElement) mirror.asElement()).getEnclosingElement();
+        if (e.getKind() == ElementKind.PACKAGE) {
+            return ((PackageElement) e).getQualifiedName().toString();
+        } else if (e.getKind().isInterface() || e.getKind().isClass()) {
+            return getQualifiedName((TypeElement) e);
+        } else {
+            return null;
+        }
+    }
+
+    public static String getPackageName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+            case BYTE:
+            case CHAR:
+            case DOUBLE:
+            case FLOAT:
+            case SHORT:
+            case INT:
+            case LONG:
+            case VOID:
+            case NULL:
+            case TYPEVAR:
+                return null;
+            case DECLARED:
+                PackageElement pack = findPackageElement(fromTypeMirror(mirror));
+                if (pack == null) {
+                    throw new IllegalArgumentException("No package element found for declared type " + getSimpleName(mirror));
+                }
+                return pack.getQualifiedName().toString();
+            case ARRAY:
+                return getSimpleName(((ArrayType) mirror).getComponentType());
+            case EXECUTABLE:
+                return null;
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind());
+        }
+    }
+
+    public static String createConstantName(String simpleName) {
+        // TODO use camel case to produce underscores.
+        return simpleName.toString().toUpperCase();
+    }
+
+    public static TypeElement fromTypeMirror(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case DECLARED:
+                return (TypeElement) ((DeclaredType) mirror).asElement();
+            case ARRAY:
+                return fromTypeMirror(((ArrayType) mirror).getComponentType());
+            default:
+                return null;
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T> List<T> getAnnotationValueList(Class<T> expectedListType, AnnotationMirror mirror, String name) {
+        List<? extends AnnotationValue> values = getAnnotationValue(List.class, mirror, name);
+        List<T> result = new ArrayList<>();
+
+        if (values != null) {
+            for (AnnotationValue value : values) {
+                T annotationValue = resolveAnnotationValue(expectedListType, value);
+                if (annotationValue != null) {
+                    result.add(annotationValue);
+                }
+            }
+        }
+        return result;
+    }
+
+    public static <T> T getAnnotationValue(Class<T> expectedType, AnnotationMirror mirror, String name) {
+        return resolveAnnotationValue(expectedType, getAnnotationValue(mirror, name));
+    }
+
+    @SuppressWarnings({"unchecked"})
+    private static <T> T resolveAnnotationValue(Class<T> expectedType, AnnotationValue value) {
+        if (value == null) {
+            return null;
+        }
+
+        Object unboxedValue = value.accept(new AnnotationValueVisitorImpl(), null);
+        if (unboxedValue != null) {
+            if (expectedType == TypeMirror.class && unboxedValue instanceof String) {
+                return null;
+            }
+            if (!expectedType.isAssignableFrom(unboxedValue.getClass())) {
+                throw new ClassCastException(unboxedValue.getClass().getName() + " not assignable from " + expectedType.getName());
+            }
+        }
+        return (T) unboxedValue;
+    }
+
+    public static AnnotationValue getAnnotationValue(AnnotationMirror mirror, String name) {
+        ExecutableElement valueMethod = null;
+        for (ExecutableElement method : ElementFilter.methodsIn(mirror.getAnnotationType().asElement().getEnclosedElements())) {
+            if (method.getSimpleName().toString().equals(name)) {
+                valueMethod = method;
+                break;
+            }
+        }
+
+        if (valueMethod == null) {
+            return null;
+        }
+
+        AnnotationValue value = mirror.getElementValues().get(valueMethod);
+        if (value == null) {
+            value = valueMethod.getDefaultValue();
+        }
+
+        return value;
+    }
+
+    private static class AnnotationValueVisitorImpl extends AbstractAnnotationValueVisitor7<Object, Void> {
+
+        @Override
+        public Object visitBoolean(boolean b, Void p) {
+            return Boolean.valueOf(b);
+        }
+
+        @Override
+        public Object visitByte(byte b, Void p) {
+            return Byte.valueOf(b);
+        }
+
+        @Override
+        public Object visitChar(char c, Void p) {
+            return c;
+        }
+
+        @Override
+        public Object visitDouble(double d, Void p) {
+            return d;
+        }
+
+        @Override
+        public Object visitFloat(float f, Void p) {
+            return f;
+        }
+
+        @Override
+        public Object visitInt(int i, Void p) {
+            return i;
+        }
+
+        @Override
+        public Object visitLong(long i, Void p) {
+            return i;
+        }
+
+        @Override
+        public Object visitShort(short s, Void p) {
+            return s;
+        }
+
+        @Override
+        public Object visitString(String s, Void p) {
+            return s;
+        }
+
+        @Override
+        public Object visitType(TypeMirror t, Void p) {
+            return t;
+        }
+
+        @Override
+        public Object visitEnumConstant(VariableElement c, Void p) {
+            return c;
+        }
+
+        @Override
+        public Object visitAnnotation(AnnotationMirror a, Void p) {
+            return a;
+        }
+
+        @Override
+        public Object visitArray(List<? extends AnnotationValue> vals, Void p) {
+            return vals;
+        }
+
+    }
+
+    public static String printException(Throwable e) {
+        StringWriter string = new StringWriter();
+        PrintWriter writer = new PrintWriter(string);
+        e.printStackTrace(writer);
+        writer.flush();
+        string.flush();
+        return e.getMessage() + "\r\n" + string.toString();
+    }
+
+    public static AnnotationMirror findAnnotationMirror(ProcessingEnvironment processingEnv, Element element, Class<?> annotationClass) {
+        return findAnnotationMirror(processingEnv, element.getAnnotationMirrors(), annotationClass);
+    }
+
+    public static AnnotationMirror findAnnotationMirror(ProcessingEnvironment processingEnv, List<? extends AnnotationMirror> mirrors, Class<?> annotationClass) {
+        TypeElement expectedAnnotationType = processingEnv.getElementUtils().getTypeElement(annotationClass.getCanonicalName());
+        return findAnnotationMirror(mirrors, expectedAnnotationType.asType());
+    }
+
+    public static AnnotationMirror findAnnotationMirror(List<? extends AnnotationMirror> mirrors, TypeElement expectedAnnotationType) {
+        return findAnnotationMirror(mirrors, expectedAnnotationType.asType());
+    }
+
+    public static AnnotationMirror findAnnotationMirror(List<? extends AnnotationMirror> mirrors, TypeMirror expectedAnnotationType) {
+        for (AnnotationMirror mirror : mirrors) {
+            if (typeEquals(mirror.getAnnotationType(), expectedAnnotationType)) {
+                return mirror;
+            }
+        }
+        return null;
+    }
+
+    public static PackageElement findPackageElement(Element type) {
+        List<Element> hierarchy = getElementHierarchy(type);
+        for (Element element : hierarchy) {
+            if (element.getKind() == ElementKind.PACKAGE) {
+                return (PackageElement) element;
+            }
+        }
+        return null;
+    }
+
+    public static String firstLetterUpperCase(String name) {
+        if (name == null || name.isEmpty()) {
+            return name;
+        }
+        return Character.toUpperCase(name.charAt(0)) + name.substring(1, name.length());
+    }
+
+    public static String firstLetterLowerCase(String name) {
+        if (name == null || name.isEmpty()) {
+            return name;
+        }
+        return Character.toLowerCase(name.charAt(0)) + name.substring(1, name.length());
+    }
+
+    private static ExecutableElement getDeclaredMethod(TypeElement element, String name, TypeMirror[] params) {
+        List<ExecutableElement> methods = ElementFilter.methodsIn(element.getEnclosedElements());
+        method: for (ExecutableElement method : methods) {
+            if (!method.getSimpleName().toString().equals(name)) {
+                continue;
+            }
+            if (method.getParameters().size() != params.length) {
+                continue;
+            }
+            for (int i = 0; i < params.length; i++) {
+                TypeMirror param1 = params[i];
+                TypeMirror param2 = method.getParameters().get(i).asType();
+                if (param1.getKind() != TypeKind.TYPEVAR && param2.getKind() != TypeKind.TYPEVAR) {
+                    if (!getQualifiedName(param1).equals(getQualifiedName(param2))) {
+                        continue method;
+                    }
+                }
+            }
+            return method;
+        }
+        return null;
+    }
+
+    public static boolean isDeclaredMethodInSuperType(TypeElement element, String name, TypeMirror[] params) {
+        return !getDeclaredMethodsInSuperTypes(element, name, params).isEmpty();
+    }
+
+    /**
+     * Gets the methods in the super type hierarchy (excluding interfaces) that are overridden by a
+     * method in a subtype.
+     *
+     * @param declaringElement the subtype element declaring the method
+     * @param name the name of the method
+     * @param params the signature of the method
+     */
+    public static List<ExecutableElement> getDeclaredMethodsInSuperTypes(TypeElement declaringElement, String name, TypeMirror... params) {
+        List<ExecutableElement> superMethods = new ArrayList<>();
+        List<TypeElement> superElements = getSuperTypes(declaringElement);
+
+        for (TypeElement superElement : superElements) {
+            ExecutableElement superMethod = getDeclaredMethod(superElement, name, params);
+            if (superMethod != null) {
+                superMethods.add(superMethod);
+            }
+        }
+        return superMethods;
+    }
+
+    public static boolean typeEquals(TypeMirror type1, TypeMirror type2) {
+        if (type1 == type2) {
+            return true;
+        } else if (type1 == null || type2 == null) {
+            return false;
+        } else {
+            if (type1.getKind() == type2.getKind()) {
+                return getUniqueIdentifier(type1).equals(getUniqueIdentifier(type2));
+            } else {
+                return false;
+            }
+        }
+    }
+
+    public static boolean areTypesCompatible(TypeMirror type1, TypeMirror type2) {
+        if (typeEquals(type1, type2)) {
+            return true;
+        } else if (kindIsIntegral(type1.getKind())) {
+            return kindIsIntegral(type2.getKind());
+        } else if (type1.getKind() == TypeKind.NULL) {
+            if (type2.getKind() == TypeKind.NULL) {
+                return false;
+            }
+            return true;
+        } else if (type2.getKind() == TypeKind.NULL) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private static boolean kindIsIntegral(TypeKind kind) {
+        return kind == TypeKind.BYTE || kind == TypeKind.SHORT || kind == TypeKind.INT || kind == TypeKind.LONG;
+    }
+
+    public static List<String> getUniqueIdentifiers(List<TypeMirror> typeMirror) {
+        List<String> ids = new ArrayList<>();
+        for (TypeMirror type : typeMirror) {
+            ids.add(getUniqueIdentifier(type));
+        }
+        return ids;
+    }
+
+    public static String getUniqueIdentifier(TypeMirror typeMirror) {
+        if (typeMirror.getKind() == TypeKind.ARRAY) {
+            return getUniqueIdentifier(((ArrayType) typeMirror).getComponentType()) + "[]";
+        } else {
+            return getQualifiedName(typeMirror);
+        }
+    }
+
+    public static int compareByTypeHierarchy(TypeMirror t1, TypeMirror t2) {
+        if (typeEquals(t1, t2)) {
+            return 0;
+        }
+        Set<String> t1SuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(t1)));
+        if (t1SuperSet.contains(getQualifiedName(t2))) {
+            return -1;
+        }
+
+        Set<String> t2SuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(t2)));
+        if (t2SuperSet.contains(getQualifiedName(t1))) {
+            return 1;
+        }
+        return 0;
+    }
+
+    public static boolean canThrowType(List<? extends TypeMirror> thrownTypes, TypeMirror exceptionType) {
+        if (ElementUtils.containsType(thrownTypes, exceptionType)) {
+            return true;
+        }
+
+        if (isRuntimeException(exceptionType)) {
+            return true;
+        }
+
+        // search for any super types
+        for (TypeElement typeElement : getSuperTypes(fromTypeMirror(exceptionType))) {
+            if (ElementUtils.containsType(thrownTypes, typeElement.asType())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static void setVisibility(Set<Modifier> modifiers, Modifier visibility) {
+        Modifier current = getVisibility(modifiers);
+        if (current != visibility) {
+            if (current != null) {
+                modifiers.remove(current);
+            }
+            if (visibility != null) {
+                modifiers.add(visibility);
+            }
+        }
+    }
+
+    public static Modifier getVisibility(Set<Modifier> modifier) {
+        for (Modifier mod : modifier) {
+            if (mod == Modifier.PUBLIC || mod == Modifier.PRIVATE || mod == Modifier.PROTECTED) {
+                return mod;
+            }
+        }
+        return null;
+    }
+
+    private static boolean isRuntimeException(TypeMirror type) {
+        Set<String> typeSuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(type)));
+        return typeSuperSet.contains(RuntimeException.class.getCanonicalName()) || getQualifiedName(type).equals(RuntimeException.class.getCanonicalName());
+    }
+
+    private static boolean containsType(Collection<? extends TypeMirror> collection, TypeMirror type) {
+        for (TypeMirror otherTypeMirror : collection) {
+            if (typeEquals(otherTypeMirror, type)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static boolean isTopLevelClass(TypeMirror importType) {
+        TypeElement type = fromTypeMirror(importType);
+        if (type != null && type.getEnclosingElement() != null) {
+            return !type.getEnclosingElement().getKind().isClass();
+        }
+        return true;
+    }
+
+    public static boolean isObject(TypeMirror actualType) {
+        return actualType.getKind() == TypeKind.DECLARED && getQualifiedName(actualType).equals("java.lang.Object");
+    }
+
+    public static TypeMirror fillInGenericWildcards(TypeMirror type) {
+        if (type.getKind() != TypeKind.DECLARED) {
+            return type;
+        }
+        DeclaredType declaredType = (DeclaredType) type;
+        TypeElement element = (TypeElement) declaredType.asElement();
+        if (element == null) {
+            return type;
+        }
+        int typeParameters = element.getTypeParameters().size();
+        if (typeParameters > 0 && declaredType.getTypeArguments().size() != typeParameters) {
+            return ProcessorContext.getInstance().getEnvironment().getTypeUtils().erasure(type);
+        }
+        return type;
+    }
+
+    public static TypeMirror eraseGenericTypes(TypeMirror type) {
+        if (type.getKind() != TypeKind.DECLARED) {
+            return type;
+        }
+        DeclaredType declaredType = (DeclaredType) type;
+        if (declaredType.getTypeArguments().size() == 0) {
+            return type;
+        }
+        return new DeclaredCodeTypeMirror((TypeElement) declaredType.asElement());
+    }
+
+    public static boolean variableEquals(VariableElement var1, VariableElement var2) {
+        if (!var1.getSimpleName().equals(var2.getSimpleName())) {
+            return false;
+        }
+        if (!ElementUtils.typeEquals(var1.asType(), var2.asType())) {
+            return false;
+        }
+        if (!ElementUtils.elementEquals(var1.getEnclosingElement(), var2.getEnclosingElement())) {
+            return false;
+        }
+        return true;
+    }
+
+    public static boolean executableEquals(ExecutableElement var1, ExecutableElement var2) {
+        if (!var1.getSimpleName().equals(var2.getSimpleName())) {
+            return false;
+        }
+        if (var1.getParameters().size() != var2.getParameters().size()) {
+            return false;
+        }
+        if (!ElementUtils.typeEquals(var1.asType(), var2.asType())) {
+            return false;
+        }
+        if (!ElementUtils.elementEquals(var1.getEnclosingElement(), var2.getEnclosingElement())) {
+            return false;
+        }
+        for (int i = 0; i < var1.getParameters().size(); i++) {
+            if (!typeEquals(var1.getParameters().get(i).asType(), var2.getParameters().get(i).asType())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static boolean elementEquals(Element element1, Element element2) {
+        if (element1.getKind() != element2.getKind()) {
+            return false;
+        } else if (element1 instanceof VariableElement) {
+            return variableEquals((VariableElement) element1, (VariableElement) element2);
+        } else if (element1 instanceof ExecutableElement) {
+            return executableEquals((ExecutableElement) element1, (ExecutableElement) element2);
+        } else if (element1 instanceof TypeElement) {
+            return typeEquals(element1.asType(), element2.asType());
+        } else if (element1 instanceof PackageElement) {
+            return element1.getSimpleName().equals(element2.getSimpleName());
+        } else {
+            throw new AssertionError("unsupported element type");
+        }
+    }
+
+    public static List<TypeMirror> sortTypes(List<TypeMirror> list, final boolean reverse) {
+        Collections.sort(list, new Comparator<TypeMirror>() {
+            public int compare(TypeMirror o1, TypeMirror o2) {
+                if (reverse) {
+                    return compareType(o2, o1);
+                } else {
+                    return compareType(o1, o2);
+                }
+            }
+        });
+        return list;
+    }
+
+    public static int compareType(TypeMirror signature1, TypeMirror signature2) {
+        if (signature1 == null) {
+            return 1;
+        } else if (signature2 == null) {
+            return -1;
+        }
+
+        if (ElementUtils.typeEquals(signature1, signature2)) {
+            return 0;
+        }
+
+        if (signature1.getKind() == TypeKind.DECLARED && signature2.getKind() == TypeKind.DECLARED) {
+            TypeElement element1 = ElementUtils.fromTypeMirror(signature1);
+            TypeElement element2 = ElementUtils.fromTypeMirror(signature2);
+
+            if (ElementUtils.getDirectSuperTypes(element1).contains(element2)) {
+                return -1;
+            } else if (ElementUtils.getDirectSuperTypes(element2).contains(element1)) {
+                return 1;
+            }
+        }
+        return ElementUtils.getSimpleName(signature1).compareTo(ElementUtils.getSimpleName(signature2));
+    }
+
+    public static List<TypeMirror> uniqueSortedTypes(Collection<TypeMirror> types, boolean reverse) {
+        if (types.isEmpty()) {
+            return new ArrayList<>(0);
+        } else if (types.size() <= 1) {
+            if (types instanceof List) {
+                return (List<TypeMirror>) types;
+            } else {
+                return new ArrayList<>(types);
+            }
+        }
+        Map<String, TypeMirror> sourceTypes = new HashMap<>();
+        for (TypeMirror type : types) {
+            sourceTypes.put(ElementUtils.getTypeId(type), type);
+        }
+        return sortTypes(new ArrayList<>(sourceTypes.values()), reverse);
+    }
+
+    public static int compareMethod(ExecutableElement method1, ExecutableElement method2) {
+        List<? extends VariableElement> parameters1 = method1.getParameters();
+        List<? extends VariableElement> parameters2 = method2.getParameters();
+        if (parameters1.size() != parameters2.size()) {
+            return Integer.compare(parameters1.size(), parameters2.size());
+        }
+
+        int result = 0;
+        for (int i = 0; i < parameters1.size(); i++) {
+            VariableElement var1 = parameters1.get(i);
+            VariableElement var2 = parameters2.get(i);
+            result = compareType(var1.asType(), var2.asType());
+            if (result != 0) {
+                return result;
+            }
+        }
+
+        result = method1.getSimpleName().toString().compareTo(method2.getSimpleName().toString());
+        if (result == 0) {
+            // if still no difference sort by enclosing type name
+            TypeElement enclosingType1 = ElementUtils.findNearestEnclosingType(method1);
+            TypeElement enclosingType2 = ElementUtils.findNearestEnclosingType(method2);
+            result = enclosingType1.getQualifiedName().toString().compareTo(enclosingType2.getQualifiedName().toString());
+        }
+        return result;
+    }
+
+}