1/* 2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23package org.graalvm.compiler.replacements.verifier; 24 25import java.lang.annotation.Annotation; 26import java.lang.reflect.Array; 27import java.util.ArrayList; 28import java.util.List; 29 30import javax.annotation.processing.ProcessingEnvironment; 31import javax.lang.model.element.AnnotationMirror; 32import javax.lang.model.element.AnnotationValue; 33import javax.lang.model.element.Element; 34import javax.lang.model.element.ExecutableElement; 35import javax.lang.model.type.TypeMirror; 36import javax.lang.model.util.ElementFilter; 37 38public abstract class AbstractVerifier { 39 40 protected final ProcessingEnvironment env; 41 42 public AbstractVerifier(ProcessingEnvironment env) { 43 this.env = env; 44 } 45 46 public abstract void verify(Element element, AnnotationMirror annotation, PluginGenerator generator); 47 48 public abstract Class<? extends Annotation> getAnnotationClass(); 49 50 @SuppressWarnings("unchecked") 51 protected static <T> T resolveAnnotationValue(Class<T> expectedType, AnnotationValue value) { 52 if (value == null) { 53 return null; 54 } 55 if (expectedType.isArray()) { 56 ArrayList<Object> result = new ArrayList<>(); 57 List<AnnotationValue> l = (List<AnnotationValue>) value.getValue(); 58 for (AnnotationValue el : l) { 59 result.add(resolveAnnotationValue(expectedType.getComponentType(), el)); 60 } 61 return (T) result.toArray((Object[]) Array.newInstance(expectedType.getComponentType(), result.size())); 62 } 63 Object unboxedValue = value.getValue(); 64 if (unboxedValue != null) { 65 if (expectedType == TypeMirror.class && unboxedValue instanceof String) { 66 /* 67 * Happens if type is invalid when using the ECJ compiler. The ECJ does not match 68 * AP-API specification here. 69 */ 70 return null; 71 } 72 if (!expectedType.isAssignableFrom(unboxedValue.getClass())) { 73 throw new ClassCastException(unboxedValue.getClass().getName() + " not assignable from " + expectedType.getName()); 74 } 75 } 76 return (T) unboxedValue; 77 } 78 79 protected static AnnotationValue findAnnotationValue(AnnotationMirror mirror, String name) { 80 ExecutableElement valueMethod = null; 81 for (ExecutableElement method : ElementFilter.methodsIn(mirror.getAnnotationType().asElement().getEnclosedElements())) { 82 if (method.getSimpleName().toString().equals(name)) { 83 valueMethod = method; 84 break; 85 } 86 } 87 88 if (valueMethod == null) { 89 return null; 90 } 91 92 AnnotationValue value = mirror.getElementValues().get(valueMethod); 93 if (value == null) { 94 value = valueMethod.getDefaultValue(); 95 } 96 97 return value; 98 } 99 100} 101