1 /* 2 * Copyright (c) 2013, 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 */ 23 package jdk.vm.ci.service.processor; 24 25 import java.io.*; 26 import java.util.*; 27 28 import javax.annotation.processing.*; 29 import javax.lang.model.*; 30 import javax.lang.model.element.*; 31 import javax.lang.model.type.*; 32 import javax.tools.Diagnostic.Kind; 33 34 import jdk.vm.ci.service.*; 35 36 import javax.tools.*; 37 38 @SupportedAnnotationTypes("jdk.vm.ci.service.ServiceProvider") 39 public class ServiceProviderProcessor extends AbstractProcessor { 40 41 private final Set<TypeElement> processed = new HashSet<>(); 42 43 @Override 44 public SourceVersion getSupportedSourceVersion() { 45 return SourceVersion.latest(); 46 } 47 48 private boolean verifyAnnotation(TypeMirror serviceInterface, TypeElement serviceProvider) { 49 if (!processingEnv.getTypeUtils().isSubtype(serviceProvider.asType(), serviceInterface)) { 50 String msg = String.format("Service provider class %s must implement service interface %s", serviceProvider.getSimpleName(), serviceInterface); 51 processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); 52 return false; 53 } 54 55 return true; 56 } 57 58 private void processElement(TypeElement serviceProvider) { 59 if (processed.contains(serviceProvider)) { 60 return; 61 } 62 63 processed.add(serviceProvider); 64 ServiceProvider annotation = serviceProvider.getAnnotation(ServiceProvider.class); 65 if (annotation != null) { 66 try { 67 annotation.value(); 68 } catch (MirroredTypeException ex) { 69 TypeMirror serviceInterface = ex.getTypeMirror(); 70 if (verifyAnnotation(serviceInterface, serviceProvider)) { 71 String interfaceName = ex.getTypeMirror().toString(); 72 createProviderFile(serviceProvider, interfaceName); 73 } 74 } 75 } 76 } 77 78 private void createProviderFile(TypeElement serviceProvider, String interfaceName) { 79 if (serviceProvider.getNestingKind().isNested()) { 80 // This is a simplifying constraint that means we don't have to 81 // processed the qualified name to insert '$' characters at 82 // the relevant positions. 83 String msg = String.format("Service provider class %s must be a top level class", serviceProvider.getSimpleName()); 84 processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); 85 return; 86 } 87 88 String filename = "META-INF/jvmci.providers/" + serviceProvider.getQualifiedName(); 89 try { 90 FileObject file = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", filename, serviceProvider); 91 PrintWriter writer = new PrintWriter(new OutputStreamWriter(file.openOutputStream(), "UTF-8")); 92 writer.println(interfaceName); 93 writer.close(); 94 } catch (IOException e) { 95 processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage(), serviceProvider); 96 } 97 } 98 99 @Override 100 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { 101 if (roundEnv.processingOver()) { 102 return true; 103 } 104 105 for (Element element : roundEnv.getElementsAnnotatedWith(ServiceProvider.class)) { 106 assert element.getKind().isClass(); 107 processElement((TypeElement) element); 108 } 109 110 return true; 111 } 112 }