--- /dev/null 2015-10-08 07:26:09.000000000 -1000 +++ new/src/jdk.vm.ci/share/classes/jdk.vm.ci.service.processor/src/jdk/vm/ci/service/processor/ServiceProviderProcessor.java 2015-10-08 07:26:09.000000000 -1000 @@ -0,0 +1,112 @@ +/* + * Copyright (c) 2013, 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 jdk.vm.ci.service.processor; + +import java.io.*; +import java.util.*; + +import javax.annotation.processing.*; +import javax.lang.model.*; +import javax.lang.model.element.*; +import javax.lang.model.type.*; +import javax.tools.Diagnostic.Kind; + +import jdk.vm.ci.service.*; + +import javax.tools.*; + +@SupportedAnnotationTypes("jdk.vm.ci.service.ServiceProvider") +public class ServiceProviderProcessor extends AbstractProcessor { + + private final Set processed = new HashSet<>(); + + @Override + public SourceVersion getSupportedSourceVersion() { + return SourceVersion.latest(); + } + + private boolean verifyAnnotation(TypeMirror serviceInterface, TypeElement serviceProvider) { + if (!processingEnv.getTypeUtils().isSubtype(serviceProvider.asType(), serviceInterface)) { + String msg = String.format("Service provider class %s must implement service interface %s", serviceProvider.getSimpleName(), serviceInterface); + processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); + return false; + } + + return true; + } + + private void processElement(TypeElement serviceProvider) { + if (processed.contains(serviceProvider)) { + return; + } + + processed.add(serviceProvider); + ServiceProvider annotation = serviceProvider.getAnnotation(ServiceProvider.class); + if (annotation != null) { + try { + annotation.value(); + } catch (MirroredTypeException ex) { + TypeMirror serviceInterface = ex.getTypeMirror(); + if (verifyAnnotation(serviceInterface, serviceProvider)) { + String interfaceName = ex.getTypeMirror().toString(); + createProviderFile(serviceProvider, interfaceName); + } + } + } + } + + private void createProviderFile(TypeElement serviceProvider, String interfaceName) { + if (serviceProvider.getNestingKind().isNested()) { + // This is a simplifying constraint that means we don't have to + // processed the qualified name to insert '$' characters at + // the relevant positions. + String msg = String.format("Service provider class %s must be a top level class", serviceProvider.getSimpleName()); + processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); + return; + } + + String filename = "META-INF/jvmci.providers/" + serviceProvider.getQualifiedName(); + try { + FileObject file = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", filename, serviceProvider); + PrintWriter writer = new PrintWriter(new OutputStreamWriter(file.openOutputStream(), "UTF-8")); + writer.println(interfaceName); + writer.close(); + } catch (IOException e) { + processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage(), serviceProvider); + } + } + + @Override + public boolean process(Set annotations, RoundEnvironment roundEnv) { + if (roundEnv.processingOver()) { + return true; + } + + for (Element element : roundEnv.getElementsAnnotatedWith(ServiceProvider.class)) { + assert element.getKind().isClass(); + processElement((TypeElement) element); + } + + return true; + } +}