--- /dev/null 2017-01-22 10:16:57.869617664 -0800 +++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.serviceprovider.processor/src/org/graalvm/compiler/serviceprovider/processor/ServiceProviderProcessor.java 2017-02-15 17:09:31.717209868 -0800 @@ -0,0 +1,145 @@ +/* + * 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 org.graalvm.compiler.serviceprovider.processor; + +import java.io.IOException; +import java.io.OutputStreamWriter; +import java.io.PrintWriter; +import java.util.HashSet; +import java.util.Set; + +import javax.annotation.processing.AbstractProcessor; +import javax.annotation.processing.FilerException; +import javax.annotation.processing.RoundEnvironment; +import javax.annotation.processing.SupportedAnnotationTypes; +import javax.lang.model.SourceVersion; +import javax.lang.model.element.Element; +import javax.lang.model.element.TypeElement; +import javax.lang.model.type.MirroredTypeException; +import javax.lang.model.type.TypeMirror; +import javax.tools.Diagnostic.Kind; +import javax.tools.FileObject; +import javax.tools.StandardLocation; + +import org.graalvm.compiler.serviceprovider.ServiceProvider; + +/** + * Processes classes annotated with {@link ServiceProvider}. For a service defined by {@code S} and + * a class {@code P} implementing the service, this processor generates the file + * {@code META-INF/providers/P} whose contents are a single line containing the fully qualified name + * of {@code S}. + */ +@SupportedAnnotationTypes("org.graalvm.compiler.serviceprovider.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/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(isBug367599(e) ? Kind.NOTE : Kind.ERROR, e.getMessage(), serviceProvider); + } + } + + /** + * Determines if a given exception is (most likely) caused by + * Bug 367599. + */ + public static boolean isBug367599(Throwable t) { + if (t instanceof FilerException) { + for (StackTraceElement ste : t.getStackTrace()) { + if (ste.toString().contains("org.eclipse.jdt.internal.apt.pluggable.core.filer.IdeFilerImpl.create")) { + // See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=367599 + return true; + } + } + } + if (t.getCause() != null) { + return isBug367599(t.getCause()); + } + return false; + } + + @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; + } +}