Mercurial > hg > graal-compiler
annotate graal/com.oracle.jvmci.runtime.processor/src/com/oracle/jvmci/runtime/processor/ServiceProviderProcessor.java @ 21552:9579a3c62a9e
use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 17:21:29 +0200 |
parents | d3002f7bd223 |
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Annotation processor for generating META-INF/services files.
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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.jvmci.runtime.processor; |
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24 |
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25 import java.io.*; |
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26 import java.util.*; |
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27 |
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28 import javax.annotation.processing.*; |
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29 import javax.lang.model.*; |
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30 import javax.lang.model.element.*; |
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31 import javax.lang.model.type.*; |
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32 import javax.tools.Diagnostic.Kind; |
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33 import javax.tools.*; |
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34 |
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35 import com.oracle.jvmci.runtime.*; |
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36 |
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37 @SupportedAnnotationTypes("com.oracle.jvmci.runtime.ServiceProvider") |
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38 public class ServiceProviderProcessor extends AbstractProcessor { |
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39 |
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40 private final Set<TypeElement> processed = new HashSet<>(); |
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41 |
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43 public SourceVersion getSupportedSourceVersion() { | |
44 return SourceVersion.latest(); | |
45 } | |
46 | |
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47 private boolean verifyAnnotation(TypeMirror serviceInterface, TypeElement serviceProvider) { |
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48 if (!processingEnv.getTypeUtils().isSubtype(serviceProvider.asType(), serviceInterface)) { |
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49 String msg = String.format("Service provider class %s doesn't implement service interface %s", serviceProvider.getSimpleName(), serviceInterface); |
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50 processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); |
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51 return false; |
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52 } |
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53 |
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54 return true; |
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55 } |
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56 |
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57 private void processElement(TypeElement serviceProvider) { |
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58 if (processed.contains(serviceProvider)) { |
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59 return; |
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60 } |
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61 |
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62 processed.add(serviceProvider); |
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63 ServiceProvider annotation = serviceProvider.getAnnotation(ServiceProvider.class); |
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64 if (annotation != null) { |
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65 try { |
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66 annotation.value(); |
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67 } catch (MirroredTypeException ex) { |
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68 TypeMirror serviceInterface = ex.getTypeMirror(); |
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69 if (verifyAnnotation(serviceInterface, serviceProvider)) { |
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70 String interfaceName = ex.getTypeMirror().toString(); |
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71 createProviderFile(serviceProvider, interfaceName); |
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72 } |
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73 } |
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74 } |
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75 } |
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76 |
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77 private void createProviderFile(TypeElement serviceProvider, String interfaceName) { |
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78 if (serviceProvider.getNestingKind().isNested()) { |
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79 // This is a simplifying constraint that means we don't have to |
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80 // processed the qualified name to insert '$' characters at |
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81 // the relevant positions. |
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82 String msg = String.format("Service provider class %s must be a top level class", serviceProvider.getSimpleName()); |
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83 processingEnv.getMessager().printMessage(Kind.ERROR, msg, serviceProvider); |
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84 return; |
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85 } |
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86 |
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87 String filename = "META-INF/providers/" + serviceProvider.getQualifiedName(); |
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88 try { |
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89 FileObject file = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", filename, serviceProvider); |
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90 PrintWriter writer = new PrintWriter(new OutputStreamWriter(file.openOutputStream(), "UTF-8")); |
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91 writer.println(interfaceName); |
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92 writer.close(); |
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93 } catch (IOException e) { |
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94 processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage(), serviceProvider); |
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95 } |
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96 } |
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97 |
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98 @Override |
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99 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { |
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100 if (roundEnv.processingOver()) { |
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101 return true; |
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102 } |
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103 |
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104 for (Element element : roundEnv.getElementsAnnotatedWith(ServiceProvider.class)) { |
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105 assert element.getKind().isClass(); |
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106 processElement((TypeElement) element); |
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107 } |
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108 |
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109 return true; |
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110 } |
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111 } |