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APT
               Annotation Processing Tool




                         TOPGATE            2011/04/08
2011   4   9
@vvakame


               ↓


2011   4   9
Annotation



2011   4   9
Annotation
                            @JsonModel
                            public class Message {
       • Annotation =
                            	 @JsonKey
                            	 String id;
       •
                            	 @JsonKey
                            	 String room;
       •
                            	 @JsonKey
                            	 String text;
       • @Override
                            	 @JsonKey
                            	 String timestamp;



2011   4   9
APT



2011   4   9
APT
               • Annotation Processing Tool

               •

               •

                   •


                   •

2011   4   9
Slim3        APT
               • Entity ⇔ Model

                • Map<String, Object>
                    POJO

                •

                • Reflection


2011   4   9
←                   →
       •           Reflection   •


       •                       •


       •                       •


       •                       •


       •                       •

2011   4   9
APT   Version



2011   4   9
APT       Version

               •

                   • com.sun.mirror
                   • Java5

                   • Slim3



2011   4   9
APT           Version
               • JSR 269
                • javax.lang.model
                • Java6 (JSR270)

                • JsonPullParser

                • Project Coin(JSR334)


2011   4   9
JsonPullParser
                  →




2011   4   9
Annotation
               • @interface

               • Retention (                   Annotation           )

               • Target (          Annotation                   )
                 @Retention(RetentionPolicy.SOURCE)
                 @Target({
                 	 ElementType.FIELD
                 })                                             JsonModel
                 public @interface JsonKey {
                                                                  JsonKey
                 	 public String value() default "";
                 	 public boolean in() default true;
                 	 public boolean out() default true;
                 	 public boolean decamelize() default false;
                 }

2011   4   9
AbstractProcessor
               •
                   @SupportedSourceVersion(SourceVersion.RELEASE_6)
                   @SupportedAnnotationTypes("net.vvakame.util.jsonpullparser.annotation.*")
                   public class JsonAnnotationProcessor extends AbstractProcessor {



               • EntryPoint
                   • process

                   • RoundEnviroment                             Element

                                                      JsonAnnotationProcessor

2011   4   9
RoundEnviroment
               •              Element

               •

                   •

                   •

               •                        Retention
                   SOURCE Annotation        …

2011   4   9
Element
               •
                                   Element
               •
                   •       Annotation       Element
                   •
                       •                 (ex setter, getter              )

                       •
                               ClassGenerateHelper#ValueExtractVisitor

2011   4   9
TypeMirror
               •

               •           Element→TypeMirror→
                              Element

                   •            …

               • Element            …


2011   4   9
Annotation
                  • Annotation


                                                                                 APT
   @JsonModel(treatUnknownKeyAsError = true,           	   String getElementKeyString(Element element) {
               decamelize = true)                      	   	   JsonKey key = element.getAnnotation(JsonKey.class);
   public class Hoge extends RecvGeoInfoLog {          	   	   JsonModel model = element.getEnclosingElement()
                                                                                     .getAnnotation(JsonModel.class);
   	       @JsonKey("foga")                            	   	   String keyStr;
   	       String piyo;                                	   	   if (!"".equals(key.value())) {
                                                       	   	   	    keyStr = key.value();
   	       @JsonKey(converter = DateConverter.class)   	   	   } else if ("".equals(key.value()) && key.decamelize()) {
   	       Date at;                                    	   	   	    keyStr = decamelize(element.toString());
   }                                                   	   	   } else if ("".equals(key.value()) && model.decamelize()) {
                                                       	   	   	    keyStr = decamelize(element.toString());
                                                       	   	   } else {
                                                       	   	   	    keyStr = element.toString();
                                                       	   	   }
                                                       	   	   return keyStr;
                                                       	   }


2011   4   9
Message
                  •

                  •                     Element         |
       JsonKey key = el.getAnnotation(JsonKey.class);

       String setter = getElementSetter(el);
       if (key.in() && setter == null) {
       	    Log.e("can't find setter method", el);
       	    encountError = true;
       	    return defaultAction(t, el);
       }




                                                            Log
2011   4   9
JavaFileObject
               • Java

               • ProcessingEnvironment        Filer



               •



                                  ClassGenerateHelper#write

2011   4   9
• Util
                • Elements
                  Element

                • Types
                • TypeMirror

               • Visitor
                • Annotation, Element, TypeMirror
                             ClassGenerateHelper#ValueExtractVisitor

2011   4   9
•       APT         jar

               • META-INF/services/
                  javax.annotation.processing.Processor

                   •             Processor               FQN
                              FQN = package               +

                                  /src/main/resources/

2011   4   9
2011   4   9
• Aptina
                • UnitTest

               • TemplateEngine (MVEL)
                •

               • Eclipse
               • maven
                • jar

2011   4   9
Aptina
               • Aptina

                •       Processor   JUnit

                •                      Try&Error

                • UnitTest                           …

                    •

                    •                                             …
                                    JsonAnnotationProcessorTest

2011   4   9
TemplateEngine(MVEL)
               •
                   •
                   •
               • Javadoc
               •

                   (                                       )
                           MvelTemplate, JsonModelGen.java.mvel

2011   4   9
maven
               • jar
               •


               •       Eclipse
               •
               •                           ...

                                 pom.xml

2011   4   9
Formatter...?
               • Java
               •                                      (                            )
               •
                                  UnitTest                             …
               •                      FQN                  import                  …
                   } else
                   if ("place".equals(key)) {

                   	   net.vvakame.sample.twitter.Place tmp =
                          net.vvakame.sample.twitter.PlaceGenerated.get(parser);
                   	   obj.setPlace(tmp);
                   	   if (listener != null) {
                   	   	 listener.onAdd(tmp);
                   	   }
2011   4   9
• core
                •        jar
               • apt
                • APT          jar
                • APT                UnitTest
               • usage
                • APT                    UnitTest
                •
2011   4   9
Eclipse


           •            1

               • MVEL




2011   4   9
2011   4   9
JsonPullParser

               • https://github.com/vvakame/JSONPullParser

                • APT Json→POJO                Java

                • Android              http://bit.ly/hFTbtP

                  • Tweet           →1Tweet

                • SengokuDroid server-side



2011   4   9
2011   4   9
• Android Slim3

                • HamsterDB..? → GPL...
                • SQLite..? →    KVS      ...

               • MsgpackParser

               • Java     Formatter


2011   4   9
Minecraft




2011   4   9

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僕の考えるAPT開発の常識

  • 1. APT Annotation Processing Tool TOPGATE 2011/04/08 2011 4 9
  • 2. @vvakame ↓ 2011 4 9
  • 4. Annotation @JsonModel public class Message { • Annotation = @JsonKey String id; • @JsonKey String room; • @JsonKey String text; • @Override @JsonKey String timestamp; 2011 4 9
  • 5. APT 2011 4 9
  • 6. APT • Annotation Processing Tool • • • • 2011 4 9
  • 7. Slim3 APT • Entity ⇔ Model • Map<String, Object> POJO • • Reflection 2011 4 9
  • 8. → • Reflection • • • • • • • • • 2011 4 9
  • 9. APT Version 2011 4 9
  • 10. APT Version • • com.sun.mirror • Java5 • Slim3 2011 4 9
  • 11. APT Version • JSR 269 • javax.lang.model • Java6 (JSR270) • JsonPullParser • Project Coin(JSR334) 2011 4 9
  • 12. JsonPullParser → 2011 4 9
  • 13. Annotation • @interface • Retention ( Annotation ) • Target ( Annotation ) @Retention(RetentionPolicy.SOURCE) @Target({ ElementType.FIELD }) JsonModel public @interface JsonKey { JsonKey public String value() default ""; public boolean in() default true; public boolean out() default true; public boolean decamelize() default false; } 2011 4 9
  • 14. AbstractProcessor • @SupportedSourceVersion(SourceVersion.RELEASE_6) @SupportedAnnotationTypes("net.vvakame.util.jsonpullparser.annotation.*") public class JsonAnnotationProcessor extends AbstractProcessor { • EntryPoint • process • RoundEnviroment Element JsonAnnotationProcessor 2011 4 9
  • 15. RoundEnviroment • Element • • • • Retention SOURCE Annotation … 2011 4 9
  • 16. Element • Element • • Annotation Element • • (ex setter, getter ) • ClassGenerateHelper#ValueExtractVisitor 2011 4 9
  • 17. TypeMirror • • Element→TypeMirror→ Element • … • Element … 2011 4 9
  • 18. Annotation • Annotation APT @JsonModel(treatUnknownKeyAsError = true, String getElementKeyString(Element element) { decamelize = true) JsonKey key = element.getAnnotation(JsonKey.class); public class Hoge extends RecvGeoInfoLog { JsonModel model = element.getEnclosingElement() .getAnnotation(JsonModel.class); @JsonKey("foga") String keyStr; String piyo; if (!"".equals(key.value())) { keyStr = key.value(); @JsonKey(converter = DateConverter.class) } else if ("".equals(key.value()) && key.decamelize()) { Date at; keyStr = decamelize(element.toString()); } } else if ("".equals(key.value()) && model.decamelize()) { keyStr = decamelize(element.toString()); } else { keyStr = element.toString(); } return keyStr; } 2011 4 9
  • 19. Message • • Element | JsonKey key = el.getAnnotation(JsonKey.class); String setter = getElementSetter(el); if (key.in() && setter == null) { Log.e("can't find setter method", el); encountError = true; return defaultAction(t, el); } Log 2011 4 9
  • 20. JavaFileObject • Java • ProcessingEnvironment Filer • ClassGenerateHelper#write 2011 4 9
  • 21. • Util • Elements Element • Types • TypeMirror • Visitor • Annotation, Element, TypeMirror ClassGenerateHelper#ValueExtractVisitor 2011 4 9
  • 22. APT jar • META-INF/services/ javax.annotation.processing.Processor • Processor FQN FQN = package + /src/main/resources/ 2011 4 9
  • 23. 2011 4 9
  • 24. • Aptina • UnitTest • TemplateEngine (MVEL) • • Eclipse • maven • jar 2011 4 9
  • 25. Aptina • Aptina • Processor JUnit • Try&Error • UnitTest … • • … JsonAnnotationProcessorTest 2011 4 9
  • 26. TemplateEngine(MVEL) • • • • Javadoc • ( ) MvelTemplate, JsonModelGen.java.mvel 2011 4 9
  • 27. maven • jar • • Eclipse • • ... pom.xml 2011 4 9
  • 28. Formatter...? • Java • ( ) • UnitTest … • FQN import … } else if ("place".equals(key)) { net.vvakame.sample.twitter.Place tmp = net.vvakame.sample.twitter.PlaceGenerated.get(parser); obj.setPlace(tmp); if (listener != null) { listener.onAdd(tmp); } 2011 4 9
  • 29. • core • jar • apt • APT jar • APT UnitTest • usage • APT UnitTest • 2011 4 9
  • 30. Eclipse • 1 • MVEL 2011 4 9
  • 31. 2011 4 9
  • 32. JsonPullParser • https://github.com/vvakame/JSONPullParser • APT Json→POJO Java • Android http://bit.ly/hFTbtP • Tweet →1Tweet • SengokuDroid server-side 2011 4 9
  • 33. 2011 4 9
  • 34. • Android Slim3 • HamsterDB..? → GPL... • SQLite..? → KVS ... • MsgpackParser • Java Formatter 2011 4 9