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Masahiro Wakame
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2011/04/08 トップゲート社内で実施した勉強会の発表資料
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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
3.
Annotation 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
35.
Minecraft 2011
4 9
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