{"id":1167,"date":"2019-04-04T23:59:51","date_gmt":"2019-04-04T14:59:51","guid":{"rendered":"https:\/\/www.charlezz.com\/?p=1167"},"modified":"2019-12-21T17:12:01","modified_gmt":"2019-12-21T08:12:01","slug":"android-annotation-processor-%eb%a7%8c%eb%93%a4%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/charlezz.com\/?p=1167","title":{"rendered":"[Android] Annotation Processor \ub9cc\ub4e4\uae30"},"content":{"rendered":"

\"\"<\/a><\/h1>\n

Annotation\uc774\ub780 ?<\/h1>\n

\uc560\ub178\ud14c\uc774\uc158\uc774\ub780 \ubb34\uc5c7\uc77c\uae4c\uc694?<\/span><\/p>\n

\uc0ac\uc2e4 \uc6b0\ub9ac \ubaa8\ub450\uac00 \uc774\ubbf8 \uc815\uc758\ub41c \uc560\ub178\ud14c\uc774\uc158\uc744 \uc4f0\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uba74, @Override \uc5b4\ub178\ud14c\uc774\uc158\uc744 \uc0ac\uc6a9\ud558\uc5ec \uba54\uc18c\ub4dc\ub97c \uc7ac\uc815\uc758\ud558\uace0 \uc2f1\uae00\ud1a4 \ud328\ud134\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud574 @Singleton\uc744 \uc0ac\uc6a9\ud558\uace0 @NonNull, @StringRes, @IntRes \ub4f1\uacfc \uac19\uc740 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uac01\uac00\uc758 \uc560\ub178\ud14c\uc774\uc158\uc5d0 \ub300\ud574\uc11c \uc124\uba85\ud558\uace0\uc790 \ud558\ub294\uac74 \uc544\ub2d9\ub2c8\ub2e4. \uc0c8\ub85c\uc6b4 \uc560\ub178\ud14c\uc774\uc158\uc744 \ub9cc\ub4e4\uace0, \ub610 \ub3d9\uc791\ud558\ub294 \uc6d0\ub9ac\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\uace0\uc790 \ud569\ub2c8\ub2e4.<\/span><\/p>\n

\uc560\ub178\ud14c\uc774\uc158\uc740 \uc790\ubc14 \uc18c\uc2a4 \ucf54\ub4dc\uc5d0 \ucd94\uac00 \ud560 \uc218\uc788\ub294 \uba54\ud0c0 \ub370\uc774\ud130\uc758 \ud55c \ud615\ud0dc\uc785\ub2c8\ub2e4. \ud074\ub798\uc2a4, \uc778\ud130\ud398\uc774\uc2a4, \uba54\uc18c\ub4dc, \ubcc0\uc218, \ub9e4\uac1c \ubcc0\uc218 \ub4f1\uc5d0 \ucd94\uac00 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc560\ub178\ud14c\uc774\uc158\uc740 \uc18c\uc2a4 \ud30c\uc77c\uc5d0\uc11c \uc77d\uc744 \uc218\ub3c4 \uc788\uace0, \ucef4\ud30c\uc77c\ub7ec\uc5d0 \uc758\ud574 \uc0dd\uc131\ub41c \ud074\ub798\uc2a4 \ud30c\uc77c\uc5d0 \ub0b4\uc7a5\ub418\uc5b4 \uc77d\ud790 \uc218\ub3c4 \uc788\uc73c\uba70, Runtime\uc5d0 Java VM\uc5d0 \uc758\ud574 \uc720\uc9c0\ub418\uc5b4 \ub9ac\ud50c\ub809\uc158\uc5d0 \uc758\ud574 \uc77d\uc5b4 \ub0bc \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

Annotation Processor\ub780?<\/h2>\n

\uc77c\ubc18\uc801\uc73c\ub85c \uc560\ub178\ud14c\uc774\uc158\uc5d0 \ub300\ud55c \ucf54\ub4dc\ubca0\uc774\uc2a4\ub97c \uac80\uc0ac, \uc218\uc815 \ub610\ub294 \uc0dd\uc131\ud558\ub294\ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ubcf8\uc9c8\uc801\uc73c\ub85c \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c\ub294 java \ucef4\ud30c\uc77c\ub7ec\uc758 \ud50c\ub7ec\uadf8\uc778\uc758 \uc77c\uc885\uc785\ub2c8\ub2e4. \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c\ub97c \uc801\uc7ac\uc801\uc18c\uc5d0 \uc798 \uc0ac\uc6a9\ud55c\ub2e4\uba74 \uac1c\ubc1c\uc790\uc758 \ucf54\ub4dc\ub97c \ub2e8\uc21c\ud654 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

Why Annotation?<\/h2>\n

\uc65c \uc560\ub178\ud14c\uc774\uc158\uc744 \uc368\uc57c\ud560\uae4c\uc694?<\/p>\n

\uccab\ubc88\uc9f8 \uc774\uc720, \ube60\ub985\ub2c8\ub2e4.<\/h5>\n

Annotation Processor\ub294 \uc2e4\uc81c\ub85c javac \ucef4\ud30c\uc77c\ub7ec\uc758 \uc77c\ubd80\uc774\ubbc0\ub85c \ubaa8\ub4e0 \ucc98\ub9ac\uac00 \ub7f0\ud0c0\uc784\ubcf4\ub2e4\ub294 \ucef4\ud30c\uc77c\uc2dc\uac04\uc5d0 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. Annotation Processor\uac00 \uc815\ub9d0 \ube60\ub978 \uc774\uc720\uc785\ub2c8\ub2e4.\u00a0<\/span><\/p>\n

\ub450\ubc88\uc9f8 \uc774\uc720, \ub9ac\ud50c\ub809\uc158\uc744 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/h5>\n

\uc790\ubc14\uc758 \ub9ac\ud50c\ub809\uc158<\/a>\uc740 \ub7f0\ud0c0\uc784\uc5d0 \ub9ce\uc740 \uc608\uc678\ub97c \ubc1c\uc0dd\uc2dc\ud0b5\ub2c8\ub2e4. \uc5b4\ub290 \ub204\uad6c\ub3c4 \uc608\uc678\ucc98\ub9ac\ub97c \ub9ce\uc774 \ud558\ub294\uac83\uc744 \uc6d0\uce58\ub294 \uc54a\uc2b5\ub2c8\ub2e4. \ub610\ud55c \ub9ac\ud50c\ub809\uc158\uc744 \ube44\uc6a9\uc774 \ud070 \uc791\uc5c5\uc774\uba70, Annotation Processor\ub294 \ub9ac\ud50c\ub809\uc158\uc774 \uc5c6\uc774 \ud504\ub85c\uadf8\ub7a8\uc758 \uc758\ubbf8 \uad6c\uc870\ub97c \uc54c\uc218 \uc788\uac8c \ud574\uc90d\ub2c8\ub2e4.<\/p>\n

\uc138\ubc88\uc9f8 \uc774\uc720, Boilerplate code\ub97c \uc0dd\uc131\ud574\uc90d\ub2c8\ub2e4.<\/h5>\n

Annotation Processor\ub97c \uc0ac\uc6a9\ud558\ub294 \uac00\uc7a5 \ud070 \uc774\uc720\uc774\uc790 \uc720\uc6a9\ud55c \uae30\ub2a5\uc740 \ubc14\ub85c \ubcf4\uc77c\ub7ec\ud50c\ub808\uc774\ud2b8 \ucf54\ub4dc \uc0dd\uc131\uc785\ub2c8\ub2e4. ButterKnife, Room, Retrofit\ub4f1 \ub9ce\uc740 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub4e4\uc774 \ubc18\ubcf5\ub418\ub294 \uc9c0\ub8e8\ud55c \ucf54\ub4dc\ub85c\ubd80\ud130 \ubc97\uc5b4\ub098\uace0\uc790 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

Annotation Processor\ub294 \uc5b4\ub5bb\uac8c \ub3d9\uc791\ud558\ub098\uc694?<\/h2>\n

\uc560\ub178\ud14c\uc774\uc158 \ucc98\ub9ac\ub294 \uc5ec\ub7ec \ub77c\uc6b4\ub4dc\uc5d0 \uac78\uccd0 \uc218\ud589\ub429\ub2c8\ub2e4.<\/p>\n

    \n
  1. \uc790\ubc14 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucef4\ud30c\uc77c\uc744 \uc218\ud589\ud569\ub2c8\ub2e4. (\uc790\ubc14 \ucef4\ud30c\uc77c\ub7ec\ub294 \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c\uc5d0 \ub300\ud574 \ubbf8\ub9ac \uc54c\uace0 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4.)<\/li>\n
  2. \uc2e4\ud589\ub418\uc9c0 \uc54a\uc740 \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c\ub4e4\uc744 \uc218\ud589\ud569\ub2c8\ub2e4. (\uac01\uac01\uc758 \ud504\ub85c\uc138\uc11c\ub294 \ubaa8\ub450 \uac01\uc790\uc5d0 \uc5ed\ud560\uc5d0 \ub9de\ub294 \uad6c\ud604\uc774 \ub418\uc5b4\uc788\uc5b4\uc57c\ud569\ub2c8\ub2e4.)<\/li>\n
  3. \ud504\ub85c\uc138\uc11c \ub0b4\ubd80\uc5d0\uc11c \uc560\ub178\ud14c\uc774\uc158\uc774 \ub2ec\ub9b0 Element(\ubcc0\uc218, \uba54\uc18c\ub4dc, \ud074\ub798\uc2a4 \ub4f1)\ub4e4\uc5d0 \ub300\ud55c \ucc98\ub9ac\ub97c \ud569\ub2c8\ub2e4. (\ubcf4\ud1b5 \uc774\uacf3\uc5d0\uc11c \uc790\ubc14 \ud074\ub798\uc2a4\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4.)<\/li>\n
  4. \ucef4\ud30c\uc77c\ub7ec\uac00 \ubaa8\ub4e0 \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c\uac00 \uc2e4\ud589\ub418\uc5c8\ub294\uc9c0 \ud655\uc778\ud558\uace0, \uadf8\ub807\uc9c0 \uc54a\ub2e4\uba74 \ubc18\ubcf5\ud574\uc11c \uc704 \uc791\uc5c5\uc744 \uc218\ud589\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n

    \ubc31\ubb38\uc774\ubd88\uc5ec\uc77c\uacac, \uc544\ub798\uc758 \uc774\ubbf8\uc9c0\ub97c \ud655\uc778\ud558\uc2dc\uba74 \uc774\ud574\uac00 \uc27d\uac8c \ub420 \uac83\uc785\ub2c8\ub2e4.<\/p>\n

    <\/a>\"\"<\/a>
    \n<\/a>\ub098\ub9cc\uc758 \uc560\ub178\ud14c\uc774\uc158 \ub9cc\ub4e4\uae30 (\uc778\ud150\ud2b8 \ube4c\ub354 \ub9cc\ub4e4\uae30)<\/h2>\n

    \ub2e4\uc74c\uacfc \uac19\uc740 \uc900\ube44\ub97c \ud569\ub2c8\ub2e4.<\/p>\n

      \n
    1. \uc0c8\ub85c\uc6b4 \ud504\ub85c\uc81d\ud2b8\ub97c \ub9cc\ub4ed\ub2c8\ub2e4. (\uc790\ub3d9\uc0dd\uc131\ub418\ub294 app\ubaa8\ub4c8 \ud3ec\ud568)<\/li>\n
    2. \uc0c8\ub85c\uc6b4 \uc790\ubc14 \ubaa8\ub4c8\uc744 \ub9cc\ub4ed\ub2c8\ub2e4. \uc774 \ubaa8\ub4c8\uc758 \uc774\ub984\uc740 annotaion\uc73c\ub85c \ud558\uaca0\uc2b5\ub2c8\ub2e4. \ub2e8\uc9c0 \ucee4\uc2a4\ud140 \uc560\ub178\ud14c\uc774\uc158 \uc815\uc758\ub9cc \ud558\ub294 \ubaa8\ub4c8\uc774 \ub420\uac83\uc785\ub2c8\ub2e4. (\uc774\ub54c \uc548\ub4dc\ub85c\uc774\ub4dc \uc2a4\ud29c\ub514\uc624\uc5d0 \uc758\ud574 \uc790\ub3d9\uc0dd\uc131\ub418\ub294 MyClass\uc640 \uac19\uc740 \ud30c\uc77c\uc740 \uc0ad\uc81c\ud558\uc154\ub3c4 \ubb34\uad00\ud569\ub2c8\ub2e4)<\/li>\n
    3. \uc0c8\ub85c\uc6b4 \uc560\ub178\ud14c\uc774\uc158 \ud504\ub85c\uc138\uc11c \ubaa8\ub4c8\uc744 \ub9cc\ub4ed\ub2c8\ub2e4. \uc774 \ubaa8\ub4c8\ub3c4 \uc790\ubc14 \ubaa8\ub4c8\uc785\ub2c8\ub2e4.\u00a0\uc774 \ubaa8\ub4c8\uc740 \ubaa8\ub4e0 \uacc4\uc0b0 \ubc0f \ucf54\ub4dc \uc0dd\uc131\uc744 \uc218\ud589\ud569\ub2c8\ub2e4.\u00a0<\/li>\n<\/ol>\n

      <\/a>\"\"<\/a>
      \n<\/a>\ucd1d 3\uac1c\uc758 \ubaa8\ub4c8(app, annotation, annotation_processor)\uc774 \uc900\ube44 \ub418\uc5c8\ub294\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4.<\/p>\n

      \"\"<\/p>\n

       <\/p>\n

      \ub2e4\uc74c\uacfc \uac19\uc740 \uc758\uc874\uc131\uc744 \uac00\uc9d1\ub2c8\ub2e4.
      \napp\/build.gradle<\/strong><\/p>\n

      dependencies {\r\n    ...  \r\n    implementation project(':annotation')\r\n    annotationProcessor project(':annotation_processor')\r\n}<\/pre>\n
      annotation_processor\/build.gradle<\/strong><\/p>\n
      dependencies {\r\n    implementation project(':annotation')\r\n}<\/pre>\n
      \ubaa8\ub4e0 \uc900\ube44\uac00 \ub05d\ub0ac\ub2e4\uba74, \uc774\uc81c \uc560\ub178\ud14c\uc774\uc158\uc744 \ub9cc\ub4e4\uae30 \uc704\ud574 annotation\ubaa8\ub4c8<\/strong>\uc744 \uc120\ud0dd\ud558\uc5ec CharlesIntent.java\ud30c\uc77c\uc744 \ud558\ub098 \ub9cc\ub4e4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
      \"\"<\/a>\uc544\ub798\uc640 \uac19\uc774 \ucf54\ub4dc\ub97c \uc791\uc131\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n
      @Target(ElementType.TYPE)\r\n@Retention(RetentionPolicy.SOURCE)\r\npublic @interface CharlesIntent {\r\n}\r\n<\/pre>\n
      @interface<\/h4>\n
      \ucef4\ud30c\uc77c\ub7ec\uc5d0\uac8c \uc0ac\uc6a9\uc790 \uc815\uc758 \uc560\ub178\ud14c\uc774\uc158\uc784\uc744 \uc54c\ub824\uc90d\ub2c8\ub2e4. CharlesIntent\ub77c\ub294 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc815\uc758\ud569\ub2c8\ub2e4.<\/p>\n
      @Target<\/h4>\n
      \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud558\uae30 \uc704\ud55c \ud0c0\uac9f\uc744 \uc815\uc758\ud569\ub2c8\ub2e4.(\ud074\ub798\uc2a4, \uba54\uc18c\ub4dc, \ubcc0\uc218 \ub4f1)<\/p>\n
      public enum ElementType {\r\n    TYPE, \/\/class, interface, enum \ub4f1\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    FIELD, \/\/\uba64\ubc84\ubcc0\uc218\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    METHOD, \/\/\uba54\uc18c\ub4dc\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    PARAMETER, \/\/\ub9e4\uac1c\ubcc0\uc218\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    CONSTRUCTOR, \/\/\uc0dd\uc131\uc790\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    LOCAL_VARIABLE, \/\/\uc9c0\uc5ed \ubcc0\uc218 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    ANNOTATION_TYPE, \/\/\uc560\ub178\ud14c\uc774\uc158\ud0c0\uc785\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    PACKAGE, \/\/\ud328\ud0a4\uc9c0\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    TYPE_PARAMETER, \/\/\ub9e4\uac1c\ubcc0\uc218 \ud0c0\uc785\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n    TYPE_USE; \/\/\ud0c0\uc785 \uc0ac\uc6a9\uc2dc\uc5d0 \uc560\ub178\ud14c\uc774\uc158\uc744 \uc9c0\uc815\ud560 \ub54c\r\n\r\n    private ElementType() {\r\n    }\r\n}<\/pre>\n
      @Retention<\/h4>\n
      \uc0ac\uc6a9\uc790 \uc815\uc758 \uc560\ub178\ud14c\uc774\uc158\uc774 \uc800\uc7a5\ub418\ub294 \ud0c0\uc785\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4. 3\uac00\uc9c0 \ud0c0\uc785\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n