├── .gitignore
├── .idea
├── compiler.xml
├── kotlinc.xml
├── misc.xml
├── modules.xml
├── modules
│ ├── generator
│ │ ├── generator.iml
│ │ ├── generator_main.iml
│ │ └── generator_test.iml
│ ├── kotlin-code-gen-sample_main.iml
│ ├── kotlin-code-gen-sample_test.iml
│ └── sample-main
│ │ ├── sample-main.iml
│ │ ├── sample-main_main.iml
│ │ └── sample-main_test.iml
└── vcs.xml
├── README.md
├── build.gradle
├── generator
├── build.gradle
└── src
│ └── main
│ └── kotlin
│ └── work
│ └── beltran
│ └── sample
│ ├── GenName.kt
│ ├── Generator.kt
│ ├── Kson.kt
│ └── KsonProcessor.kt
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── kotlin-code-gen-sample.iml
├── sample-main
├── build.gradle
└── src
│ └── main
│ └── kotlin
│ └── work
│ └── beltran
│ └── sample
│ └── Main.kt
└── settings.gradle
/.gitignore:
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1 | # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
2 | # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
3 |
4 | # User-specific stuff:
5 | .idea/**/workspace.xml
6 | .idea/**/tasks.xml
7 | .idea/dictionaries
8 |
9 | # Sensitive or high-churn files:
10 | .idea/**/dataSources/
11 | .idea/**/dataSources.ids
12 | .idea/**/dataSources.xml
13 | .idea/**/dataSources.local.xml
14 | .idea/**/sqlDataSources.xml
15 | .idea/**/dynamic.xml
16 | .idea/**/uiDesigner.xml
17 |
18 | # Gradle:
19 | .idea/**/gradle.xml
20 | .idea/**/libraries
21 |
22 | # CMake
23 | cmake-build-debug/
24 |
25 | # Mongo Explorer plugin:
26 | .idea/**/mongoSettings.xml
27 |
28 | ## File-based project format:
29 | *.iws
30 |
31 | ## Plugin-specific files:
32 |
33 | # IntelliJ
34 | out/
35 |
36 |
37 | .gradle
38 | build/
39 |
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/README.md:
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1 | # kotlin-code-gen-sample
2 |
3 | Code for the article: https://proandroiddev.com/hello-world-of-annotation-processing-in-kotlin-3ec0290c1fdd
4 |
5 | ---
6 |
7 | Miguel Beltran - [beltran.work](https://beltran.work)
8 |
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/build.gradle:
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1 | apply plugin: 'kotlin'
2 |
3 | group 'beltran.work'
4 | version '1.0-SNAPSHOT'
5 |
6 | buildscript {
7 | ext.kotlin_version = '1.2.30'
8 |
9 | repositories {
10 | mavenCentral()
11 | }
12 | dependencies {
13 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
14 | }
15 | }
16 |
17 |
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/generator/build.gradle:
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1 | apply plugin: 'kotlin'
2 | apply plugin: 'kotlin-kapt'
3 |
4 | repositories {
5 | mavenCentral()
6 | }
7 |
8 | dependencies {
9 | compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
10 | compile 'com.squareup:kotlinpoet:0.7.0'
11 | compile "com.google.auto.service:auto-service:1.0-rc2"
12 | kapt "com.google.auto.service:auto-service:1.0-rc2"
13 | }
14 |
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/generator/src/main/kotlin/work/beltran/sample/GenName.kt:
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1 | package work.beltran.sample
2 |
3 | annotation class GenName
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/generator/src/main/kotlin/work/beltran/sample/Generator.kt:
--------------------------------------------------------------------------------
1 | package work.beltran.sample
2 |
3 | import com.google.auto.service.AutoService
4 | import com.squareup.kotlinpoet.FileSpec
5 | import com.squareup.kotlinpoet.FunSpec
6 | import com.squareup.kotlinpoet.TypeSpec
7 | import java.io.File
8 | import javax.annotation.processing.*
9 | import javax.lang.model.SourceVersion
10 | import javax.lang.model.element.TypeElement
11 |
12 | @AutoService(Processor::class)
13 | class Generator: AbstractProcessor() {
14 |
15 | override fun init(p0: ProcessingEnvironment) {
16 | super.init(p0)
17 | }
18 |
19 | override fun getSupportedAnnotationTypes(): MutableSet {
20 | println("getSupportedAnnotationTypes")
21 | return mutableSetOf(GenName::class.java.name)
22 | }
23 |
24 | override fun getSupportedSourceVersion(): SourceVersion {
25 | return SourceVersion.latest()
26 | }
27 |
28 | override fun process(set: MutableSet, roundEnv: RoundEnvironment): Boolean {
29 | println("process")
30 | roundEnv.getElementsAnnotatedWith(GenName::class.java)
31 | .forEach {
32 | val className = it.simpleName.toString()
33 | println("Processing: $className")
34 | val pack = processingEnv.elementUtils.getPackageOf(it).toString()
35 | generateClass(className, pack)
36 | }
37 | return true
38 | }
39 |
40 | private fun generateClass(className: String, pack: String) {
41 | val fileName = "Generated_$className"
42 | val file = FileSpec.builder(pack, fileName)
43 | .addType(TypeSpec.classBuilder(fileName)
44 | .addFunction(FunSpec.builder("getName")
45 | .addStatement("return \"World\"")
46 | .build())
47 | .build())
48 | .build()
49 |
50 | val kaptKotlinGeneratedDir = processingEnv.options[KAPT_KOTLIN_GENERATED_OPTION_NAME]
51 | file.writeTo(File(kaptKotlinGeneratedDir, "$fileName.kt"))
52 | }
53 |
54 | companion object {
55 | const val KAPT_KOTLIN_GENERATED_OPTION_NAME = "kapt.kotlin.generated"
56 | }
57 | }
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/generator/src/main/kotlin/work/beltran/sample/Kson.kt:
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1 | package work.beltran.sample
2 |
3 | annotation class Kson
4 |
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/generator/src/main/kotlin/work/beltran/sample/KsonProcessor.kt:
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1 | package work.beltran.sample
2 |
3 | import com.google.auto.service.AutoService
4 | import com.squareup.kotlinpoet.FileSpec
5 | import com.squareup.kotlinpoet.FunSpec
6 | import com.squareup.kotlinpoet.asTypeName
7 | import java.io.File
8 | import javax.annotation.processing.AbstractProcessor
9 | import javax.annotation.processing.ProcessingEnvironment
10 | import javax.annotation.processing.Processor
11 | import javax.annotation.processing.RoundEnvironment
12 | import javax.lang.model.SourceVersion
13 | import javax.lang.model.element.Element
14 | import javax.lang.model.element.ElementKind
15 | import javax.lang.model.element.TypeElement
16 |
17 | @AutoService(Processor::class)
18 | class KsonProcessor : AbstractProcessor() {
19 |
20 | override fun init(p0: ProcessingEnvironment) {
21 | super.init(p0)
22 | }
23 |
24 | override fun getSupportedAnnotationTypes(): MutableSet {
25 | println("getSupportedAnnotationTypes")
26 | return mutableSetOf(Kson::class.java.name)
27 | }
28 |
29 | override fun getSupportedSourceVersion(): SourceVersion {
30 | return SourceVersion.latest()
31 | }
32 |
33 | override fun process(set: MutableSet, roundEnv: RoundEnvironment): Boolean {
34 | println("process")
35 | roundEnv.getElementsAnnotatedWith(Kson::class.java)
36 | .forEach {
37 | println("Processing: ${it.simpleName}")
38 | val pack = processingEnv.elementUtils.getPackageOf(it).toString()
39 | generateClass(it, pack)
40 | }
41 | return true
42 | }
43 |
44 | private fun generateClass(klass: Element, pack: String) {
45 | val fileName = "${klass.simpleName}KsonUtil"
46 | val string = StringBuilder("return \"{ ")
47 | klass.enclosedElements.forEach {
48 | println("$it ${it.kind}")
49 | when(it.kind) {
50 | ElementKind.FIELD -> {
51 | string.append("\\\"")
52 | string.append(it)
53 | string.append("\\\": ")
54 | string.append("\\\"")
55 | string.append("\$")
56 | string.append(it)
57 | string.append("\\\"")
58 | string.append(' ')
59 | }
60 | else -> { }
61 | }
62 | }
63 | string.append("}\"")
64 | val file = FileSpec.builder(pack, fileName)
65 | .addFunction(FunSpec.builder("toJson")
66 | .returns(String::class)
67 | .receiver(klass.asType().asTypeName())
68 | .addStatement(string.toString())
69 | .build())
70 | .build()
71 |
72 | val kaptKotlinGeneratedDir = processingEnv.options[KAPT_KOTLIN_GENERATED_OPTION_NAME]
73 | file.writeTo(File(kaptKotlinGeneratedDir, "$fileName.kt"))
74 | }
75 |
76 | companion object {
77 | const val KAPT_KOTLIN_GENERATED_OPTION_NAME = "kapt.kotlin.generated"
78 | }
79 | }
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/gradle/wrapper/gradle-wrapper.jar:
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https://raw.githubusercontent.com/miquelbeltran/kotlin-code-gen-sample/9af88610954bb68003aeac06ababbbd96172aa5a/gradle/wrapper/gradle-wrapper.jar
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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Tue Apr 17 10:37:17 PDT 2018
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-rc-2-bin.zip
7 |
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/gradlew:
--------------------------------------------------------------------------------
1 | #!/usr/bin/env sh
2 |
3 | ##############################################################################
4 | ##
5 | ## Gradle start up script for UN*X
6 | ##
7 | ##############################################################################
8 |
9 | # Attempt to set APP_HOME
10 | # Resolve links: $0 may be a link
11 | PRG="$0"
12 | # Need this for relative symlinks.
13 | while [ -h "$PRG" ] ; do
14 | ls=`ls -ld "$PRG"`
15 | link=`expr "$ls" : '.*-> \(.*\)$'`
16 | if expr "$link" : '/.*' > /dev/null; then
17 | PRG="$link"
18 | else
19 | PRG=`dirname "$PRG"`"/$link"
20 | fi
21 | done
22 | SAVED="`pwd`"
23 | cd "`dirname \"$PRG\"`/" >/dev/null
24 | APP_HOME="`pwd -P`"
25 | cd "$SAVED" >/dev/null
26 |
27 | APP_NAME="Gradle"
28 | APP_BASE_NAME=`basename "$0"`
29 |
30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
31 | DEFAULT_JVM_OPTS=""
32 |
33 | # Use the maximum available, or set MAX_FD != -1 to use that value.
34 | MAX_FD="maximum"
35 |
36 | warn ( ) {
37 | echo "$*"
38 | }
39 |
40 | die ( ) {
41 | echo
42 | echo "$*"
43 | echo
44 | exit 1
45 | }
46 |
47 | # OS specific support (must be 'true' or 'false').
48 | cygwin=false
49 | msys=false
50 | darwin=false
51 | nonstop=false
52 | case "`uname`" in
53 | CYGWIN* )
54 | cygwin=true
55 | ;;
56 | Darwin* )
57 | darwin=true
58 | ;;
59 | MINGW* )
60 | msys=true
61 | ;;
62 | NONSTOP* )
63 | nonstop=true
64 | ;;
65 | esac
66 |
67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
68 |
69 | # Determine the Java command to use to start the JVM.
70 | if [ -n "$JAVA_HOME" ] ; then
71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
72 | # IBM's JDK on AIX uses strange locations for the executables
73 | JAVACMD="$JAVA_HOME/jre/sh/java"
74 | else
75 | JAVACMD="$JAVA_HOME/bin/java"
76 | fi
77 | if [ ! -x "$JAVACMD" ] ; then
78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
79 |
80 | Please set the JAVA_HOME variable in your environment to match the
81 | location of your Java installation."
82 | fi
83 | else
84 | JAVACMD="java"
85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
86 |
87 | Please set the JAVA_HOME variable in your environment to match the
88 | location of your Java installation."
89 | fi
90 |
91 | # Increase the maximum file descriptors if we can.
92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
93 | MAX_FD_LIMIT=`ulimit -H -n`
94 | if [ $? -eq 0 ] ; then
95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
96 | MAX_FD="$MAX_FD_LIMIT"
97 | fi
98 | ulimit -n $MAX_FD
99 | if [ $? -ne 0 ] ; then
100 | warn "Could not set maximum file descriptor limit: $MAX_FD"
101 | fi
102 | else
103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
104 | fi
105 | fi
106 |
107 | # For Darwin, add options to specify how the application appears in the dock
108 | if $darwin; then
109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
110 | fi
111 |
112 | # For Cygwin, switch paths to Windows format before running java
113 | if $cygwin ; then
114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
116 | JAVACMD=`cygpath --unix "$JAVACMD"`
117 |
118 | # We build the pattern for arguments to be converted via cygpath
119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
120 | SEP=""
121 | for dir in $ROOTDIRSRAW ; do
122 | ROOTDIRS="$ROOTDIRS$SEP$dir"
123 | SEP="|"
124 | done
125 | OURCYGPATTERN="(^($ROOTDIRS))"
126 | # Add a user-defined pattern to the cygpath arguments
127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
129 | fi
130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
131 | i=0
132 | for arg in "$@" ; do
133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
135 |
136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
138 | else
139 | eval `echo args$i`="\"$arg\""
140 | fi
141 | i=$((i+1))
142 | done
143 | case $i in
144 | (0) set -- ;;
145 | (1) set -- "$args0" ;;
146 | (2) set -- "$args0" "$args1" ;;
147 | (3) set -- "$args0" "$args1" "$args2" ;;
148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
154 | esac
155 | fi
156 |
157 | # Escape application args
158 | save ( ) {
159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
160 | echo " "
161 | }
162 | APP_ARGS=$(save "$@")
163 |
164 | # Collect all arguments for the java command, following the shell quoting and substitution rules
165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
166 |
167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
169 | cd "$(dirname "$0")"
170 | fi
171 |
172 | exec "$JAVACMD" "$@"
173 |
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/gradlew.bat:
--------------------------------------------------------------------------------
1 | @if "%DEBUG%" == "" @echo off
2 | @rem ##########################################################################
3 | @rem
4 | @rem Gradle startup script for Windows
5 | @rem
6 | @rem ##########################################################################
7 |
8 | @rem Set local scope for the variables with windows NT shell
9 | if "%OS%"=="Windows_NT" setlocal
10 |
11 | set DIRNAME=%~dp0
12 | if "%DIRNAME%" == "" set DIRNAME=.
13 | set APP_BASE_NAME=%~n0
14 | set APP_HOME=%DIRNAME%
15 |
16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
17 | set DEFAULT_JVM_OPTS=
18 |
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 |
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 |
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 |
32 | goto fail
33 |
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 |
38 | if exist "%JAVA_EXE%" goto init
39 |
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 |
46 | goto fail
47 |
48 | :init
49 | @rem Get command-line arguments, handling Windows variants
50 |
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 |
53 | :win9xME_args
54 | @rem Slurp the command line arguments.
55 | set CMD_LINE_ARGS=
56 | set _SKIP=2
57 |
58 | :win9xME_args_slurp
59 | if "x%~1" == "x" goto execute
60 |
61 | set CMD_LINE_ARGS=%*
62 |
63 | :execute
64 | @rem Setup the command line
65 |
66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
67 |
68 | @rem Execute Gradle
69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
70 |
71 | :end
72 | @rem End local scope for the variables with windows NT shell
73 | if "%ERRORLEVEL%"=="0" goto mainEnd
74 |
75 | :fail
76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
77 | rem the _cmd.exe /c_ return code!
78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
79 | exit /b 1
80 |
81 | :mainEnd
82 | if "%OS%"=="Windows_NT" endlocal
83 |
84 | :omega
85 |
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/kotlin-code-gen-sample.iml:
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
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/sample-main/build.gradle:
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1 | apply plugin: 'kotlin'
2 | apply plugin: 'kotlin-kapt'
3 |
4 | kapt {
5 | generateStubs = true
6 | }
7 |
8 | repositories {
9 | mavenCentral()
10 | }
11 |
12 | sourceSets {
13 | main {
14 | java {
15 | srcDir "${buildDir.absolutePath}/tmp/kapt/main/kotlinGenerated/"
16 | }
17 | }
18 | }
19 |
20 | dependencies {
21 | kapt project(":generator")
22 | compileOnly project(":generator")
23 | compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
24 | }
25 |
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/sample-main/src/main/kotlin/work/beltran/sample/Main.kt:
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1 | package work.beltran.sample
2 |
3 | @GenName
4 | class Hello
5 |
6 | @Kson
7 | data class User(val name: String,
8 | val email: String)
9 |
10 | fun main(args: Array) {
11 | println("Hello ${Generated_Hello().getName()}")
12 | println("User to JSON")
13 | val user = User(
14 | name = "Test",
15 | email = "test@email.com"
16 | )
17 | println("User: $user")
18 | println("Json: ${user.toJson()}")
19 | }
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/settings.gradle:
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1 | rootProject.name = 'kotlin-code-gen-sample'
2 | include 'generator'
3 | include 'sample-main'
4 |
5 |
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