add annotation and compiler module

add example class

app/build.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
 
 android {
     compileSdkVersion 29
@@ -27,11 +28,14 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.core:core-ktx:1.2.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+
+    implementation project(':fastbuilderannotations')
+    kapt project(':fastbuildercompiler')
 }

app/src/main/java/com/bsobe/fastbuilder/model/Item.kt

@@ -0,0 +1,9 @@
+package com.bsobe.fastbuilder.model
+
+import com.bsobe.fastbuilderannotations.FastBuilder
+
+@FastBuilder
+data class Item(
+    val name: String,
+    val value: Long? = null
+)

app/src/test/java/com/bsobe/fastbuilder/ExampleUnitTest.kt

@@ -1,9 +1,9 @@
 package com.bsobe.fastbuilder
 
+import com.bsobe.fastbuilder.model.ItemBuilder
+import org.junit.Assert.assertEquals
 import org.junit.Test
 
-import org.junit.Assert.*
-
 /**
  * Example local unit test, which will execute on the development machine (host).
  *
@@ -13,5 +13,9 @@ class ExampleUnitTest {
     @Test
     fun addition_isCorrect() {
         assertEquals(4, 2 + 2)
+        val item = ItemBuilder()
+            .name("name")
+            .value(14L)
+            .build()
     }
 }

fastbuilderannotations/.gitignore

@@ -0,0 +1,71 @@
+# Built application files
+*.apk
+*.ap_
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+# Android Studio 3 in .gitignore file.
+.idea/caches
+.idea/modules.xml
+# Comment next line if keeping position of elements in Navigation Editor is relevant for you
+.idea/navEditor.xml
+.idea/codeStyles/
+
+# Keystore files
+# Uncomment the following line if you do not want to check your keystore files in.
+#*.jks
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+/.idea/

fastbuilderannotations/build.gradle

@@ -0,0 +1,9 @@
+apply plugin: 'java-library'
+apply plugin: 'kotlin'
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+}
+sourceCompatibility = "8"
+targetCompatibility = "8"

fastbuilderannotations/src/main/java/com/bsobe/fastbuilderannotations/FastBuilder.kt

@@ -0,0 +1,5 @@
+package com.bsobe.fastbuilderannotations
+
+@Retention(AnnotationRetention.SOURCE)
+@Target(AnnotationTarget.CLASS)
+annotation class FastBuilder()

fastbuildercompiler/.gitignore

@@ -0,0 +1,71 @@
+# Built application files
+*.apk
+*.ap_
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+# Android Studio 3 in .gitignore file.
+.idea/caches
+.idea/modules.xml
+# Comment next line if keeping position of elements in Navigation Editor is relevant for you
+.idea/navEditor.xml
+.idea/codeStyles/
+
+# Keystore files
+# Uncomment the following line if you do not want to check your keystore files in.
+#*.jks
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+/.idea/

fastbuildercompiler/build.gradle

@@ -0,0 +1,12 @@
+apply plugin: 'java-library'
+apply plugin: 'kotlin'
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation project(':fastbuilderannotations')
+    implementation 'com.squareup:kotlinpoet:1.5.0'
+    implementation "org.jetbrains.kotlin:kotlin-reflect:1.3.70"
+}
+sourceCompatibility = "8"
+targetCompatibility = "8"

fastbuildercompiler/src/main/java/com/bsobe/fastbuildercompiler/AnnotationFinder.kt

@@ -0,0 +1,29 @@
+package com.bsobe.fastbuildercompiler
+
+import javax.annotation.processing.Messager
+import javax.lang.model.element.Element
+import javax.lang.model.element.TypeElement
+import javax.tools.Diagnostic
+
+object AnnotationFinder {
+
+    fun searchOn(
+        logger: Messager,
+        rootElements: Set<Element>,
+        supportedAnnotations: MutableSet<out TypeElement>
+    ): Sequence<TypeElement> {
+        return rootElements.asSequence()
+            .filterIsInstance<TypeElement>()
+            .map { Pair(it.annotationMirrors.asSequence(), it) }
+            .filter {
+                supportedAnnotations.find { annotation ->
+                    it.first.find { annotationMirror ->
+                        annotationMirror.annotationType == annotation.asType()
+                    } != null
+                } != null
+            }.map {
+                it.second
+            }
+            .onEach { logger.printMessage(Diagnostic.Kind.NOTE, it.toString()) }
+    }
+}

fastbuildercompiler/src/main/java/com/bsobe/fastbuildercompiler/BuilderFactory.kt

@@ -0,0 +1,82 @@
+package com.bsobe.fastbuildercompiler
+
+import com.bsobe.fastbuildercompiler.types.Type
+import com.squareup.kotlinpoet.ClassName
+import com.squareup.kotlinpoet.FunSpec
+import com.squareup.kotlinpoet.KModifier
+import com.squareup.kotlinpoet.ParameterSpec
+import com.squareup.kotlinpoet.PropertySpec
+import com.squareup.kotlinpoet.TypeSpec
+import com.squareup.kotlinpoet.asTypeName
+import javax.lang.model.element.Element
+import kotlin.reflect.KTypeProjection
+import kotlin.reflect.KVariance
+import kotlin.reflect.full.createType
+
+object BuilderFactory {
+
+    fun addClassProperties(element: Element, classBuilder: TypeSpec.Builder): PropertySpec {
+        val propertyType = element.asType().asTypeName()
+        KTypeProjection(KVariance.INVARIANT, Int::class.createType())
+        val decidedPropertyType = Type.decideType(propertyType)
+        val decidedType = decidedPropertyType.getKotlinType(element, propertyType)
+        val property = PropertySpec
+            .builder(
+                name = element.simpleName.toString(),
+                type = decidedType,
+                modifiers = *arrayOf(KModifier.PRIVATE)
+            )
+            .initializer(decidedPropertyType.getPropertyDefaultValue(element, propertyType))
+            .mutable(mutable = true)
+            .build()
+        classBuilder.addProperty(propertySpec = property)
+        return property
+    }
+
+    fun addClassMethod(
+        element: Element,
+        classBuilder: TypeSpec.Builder,
+        generatedClassName: ClassName
+    ) {
+        val propertyType = element.asType().asTypeName()
+        val elementName = element.simpleName.toString()
+        val decidedPropertyType = Type.decideType(propertyType)
+        val decidedType = decidedPropertyType.getKotlinType(element, propertyType)
+        val parameterSpec = ParameterSpec
+            .builder(
+                name = elementName,
+                type = decidedType
+            )
+            .build()
+
+        val function = FunSpec
+            .builder(elementName)
+            .addParameter(parameterSpec)
+            .returns(generatedClassName)
+            .addStatement("return \n\tapply { this.$elementName = $elementName }")
+            .build()
+
+        classBuilder.addFunction(function)
+    }
+
+    fun addBuildMethod(
+        className: ClassName,
+        propertyNames: List<String>,
+        classBuilder: TypeSpec.Builder
+    ) {
+        val returnStatementBuilder = StringBuilder("return ${className.simpleName}(")
+        propertyNames.forEachIndexed { index, propertyName ->
+            returnStatementBuilder.append("\n\t$propertyName = $propertyName")
+            if (index != propertyNames.lastIndex) {
+                returnStatementBuilder.append(",")
+            }
+        }
+        returnStatementBuilder.append("\n)")
+        val function = FunSpec
+            .builder("build")
+            .returns(className)
+            .addStatement(returnStatementBuilder.toString())
+            .build()
+        classBuilder.addFunction(function)
+    }
+}

fastbuildercompiler/src/main/java/com/bsobe/fastbuildercompiler/FileOperations.kt

@@ -0,0 +1,9 @@
+package com.bsobe.fastbuildercompiler
+
+object FileOperations {
+
+    private const val BUILDER_CLASS_NAME_SUFFIX: String = "Builder"
+
+    fun generateBuilderClassName(originalFileName: String): String =
+        originalFileName + BUILDER_CLASS_NAME_SUFFIX
+}