Kotlin Builder Generator

A plugin for IntelliJ IDEA that auto-generates builder classes for your domain data classes, and saves you a lot of typing.

General info

This plugin for IntelliJ IDEA provides a quick way to implement a (simplified) Builder pattern for a given Kotlin data class. It will automatically generate a boilerplate builder class with a build() method that creates a valid instance of the target data class, and withX() methods that allow to manually set all primary constructor properties of the constructed object.

Features:

• Automatic boilerplate builder class generation
• Pre-set default values for any primitive, nullable and collection properties
• Generated withoutX() methods for nullable properties
• Customizable builder class and method names via plugin configuration
• Selectable placement of builder class in production or test sources
• Automatic wrapping/unwrapping of "wrapped primitive"-type properties
• Detection and usage of existing builders for property types

Work in progress:

• Generated methods to add items to collection properties

Setup

Download the latest kotlin-builder-generator-plugin-<VERSION>.zip from the releases page.

Install in your IntelliJ instance via File -> Settings -> Plugins -> [...] -> Install Plugin from Disk.

Configure to your liking via File -> Settings -> Tools -> Kotlin Builder Generator.

Usage: position cursor on the name of a Kotlin data class, open the Generate menu and select Builder Class.

Technologies

• Kotlin (written in Kotlin, for Kotlin)
• IntelliJ Platform SDK (base SDK for any IntelliJ plugin)
• KotlinPoet (Kotlin code generation)
• Gradle (build tool)
• JUnit 4 (tests)