roomie

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Utility library that utilizes KSP to generate Room type converter classes.

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## Roomie
Roomie is an annotation processing library that utilizes KSP to generate TypeConverter classes for Room. TypeConverter classes most often involve same boiler-plate code and Roomie makes it really easy to quickly create them with a single annotation.

## Usage
### Annotate the specific model class using ```@AddConverter```
```
@AddConverter
data class Person(val firstName: String, val lastName: String)
```

It's as simple as that! 
Rebuild the project to generate the converter. A converter class with the name ```PersonConverter``` will be generated for the ```Person``` data class     above.
In your case, use [Model name]Converter to get the corresponding converter for your data class.

### Specifying converter name
By default, the generated converter has **Converter** appended to its name but it can be changed by using the ```name``` argument specified in             ```@AddConverter``` annotation.
```
@AddConverter(name = "PeopleConverter")
data class Person(val firstName: String, val lastName: String)
```
This will generate the converter using ```PeopleConverter``` as its name.

### Working with lists
By default, the generated converter class will be similar to the code below:
```
open class PersonConverter {
  @TypeConverter
  fun fromString(value: String): Person {
    val type = object : TypeToken<Person>() {}.type
    return Gson().fromJson<Person>(value, type)
  }

@TypeConverter
  fun fromList(value: Person): String {
    val gson = Gson()
    return gson.toJson(value)
  }
}
```
In certain cases you may want to wrap the model class with a kotlin list. This can be achieved by using the ```asList``` argument which takes a boolean specified in ```@AddConverter``` annotation, which by default is ```false```.

```
@AddConverter(asList = true)
data class Person(val firstName: String, val lastName: String)
```
The resulting generated converter class is shown below:
```
open class PersonListConverter {
  @TypeConverter
  fun fromString(value: String): List<Person> {
    val type = object : TypeToken<List<Person>>() {}.type
    return Gson().fromJson<List<Person>>(value, type)
  }

@TypeConverter
  fun fromList(value: List<Person>): String {
    val gson = Gson()
    return gson.toJson(value)
  }
}
```
* In this case the resulting converter class now has ```ListConverter``` appended to its name. To get the corresponding converter class when ```asList``` is set to ```true``` append ```ListConverter``` to its name, as in [Model name]ListConverter.

## Download
[![JitPack](https://img.shields.io/jitpack/v/github/ezechuka/roomie?color=%2346C018&style=for-the-badge)](https://jitpack.io/#ezechuka/roomie/)

### 1. Add the JitPack repository to your project
**groovy - settings.gradle (project level)**
```
repositories {
    google()
    mavenCentral()
    jcenter() // Warning: this repository is going to shut down soon
    maven { url 'https://jitpack.io' }
  }
```
**kotlin - setting.gradle.kts**
```
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url = uri("https://www.jitpack.io" ) }
    }
}
```

### 2. Add the KSP plugin:
    
> The version you chose for the KSP plugin depends on the Kotlin version your project uses. <br>
You can check https://github.com/google/ksp/releases for the list of KSP versions, then pick the last release that matches your Kotlin version.  
Example: If you're using 1.5.30 Kotlin version, then the corresponding KSP version is 1.5.30-1.0.0.

**groovy - build.gradle (module level)**
```gradle
plugins {
    //...
    id 'com.google.devtools.ksp' version '1.5.30-1.0.0' // Depends on your kotlin version
}
```

**kotlin - build.gradle.kts (module level)**
```gradle
plugins {
    //...
    id("com.google.devtools.ksp") version "1.5.30-1.0.0" // Depends on your kotlin version
}
```
    
### 3. Add depedencies:

**groovy - build.gradle (module level)**
```gradle
implementation 'com.github.ezechuka.roomie:roomie-annotation:1.0.0-beta02'
ksp 'com.github.ezechuka.roomie:roomie-processor:1.0.0-beta02'
```

**kotlin - build.gradle.kts (module level)**
```gradle
implementation("com.github.ezechuka.roomie:roomie-annotation:1.0.0-beta02")
ksp("com.github.ezechuka.roomie:roomie-processor:1.0.0-beta02")
```

**Also [Room](https://developer.android.com/jetpack/androidx/releases/room#declaring_dependencies) and [Gson](https://github.com/google/gson) needs to be included in the build.gradle (module level) for Groovy or build.gradle.kts (module level) for Kotlin**

### 4. Specify build generated folder to IDE
Within the ```android``` block add:

**groovy - build.gradle (module level)**
```gradle
applicationVariants.all { variant ->
    kotlin.sourceSets {
        getByName(variant.name) {
            kotlin.srcDir("build/generated/ksp/${variant.name}/kotlin")
        }
    }
}
```

**kotlin - build.gradle.kts (module level)**
```gradle
applicationVariants.all {
    kotlin.sourceSets {
        getByName(name) {
            kotlin.srcDir("build/generated/ksp/$name/kotlin")
        }
    }
}
```

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