JarCastingKotlin-Cursor
An annotation processor that generates extension functions to convert Kotlin data classes to ContentValues and from Cursor.
Usage
Annotate your data class with @KCursorData
@KCursorData
data class Cat(val name: String)
then once the class is processed a file will be generated with the following extension functions:
fun Cat.toContentValues(): ContentValues { /* ... */ }
fun Cursor.toCat(): Cat { /* ... */ }
Custom types
The following types are supported by default:
StringByteArrayDoubleFloatIntLongShortBoolean
Kotlin-Cursor also supports types that are also annotated with @KCursorData. For exmaple:
@KCursorData
data class Bed(val owner: Cat)
For other types, you need to use the @ColumnAdapter annotation and specify a class that implements ColumnTypeAdapter. For example:
Person.kt
data class Person(
val name: String,
@ColumnAdapter(CatListAdapter::class)
val cats: List<Cat>
)
CatListColumnTypeAdapter.kt:
class CatListAdapter : ColumnTypeAdapter<List<Cat>> {
override fun fromCursor(cursor: Cursor, columnName: String): List<Cat> {
val listOfCats = cursor.getString(cursor.getColumnIndexOrThrow("cat_list"))
return listOfCats.split(',').map { Cat(it) }
}
override fun toContentValues(values: ContentValues, columnName: String, value: List<Cat>) {
values.put("cat_list", value.map { it.name }.joinToString(separator = ","))
}
}
Setup
Add a Gradle dependency:
compile 'com.github.danysantiago:kotlincursor-api:0.1.1'
kapt 'com.github.danysantiago:kotlincursor-compiler:0.1.1'
Snapshots of the development version are available in Sonatype's snapshots repository.
Thanks
To Gabriel Ittner's auto-value-cursor for which this project is based on.