se.ansman.kotshi.renderer.EnumAdapterRenderer.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of compiler Show documentation

An annotations processor that generates Moshi adapters from Kotlin data classes

The newest version!

package se.ansman.kotshi.renderer

import com.squareup.kotlinpoet.FunSpec
import com.squareup.kotlinpoet.ParameterSpec
import com.squareup.kotlinpoet.TypeSpec
import se.ansman.kotshi.Types
import se.ansman.kotshi.Types.Moshi.jsonDataException
import se.ansman.kotshi.addControlFlow
import se.ansman.kotshi.addNextControlFlow
import se.ansman.kotshi.addWhen
import se.ansman.kotshi.model.EnumJsonAdapter

class EnumAdapterRenderer(private val adapter: EnumJsonAdapter) : AdapterRenderer(adapter) {
    private val optionsProperty = jsonOptionsProperty(adapter.entries.map { it.serializedName })
        
    override fun TypeSpec.Builder.renderSetup() {
        addProperty(optionsProperty)
    }

    override fun FunSpec.Builder.renderToJson(
        writerParameter: ParameterSpec,
        valueParameter: ParameterSpec
    ) {
        addWhen("%N", valueParameter) {
            for (entry in adapter.entries) {
                addStatement("%T.%N·-> %N.value(%S)", adapter.targetType, entry.name, writerParameter, entry.serializedName)
            }
            addStatement("null·-> %N.nullValue()", writerParameter)
        }
    }

    override fun FunSpec.Builder.renderFromJson(readerParameter: ParameterSpec) {
        this
            .addControlFlow("return·if (%N.peek() == %T.NULL)", readerParameter, Types.Moshi.jsonReaderToken, close = false) {
                addStatement("%N.nextNull()", readerParameter)
            }
            .addNextControlFlow("else when (%N.selectString(%N))",
                readerParameter,
                optionsProperty
            ) {
                adapter.entries.forEachIndexed { index, entry ->
                    addStatement("$index·-> %T.%N", adapter.targetType, entry.name)
                }
                if (adapter.fallback == null) {
                    addStatement(
                        "else·-> throw·%T(%P)",
                        jsonDataException,
                        "Expected one of ${adapter.entries.map { it.serializedName }} but was \${${readerParameter.name}.nextString()} at path \${${readerParameter.name}.path}"
                    )
                } else {
                    addControlFlow("else·->") {
                        addStatement("%N.skipValue()", readerParameter)
                        addStatement("%T.%N", adapter.targetType, adapter.fallback.name)
                    }
                }
            }
    }
}