KspPrimitiveType.kt

/*
 * Copyright 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.room.compiler.processing.ksp

import androidx.room.compiler.processing.XNullability
import androidx.room.compiler.processing.tryUnbox
import com.google.devtools.ksp.symbol.KSType
import com.squareup.javapoet.TypeName

/**
 * This tries to mimic primitive types in Kotlin.
 *
 * Primitiveness of a type cannot always be driven from itself (e.g. its nullability).
 * For instance, a kotlin.Int might be non-null but still be non primitive if it is derived from a
 * generic type argument or is part of type parameters.
 */
internal class KspPrimitiveType(
    env: KspProcessingEnv,
    ksType: KSType
) : KspType(env, ksType) {
    override val typeName: TypeName
        get() = ksType.typeName(env.resolver).tryUnbox()

    override fun boxed(): KspType {
        return env.wrap(
            ksType = ksType,
            allowPrimitives = false
        )
    }

    override fun copyWithNullability(nullability: XNullability): KspType {
        return when (nullability) {
            XNullability.NONNULL -> {
                this
            }
            XNullability.NULLABLE -> {
                // primitive types cannot be nullable hence we box them.
                boxed().makeNullable()
            }
            else -> {
                // this should actually never happens as the only time this is called is from
                // make nullable-make nonnull but we have this error here for completeness.
                error("cannot set nullability to unknown in KSP")
            }
        }
    }
}