JavaTypeSpec.kt

/*
 * Copyright 2022 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.codegen.java

import androidx.room.compiler.codegen.JTypeSpecBuilder
import androidx.room.compiler.codegen.VisibilityModifier
import androidx.room.compiler.codegen.XAnnotationSpec
import androidx.room.compiler.codegen.XClassName
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XFunSpec
import androidx.room.compiler.codegen.XTypeName
import androidx.room.compiler.codegen.XTypeSpec
import androidx.room.compiler.processing.XNullability
import com.squareup.javapoet.FieldSpec
import com.squareup.kotlinpoet.javapoet.JTypeSpec
import javax.lang.model.element.Modifier

internal class JavaTypeSpec(
    override val className: XClassName,
    internal val actual: JTypeSpec
) : JavaLang(), XTypeSpec {

    internal class Builder(
        private val className: XClassName,
        internal val actual: JTypeSpecBuilder
    ) : JavaLang(), XTypeSpec.Builder {
        override fun superclass(typeName: XTypeName) = apply {
            actual.superclass(typeName.java)
        }

        override fun addAnnotation(annotation: XAnnotationSpec) {
            require(annotation is JavaAnnotationSpec)
            actual.addAnnotation(annotation.actual)
        }

        override fun addProperty(
            typeName: XTypeName,
            name: String,
            visibility: VisibilityModifier,
            isMutable: Boolean,
            initExpr: XCodeBlock?,
            annotations: List<XAnnotationSpec>
        ) = apply {
            actual.addField(
                FieldSpec.builder(typeName.java, name).apply {
                    val visibilityModifier = visibility.toJavaVisibilityModifier()
                    // TODO(b/247242374) Add nullability annotations for non-private fields
                    if (visibilityModifier != Modifier.PRIVATE) {
                        if (typeName.nullability == XNullability.NULLABLE) {
                            addAnnotation(NULLABLE_ANNOTATION)
                        } else if (typeName.nullability == XNullability.NONNULL) {
                            addAnnotation(NONNULL_ANNOTATION)
                        }
                    }
                    addModifiers(visibilityModifier)
                    if (!isMutable) {
                        addModifiers(Modifier.FINAL)
                    }
                    initExpr?.let {
                        require(it is JavaCodeBlock)
                        initializer(it.actual)
                    }
                    // TODO(b/247247439): Add other annotations
                }.build()
            )
        }

        override fun addFunction(functionSpec: XFunSpec) = apply {
            require(functionSpec is JavaFunSpec)
            actual.addMethod(functionSpec.actual)
        }

        override fun build(): XTypeSpec {
            return JavaTypeSpec(className, actual.build())
        }
    }
}