JavacFiler.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.javac
import androidx.room.compiler.processing.XElement
import androidx.room.compiler.processing.XFiler
import androidx.room.compiler.processing.XProcessingEnv
import com.squareup.javapoet.JavaFile
import com.squareup.kotlinpoet.FileSpec
import java.io.OutputStream
import java.nio.file.Path
import javax.annotation.processing.Filer
import javax.tools.StandardLocation
import kotlin.io.path.extension
internal class JavacFiler(
private val processingEnv: XProcessingEnv,
val delegate: Filer
) : XFiler {
// "mode" is ignored in javac, and only applicable in KSP
override fun write(javaFile: JavaFile, mode: XFiler.Mode) {
javaFile.writeTo(delegate)
}
override fun write(fileSpec: FileSpec, mode: XFiler.Mode) {
require(processingEnv.options.containsKey("kapt.kotlin.generated")) {
val filePath = fileSpec.packageName.replace('.', '/')
"Could not generate kotlin file $filePath/${fileSpec.name}.kt. The " +
"annotation processing environment is not set to generate Kotlin files."
}
fileSpec.writeTo(delegate)
}
override fun writeSource(
packageName: String,
fileNameWithoutExtension: String,
extension: String,
originatingElements: List<XElement>,
mode: XFiler.Mode
): OutputStream {
require(extension == "java" || extension == "kt") {
"Source file extension must be either 'java' or 'kt', but was: $extension"
}
val javaOriginatingElements =
originatingElements.filterIsInstance<JavacElement>().map { it.element }.toTypedArray()
return when (extension) {
"java" -> {
val name = if (packageName.isEmpty()) {
fileNameWithoutExtension
} else {
"$packageName.$fileNameWithoutExtension"
}
delegate.createSourceFile(
name,
*javaOriginatingElements
).openOutputStream()
}
"kt" -> {
delegate.createResource(
StandardLocation.SOURCE_OUTPUT,
packageName,
"$fileNameWithoutExtension.$extension",
*javaOriginatingElements
).openOutputStream()
}
else -> error("file type not supported: $extension")
}
}
override fun writeResource(
filePath: Path,
originatingElements: List<XElement>,
mode: XFiler.Mode
): OutputStream {
require(filePath.extension != "java" && filePath.extension != "kt") {
"Could not create resource file with a source type extension. File must not be " +
"neither '.java' nor '.kt', but was: $filePath"
}
val javaOriginatingElements =
originatingElements.filterIsInstance<JavacElement>().map { it.element }.toTypedArray()
val fileObject = delegate.createResource(
StandardLocation.CLASS_OUTPUT,
"",
filePath.toString(),
*javaOriginatingElements
)
return fileObject.openOutputStream()
}
}