com.squareup.inject.inflation.processor.internal.generatedAnnotation.kt Maven / Gradle / Ivy

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/*
 * Copyright (C) 2017 Square, Inc.
 *
 * 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 com.squareup.inject.inflation.processor.internal

import com.squareup.javapoet.AnnotationSpec
import javax.annotation.processing.Processor
import javax.lang.model.SourceVersion
import javax.lang.model.SourceVersion.RELEASE_8
import javax.lang.model.util.Elements

/**
 * Create a `@Generated` annotation using the correct type based on source version and availability
 * on the compilation classpath, a `value` with the fully-qualified class name of the calling
 * [Processor], and a comment pointing to this project's GitHub repo. Returns `null` if no
 * annotation type is available on the classpath.
 */
fun Processor.createGeneratedAnnotation(
  sourceVersion: SourceVersion,
  elements: Elements
): AnnotationSpec? {
  val annotationTypeName = when {
    sourceVersion <= RELEASE_8 -> "javax.annotation.Generated"
    else -> "javax.annotation.processing.Generated"
  }
  val generatedType = elements.getTypeElement(annotationTypeName) ?: return null
  return AnnotationSpec.builder(generatedType.toClassName())
      .addMember("value", "\$S", javaClass.name)
      .addMember("comments", "\$S", "https://github.com/square/InflationInject")
      .build()
}