org.jetbrains.kotlin.javac.wrappers.trees.utils.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2017 JetBrains s.r.o.
 *
 * 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 org.jetbrains.kotlin.javac.wrappers.trees

import com.sun.tools.javac.tree.JCTree
import org.jetbrains.kotlin.descriptors.Visibility
import org.jetbrains.kotlin.javac.wrappers.symbols.SymbolBasedArrayAnnotationArgument
import org.jetbrains.kotlin.javac.wrappers.symbols.SymbolBasedReferenceAnnotationArgument
import org.jetbrains.kotlin.javac.wrappers.symbols.getVisibility
import org.jetbrains.kotlin.load.java.structure.JavaAnnotation
import org.jetbrains.kotlin.name.ClassId
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.name.Name
import javax.lang.model.element.Modifier

internal val JCTree.JCModifiers.isAbstract: Boolean
    get() = Modifier.ABSTRACT in getFlags()

internal val JCTree.JCModifiers.isFinal: Boolean
    get() = Modifier.FINAL in getFlags()

internal val JCTree.JCModifiers.isStatic: Boolean
    get() = Modifier.STATIC in getFlags()

internal val JCTree.JCModifiers.hasDefaultModifier: Boolean
    get() = Modifier.DEFAULT in getFlags()

internal val JCTree.JCModifiers.visibility: Visibility
    get() = getFlags().getVisibility()

internal fun JCTree.annotations(): Collection = when (this) {
    is JCTree.JCMethodDecl -> mods?.annotations
    is JCTree.JCClassDecl -> mods?.annotations
    is JCTree.JCVariableDecl -> mods?.annotations
    is JCTree.JCTypeParameter -> annotations
    else -> null
} ?: emptyList()

fun Collection.filterTypeAnnotations(): Collection {
    val filteredAnnotations = arrayListOf()
    val targetClassId = ClassId(FqName("java.lang.annotation"), Name.identifier("Target"))
    for (annotation in this) {
        val annotationClass = annotation.resolve()
        val targetAnnotation = annotationClass?.annotations?.find { it.classId == targetClassId } ?: continue
        val elementTypeArg = targetAnnotation.arguments.firstOrNull() ?: continue

        when (elementTypeArg) {
            is SymbolBasedArrayAnnotationArgument -> {
                elementTypeArg.args.find {
                    (it as? SymbolBasedReferenceAnnotationArgument)?.element?.simpleName?.contentEquals("TYPE_USE") ?: false
                }?.let { filteredAnnotations.add(annotation) }
            }
            is SymbolBasedReferenceAnnotationArgument -> {
                elementTypeArg.element.simpleName.takeIf { it.contentEquals("TYPE_USE") }
                    ?.let { filteredAnnotations.add(annotation) }
            }
            is TreeBasedArrayAnnotationArgument -> {
                elementTypeArg.args.find {
                    (it as? TreeBasedReferenceAnnotationArgument)?.entryName?.asString() == "TYPE_USE"
                }?.let { filteredAnnotations.add(annotation) }
            }
            is TreeBasedReferenceAnnotationArgument -> {
                if (elementTypeArg.entryName?.asString() == "TYPE_USE") {
                    filteredAnnotations.add(annotation)
                }
            }
        }
    }

    return filteredAnnotations
}