kotlin.reflect.jvm.internal.impl.serialization.deserialization.ClassDeserializer.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2015 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 kotlin.reflect.jvm.internal.impl.serialization.deserialization

import kotlin.reflect.jvm.internal.impl.descriptors.ClassDescriptor
import kotlin.reflect.jvm.internal.impl.name.ClassId
import kotlin.reflect.jvm.internal.impl.serialization.ClassData
import kotlin.reflect.jvm.internal.impl.serialization.deserialization.descriptors.DeserializedClassDescriptor

public class ClassDeserializer(private val components: DeserializationComponents) {
    private val classes: (ClassKey) -> ClassDescriptor? =
            components.storageManager.createMemoizedFunctionWithNullableValues { key -> createClass(key) }

    // Additional ClassData parameter is needed to avoid calling ClassDataFinder#findClassData() if it is already computed at call site
    public fun deserializeClass(classId: ClassId, classData: ClassData? = null): ClassDescriptor? =
            classes(ClassKey(classId, classData))

    private fun createClass(key: ClassKey): ClassDescriptor? {
        val classId = key.classId
        components.fictitiousClassDescriptorFactory.createClass(classId)?.let { return it }

        val classData = key.classData ?: components.classDataFinder.findClassData(classId) ?: return null
        val outerContext = if (classId.isNestedClass()) {
            (deserializeClass(classId.getOuterClassId()) as? DeserializedClassDescriptor)?.c ?: return null
        }
        else {
            val fragments = components.packageFragmentProvider.getPackageFragments(classId.getPackageFqName())
            assert(fragments.size() == 1) { "There should be exactly one package: $fragments, class id is $classId" }
            components.createContext(fragments.single(), classData.getNameResolver())
        }

        return DeserializedClassDescriptor(outerContext, classData.getClassProto(), classData.getNameResolver())
    }

    private data class ClassKey(val classId: ClassId, classData: ClassData?) {
        // This property is not declared in the constructor because it shouldn't participate in equals/hashCode
        val classData: ClassData? = classData
    }
}