org.jetbrains.kotlin.resolve.scopes.SubstitutingScope.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 org.jetbrains.kotlin.resolve.scopes

import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.incremental.components.LookupLocation
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.types.TypeSubstitutor
import org.jetbrains.kotlin.utils.Printer
import org.jetbrains.kotlin.utils.newHashSetWithExpectedSize
import java.util.*

public class SubstitutingScope(private val workerScope: MemberScope, private val substitutor: TypeSubstitutor) : MemberScope {

    private var substitutedDescriptors: MutableMap? = null

    private val _allDescriptors by lazy { substitute(workerScope.getContributedDescriptors()) }

    private fun  substitute(descriptor: D?): D? {
        if (descriptor == null) return null
        if (substitutor.isEmpty()) return descriptor

        if (substitutedDescriptors == null) {
            substitutedDescriptors = HashMap()
        }

        val substituted = substitutedDescriptors!!.getOrPut(descriptor, { descriptor.substitute(substitutor) })

        @Suppress("UNCHECKED_CAST")
        return substituted as D?
    }

    private fun  substitute(descriptors: Collection): Collection {
        if (substitutor.isEmpty()) return descriptors
        if (descriptors.isEmpty()) return descriptors

        val result = newHashSetWithExpectedSize(descriptors.size())
        for (descriptor in descriptors) {
            val substitute = substitute(descriptor)
            if (substitute != null) {
                result.add(substitute)
            }
        }

        return result
    }

    override fun getContributedVariables(name: Name, location: LookupLocation) = substitute(workerScope.getContributedVariables(name, location))

    override fun getContributedClassifier(name: Name, location: LookupLocation) = substitute(workerScope.getContributedClassifier(name, location))

    override fun getContributedFunctions(name: Name, location: LookupLocation) = substitute(workerScope.getContributedFunctions(name, location))

    override fun getPackage(name: Name) = workerScope.getPackage(name)

    override fun getContributedDescriptors(kindFilter: DescriptorKindFilter,
                                           nameFilter: (Name) -> Boolean) = _allDescriptors

    override fun printScopeStructure(p: Printer) {
        p.println(javaClass.getSimpleName(), " {")
        p.pushIndent()

        p.println("substitutor = ")
        p.pushIndent()
        p.println(substitutor)
        p.popIndent()

        p.print("workerScope = ")
        workerScope.printScopeStructure(p.withholdIndentOnce())

        p.popIndent()
        p.println("}")
    }
}