/*
 * Copyright (C) 2023 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 android.tools.common

object Cache {
    private var cache = mutableMapOf<Any, Any>()

    data class Backup(val cache: MutableMap<Any, Any>)

    fun <T : Any> get(element: T): T {
        return cache.getOrPut(element) { element } as T
    }

    fun clear() {
        cache = mutableMapOf()
    }

    fun backup(): Backup {
        return Backup(cache.toMutableMap())
    }

    fun restore(backup: Backup) {
        cache = backup.cache
    }
}