org.jetbrains.kotlin.cfg.ControlFlowInfo.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.cfg
import org.jetbrains.kotlin.util.javaslang.ImmutableHashMap
import org.jetbrains.kotlin.util.javaslang.ImmutableMap
interface ReadOnlyControlFlowInfo {
fun getOrNull(key: K): D?
// Only used in tests
fun asMap(): ImmutableMap
}
abstract class ControlFlowInfo, K : Any, D : Any>
internal constructor(
protected val map: ImmutableMap = ImmutableHashMap.empty()
) : ImmutableMap by map, ReadOnlyControlFlowInfo {
protected abstract fun copy(newMap: ImmutableMap): S
override fun put(key: K, value: D): S = put(key, value, this[key].getOrElse(null as D?))
/**
* This overload exists just for sake of optimizations: in some cases we've just retrieved the old value,
* so we don't need to scan through the persistent hashmap again
*/
fun put(key: K, value: D, oldValue: D?): S {
@Suppress("UNCHECKED_CAST")
// Avoid a copy instance creation if new value is the same
if (value == oldValue) return this as S
return copy(map.put(key, value))
}
override fun getOrNull(key: K): D? = this[key].getOrElse(null as D?)
override fun asMap() = this
fun retainAll(predicate: (K) -> Boolean): S = copy(map.removeAll(map.keySet().filterNot(predicate)))
override fun equals(other: Any?) = map == (other as? ControlFlowInfo<*, *, *>)?.map
override fun hashCode() = map.hashCode()
override fun toString() = map.toString()
}