org.jetbrains.kotlin.cli.common.arguments.Freezable.kt Maven / Gradle / Ivy
/*
* 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.cli.common.arguments
import java.io.Serializable
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty
abstract class Freezable {
protected open inner class FreezableVar(private var value: T) : ReadWriteProperty, Serializable {
override fun getValue(thisRef: Any, property: KProperty<*>) = value
override fun setValue(thisRef: Any, property: KProperty<*>, value: T) {
if (frozen) throw IllegalStateException("Instance of ${this::class} is frozen")
this.value = value
}
}
protected inner class NullableStringFreezableVar(value: String?) : FreezableVar(value) {
private val defaultValue = value
override fun setValue(thisRef: Any, property: KProperty<*>, value: String?) {
super.setValue(thisRef, property, if (value.isNullOrEmpty()) defaultValue else value)
}
}
private var frozen: Boolean = false
private fun getInstanceWithFreezeStatus(value: Boolean) = if (value == frozen) this else copyBean(this).apply { frozen = value }
fun frozen() = getInstanceWithFreezeStatus(true)
fun unfrozen() = getInstanceWithFreezeStatus(false)
}