jetbrains.exodus.kotlin.Kodus.kt Maven / Gradle / Ivy
/**
* Copyright 2010 - 2022 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
*
* https://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 jetbrains.exodus.kotlin
import kotlin.reflect.KProperty
val T?.notNull: T get() = this ?: throw IllegalStateException()
fun T?.notNull(msg: () -> Any?) = this ?: throw IllegalStateException(msg().toString())
inline fun T.synchronized(block: T.() -> R): R = synchronized(this) {
return block()
}
class DefaultDelegate(private val getDefault: () -> T) {
private var value: T? = null
operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
return value ?: getDefault().also { value = it }
}
operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
this.value = value
}
}