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• Optionals.kt

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com.seeq.utilities.Optionals.kt Maven / Gradle / Ivy

package com.seeq.utilities

import java.util.Optional

/** Convert from Java's Optional to Kotlin's nullable. If the Optional is empty then this function will return null. */
inline val  Optional.asNullable: T? get() = this.orElse(null)

/** Convert from a nullable Kotlin value to [Optional], using [Optional.ofNullable]. */
inline val  T?.asOptional: Optional get() = Optional.ofNullable(this)

/**
 * Helper for conditionally applying a nullable argument to a fluent builder.
 * If [x] is `null`, `this` is returned. Otherwise the value is applied to `this.`[fn], returning the updated builder.
 *
 * ```kt
 *   fooBuilder
 *      .withX(x)
 *      .maybe(y) { withY(it) }
 *      .withZ(z)
 * ```
 */
inline fun  A.maybe(x: B?, fn: A.(B) -> A): A = x?.let { this.fn(it) } ?: this