libraries/tools/kotlin-stdlib-gen/src/templates/Guards.kt

/*
 * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
 * that can be found in the license/LICENSE.txt file.
 */

package templates

import templates.Family.*
import templates.SequenceClass.*

object Guards : TemplateGroupBase() {
    private val THIS = "\$this"

    val f_requireNoNulls = fn("requireNoNulls()") {
        include(Iterables, Sequences, InvariantArraysOfObjects, Lists)
    } builder {
        doc { "Returns an original collection containing all the non-`null` elements, throwing an [IllegalArgumentException] if there are any `null` elements." }
        sequenceClassification(intermediate, stateless)
        typeParam("T : Any")
        toNullableT = true
        returns("SELF")
        body {
            """
            for (element in this) {
                if (element == null) {
                    throw IllegalArgumentException("null element found in $THIS.")
                }
            }
            @Suppress("UNCHECKED_CAST")
            return this as SELF
            """
        }
        body(Sequences) {
            """
            return map { it ?: throw IllegalArgumentException("null element found in $THIS.") }
            """
        }
    }
}