While.kt

/*
 * Copyright 2018 Makoto Consulting Group, Inc
 *
 *    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.
 *
 */

/**
 * Demonstrates the while loop
 */
fun demoIntIterator(intArray: IntArray) {
    println("********** WhileLoop.demoIntIterator() **********")
    val iterator = intArray.iterator()
    while (iterator.hasNext()) {
        val int = iterator.next()
        println("The number: $int")
    }
    println("Loop is done.")
}

/**
 * Loop until [timeout] milliseconds have passed, then `break`
 */
fun demoLoopWithBreak(timeout: Long) {
    println("********** WhileLoop.demoLoopWithBreak($timeout) **********")
    val startTime = System.currentTimeMillis()
    println("Start time: $startTime")
    while (true) {
        val currentTime = System.currentTimeMillis()
        if (currentTime > startTime + timeout) {
            // Time to go
            break
        }
    }
    println("Stopped at: ${System.currentTimeMillis()}")
}

/**
 * Demonstrates the do/while loop
 */
fun demoStringIterator(stringArray: Array<String>) {
    println("********** DoWhileLoop.demoStringIterator **********")
    val iterator = stringArray.iterator()
    val stringAccum = StringBuilder()
    if (iterator.hasNext()) do {
        val string = iterator.next()
        stringAccum.append(string)
        stringAccum.append('|')
    } while (iterator.hasNext())
    println("Loop is done.")
    println("The accumulated string: $stringAccum")
}

/**
 * The ubiquitous main() function, we meet again.
 */
fun mainWhile() { // fun main(args: Array<String>) {
    demoIntIterator(intArray)
    demoIntIterator(emptyIntArray)
    demoLoopWithBreak(10)

    demoStringIterator(stringArray)
    demoStringIterator(emptyStringArray)
}