Remove obsolete testData (Filter.kt — didn't run even once).
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@@ -1,60 +0,0 @@
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package kotlin
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import java.util.*
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import java.lang.Iterable // WTF?
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/*
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Filters given iterator
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*/
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fun <T> java.util.Iterator<T>.filter(f: (T) -> Boolean): java.util.Iterator<T> = FilterIterator<T>(this, f)
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/*
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Adds filtered elements in to given container
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*/
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fun <T, U : Collection<in T>> java.lang.Iterable<T>.filterTo(var container: U, filter: (T) -> Boolean): U {
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for (element in this) {
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if (filter(element))
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container.add(element)
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}
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return container
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}
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/*
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Create iterator filtering given java.lang.Iterable
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*/
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/*
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fun <T> java.lang.Iterable<T>.filter(f: (T)->Boolean) : java.util.Iterator<T> = (iterator() as java.util.Iterator<T>).filter(f)
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*/
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private class FilterIterator<T>(val original: java.util.Iterator<T>, val filter: (T) -> Boolean) : java.util.Iterator<T> {
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var state = 0
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var nextElement: T? = null
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override fun hasNext(): Boolean =
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when(state) {
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1 -> true // checked and next present
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2 -> false // checked and next not present
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else -> {
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while (original.hasNext()) {
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val candidate = original.next()
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if ((filter)(candidate)) {
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nextElement = candidate
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state = 1
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true
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}
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}
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state = 2
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false
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}
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}
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override fun next(): T =
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if (state != 1)
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throw java.util.NoSuchElementException()
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else {
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val res = nextElement as T
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nextElement = null
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state = 0
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res
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}
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}
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