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/*
* 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 test.io
import kotlin.test.*
import java.io.File
import java.io.Reader
import java.io.StringReader
import java.net.URL
import java.util.ArrayList
fun sample(): Reader = StringReader("Hello\nWorld");
class ReadWriteTest {
@Test fun testAppendText() {
val file = File.createTempFile("temp", System.nanoTime().toString())
file.writeText("Hello\n")
file.appendText("World\n")
file.appendText("Again")
assertEquals("Hello\nWorld\nAgain", file.readText())
assertEquals(listOf("Hello", "World", "Again"), file.readLines(Charsets.UTF_8))
file.deleteOnExit()
}
@Test fun reader() {
val list = ArrayList<String>()
/* TODO would be nicer maybe to write this as
reader.lines.forEach { ... }
as we could one day maybe write that as
for (line in reader.lines)
if the for(elem in thing) {...} statement could act as syntax sugar for
thing.forEach{ elem -> ... }
if thing is not an Iterable/array/Iterator but has a suitable forEach method
*/
sample().forEachLine {
list.add(it)
}
assertEquals(listOf("Hello", "World"), list)
assertEquals(listOf("Hello", "World"), sample().readLines())
sample().useLines {
assertEquals(listOf("Hello", "World"), it.toList())
}
var reader = StringReader("")
var c = 0
reader.forEachLine { c++ }
assertEquals(0, c)
reader = StringReader(" ")
reader.forEachLine { c++ }
assertEquals(1, c)
reader = StringReader(" \n")
c = 0
reader.forEachLine { c++ }
assertEquals(1, c)
reader = StringReader(" \n ")
c = 0
reader.forEachLine { c++ }
assertEquals(2, c)
}
@Test fun file() {
val file = File.createTempFile("temp", System.nanoTime().toString())
val writer = file.outputStream().writer().buffered()
writer.write("Hello")
writer.newLine()
writer.write("World")
writer.close()
//file.replaceText("Hello\nWorld")
file.forEachBlock { arr: ByteArray, size: Int ->
assertTrue(size >= 11 && size <= 12, size.toString())
assertTrue(arr.contains('W'.toByte()))
}
val list = ArrayList<String>()
file.forEachLine(Charsets.UTF_8, {
list.add(it)
})
assertEquals(arrayListOf("Hello", "World"), list)
assertEquals(arrayListOf("Hello", "World"), file.readLines())
file.useLines {
assertEquals(arrayListOf("Hello", "World"), it.toList())
}
val text = file.inputStream().reader().readText()
assertTrue(text.contains("Hello"))
assertTrue(text.contains("World"))
file.writeText("")
var c = 0
file.forEachLine { c++ }
assertEquals(0, c)
file.writeText(" ")
file.forEachLine { c++ }
assertEquals(1, c)
file.writeText(" \n")
c = 0
file.forEachLine { c++ }
assertEquals(1, c)
file.writeText(" \n ")
c = 0
file.forEachLine { c++ }
assertEquals(2, c)
file.deleteOnExit()
}
@Test fun testUse() {
val list = ArrayList<String>()
val reader = sample().buffered()
reader.use {
while (true) {
val line = it.readLine()
if (line != null)
list.add(line)
else
break
}
}
assertEquals(arrayListOf("Hello", "World"), list)
}
@Test fun testPlatformNullUse() {
fun <T> platformNull() = @Suppress("UNCHECKED_CAST") java.util.Collections.singleton(null as T).first()
val resource = platformNull<java.io.Closeable>()
val result = resource.use {
"ok"
}
assertEquals("ok", result)
}
@Test fun testURL() {
val url = URL("http://kotlinlang.org")
val text = url.readText()
assertFalse(text.isEmpty())
val text2 = url.readText(charset("UTF8"))
assertFalse(text2.isEmpty())
}
}
class LineIteratorTest {
@Test fun useLines() {
// TODO we should maybe zap the useLines approach as it encourages
// use of iterators which don't close the underlying stream
val list1 = sample().useLines { it.toList() }
val list2 = sample().useLines<ArrayList<String>>{ it.toCollection(arrayListOf()) }
assertEquals(listOf("Hello", "World"), list1)
assertEquals(listOf("Hello", "World"), list2)
}
@Test fun manualClose() {
val reader = sample().buffered()
try {
val list = reader.lineSequence().toList()
assertEquals(arrayListOf("Hello", "World"), list)
} finally {
reader.close()
}
}
@Test fun boundaryConditions() {
var reader = StringReader("").buffered()
assertEquals(emptyList(), reader.lineSequence().toList())
reader.close()
reader = StringReader(" ").buffered()
assertEquals(listOf(" "), reader.lineSequence().toList())
reader.close()
reader = StringReader(" \n").buffered()
assertEquals(listOf(" "), reader.lineSequence().toList())
reader.close()
reader = StringReader(" \n ").buffered()
assertEquals(listOf(" ", " "), reader.lineSequence().toList())
reader.close()
}
}
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