354 lines
10 KiB
Java
354 lines
10 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.*;
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import java.util.Arrays;
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import java.util.Random;
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import jdk.test.lib.RandomFactory;
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import static java.lang.String.format;
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/*
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* @test
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* @bug 8191706
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* @summary tests whether java.io.Reader.transferTo conforms to its
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* contract defined source the javadoc
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* @library /test/lib
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* @build jdk.test.lib.RandomFactory
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* @run main TransferTo
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* @key randomness
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* @author Patrick Reinhart
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*/
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public class TransferTo {
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private static Random generator = RandomFactory.getRandom();
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public static void main(String[] args) throws IOException {
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ifOutIsNullThenNpeIsThrown();
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ifExceptionInInputNeitherStreamIsClosed();
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ifExceptionInOutputNeitherStreamIsClosed();
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onReturnNeitherStreamIsClosed();
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onReturnInputIsAtEnd();
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contents();
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}
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private static void ifOutIsNullThenNpeIsThrown() throws IOException {
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try (Reader in = input()) {
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assertThrowsNPE(() -> in.transferTo(null), "out");
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}
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try (Reader in = input((char) 1)) {
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assertThrowsNPE(() -> in.transferTo(null), "out");
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}
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try (Reader in = input((char) 1, (char) 2)) {
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assertThrowsNPE(() -> in.transferTo(null), "out");
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}
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Reader in = null;
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try {
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Reader fin = in = new ThrowingReader();
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// null check should precede everything else:
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// Reader shouldn't be touched if Writer is null
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assertThrowsNPE(() -> fin.transferTo(null), "out");
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} finally {
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if (in != null)
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try {
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in.close();
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} catch (IOException ignored) { }
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}
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}
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private static void ifExceptionInInputNeitherStreamIsClosed()
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throws IOException {
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transferToThenCheckIfAnyClosed(input(0, new char[]{1, 2, 3}), output());
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transferToThenCheckIfAnyClosed(input(1, new char[]{1, 2, 3}), output());
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transferToThenCheckIfAnyClosed(input(2, new char[]{1, 2, 3}), output());
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}
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private static void ifExceptionInOutputNeitherStreamIsClosed()
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throws IOException {
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transferToThenCheckIfAnyClosed(input(new char[]{1, 2, 3}), output(0));
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transferToThenCheckIfAnyClosed(input(new char[]{1, 2, 3}), output(1));
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transferToThenCheckIfAnyClosed(input(new char[]{1, 2, 3}), output(2));
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}
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private static void transferToThenCheckIfAnyClosed(Reader input,
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Writer output)
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throws IOException {
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try (CloseLoggingReader in = new CloseLoggingReader(input);
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CloseLoggingWriter out =
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new CloseLoggingWriter(output)) {
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boolean thrown = false;
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try {
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in.transferTo(out);
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} catch (IOException ignored) {
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thrown = true;
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}
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if (!thrown)
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throw new AssertionError();
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if (in.wasClosed() || out.wasClosed()) {
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throw new AssertionError();
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}
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}
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}
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private static void onReturnNeitherStreamIsClosed()
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throws IOException {
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try (CloseLoggingReader in =
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new CloseLoggingReader(input(new char[]{1, 2, 3}));
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CloseLoggingWriter out =
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new CloseLoggingWriter(output())) {
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in.transferTo(out);
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if (in.wasClosed() || out.wasClosed()) {
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throw new AssertionError();
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}
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}
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}
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private static void onReturnInputIsAtEnd() throws IOException {
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try (Reader in = input(new char[]{1, 2, 3});
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Writer out = output()) {
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in.transferTo(out);
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if (in.read() != -1) {
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throw new AssertionError();
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}
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}
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}
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private static void contents() throws IOException {
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checkTransferredContents(new char[0]);
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checkTransferredContents(createRandomChars(1024, 4096));
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// to span through several batches
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checkTransferredContents(createRandomChars(16384, 16384));
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}
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private static void checkTransferredContents(char[] chars)
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throws IOException {
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try (Reader in = input(chars);
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StringWriter out = new StringWriter()) {
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in.transferTo(out);
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char[] outChars = out.toString().toCharArray();
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if (!Arrays.equals(chars, outChars)) {
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throw new AssertionError(
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format("chars.length=%s, outChars.length=%s",
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chars.length, outChars.length));
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}
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}
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}
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private static char[] createRandomChars(int min, int maxRandomAdditive) {
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char[] chars = new char[min + generator.nextInt(maxRandomAdditive)];
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for (int index=0; index<chars.length; index++) {
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chars[index] = (char)generator.nextInt();
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}
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return chars;
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}
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private static Writer output() {
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return output(-1);
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}
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private static Writer output(int exceptionPosition) {
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return new Writer() {
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int pos;
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@Override
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public void write(int b) throws IOException {
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if (pos++ == exceptionPosition)
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throw new IOException();
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}
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@Override
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public void write(char[] chars, int off, int len) throws IOException {
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for (int i=0; i<len; i++) {
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write(chars[off + i]);
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}
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}
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@Override
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public Writer append(CharSequence csq, int start, int end) throws IOException {
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for (int i = start; i < end; i++) {
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write(csq.charAt(i));
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}
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return this;
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}
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@Override
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public void flush() throws IOException {
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}
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@Override
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public void close() throws IOException {
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}
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};
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}
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private static Reader input(char... chars) {
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return input(-1, chars);
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}
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private static Reader input(int exceptionPosition, char... chars) {
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return new Reader() {
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int pos;
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@Override
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public int read() throws IOException {
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if (pos == exceptionPosition) {
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throw new IOException();
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}
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if (pos >= chars.length)
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return -1;
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return chars[pos++];
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}
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@Override
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public int read(char[] cbuf, int off, int len) throws IOException {
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int c = read();
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if (c == -1) {
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return -1;
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}
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cbuf[off] = (char)c;
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int i = 1;
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for (; i < len ; i++) {
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c = read();
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if (c == -1) {
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break;
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}
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cbuf[off + i] = (char)c;
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}
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return i;
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}
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@Override
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public void close() throws IOException {
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}
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};
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}
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private static class ThrowingReader extends Reader {
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boolean closed;
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@Override
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public int read(char[] b, int off, int len) throws IOException {
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throw new IOException();
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}
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@Override
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public void close() throws IOException {
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if (!closed) {
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closed = true;
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throw new IOException();
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}
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}
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@Override
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public int read() throws IOException {
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throw new IOException();
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}
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}
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private static class CloseLoggingReader extends FilterReader {
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boolean closed;
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CloseLoggingReader(Reader in) {
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super(in);
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}
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@Override
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public void close() throws IOException {
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closed = true;
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super.close();
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}
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boolean wasClosed() {
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return closed;
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}
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}
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private static class CloseLoggingWriter extends FilterWriter {
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boolean closed;
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CloseLoggingWriter(Writer out) {
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super(out);
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}
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@Override
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public void close() throws IOException {
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closed = true;
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super.close();
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}
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boolean wasClosed() {
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return closed;
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}
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}
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public interface Thrower {
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public void run() throws Throwable;
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}
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public static void assertThrowsNPE(Thrower thrower, String message) {
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assertThrows(thrower, NullPointerException.class, message);
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}
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public static <T extends Throwable> void assertThrows(Thrower thrower,
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Class<T> throwable,
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String message) {
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Throwable thrown;
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try {
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thrower.run();
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thrown = null;
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} catch (Throwable caught) {
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thrown = caught;
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}
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if (!throwable.isInstance(thrown)) {
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String caught = thrown == null ?
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"nothing" : thrown.getClass().getCanonicalName();
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throw new AssertionError(
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format("Expected to catch %s, but caught %s",
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throwable, caught), thrown);
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}
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if (thrown != null && !message.equals(thrown.getMessage())) {
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throw new AssertionError(
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format("Expected exception message to be '%s', but it's '%s'",
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message, thrown.getMessage()));
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}
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}
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}
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