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/*
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.ByteArrayOutputStream;
import java.io.FilterInputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
import static java.lang.String.format;
/*
* @test
* @bug 8066867
* @summary tests whether java.io.InputStream.transferTo conforms to its
* contract defined in the javadoc
* @key randomness
*/
public class TransferTo {
public static void main(String[] args) throws IOException {
ifOutIsNullThenNpeIsThrown();
ifExceptionInInputNeitherStreamIsClosed();
ifExceptionInOutputNeitherStreamIsClosed();
onReturnNeitherStreamIsClosed();
onReturnInputIsAtEnd();
contents();
}
private static void ifOutIsNullThenNpeIsThrown() throws IOException {
try (InputStream in = input()) {
assertThrowsNPE(() -> in.transferTo(null), "out");
}
try (InputStream in = input((byte) 1)) {
assertThrowsNPE(() -> in.transferTo(null), "out");
}
try (InputStream in = input((byte) 1, (byte) 2)) {
assertThrowsNPE(() -> in.transferTo(null), "out");
}
InputStream in = null;
try {
InputStream fin = in = new ThrowingInputStream();
// null check should precede everything else:
// InputStream shouldn't be touched if OutputStream is null
assertThrowsNPE(() -> fin.transferTo(null), "out");
} finally {
if (in != null)
try {
in.close();
} catch (IOException ignored) { }
}
}
private static void ifExceptionInInputNeitherStreamIsClosed()
throws IOException {
transferToThenCheckIfAnyClosed(input(0, new byte[]{1, 2, 3}), output());
transferToThenCheckIfAnyClosed(input(1, new byte[]{1, 2, 3}), output());
transferToThenCheckIfAnyClosed(input(2, new byte[]{1, 2, 3}), output());
}
private static void ifExceptionInOutputNeitherStreamIsClosed()
throws IOException {
transferToThenCheckIfAnyClosed(input(new byte[]{1, 2, 3}), output(0));
transferToThenCheckIfAnyClosed(input(new byte[]{1, 2, 3}), output(1));
transferToThenCheckIfAnyClosed(input(new byte[]{1, 2, 3}), output(2));
}
private static void transferToThenCheckIfAnyClosed(InputStream input,
OutputStream output)
throws IOException {
try (CloseLoggingInputStream in = new CloseLoggingInputStream(input);
CloseLoggingOutputStream out =
new CloseLoggingOutputStream(output)) {
boolean thrown = false;
try {
in.transferTo(out);
} catch (IOException ignored) {
thrown = true;
}
if (!thrown)
throw new AssertionError();
if (in.wasClosed() || out.wasClosed()) {
throw new AssertionError();
}
}
}
private static void onReturnNeitherStreamIsClosed()
throws IOException {
try (CloseLoggingInputStream in =
new CloseLoggingInputStream(input(new byte[]{1, 2, 3}));
CloseLoggingOutputStream out =
new CloseLoggingOutputStream(output())) {
in.transferTo(out);
if (in.wasClosed() || out.wasClosed()) {
throw new AssertionError();
}
}
}
private static void onReturnInputIsAtEnd() throws IOException {
try (InputStream in = input(new byte[]{1, 2, 3});
OutputStream out = output()) {
in.transferTo(out);
if (in.read() != -1) {
throw new AssertionError();
}
}
}
private static void contents() throws IOException {
checkTransferredContents(new byte[0]);
checkTransferredContents(createRandomBytes(1024, 4096));
// to span through several batches
checkTransferredContents(createRandomBytes(16384, 16384));
}
private static void checkTransferredContents(byte[] bytes)
throws IOException {
try (InputStream in = input(bytes);
ByteArrayOutputStream out = new ByteArrayOutputStream()) {
in.transferTo(out);
byte[] outBytes = out.toByteArray();
if (!Arrays.equals(bytes, outBytes)) {
throw new AssertionError(
format("bytes.length=%s, outBytes.length=%s",
bytes.length, outBytes.length));
}
}
}
private static byte[] createRandomBytes(int min, int maxRandomAdditive) {
Random rnd = new Random();
byte[] bytes = new byte[min + rnd.nextInt(maxRandomAdditive)];
rnd.nextBytes(bytes);
return bytes;
}
private static OutputStream output() {
return output(-1);
}
private static OutputStream output(int exceptionPosition) {
return new OutputStream() {
int pos;
@Override
public void write(int b) throws IOException {
if (pos++ == exceptionPosition)
throw new IOException();
}
};
}
private static InputStream input(byte... bytes) {
return input(-1, bytes);
}
private static InputStream input(int exceptionPosition, byte... bytes) {
return new InputStream() {
int pos;
@Override
public int read() throws IOException {
if (pos == exceptionPosition) {
// because of the pesky IOException swallowing in
// java.io.InputStream.read(byte[], int, int)
// pos++;
throw new IOException();
}
if (pos >= bytes.length)
return -1;
return bytes[pos++] & 0xff;
}
};
}
private static class ThrowingInputStream extends InputStream {
boolean closed;
@Override
public int read(byte[] b) throws IOException {
throw new IOException();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
throw new IOException();
}
@Override
public long skip(long n) throws IOException {
throw new IOException();
}
@Override
public int available() throws IOException {
throw new IOException();
}
@Override
public void close() throws IOException {
if (!closed) {
closed = true;
throw new IOException();
}
}
@Override
public void reset() throws IOException {
throw new IOException();
}
@Override
public int read() throws IOException {
throw new IOException();
}
}
private static class CloseLoggingInputStream extends FilterInputStream {
boolean closed;
CloseLoggingInputStream(InputStream in) {
super(in);
}
@Override
public void close() throws IOException {
closed = true;
super.close();
}
boolean wasClosed() {
return closed;
}
}
private static class CloseLoggingOutputStream extends FilterOutputStream {
boolean closed;
CloseLoggingOutputStream(OutputStream out) {
super(out);
}
@Override
public void close() throws IOException {
closed = true;
super.close();
}
boolean wasClosed() {
return closed;
}
}
public interface Thrower {
public void run() throws Throwable;
}
public static void assertThrowsNPE(Thrower thrower, String message) {
assertThrows(thrower, NullPointerException.class, message);
}
public static <T extends Throwable> void assertThrows(Thrower thrower,
Class<T> throwable,
String message) {
Throwable thrown;
try {
thrower.run();
thrown = null;
} catch (Throwable caught) {
thrown = caught;
}
if (!throwable.isInstance(thrown)) {
String caught = thrown == null ?
"nothing" : thrown.getClass().getCanonicalName();
throw new AssertionError(
format("Expected to catch %s, but caught %s",
throwable, caught), thrown);
}
if (thrown != null && !message.equals(thrown.getMessage())) {
throw new AssertionError(
format("Expected exception message to be '%s', but it's '%s'",
message, thrown.getMessage()));
}
}
}
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