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/*
* Copyright (C) 2009, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.util.io;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import org.junit.Test;
public class UnionInputStreamTest {
@Test
public void testEmptyStream() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
assertTrue(u.isEmpty());
assertEquals(-1, u.read());
assertEquals(-1, u.read(new byte[1], 0, 1));
assertEquals(0, u.available());
assertEquals(0, u.skip(1));
}
}
@Test
public void testReadSingleBytes() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
assertTrue(u.isEmpty());
u.add(new ByteArrayInputStream(new byte[] { 1, 0, 2 }));
u.add(new ByteArrayInputStream(new byte[] { 3 }));
u.add(new ByteArrayInputStream(new byte[] { 4, 5 }));
assertFalse(u.isEmpty());
assertEquals(3, u.available());
assertEquals(1, u.read());
assertEquals(0, u.read());
assertEquals(2, u.read());
assertEquals(0, u.available());
assertEquals(3, u.read());
assertEquals(0, u.available());
assertEquals(4, u.read());
assertEquals(1, u.available());
assertEquals(5, u.read());
assertEquals(0, u.available());
assertEquals(-1, u.read());
assertTrue(u.isEmpty());
u.add(new ByteArrayInputStream(new byte[] { (byte) 255 }));
assertEquals(255, u.read());
assertEquals(-1, u.read());
assertTrue(u.isEmpty());
}
}
@Test
public void testReadByteBlocks() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
u.add(new ByteArrayInputStream(new byte[] { 1, 0, 2 }));
u.add(new ByteArrayInputStream(new byte[] { 3 }));
u.add(new ByteArrayInputStream(new byte[] { 4, 5 }));
final byte[] r = new byte[5];
assertEquals(3, u.read(r, 0, 5));
assertTrue(Arrays.equals(new byte[] { 1, 0, 2, }, slice(r, 3)));
assertEquals(1, u.read(r, 0, 5));
assertEquals(3, r[0]);
assertEquals(2, u.read(r, 0, 5));
assertTrue(Arrays.equals(new byte[] { 4, 5, }, slice(r, 2)));
assertEquals(-1, u.read(r, 0, 5));
}
}
private static byte[] slice(byte[] in, int len) {
byte[] r = new byte[len];
System.arraycopy(in, 0, r, 0, len);
return r;
}
@Test
public void testArrayConstructor() throws IOException {
try (UnionInputStream u = new UnionInputStream(
new ByteArrayInputStream(new byte[] { 1, 0, 2 }),
new ByteArrayInputStream(new byte[] { 3 }),
new ByteArrayInputStream(new byte[] { 4, 5 }))) {
final byte[] r = new byte[5];
assertEquals(3, u.read(r, 0, 5));
assertTrue(Arrays.equals(new byte[] { 1, 0, 2, }, slice(r, 3)));
assertEquals(1, u.read(r, 0, 5));
assertEquals(3, r[0]);
assertEquals(2, u.read(r, 0, 5));
assertTrue(Arrays.equals(new byte[] { 4, 5, }, slice(r, 2)));
assertEquals(-1, u.read(r, 0, 5));
}
}
@Test
public void testMarkSupported() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
assertFalse(u.markSupported());
u.add(new ByteArrayInputStream(new byte[] { 1, 0, 2 }));
assertFalse(u.markSupported());
}
}
@Test
public void testSkip() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
u.add(new ByteArrayInputStream(new byte[] { 1, 0, 2 }));
u.add(new ByteArrayInputStream(new byte[] { 3 }));
u.add(new ByteArrayInputStream(new byte[] { 4, 5 }));
assertEquals(0, u.skip(0));
assertEquals(3, u.skip(3));
assertEquals(3, u.read());
assertEquals(2, u.skip(5));
assertEquals(0, u.skip(5));
assertEquals(-1, u.read());
u.add(new ByteArrayInputStream(new byte[] { 20, 30 }) {
@Override
@SuppressWarnings("UnsynchronizedOverridesSynchronized")
// This is only used in tests and is thread-safe
public long skip(long n) {
return 0;
}
});
assertEquals(2, u.skip(8));
assertEquals(-1, u.read());
}
}
@Test
public void testAutoCloseDuringRead() throws IOException {
try (UnionInputStream u = new UnionInputStream()) {
final boolean closed[] = new boolean[2];
u.add(new ByteArrayInputStream(new byte[] { 1 }) {
@Override
public void close() {
closed[0] = true;
}
});
u.add(new ByteArrayInputStream(new byte[] { 2 }) {
@Override
public void close() {
closed[1] = true;
}
});
assertFalse(closed[0]);
assertFalse(closed[1]);
assertEquals(1, u.read());
assertFalse(closed[0]);
assertFalse(closed[1]);
assertEquals(2, u.read());
assertTrue(closed[0]);
assertFalse(closed[1]);
assertEquals(-1, u.read());
assertTrue(closed[0]);
assertTrue(closed[1]);
}
}
@Test
public void testCloseDuringClose() throws IOException {
final boolean closed[] = new boolean[2];
try (UnionInputStream u = new UnionInputStream()) {
u.add(new ByteArrayInputStream(new byte[] { 1 }) {
@Override
public void close() {
closed[0] = true;
}
});
u.add(new ByteArrayInputStream(new byte[] { 2 }) {
@Override
public void close() {
closed[1] = true;
}
});
assertFalse(closed[0]);
assertFalse(closed[1]);
}
assertTrue(closed[0]);
assertTrue(closed[1]);
}
@Test
public void testExceptionDuringClose() {
@SuppressWarnings("resource") // We are testing the close() method
final UnionInputStream u = new UnionInputStream();
u.add(new ByteArrayInputStream(new byte[] { 1 }) {
@Override
public void close() throws IOException {
throw new IOException("I AM A TEST");
}
});
try {
u.close();
fail("close ignored inner stream exception");
} catch (IOException e) {
assertEquals("I AM A TEST", e.getMessage());
}
}
@Test
public void testNonBlockingPartialRead() throws Exception {
InputStream errorReadStream = new InputStream() {
@Override
public int read() throws IOException {
throw new IOException("Expected");
}
@Override
public int read(byte b[], int off, int len) throws IOException {
throw new IOException("Expected");
}
};
try (UnionInputStream u = new UnionInputStream(
new ByteArrayInputStream(new byte[] { 1, 2, 3 }),
errorReadStream)) {
byte buf[] = new byte[10];
assertEquals(3, u.read(buf, 0, 10));
assertTrue(Arrays.equals(new byte[] { 1, 2, 3 }, slice(buf, 3)));
try {
u.read(buf, 0, 1);
fail("Expected exception from errorReadStream");
} catch (IOException e) {
assertEquals("Expected", e.getMessage());
}
}
}
}
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