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/*
* Copyright 2013 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.jimfs;
import static com.google.common.jimfs.TestUtils.bytes;
import static com.google.common.jimfs.TestUtils.regularFile;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.fail;
import com.google.common.util.concurrent.Runnables;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for {@link JimfsOutputStream}.
*
* @author Colin Decker
*/
@RunWith(JUnit4.class)
public class JimfsOutputStreamTest {
@Test
public void testWrite_singleByte() throws IOException {
JimfsOutputStream out = newOutputStream(false);
out.write(1);
out.write(2);
out.write(3);
assertStoreContains(out, 1, 2, 3);
}
@Test
public void testWrite_wholeArray() throws IOException {
JimfsOutputStream out = newOutputStream(false);
out.write(new byte[] {1, 2, 3, 4});
assertStoreContains(out, 1, 2, 3, 4);
}
@Test
public void testWrite_partialArray() throws IOException {
JimfsOutputStream out = newOutputStream(false);
out.write(new byte[] {1, 2, 3, 4, 5, 6}, 1, 3);
assertStoreContains(out, 2, 3, 4);
}
@Test
public void testWrite_partialArray_invalidInput() throws IOException {
JimfsOutputStream out = newOutputStream(false);
try {
out.write(new byte[3], -1, 1);
fail();
} catch (IndexOutOfBoundsException expected) {
}
try {
out.write(new byte[3], 0, 4);
fail();
} catch (IndexOutOfBoundsException expected) {
}
try {
out.write(new byte[3], 1, 3);
fail();
} catch (IndexOutOfBoundsException expected) {
}
}
@Test
public void testWrite_singleByte_appendMode() throws IOException {
JimfsOutputStream out = newOutputStream(true);
addBytesToStore(out, 9, 8, 7);
out.write(1);
out.write(2);
out.write(3);
assertStoreContains(out, 9, 8, 7, 1, 2, 3);
}
@Test
public void testWrite_wholeArray_appendMode() throws IOException {
JimfsOutputStream out = newOutputStream(true);
addBytesToStore(out, 9, 8, 7);
out.write(new byte[] {1, 2, 3, 4});
assertStoreContains(out, 9, 8, 7, 1, 2, 3, 4);
}
@Test
public void testWrite_partialArray_appendMode() throws IOException {
JimfsOutputStream out = newOutputStream(true);
addBytesToStore(out, 9, 8, 7);
out.write(new byte[] {1, 2, 3, 4, 5, 6}, 1, 3);
assertStoreContains(out, 9, 8, 7, 2, 3, 4);
}
@Test
public void testWrite_singleByte_overwriting() throws IOException {
JimfsOutputStream out = newOutputStream(false);
addBytesToStore(out, 9, 8, 7, 6, 5, 4, 3);
out.write(1);
out.write(2);
out.write(3);
assertStoreContains(out, 1, 2, 3, 6, 5, 4, 3);
}
@Test
public void testWrite_wholeArray_overwriting() throws IOException {
JimfsOutputStream out = newOutputStream(false);
addBytesToStore(out, 9, 8, 7, 6, 5, 4, 3);
out.write(new byte[] {1, 2, 3, 4});
assertStoreContains(out, 1, 2, 3, 4, 5, 4, 3);
}
@Test
public void testWrite_partialArray_overwriting() throws IOException {
JimfsOutputStream out = newOutputStream(false);
addBytesToStore(out, 9, 8, 7, 6, 5, 4, 3);
out.write(new byte[] {1, 2, 3, 4, 5, 6}, 1, 3);
assertStoreContains(out, 2, 3, 4, 6, 5, 4, 3);
}
@Test
public void testClosedOutputStream_throwsException() throws IOException {
JimfsOutputStream out = newOutputStream(false);
out.close();
try {
out.write(1);
fail();
} catch (IOException expected) {
}
try {
out.write(new byte[3]);
fail();
} catch (IOException expected) {
}
try {
out.write(new byte[10], 1, 3);
fail();
} catch (IOException expected) {
}
out.close(); // does nothing
}
@Test
public void testClosedOutputStream_doesNotThrowOnFlush() throws IOException {
JimfsOutputStream out = newOutputStream(false);
out.close();
out.flush(); // does nothing
try (JimfsOutputStream out2 = newOutputStream(false);
BufferedOutputStream bout = new BufferedOutputStream(out2);
OutputStreamWriter writer = new OutputStreamWriter(bout, UTF_8)) {
/*
* This specific scenario is why flush() shouldn't throw when the stream is already closed.
* Nesting try-with-resources like this will cause close() to be called on the
* BufferedOutputStream multiple times. Each time, BufferedOutputStream will first call
* out2.flush(), then call out2.close(). If out2.flush() throws when the stream is already
* closed, the second flush() will throw an exception. Prior to JDK8, this exception would be
* swallowed and ignored completely; in JDK8, the exception is thrown from close().
*/
}
}
private static JimfsOutputStream newOutputStream(boolean append) {
RegularFile file = regularFile(0);
return new JimfsOutputStream(file, append, new FileSystemState(Runnables.doNothing()));
}
@SuppressWarnings("GuardedByChecker")
private static void addBytesToStore(JimfsOutputStream out, int... bytes) throws IOException {
RegularFile file = out.file;
long pos = file.sizeWithoutLocking();
for (int b : bytes) {
file.write(pos++, (byte) b);
}
}
@SuppressWarnings("GuardedByChecker")
private static void assertStoreContains(JimfsOutputStream out, int... bytes) {
byte[] actualBytes = new byte[bytes.length];
out.file.read(0, actualBytes, 0, actualBytes.length);
assertArrayEquals(bytes(bytes), actualBytes);
}
}
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