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/*
* Copyright (C) 2008 The Guava Authors
*
* 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.io;
import static com.google.common.base.StandardSystemProperty.JAVA_IO_TMPDIR;
import static com.google.common.base.StandardSystemProperty.OS_NAME;
import static com.google.common.truth.Truth.assertThat;
import static java.nio.file.attribute.PosixFilePermission.OWNER_READ;
import static java.nio.file.attribute.PosixFilePermission.OWNER_WRITE;
import static org.junit.Assert.assertThrows;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.util.Arrays;
/**
* Unit tests for {@link FileBackedOutputStream}.
*
* <p>For a tiny bit more testing, see {@link FileBackedOutputStreamAndroidIncompatibleTest}.
*
* @author Chris Nokleberg
*/
public class FileBackedOutputStreamTest extends IoTestCase {
public void testThreshold() throws Exception {
testThreshold(0, 100, true, false);
testThreshold(10, 100, true, false);
testThreshold(100, 100, true, false);
testThreshold(1000, 100, true, false);
testThreshold(0, 100, false, false);
testThreshold(10, 100, false, false);
testThreshold(100, 100, false, false);
testThreshold(1000, 100, false, false);
}
private void testThreshold(
int fileThreshold, int dataSize, boolean singleByte, boolean resetOnFinalize)
throws IOException {
byte[] data = newPreFilledByteArray(dataSize);
FileBackedOutputStream out = new FileBackedOutputStream(fileThreshold, resetOnFinalize);
ByteSource source = out.asByteSource();
int chunk1 = Math.min(dataSize, fileThreshold);
int chunk2 = dataSize - chunk1;
// Write just enough to not trip the threshold
if (chunk1 > 0) {
write(out, data, 0, chunk1, singleByte);
assertTrue(ByteSource.wrap(data).slice(0, chunk1).contentEquals(source));
}
File file = out.getFile();
assertNull(file);
// Write data to go over the threshold
if (chunk2 > 0) {
if (JAVA_IO_TMPDIR.value().equals("/sdcard")) {
assertThrows(IOException.class, () -> write(out, data, chunk1, chunk2, singleByte));
return;
}
write(out, data, chunk1, chunk2, singleByte);
file = out.getFile();
assertEquals(dataSize, file.length());
assertTrue(file.exists());
assertThat(file.getName()).contains("FileBackedOutputStream");
if (!isAndroid() && !isWindows()) {
PosixFileAttributes attributes =
java.nio.file.Files.getFileAttributeView(file.toPath(), PosixFileAttributeView.class)
.readAttributes();
assertThat(attributes.permissions()).containsExactly(OWNER_READ, OWNER_WRITE);
}
}
out.close();
// Check that source returns the right data
assertTrue(Arrays.equals(data, source.read()));
// Make sure that reset deleted the file
out.reset();
if (file != null) {
assertFalse(file.exists());
}
}
public void testThreshold_resetOnFinalize() throws Exception {
testThreshold(0, 100, true, true);
testThreshold(10, 100, true, true);
testThreshold(100, 100, true, true);
testThreshold(1000, 100, true, true);
testThreshold(0, 100, false, true);
testThreshold(10, 100, false, true);
testThreshold(100, 100, false, true);
testThreshold(1000, 100, false, true);
}
static void write(OutputStream out, byte[] b, int off, int len, boolean singleByte)
throws IOException {
if (singleByte) {
for (int i = off; i < off + len; i++) {
out.write(b[i]);
}
} else {
out.write(b, off, len);
}
out.flush(); // for coverage
}
// TODO(chrisn): only works if we ensure we have crossed file threshold
public void testWriteErrorAfterClose() throws Exception {
byte[] data = newPreFilledByteArray(100);
FileBackedOutputStream out = new FileBackedOutputStream(50);
ByteSource source = out.asByteSource();
if (JAVA_IO_TMPDIR.value().equals("/sdcard")) {
assertThrows(IOException.class, () -> out.write(data));
return;
}
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.close();
assertThrows(IOException.class, () -> out.write(42));
// Verify that write had no effect
assertTrue(Arrays.equals(data, source.read()));
out.reset();
}
public void testReset() throws Exception {
byte[] data = newPreFilledByteArray(100);
FileBackedOutputStream out = new FileBackedOutputStream(Integer.MAX_VALUE);
ByteSource source = out.asByteSource();
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.reset();
assertTrue(Arrays.equals(new byte[0], source.read()));
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.close();
}
private static boolean isAndroid() {
return System.getProperty("java.runtime.name", "").contains("Android");
}
private static boolean isWindows() {
return OS_NAME.value().startsWith("Windows");
}
}
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