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/*
* Copyright (C) 2007 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 com.google.common.collect.Sets;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import junit.framework.TestCase;
/**
* Base test case class for I/O tests.
*
* @author Chris Nokleberg
* @author Colin Decker
*/
public abstract class IoTestCase extends TestCase {
private static final Logger logger = Logger.getLogger(IoTestCase.class.getName());
static final String I18N =
"\u00CE\u00F1\u0163\u00E9\u0072\u00F1\u00E5\u0163\u00EE\u00F6"
+ "\u00F1\u00E5\u013C\u00EE\u017E\u00E5\u0163\u00EE\u00F6\u00F1";
static final String ASCII =
" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
private File testDir;
private File tempDir;
private final Set<File> filesToDelete = Sets.newHashSet();
@Override
protected void tearDown() {
for (File file : filesToDelete) {
if (file.exists()) {
delete(file);
}
}
filesToDelete.clear();
}
private File getTestDir() throws IOException {
if (testDir != null) {
return testDir;
}
URL testFileUrl = IoTestCase.class.getResource("testdata/i18n.txt");
if (testFileUrl == null) {
throw new RuntimeException("unable to locate testdata directory");
}
if (testFileUrl.getProtocol().equals("file")) {
try {
File testFile = new File(testFileUrl.toURI());
testDir = testFile.getParentFile(); // the testdata directory
} catch (Exception ignore) {
// probably URISyntaxException or IllegalArgumentException
// fall back to copying URLs to files in the testDir == null block below
}
}
if (testDir == null) {
// testdata resources aren't file:// urls, so create a directory to store them in and then
// copy the resources to the filesystem as needed
testDir = createTempDir();
}
return testDir;
}
/** Returns the file with the given name under the testdata directory. */
protected final File getTestFile(String name) throws IOException {
File file = new File(getTestDir(), name);
if (!file.exists()) {
URL resourceUrl = IoTestCase.class.getResource("testdata/" + name);
if (resourceUrl == null) {
return null;
}
copy(resourceUrl, file);
}
return file;
}
/**
* Creates a new temp dir for testing. The returned directory and all contents of it will be
* deleted in the tear-down for this test.
*/
protected final File createTempDir() throws IOException {
File tempFile = File.createTempFile("IoTestCase", "");
if (!tempFile.delete() || !tempFile.mkdir()) {
throw new IOException("failed to create temp dir");
}
filesToDelete.add(tempFile);
return tempFile;
}
/**
* Gets a temp dir for testing. The returned directory and all contents of it will be deleted in
* the tear-down for this test. Subsequent invocations of this method will return the same
* directory.
*/
protected final File getTempDir() throws IOException {
if (tempDir == null) {
tempDir = createTempDir();
}
return tempDir;
}
/**
* Creates a new temp file in the temp directory returned by {@link #getTempDir()}. The file will
* be deleted in the tear-down for this test.
*/
protected final File createTempFile() throws IOException {
return File.createTempFile("test", null, getTempDir());
}
/** Returns a byte array of length size that has values 0 .. size - 1. */
static byte[] newPreFilledByteArray(int size) {
return newPreFilledByteArray(0, size);
}
/** Returns a byte array of length size that has values offset .. offset + size - 1. */
static byte[] newPreFilledByteArray(int offset, int size) {
byte[] array = new byte[size];
for (int i = 0; i < size; i++) {
array[i] = (byte) (offset + i);
}
return array;
}
private static void copy(URL url, File file) throws IOException {
InputStream in = url.openStream();
try {
OutputStream out = new FileOutputStream(file);
try {
byte[] buf = new byte[4096];
for (int read = in.read(buf); read != -1; read = in.read(buf)) {
out.write(buf, 0, read);
}
} finally {
out.close();
}
} finally {
in.close();
}
}
@CanIgnoreReturnValue
private boolean delete(File file) {
if (file.isDirectory()) {
File[] files = file.listFiles();
if (files != null) {
for (File f : files) {
if (!delete(f)) {
return false;
}
}
}
}
if (!file.delete()) {
logger.log(Level.WARNING, "couldn't delete file: {0}", new Object[] {file});
return false;
}
return true;
}
}
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