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/*
* Copyright (C) 2017 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.truth.Truth.assertThat;
import com.google.common.collect.Iterables;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import junit.framework.TestCase;
/**
* Tests for {@link Files#fileTraverser()}.
*
* @author Jens Nyman
*/
public class FilesFileTraverserTest extends TestCase {
private File rootDir;
@Override
public void setUp() throws IOException {
rootDir = Files.createTempDir();
}
@Override
public void tearDown() throws IOException {
// delete rootDir and its contents
java.nio.file.Files.walkFileTree(
rootDir.toPath(),
new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
throws IOException {
java.nio.file.Files.deleteIfExists(file);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
if (exc != null) {
return FileVisitResult.TERMINATE;
}
java.nio.file.Files.deleteIfExists(dir);
return FileVisitResult.CONTINUE;
}
});
}
public void testFileTraverser_emptyDirectory() throws Exception {
assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir);
}
public void testFileTraverser_nonExistingFile() throws Exception {
File file = new File(rootDir, "file-that-doesnt-exist");
assertThat(Files.fileTraverser().breadthFirst(file)).containsExactly(file);
}
public void testFileTraverser_file() throws Exception {
File file = newFile("some-file");
assertThat(Files.fileTraverser().breadthFirst(file)).containsExactly(file);
}
public void testFileTraverser_singleFile() throws Exception {
File file = newFile("some-file");
assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
}
public void testFileTraverser_singleDirectory() throws Exception {
File file = newDir("some-dir");
assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
}
public void testFileTraverser_multipleFilesAndDirectories() throws Exception {
File fileA = newFile("file-a");
File fileB = newFile("file-b");
File dir1 = newDir("dir-1");
File dir2 = newDir("dir-2");
assertThat(Files.fileTraverser().breadthFirst(rootDir))
.containsExactly(rootDir, fileA, fileB, dir1, dir2);
}
public void testFileTraverser_multipleDirectoryLayers_breadthFirstStartsWithTopLayer()
throws Exception {
File fileA = newFile("file-a");
File dir1 = newDir("dir-1");
newFile("dir-1/file-b");
newFile("dir-1/dir-2");
assertThat(Iterables.limit(Files.fileTraverser().breadthFirst(rootDir), 3))
.containsExactly(rootDir, fileA, dir1);
}
public void testFileTraverser_multipleDirectoryLayers_traversalReturnsAll() throws Exception {
File fileA = newFile("file-a");
File dir1 = newDir("dir-1");
File fileB = newFile("dir-1/file-b");
File dir2 = newFile("dir-1/dir-2");
assertThat(Files.fileTraverser().breadthFirst(rootDir))
.containsExactly(rootDir, fileA, fileB, dir1, dir2);
}
@CanIgnoreReturnValue
private File newDir(String name) {
File file = new File(rootDir, name);
file.mkdir();
return file;
}
@CanIgnoreReturnValue
private File newFile(String name) throws IOException {
File file = new File(rootDir, name);
file.createNewFile();
return file;
}
}
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