Java example source code file (FileTreeTraverserTest.java)

This example Java source code file (FileTreeTraverserTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

file, filetreetraversertest, ioexception, override, testcase

The FileTreeTraverserTest.java Java example source code

/*
 * Copyright (C) 2012 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.ImmutableSet;

import junit.framework.TestCase;

import java.io.File;
import java.io.IOException;

/**
 * Tests for {@link Files#fileTreeViewer}.
 *
 * @author Colin Decker
 */

public class FileTreeTraverserTest extends TestCase {

  private File dir;

  @Override
  public void setUp() throws IOException {
    dir = Files.createTempDir();
  }

  @Override
  public void tearDown() throws IOException {
    File[] files = dir.listFiles();
    if (files == null) {
      return;
    }

    // we aren't creating any files in subdirs
    for (File file : files) {
      file.delete();
    }

    dir.delete();
  }

  public void testFileTreeViewer_emptyDir() throws IOException {
    assertDirChildren();
  }

  public void testFileTreeViewer_singleFile() throws IOException {
    File file = newFile("test");
    assertDirChildren(file);
  }

  public void testFileTreeViewer_singleDir() throws IOException {
    File file = newDir("test");
    assertDirChildren(file);
  }

  public void testFileTreeViewer_multipleFiles() throws IOException {
    File a = newFile("a");
    File b = newDir("b");
    File c = newFile("c");
    File d = newDir("d");
    assertDirChildren(a, b, c, d);
  }

  private File newDir(String name) throws IOException {
    File file = new File(dir, name);
    file.mkdir();
    return file;
  }

  private File newFile(String name) throws IOException {
    File file = new File(dir, name);
    file.createNewFile();
    return file;
  }

  private void assertDirChildren(File... files) {
    assertEquals(ImmutableSet.copyOf(files),
        ImmutableSet.copyOf(Files.fileTreeTraverser().children(dir)));
  }
}