/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hdfs;

import junit.framework.TestCase;
import java.io.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;


/**
 * This class tests that the DFS command mkdirs cannot create subdirectories
 * from a file when passed an illegal path.  HADOOP-281.
 */
public class TestDFSMkdirs extends TestCase {

  private void writeFile(FileSystem fileSys, Path name) throws IOException {
    DataOutputStream stm = fileSys.create(name);
    stm.writeBytes("wchien");
    stm.close();
  }
  
  /**
   * Tests mkdirs can create a directory that does not exist and will
   * not create a subdirectory off a file.
   */
  public void testDFSMkdirs() throws IOException {
    Configuration conf = new HdfsConfiguration();
    MiniDFSCluster cluster = new MiniDFSCluster(conf, 2, true, null);
    FileSystem fileSys = cluster.getFileSystem();
    try {
      // First create a new directory with mkdirs
      Path myPath = new Path("/test/mkdirs");
      assertTrue(fileSys.mkdirs(myPath));
      assertTrue(fileSys.exists(myPath));
      assertTrue(fileSys.mkdirs(myPath));

      // Second, create a file in that directory.
      Path myFile = new Path("/test/mkdirs/myFile");
      writeFile(fileSys, myFile);
   
      // Third, use mkdir to create a subdirectory off of that file,
      // and check that it fails.
      Path myIllegalPath = new Path("/test/mkdirs/myFile/subdir");
      Boolean exist = true;
      try {
        fileSys.mkdirs(myIllegalPath);
      } catch (IOException e) {
        exist = false;
      }
      assertFalse(exist);
      assertFalse(fileSys.exists(myIllegalPath));
      fileSys.delete(myFile, true);
    	
    } finally {
      fileSys.close();
      cluster.shutdown();
    }
  }
  
  /**
   * Tests mkdir will not create directory when parent is missing.
   */
  public void testMkdir() throws IOException {
    Configuration conf = new HdfsConfiguration();
    MiniDFSCluster cluster = new MiniDFSCluster(conf, 2, true, null);
    DistributedFileSystem dfs = (DistributedFileSystem) cluster.getFileSystem();
    try {
      // Create a dir in root dir, should succeed
      assertTrue(dfs.mkdir(new Path("/mkdir-" + System.currentTimeMillis()),
          FsPermission.getDefault()));
      // Create a dir when parent dir exists as a file, should fail
      IOException expectedException = null;
      String filePath = "/mkdir-file-" + System.currentTimeMillis();
      writeFile(dfs, new Path(filePath));
      try {
        dfs.mkdir(new Path(filePath + "/mkdir"), FsPermission.getDefault());
      } catch (IOException e) {
        expectedException = e;
      }
      assertTrue("Create a directory when parent dir exists as file using"
          + " mkdir() should throw FileAlreadyExistsException ",
          expectedException != null
              && expectedException instanceof FileAlreadyExistsException);
      // Create a dir in a non-exist directory, should fail
      expectedException = null;
      try {
        dfs.mkdir(new Path("/non-exist/mkdir-" + System.currentTimeMillis()),
            FsPermission.getDefault());
      } catch (IOException e) {
        expectedException = e;
      }
      assertTrue("Create a directory in a non-exist parent dir using"
          + " mkdir() should throw FileNotFoundException ",
          expectedException != null
              && expectedException instanceof FileNotFoundException);
    } finally {
      dfs.close();
      cluster.shutdown();
    }
  }
}