    001/*
    002 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.tap.local.io;
    022
    023import java.io.File;
    024import java.io.FileNotFoundException;
    025import java.io.FileOutputStream;
    026
    027import cascading.tap.Tap;
    028import cascading.tap.TapException;
    029
    030/**
    031 *
    032 */
    033public class TapFileOutputStream extends FileOutputStream
    034  {
    035  public TapFileOutputStream( String path, boolean append ) throws FileNotFoundException
    036    {
    037    super( prepare( null, path ), append );
    038    }
    039
    040  public TapFileOutputStream( Tap parent, String path, boolean update ) throws FileNotFoundException
    041    {
    042    super( prepare( parent, path ), update );
    043    }
    044
    045  private static String prepare( Tap parent, String path )
    046    {
    047    File file;
    048
    049    if( parent == null )
    050      file = new File( path );
    051    else
    052      file = new File( parent.getIdentifier(), path );
    053
    054    // ignore the output. will catch the failure downstream if any.
    055    // not ignoring the output causes race conditions with other systems writing to the same directory.
    056    File parentFile = file.getAbsoluteFile().getParentFile();
    057
    058    if( parentFile != null && parentFile.exists() && parentFile.isFile() )
    059      throw new TapException( "cannot create parent directory, it already exists as a file: " + parentFile.getAbsolutePath() );
    060
    061    // don't test for success, just fighting a race condition otherwise
    062    // will get caught downstream
    063    if( parentFile != null )
    064      parentFile.mkdirs();
    065
    066    return file.getAbsolutePath();
    067    }
    068  }