    001    /*
    002     * Copyright (c) 2007-2014 Concurrent, 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
    021    package cascading.tap.local.io;
    022
    023    import java.io.File;
    024    import java.io.FileNotFoundException;
    025    import java.io.FileOutputStream;
    026
    027    import cascading.tap.Tap;
    028    import cascading.tap.TapException;
    029
    030    /**
    031     *
    032     */
    033    public 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      }