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;
022
023import java.io.IOException;
024import java.io.OutputStream;
025import java.util.Properties;
026
027import cascading.flow.FlowProcess;
028import cascading.scheme.Scheme;
029import cascading.tap.SinkMode;
030import cascading.tap.SinkTap;
031import cascading.tuple.TupleEntryCollector;
032import cascading.tuple.TupleEntrySchemeCollector;
033
034/** Class StdErrTap provides a local mode tap for writing data to the {@code stderr} stream. */
035public class StdErrTap extends SinkTap<Properties, OutputStream>
036  {
037  public StdErrTap( Scheme<Properties, ?, OutputStream, ?, ?> scheme )
038    {
039    super( scheme, SinkMode.UPDATE );
040    }
041
042  @Override
043  public String getIdentifier()
044    {
045    return "stdErr";
046    }
047
048  @Override
049  public TupleEntryCollector openForWrite( FlowProcess<? extends Properties> flowProcess, OutputStream output ) throws IOException
050    {
051    return new TupleEntrySchemeCollector<Properties, OutputStream>( flowProcess, getScheme(), System.err );
052    }
053
054  @Override
055  public boolean createResource( Properties conf ) throws IOException
056    {
057    return true;
058    }
059
060  @Override
061  public boolean deleteResource( Properties conf ) throws IOException
062    {
063    return false;
064    }
065
066  @Override
067  public boolean resourceExists( Properties conf ) throws IOException
068    {
069    return true;
070    }
071
072  @Override
073  public long getModifiedTime( Properties conf ) throws IOException
074    {
075    return 0;
076    }
077  }