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.InputStream;
025import java.util.Properties;
026
027import cascading.flow.FlowProcess;
028import cascading.scheme.Scheme;
029import cascading.tap.SourceTap;
030import cascading.tuple.TupleEntryIterator;
031import cascading.tuple.TupleEntrySchemeIterator;
032
033/** Class StdInTap provides a local mode tap for reading data from the {@code stdin} stream. */
034public class StdInTap extends SourceTap<Properties, InputStream>
035  {
036  public StdInTap( Scheme<Properties, InputStream, ?, ?, ?> scheme )
037    {
038    super( scheme );
039    }
040
041  @Override
042  public String getIdentifier()
043    {
044    return "stdIn";
045    }
046
047  @Override
048  public TupleEntryIterator openForRead( FlowProcess<? extends Properties> flowProcess, InputStream inputStream ) throws IOException
049    {
050    return new TupleEntrySchemeIterator<Properties, InputStream>( flowProcess, getScheme(), System.in );
051    }
052
053  @Override
054  public boolean resourceExists( Properties conf ) throws IOException
055    {
056    return true;
057    }
058
059  @Override
060  public long getModifiedTime( Properties conf ) throws IOException
061    {
062    return System.currentTimeMillis();
063    }
064  }