/*
* Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* Licensed 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 cascading.tuple.hadoop;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.Comparator;
import cascading.CascadingException;
import cascading.tuple.StreamComparator;
import cascading.tuple.hadoop.io.BufferedInputStream;
import org.apache.hadoop.io.WritableUtils;
/** Class BytesComparator is used to compare arrays of bytes. */
public class TestTextComparator implements StreamComparator<BufferedInputStream>, Comparator<TestText>, Serializable
{
@Override
public int compare( TestText lhs, TestText rhs )
{
if( lhs == rhs )
return 0;
if( lhs == null )
return -1;
if( rhs == null )
return 1;
if( lhs.value == null && rhs.value == null )
return 0;
if( lhs.value == null )
return -1;
if( rhs.value == null )
return 1;
return lhs.value.compareTo( rhs.value );
}
@Override
public int compare( BufferedInputStream lhsStream, BufferedInputStream rhsStream )
{
try
{
if( lhsStream == null && rhsStream == null )
return 0;
if( lhsStream == null )
{
WritableUtils.readString( new DataInputStream( rhsStream ) );
return -1;
}
if( rhsStream == null )
{
WritableUtils.readString( new DataInputStream( lhsStream ) );
return 1;
}
String lhsString = WritableUtils.readString( new DataInputStream( lhsStream ) );
String rhsString = WritableUtils.readString( new DataInputStream( rhsStream ) );
if( lhsString == null && rhsString == null )
return 0;
if( lhsString == null )
return -1;
if( rhsString == null )
return 1;
return lhsString.compareTo( rhsString );
}
catch( IOException exception )
{
throw new CascadingException( exception );
}
}
}