/*
* 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.operation.filter;
import cascading.CascadingTestCase;
import cascading.operation.ConcreteCall;
import cascading.operation.Filter;
import cascading.tuple.Fields;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
import org.junit.Test;
/**
*
*/
public class SampleFilterTest extends CascadingTestCase
{
private ConcreteCall operationCall;
public SampleFilterTest()
{
super();
}
@Override
public void setUp() throws Exception
{
super.setUp();
operationCall = new ConcreteCall();
}
private TupleEntry getEntry( Tuple tuple )
{
return new TupleEntry( Fields.size( tuple.size() ), tuple );
}
@Test
public void testSample()
{
for( double i = 0; i < 1; i = i + .01 )
performSampleTest( i, 100000 );
}
private void performSampleTest( double sample, int values )
{
Filter filter = new Sample( sample );
int count = 0;
filter.prepare( null, operationCall );
operationCall.setArguments( getEntry( new Tuple( 1 ) ) );
for( int j = 0; j < values; j++ )
{
if( !filter.isRemove( null, operationCall ) )
count++;
}
String message = String.format( "sample:%f values:%d", sample, values );
assertEquals( message, sample, (double) count / values, 1 );
}
}