/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.collections;
import com.metamx.common.guava.nary.BinaryFn;
import io.druid.query.Result;
import org.joda.time.DateTime;
import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
/**
*/
public class CombiningIterableTest
{
@Test
public void testMerge()
{
List<Result<Object>> resultsBefore = Arrays.asList(
new Result<Object>(new DateTime("2011-01-01"), 1L),
new Result<Object>(new DateTime("2011-01-01"), 2L)
);
Iterable<Result<Object>> expectedResults = Arrays.<Result<Object>>asList(
new Result<Object>(new DateTime("2011-01-01"), 3L)
);
Iterable<Result<Object>> resultsAfter = CombiningIterable.create(
resultsBefore,
new Comparator<Result<Object>>()
{
@Override
public int compare(Result<Object> r1, Result<Object> r2)
{
return r1.getTimestamp().compareTo(r2.getTimestamp());
}
},
new BinaryFn<Result<Object>, Result<Object>, Result<Object>>()
{
@Override
public Result<Object> apply(final Result<Object> arg1, final Result<Object> arg2)
{
if (arg1 == null) {
return arg2;
}
if (arg2 == null) {
return arg1;
}
return new Result<Object>(
arg1.getTimestamp(),
((Long) arg1.getValue()).longValue() + ((Long) arg2.getValue()).longValue()
);
}
}
);
Iterator<Result<Object>> it1 = expectedResults.iterator();
Iterator<Result<Object>> it2 = resultsAfter.iterator();
while (it1.hasNext() && it2.hasNext()) {
Result r1 = it1.next();
Result r2 = it2.next();
Assert.assertEquals(r1.getTimestamp(), r2.getTimestamp());
Assert.assertEquals(r1.getValue(), r2.getValue());
}
}
}