TestRollupDimensions.java example

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 * to you 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
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 */
package org.apache.pig.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.util.Set;

import org.apache.pig.builtin.RollupDimensions;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.junit.Test;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;

public class TestRollupDimensions {

    private static TupleFactory TF = TupleFactory.getInstance();

    @Test
    public void testCube() throws IOException {
	Tuple t = TF.newTuple(ImmutableList.of("a", "b", "c"));
	Set<Tuple> expected = ImmutableSet.of(
		TF.newTuple(ImmutableList.of("a", "b", "c")),
		TF.newTuple(ImmutableList.of("a", "b", "NULL")),
		TF.newTuple(ImmutableList.of("a", "NULL", "NULL")),
		TF.newTuple(ImmutableList.of("NULL", "NULL", "NULL"))
		);

	RollupDimensions rd = new RollupDimensions("NULL");
	DataBag bag = rd.exec(t);
	assertEquals(bag.size(), expected.size());

	for (Tuple tup : bag) {
	    assertTrue(expected.contains(tup));
	}
    }
}