| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * 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 |
| * 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 org.apache.pig.builtin; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.pig.builtin.SUBTRACT; |
| import org.apache.pig.data.BagFactory; |
| import org.apache.pig.data.DataBag; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.data.TupleFactory; |
| import org.junit.Test; |
| |
| public class TestSUBTRACT { |
| |
| private static SUBTRACT subtract = new SUBTRACT(); |
| |
| @Test |
| public void testSubtractBags() throws IOException { |
| Tuple input = TupleFactory.getInstance().newTuple(2); |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| input.set(1, bag(tuple("item1"), tuple("item4"), tuple("item5"))); |
| assertBagContainsOnly(subtract.exec(input), tuple("item2"), tuple("item3")); |
| |
| // Note that "item2" which appears several times in first bag, is not in the resulting bag |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item2"), tuple("item3"), tuple("item4"))); |
| input.set(1, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| assertBagContainsOnly(subtract.exec(input), tuple("item4")); |
| |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"), tuple("item4"))); |
| input.set(1, bag(tuple("item2"), tuple("item3"), tuple("item1"))); |
| assertBagContainsOnly(subtract.exec(input), tuple("item4")); |
| |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| input.set(1, bag(tuple("item1"), tuple("item2"), tuple("item3"), tuple("item4"))); |
| assertEquals(0, subtract.exec(input).size()); |
| |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| input.set(1, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| assertEquals(0, subtract.exec(input).size()); |
| |
| input.set(0, bag()); |
| input.set(1, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| assertEquals(0, subtract.exec(input).size()); |
| |
| // null treated like empty bag |
| input.set(0, null); |
| input.set(1, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| assertEquals(0, subtract.exec(input).size()); |
| |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| input.set(1, bag()); |
| assertBagContainsOnly(subtract.exec(input), tuple("item1"), tuple("item2"), tuple("item3")); |
| |
| // null treated like empty bag |
| input.set(0, bag(tuple("item1"), tuple("item2"), tuple("item3"))); |
| input.set(1, null); |
| assertBagContainsOnly(subtract.exec(input), tuple("item1"), tuple("item2"), tuple("item3")); |
| } |
| |
| @Test |
| public void testShouldThrowAnIOExceptionAsInputDoesNotContainDataBagOnly() { |
| Tuple input = TupleFactory.getInstance().newTuple(2); |
| try { |
| input.set(0, "2012/05/05"); |
| input.set(1, bag()); |
| subtract.exec(input); |
| fail("IOException Expected"); |
| } catch (IOException e) { |
| assertEquals("Expecting input to be DataBag only but was 'String'", e.getMessage()); |
| } |
| } |
| |
| @Test |
| public void testShouldThrowAnIOExceptionAsInputDoesNotHaveTwoElements() { |
| Tuple input = TupleFactory.getInstance().newTuple(1); |
| try { |
| input.set(0, bag()); |
| subtract.exec(input); |
| fail("IOException Expected"); |
| } catch (IOException e) { |
| assertEquals("SUBTRACT expected two inputs but received 1 inputs.", e.getMessage()); |
| } |
| |
| input = TupleFactory.getInstance().newTuple(3); |
| try { |
| input.set(0, bag()); |
| input.set(1, bag()); |
| input.set(2, bag()); |
| subtract.exec(input); |
| fail("IOException Expected"); |
| } catch (IOException e) { |
| assertEquals("SUBTRACT expected two inputs but received 3 inputs.", e.getMessage()); |
| } |
| } |
| |
| // utility assertion method |
| |
| /** |
| * Checks that given {@link DataBag} contains only the given {@link Tuple}s. |
| * @param bag the {@link DataBag} to check |
| * @param tuples the {@link Tuple}s expected in given {@link DataBag} |
| */ |
| private static void assertBagContainsOnly(DataBag bag, Tuple... tuples) { |
| Iterator<Tuple> bagTuplesIterator = bag.iterator(); |
| List<Tuple> bagTuplesList = new ArrayList<Tuple>(); |
| while (bagTuplesIterator.hasNext()) { |
| bagTuplesList.add(bagTuplesIterator.next()); |
| } |
| assertEquals("Wrong bag size", tuples.length, bagTuplesList.size()); |
| // bag has same size as given tuples, let's see if each tuple is in bag. |
| for (Tuple tuple : tuples) { |
| assertTrue("Tuple not found in bag " + tuple, bagTuplesList.contains(tuple)); |
| } |
| } |
| |
| // utility methods to build bags, tuples and list |
| |
| private static <E> List<E> list(E... elements) { |
| if (elements == null) { |
| return new ArrayList<E>(); |
| } |
| List<E> list = new ArrayList<E>(); |
| for (E element : elements) { |
| list.add(element); |
| } |
| return list; |
| } |
| |
| private static Tuple tuple(Object... elements) { |
| if (elements == null) { |
| return TupleFactory.getInstance().newTuple(); |
| } |
| return TupleFactory.getInstance().newTuple(list(elements)); |
| } |
| |
| private static DataBag bag(Tuple... tuples) { |
| if (tuples == null) { |
| return BagFactory.getInstance().newDefaultBag(); |
| } |
| return BagFactory.getInstance().newDefaultBag(list(tuples)); |
| } |
| |
| } |