| /* |
| * 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.beam.fn.harness.state; |
| |
| import static org.junit.Assert.assertArrayEquals; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNotEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterables; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterators; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.ExpectedException; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link LazyCachingIteratorToIterable}. */ |
| @RunWith(JUnit4.class) |
| public class LazyCachingIteratorToIterableTest { |
| @Rule public ExpectedException thrown = ExpectedException.none(); |
| |
| @Test |
| public void testEmptyIterator() { |
| Iterable<Object> iterable = new LazyCachingIteratorToIterable<>(Iterators.forArray()); |
| assertArrayEquals(new Object[0], Iterables.toArray(iterable, Object.class)); |
| // iterate multiple times |
| assertArrayEquals(new Object[0], Iterables.toArray(iterable, Object.class)); |
| |
| thrown.expect(NoSuchElementException.class); |
| iterable.iterator().next(); |
| } |
| |
| @Test |
| public void testInterleavedIteration() { |
| Iterable<String> iterable = |
| new LazyCachingIteratorToIterable<>(Iterators.forArray("A", "B", "C")); |
| |
| Iterator<String> iterator1 = iterable.iterator(); |
| assertTrue(iterator1.hasNext()); |
| assertEquals("A", iterator1.next()); |
| Iterator<String> iterator2 = iterable.iterator(); |
| assertTrue(iterator2.hasNext()); |
| assertEquals("A", iterator2.next()); |
| assertTrue(iterator2.hasNext()); |
| assertEquals("B", iterator2.next()); |
| assertTrue(iterator1.hasNext()); |
| assertEquals("B", iterator1.next()); |
| assertTrue(iterator1.hasNext()); |
| assertEquals("C", iterator1.next()); |
| assertFalse(iterator1.hasNext()); |
| assertTrue(iterator2.hasNext()); |
| assertEquals("C", iterator2.next()); |
| assertFalse(iterator2.hasNext()); |
| |
| thrown.expect(NoSuchElementException.class); |
| iterator1.next(); |
| } |
| |
| @Test |
| public void testEqualsAndHashCode() { |
| Iterable<String> iterA = new LazyCachingIteratorToIterable<>(Iterators.forArray("A", "B", "C")); |
| Iterable<String> iterB = new LazyCachingIteratorToIterable<>(Iterators.forArray("A", "B", "C")); |
| Iterable<String> iterC = new LazyCachingIteratorToIterable<>(Iterators.forArray()); |
| Iterable<String> iterD = new LazyCachingIteratorToIterable<>(Iterators.forArray()); |
| assertEquals(iterA, iterB); |
| assertEquals(iterC, iterD); |
| assertNotEquals(iterA, iterC); |
| assertEquals(iterA.hashCode(), iterB.hashCode()); |
| assertEquals(iterC.hashCode(), iterD.hashCode()); |
| } |
| } |