| /* |
| * 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.tinkerpop.gremlin.util.iterator; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.util.FastNoSuchElementException; |
| import org.junit.Test; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import static org.hamcrest.CoreMatchers.is; |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| |
| /** |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public class MultiIteratorTest { |
| @Test |
| public void shouldNotHaveNextIfNoIteratorsAreAdded() { |
| final Iterator<String> itty = new MultiIterator<>(); |
| assertFalse(itty.hasNext()); |
| } |
| |
| @Test(expected = FastNoSuchElementException.class) |
| public void shouldThrowFastNoSuchElementExceptionIfNoIteratorsAreAdded() { |
| final Iterator<String> itty = new MultiIterator<>(); |
| itty.next(); |
| } |
| |
| @Test |
| public void shouldNotHaveNextIfEmptyIteratorIsAdded() { |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(EmptyIterator.instance()); |
| assertFalse(itty.hasNext()); |
| } |
| |
| @Test(expected = FastNoSuchElementException.class) |
| public void shouldThrowFastNoSuchElementExceptionIfEmptyIteratorIsAdded() { |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.next(); |
| } |
| |
| @Test |
| public void shouldNotHaveNextIfEmptyIteratorsAreAdded() { |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| assertFalse(itty.hasNext()); |
| } |
| |
| @Test(expected = FastNoSuchElementException.class) |
| public void shouldThrowFastNoSuchElementExceptionIfEmptyIteratorsAreAdded() { |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.next(); |
| } |
| |
| @Test |
| public void shouldIterateWhenMultipleIteratorsAreAdded() { |
| final List<String> list = new ArrayList<>(); |
| list.add("test1"); |
| list.add("test2"); |
| list.add("test3"); |
| |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(EmptyIterator.instance()); |
| itty.addIterator(list.iterator()); |
| |
| assertThat(itty.hasNext(), is(true)); |
| assertEquals("test1", itty.next()); |
| assertEquals("test2", itty.next()); |
| assertEquals("test3", itty.next()); |
| assertFalse(itty.hasNext()); |
| } |
| |
| @Test |
| public void shouldClearIterators() { |
| final List<String> list = new ArrayList<>(); |
| list.add("test1"); |
| list.add("test2"); |
| list.add("test3"); |
| |
| final MultiIterator<String> itty = new MultiIterator<>(); |
| itty.addIterator(list.iterator()); |
| |
| itty.clear(); |
| |
| assertFalse(itty.hasNext()); |
| } |
| } |