| /* |
| * 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.flink.util; |
| |
| import org.junit.Test; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.fail; |
| |
| /** |
| * Tests for the {@link UnionIterator}. |
| */ |
| public class UnionIteratorTest { |
| |
| @Test |
| public void testUnion() { |
| try { |
| UnionIterator<Integer> iter = new UnionIterator<>(); |
| |
| // should succeed and be empty |
| assertFalse(iter.iterator().hasNext()); |
| |
| iter.clear(); |
| |
| try { |
| iter.iterator().next(); |
| fail("should fail with an exception"); |
| } catch (NoSuchElementException e) { |
| // expected |
| } |
| |
| iter.clear(); |
| iter.addList(Arrays.asList(1, 2, 3, 4, 5, 6, 7)); |
| iter.addList(Collections.<Integer>emptyList()); |
| iter.addList(Arrays.asList(8, 9, 10, 11)); |
| |
| int val = 1; |
| for (int i : iter) { |
| assertEquals(val++, i); |
| } |
| } |
| catch (Exception e) { |
| e.printStackTrace(); |
| fail(e.getMessage()); |
| } |
| } |
| |
| @Test |
| public void testTraversableOnce() { |
| try { |
| UnionIterator<Integer> iter = new UnionIterator<>(); |
| |
| // should succeed |
| iter.iterator(); |
| |
| // should fail |
| try { |
| iter.iterator(); |
| fail("should fail with an exception"); |
| } catch (TraversableOnceException e) { |
| // expected |
| } |
| |
| // should fail again |
| try { |
| iter.iterator(); |
| fail("should fail with an exception"); |
| } catch (TraversableOnceException e) { |
| // expected |
| } |
| |
| // reset the thing, keep it empty |
| iter.clear(); |
| |
| // should succeed |
| iter.iterator(); |
| |
| // should fail |
| try { |
| iter.iterator(); |
| fail("should fail with an exception"); |
| } catch (TraversableOnceException e) { |
| // expected |
| } |
| |
| // should fail again |
| try { |
| iter.iterator(); |
| fail("should fail with an exception"); |
| } catch (TraversableOnceException e) { |
| // expected |
| } |
| |
| // reset the thing, add some data |
| iter.clear(); |
| iter.addList(Arrays.asList(1, 2, 3, 4, 5, 6, 7)); |
| |
| // should succeed |
| Iterator<Integer> ints = iter.iterator(); |
| assertNotNull(ints.next()); |
| assertNotNull(ints.next()); |
| assertNotNull(ints.next()); |
| |
| // should fail if called in the middle of operations |
| try { |
| iter.iterator(); |
| fail("should fail with an exception"); |
| } catch (TraversableOnceException e) { |
| // expected |
| } |
| |
| // reset the thing, keep it empty |
| iter.clear(); |
| |
| // should succeed again |
| assertFalse(iter.iterator().hasNext()); |
| |
| } |
| catch (Exception e) { |
| e.printStackTrace(); |
| fail(e.getMessage()); |
| } |
| } |
| } |