| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.unit.iterator; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.function.Function; |
| |
| import org.junit.Test; |
| |
| import com.baidu.hugegraph.iterator.FlatMapperIterator; |
| import com.baidu.hugegraph.testutil.Assert; |
| import com.baidu.hugegraph.unit.BaseUnitTest; |
| import com.baidu.hugegraph.unit.iterator.ExtendableIteratorTest.CloseableItor; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableMap; |
| |
| @SuppressWarnings("resource") |
| public class FlatMapperIteratorTest extends BaseUnitTest { |
| |
| private static final Map<String, List<Integer>> DATA = ImmutableMap.of( |
| "first", ImmutableList.of(11), |
| "second", ImmutableList.of(21, 22), |
| "third", ImmutableList.of(31, 32, 33), |
| "forth", ImmutableList.of(41, 42, 43, 44) |
| ); |
| |
| private static final Function<String, Iterator<Integer>> MAPPER = key -> { |
| List<Integer> value = DATA.get(key); |
| if (value == null) { |
| return ImmutableList.<Integer>of().iterator(); |
| } |
| return value.iterator(); |
| }; |
| |
| @Test |
| public void testFlatMapper() { |
| |
| AtomicInteger keysCount = new AtomicInteger(0); |
| |
| Iterator<String> keys = DATA.keySet().iterator(); |
| |
| Function<String, Iterator<Integer>> mapper = key -> { |
| keysCount.incrementAndGet(); |
| |
| return DATA.get(key).iterator(); |
| }; |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, mapper); |
| |
| List<Integer> actual = new ArrayList<>(); |
| while (results.hasNext()) { |
| actual.add(results.next()); |
| } |
| |
| List<Integer> expected = ImmutableList.of(11, |
| 21, 22, |
| 31, 32, 33, |
| 41, 42, 43, 44); |
| Assert.assertEquals(4, keysCount.get()); |
| Assert.assertEquals(expected, actual); |
| } |
| |
| @Test |
| public void testHasNext() { |
| Iterator<String> keys = DATA.keySet().iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, MAPPER); |
| Assert.assertTrue(results.hasNext()); |
| } |
| |
| @Test |
| public void testHasNextAndNextWithMultiTimes() { |
| Iterator<String> keys = DATA.keySet().iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, MAPPER); |
| |
| for (int i = 0; i < 12; i++) { |
| Assert.assertTrue(results.hasNext()); |
| } |
| |
| for (int i = 0; i < 10; i++) { |
| results.next(); |
| } |
| |
| Assert.assertFalse(results.hasNext()); |
| Assert.assertFalse(results.hasNext()); |
| |
| Assert.assertThrows(NoSuchElementException.class, () -> { |
| results.next(); |
| }); |
| Assert.assertThrows(NoSuchElementException.class, () -> { |
| results.next(); |
| }); |
| } |
| |
| @Test |
| public void testNext() { |
| Iterator<String> keys = DATA.keySet().iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, MAPPER); |
| // Call next() without hasNext() |
| results.next(); |
| } |
| |
| @Test |
| public void testNextWithMultiTimes() { |
| Iterator<String> keys = DATA.keySet().iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, MAPPER); |
| for (int i = 0; i < 10; i++) { |
| results.next(); |
| } |
| Assert.assertThrows(NoSuchElementException.class, () -> { |
| results.next(); |
| }); |
| } |
| |
| @Test |
| public void testMapperReturnNullThenHasNext() { |
| Iterator<String> keys = ImmutableList.of("fifth").iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, key -> { |
| Assert.assertNull(DATA.get(key)); |
| return null; |
| }); |
| Assert.assertFalse(results.hasNext()); |
| Assert.assertFalse(results.hasNext()); |
| } |
| |
| @Test |
| public void testMapperReturnNullThenNext() { |
| Iterator<String> keys = ImmutableList.of("fifth").iterator(); |
| |
| Iterator<Integer> results = new FlatMapperIterator<>(keys, key -> { |
| Assert.assertNull(DATA.get(key)); |
| return null; |
| }); |
| Assert.assertThrows(NoSuchElementException.class, () -> { |
| results.next(); |
| }); |
| Assert.assertThrows(NoSuchElementException.class, () -> { |
| results.next(); |
| }); |
| } |
| |
| @Test |
| public void testClose() throws Exception { |
| CloseableItor<String> vals = new CloseableItor<>( |
| DATA.keySet().iterator()); |
| |
| FlatMapperIterator<String, Integer> results; |
| results = new FlatMapperIterator<>(vals, |
| key -> DATA.get(key).iterator()); |
| |
| Assert.assertFalse(vals.closed()); |
| results.close(); |
| Assert.assertTrue(vals.closed()); |
| } |
| } |