/* * 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.MapperIterator; 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 MapperIteratorTest extends BaseUnitTest { private static final Map<String, Integer> DATA = ImmutableMap.of( "first", 1, "second", 2, "third", 3, "forth", 4 ); private static final Function<String, Integer> MAPPER = key -> { return DATA.get(key); }; @Test public void testMapper() { AtomicInteger keysCount = new AtomicInteger(0); Iterator<String> keys = DATA.keySet().iterator(); Function<String, Integer> mapper = key -> { keysCount.incrementAndGet(); return DATA.get(key); }; Iterator<Integer> results = new MapperIterator<>(keys, mapper); List<Integer> actual = new ArrayList<>(); while (results.hasNext()) { actual.add(results.next()); } List<Integer> expected = ImmutableList.of(1, 2, 3, 4); Assert.assertEquals(4, keysCount.get()); Assert.assertEquals(expected, actual); } @Test public void testHasNext() { Iterator<String> keys = DATA.keySet().iterator(); Iterator<Integer> results = new MapperIterator<>(keys, MAPPER); Assert.assertTrue(results.hasNext()); } @Test public void testHasNextAndNextWithMultiTimes() { Iterator<String> keys = DATA.keySet().iterator(); Iterator<Integer> results = new MapperIterator<>(keys, MAPPER); for (int i = 0; i < 5; i++) { Assert.assertTrue(results.hasNext()); } for (int i = 0; i < 4; 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 MapperIterator<>(keys, MAPPER); // Call next() without hasNext() results.next(); } @Test public void testNextWithMultiTimes() { Iterator<String> keys = DATA.keySet().iterator(); Iterator<Integer> results = new MapperIterator<>(keys, MAPPER); for (int i = 0; i < 4; i++) { results.next(); } Assert.assertThrows(NoSuchElementException.class, () -> { results.next(); }); } @Test public void testMapperReturnNullThenHasNext() { Iterator<String> keys = ImmutableList.of("fifth").iterator(); Iterator<Integer> results = new MapperIterator<>(keys, key -> { return null; }); Assert.assertFalse(results.hasNext()); } @Test public void testMapperReturnNullThenNext() { Iterator<String> keys = ImmutableList.of("fifth").iterator(); Iterator<Integer> results = new MapperIterator<>(keys, key -> { return null; }); Assert.assertThrows(NoSuchElementException.class, () -> { results.next(); }); } @Test public void testClose() throws Exception { CloseableItor<String> keys = new CloseableItor<>( ImmutableList.of("fifth").iterator()); MapperIterator<String, Integer> results = new MapperIterator<>(keys, k -> null); Assert.assertFalse(keys.closed()); results.close(); Assert.assertTrue(keys.closed()); } }