/*
* Copyright (C) 2015 José Paumard
*
* Licensed 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.paumard.spliterators;
import org.paumard.spliterators.util.TryAdvanceCheckingSpliterator;
import org.paumard.streams.StreamsUtils;
import org.testng.annotations.Test;
import java.util.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import static org.assertj.core.api.Assertions.assertThat;
public class GroupingOnGatingClosedOpenedSpliteratorTest {
@Test
public void should_group_an_empty_stream_into_an_empty_stream() {
// Given
// a trick to create an empty ORDERED stream
Stream<String> strings = Stream.of("one").filter(s -> s.isEmpty());
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingOnGatingStream = StreamsUtils.group(strings, open, true, close, false);
long numberOfGroupedSteams = groupingOnGatingStream.count();
// Then
assertThat(numberOfGroupedSteams).isEqualTo(0);
}
@Test
public void should_group_a_non_empty_stream_with_correct_substreams_content() {
// Given
Stream<String> strings = Stream.of("1", "o", "2", "3", "c", "4", "5", "6", "o", "7", "8", "c", "9");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(strings, open, true, close, false);
List<List<String>> collect = groupingStream.map(st -> st.collect(Collectors.toList())).collect(Collectors.toList());
// When
assertThat(collect.size()).isEqualTo(2);
assertThat(collect.get(0)).containsExactly("o", "2", "3");
assertThat(collect.get(1)).containsExactly("o", "7", "8");
}
@Test
public void should_group_a_non_empty_stream_with_correct_substreams_content_even_if_last_stream_is_incomplete() {
// Given
Stream<String> strings = Stream.of("1", "o", "2", "3", "c", "4", "5", "6", "o", "7", "8", "c", "9", "o");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(strings, open, true, close, false);
List<List<String>> collect = groupingStream.map(st -> st.collect(Collectors.toList())).collect(Collectors.toList());
// When
assertThat(collect.size()).isEqualTo(3);
assertThat(collect.get(0)).containsExactly("o", "2", "3");
assertThat(collect.get(1)).containsExactly("o", "7", "8");
assertThat(collect.get(2)).containsExactly("o");
}
@Test
public void should_group_a_non_empty_stream_with_correct_substreams_content_even_if_more_than_one_opener() {
// Given
Stream<String> strings = Stream.of("1", "o", "o", "2", "3", "c", "4", "5", "6", "o", "7", "8", "c", "9");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(strings, open, true, close, false);
List<List<String>> collect = groupingStream.map(st -> st.collect(Collectors.toList())).collect(Collectors.toList());
// When
assertThat(collect.size()).isEqualTo(2);
assertThat(collect.get(0)).containsExactly("o", "o", "2", "3");
assertThat(collect.get(1)).containsExactly("o", "7", "8");
}
@Test
public void should_group_a_non_empty_stream_with_correct_substreams_content_even_if_more_than_one_closer() {
// Given
Stream<String> strings = Stream.of("1", "o", "2", "3", "c", "4", "c", "5", "6", "o", "7", "8", "c", "9");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(strings, open, true, close, false);
List<List<String>> collect = groupingStream.map(st -> st.collect(Collectors.toList())).collect(Collectors.toList());
// When
assertThat(collect.size()).isEqualTo(2);
assertThat(collect.get(0)).containsExactly("o", "2", "3");
assertThat(collect.get(1)).containsExactly("o", "7", "8");
}
@Test
public void should_group_a_non_empty_stream_with_correct_substreams_content_with_opener_and_closer_at_first_and_last_position() {
// Given
Stream<String> strings = Stream.of("o", "1", "2", "3", "4", "5", "6", "7", "8", "9", "c");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(strings, open, true, close, false);
List<List<String>> collect = groupingStream.map(st -> st.collect(Collectors.toList())).collect(Collectors.toList());
// When
assertThat(collect.size()).isEqualTo(1);
assertThat(collect.get(0)).containsExactly("o", "1", "2", "3", "4", "5", "6", "7", "8", "9");
}
@Test
public void should_group_a_sorted_stream_correctly_and_in_an_unsorted_stream() {
// Given
SortedSet<String> sortedSet = new TreeSet<>(Arrays.asList("o", "1", "2", "3", "4", "5", "6", "7", "8", "9", "c"));
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
Stream<Stream<String>> groupingStream = StreamsUtils.group(sortedSet.stream(), open, true, close, false);
// Then
assertThat(groupingStream.spliterator().characteristics() & Spliterator.SORTED).isEqualTo(0);
}
@Test
public void should_conform_to_specified_trySplit_behavior() {
// Given
Stream<String> strings = Stream.of("o", "1", "2", "3", "4", "5", "6", "7", "8", "9", "c");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
Stream<Stream<String>> testedStream = StreamsUtils.group(strings, open, true, close, false);
TryAdvanceCheckingSpliterator<Stream<String>> spliterator = new TryAdvanceCheckingSpliterator<>(testedStream.spliterator());
Stream<String> monitoredStream = StreamSupport.stream(spliterator, false).flatMap(Function.identity());
// When
long count = monitoredStream.count();
// Then
assertThat(count).isEqualTo(10L);
}
@Test
public void should_correctly_call_the_onClose_callbacks_of_the_underlying_streams() {
// Given
AtomicBoolean b = new AtomicBoolean(false);
Stream<String> strings = Stream.of("o", "1", "2", "3", "4", "5", "6", "7", "8", "9", "c").onClose(() -> b.set(true));
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
// When
StreamsUtils.group(strings, open, true, close, false).close();
// Then
assertThat(b.get()).isEqualTo(true);
}
@Test
public void should_correctly_count_the_elements_of_a_sized_stream() {
// Given
Stream<String> strings = Stream.of("o", "1", "2", "3", "4", "5", "6", "7", "8", "9", "c");
Predicate<String> open = s -> s.startsWith("o");
Predicate<String> close = s -> s.startsWith("c");
Stream<Stream<String>> stream = StreamsUtils.group(strings, open, true, close, false);
// When
long count = stream.count();
// Then
assertThat(count).isEqualTo(1L);
}
}
