content: /*
   * Copyright 2015, 2024 StreamEx contributors
   *
   * 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 one.util.streamex;
  
  import org.junit.Test;
  
  import java.util.*;
  import java.util.function.Supplier;
  
  import static one.util.streamex.TestHelpers.checkSpliterator;
  import static one.util.streamex.TestHelpers.consumeElement;
  import static org.junit.Assert.*;
  
  public class IfEmptySpliteratorTest {
      @Test
      public void testSpliterator() {
          List<Integer> data = IntStreamEx.range(1000).boxed().toList();
          checkSpliterator("++", data, () -> new IfEmptySpliterator<>(data.spliterator(), data.spliterator()));
          checkSpliterator("-+", data, () -> new IfEmptySpliterator<>(Spliterators.emptySpliterator(), data.spliterator()));
          checkSpliterator("+-", data, () -> new IfEmptySpliterator<>(data.spliterator(), Spliterators.emptySpliterator()));
          checkSpliterator("--", Collections.emptyList(), () -> new IfEmptySpliterator<>(Spliterators.emptySpliterator(), Spliterators.emptySpliterator()));
      }
  
      @Test
      public void testCharacteristics() {
          Spliterator<String> sortedSpltr = StreamEx.of("foo", "bar", "baz").sorted().ifEmpty(
              StreamEx.of("foo", "bar", "baz").sorted()).spliterator();
          assertFalse(sortedSpltr.hasCharacteristics(Spliterator.SORTED));
          consumeElement(sortedSpltr, "bar");
          assertFalse(sortedSpltr.hasCharacteristics(Spliterator.SORTED));
          assertTrue(StreamEx.of("foo", "bar", "baz").ifEmpty(StreamEx.of(new HashSet<>())).spliterator()
                  .hasCharacteristics(Spliterator.ORDERED));
          List<String> list = Collections.singletonList("foo");
          Spliterator<String> spliterator = StreamEx.<String>empty().ifEmpty(list.stream()).spliterator();
          consumeElement(spliterator, "foo");
          assertEquals(list.spliterator().characteristics(), spliterator.characteristics());
      }
  
      @Test
      public void testSize() {
          Spliterator<String> spliterator = StreamEx.of("foo", "bar", "baz").ifEmpty("qux").spliterator();
          assertEquals(3, spliterator.getExactSizeIfKnown());
          consumeElement(spliterator, "foo");
          assertEquals(2, spliterator.getExactSizeIfKnown());
          assertEquals(1, StreamEx.empty().ifEmpty("qux").spliterator().getExactSizeIfKnown());
      }
  
      @Test
      public void testFiltered() {
          List<Integer> data = IntStreamEx.range(1000).boxed().toList();
          Supplier<Spliterator<Integer>> allMatch = () -> data.parallelStream().filter(x -> x >= 0).spliterator();
          Supplier<Spliterator<Integer>> noneMatch = () -> data.parallelStream().filter(x -> x < 0).spliterator();
          Supplier<Spliterator<Integer>> lastMatch = () -> data.parallelStream().filter(x -> x == 999).spliterator();
          checkSpliterator("++", data, () -> new IfEmptySpliterator<>(allMatch.get(), allMatch.get()));
          checkSpliterator("l+", Collections.singletonList(999), () -> new IfEmptySpliterator<>(lastMatch.get(), allMatch.get()));
          checkSpliterator("-+", data, () -> new IfEmptySpliterator<>(noneMatch.get(), allMatch.get()));
          checkSpliterator("+-", data, () -> new IfEmptySpliterator<>(allMatch.get(), noneMatch.get()));
          checkSpliterator("--", Collections.emptyList(), () -> new IfEmptySpliterator<>(noneMatch.get(), noneMatch.get()));
      }
  }
  