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 *

 * This code is free software; you can redistribute it and/or modify it

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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 * You should have received a copy of the GNU General Public License version

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/**

 * @test

 * @run testng SpliteratorCharacteristics

 */

import org.testng.annotations.Test;

import java.util.Arrays;

import java.util.Collection;

import java.util.Comparator;

import java.util.HashMap;

import java.util.HashSet;

import java.util.LinkedHashMap;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.Map;

import java.util.PrimitiveIterator;

import java.util.Set;

import java.util.SortedMap;

import java.util.SortedSet;

import java.util.Spliterator;

import java.util.Spliterators;

import java.util.TreeMap;

import java.util.TreeSet;

import java.util.WeakHashMap;

import java.util.concurrent.ConcurrentSkipListMap;

import java.util.concurrent.ConcurrentSkipListSet;

import java.util.function.Supplier;

import java.util.stream.DoubleStream;

import java.util.stream.IntStream;

import java.util.stream.LongStream;

import static org.testng.Assert.*;

@Test

public class SpliteratorCharacteristics {

    public void testSpliteratorFromCollection() {

        List<Integer> l = Arrays.asList(1, 2, 3, 4);

        {

            Spliterator<?> s = Spliterators.spliterator(l, 0);

            assertCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(l, Spliterator.CONCURRENT);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(l.iterator( ), 1, 0);

            assertCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(l.iterator( ), 1, Spliterator.CONCURRENT);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(l.iterator( ), 0);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(

                    l.iterator(), Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

    }

    public void testSpliteratorOfIntFromIterator() {

        Supplier<PrimitiveIterator.OfInt> si = () -> IntStream.of(1, 2, 3, 4).iterator();

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, 0);

            assertCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, Spliterator.CONCURRENT);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(si.get(), 0);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(

                    si.get(), Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

    }

    public void testSpliteratorOfLongFromIterator() {

        Supplier<PrimitiveIterator.OfLong> si = () -> LongStream.of(1, 2, 3, 4).iterator();

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, 0);

            assertCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, Spliterator.CONCURRENT);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(si.get(), 0);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(

                    si.get(), Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

    }

    public void testSpliteratorOfDoubleFromIterator() {

        Supplier<PrimitiveIterator.OfDouble> si = () -> DoubleStream.of(1, 2, 3, 4).iterator();

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, 0);

            assertCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliterator(si.get(), 1, Spliterator.CONCURRENT);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

            assertCharacteristics(s, Spliterator.CONCURRENT);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(si.get(), 0);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

        {

            Spliterator<?> s = Spliterators.spliteratorUnknownSize(

                    si.get(), Spliterator.SIZED | Spliterator.SUBSIZED);

            assertHasNotCharacteristics(s, Spliterator.SIZED | Spliterator.SUBSIZED);

        }

    }

    //

    public void testHashMap() {

        assertMapCharacteristics(new HashMap<>(),

                                 Spliterator.SIZED | Spliterator.DISTINCT);

    }

    public void testWeakHashMap() {

        assertMapCharacteristics(new WeakHashMap<>(),

                                 Spliterator.DISTINCT);

    }

    public void testHashSet() {

        assertSetCharacteristics(new HashSet<>(),

                                 Spliterator.SIZED | Spliterator.DISTINCT);

    }

    public void testLinkedHashMap() {

        assertMapCharacteristics(new LinkedHashMap<>(),

                                 Spliterator.SIZED | Spliterator.DISTINCT |

                                 Spliterator.ORDERED);

    }

    public void testLinkedHashSet() {

        assertSetCharacteristics(new LinkedHashSet<>(),

                                 Spliterator.SIZED | Spliterator.DISTINCT |

                                 Spliterator.ORDERED);

    }

    public void testTreeMap() {

        assertSortedMapCharacteristics(new TreeMap<>(),

                                       Spliterator.SIZED | Spliterator.DISTINCT |

                                       Spliterator.SORTED | Spliterator.ORDERED);

    }

    public void testTreeMapWithComparator() {

        assertSortedMapCharacteristics(new TreeMap<>(Comparator.reverseOrder()),

                                       Spliterator.SIZED | Spliterator.DISTINCT |

                                       Spliterator.SORTED | Spliterator.ORDERED);

    }

    public void testTreeSet() {

        assertSortedSetCharacteristics(new TreeSet<>(),

                                       Spliterator.SIZED | Spliterator.DISTINCT |

                                       Spliterator.SORTED | Spliterator.ORDERED);

    }

    public void testTreeSetWithComparator() {

        assertSortedSetCharacteristics(new TreeSet<>(Comparator.reverseOrder()),

                                       Spliterator.SIZED | Spliterator.DISTINCT |

                                       Spliterator.SORTED | Spliterator.ORDERED);

    }

    public void testConcurrentSkipListMap() {

        assertSortedMapCharacteristics(new ConcurrentSkipListMap<>(),

                                       Spliterator.CONCURRENT | Spliterator.NONNULL |

                                       Spliterator.DISTINCT | Spliterator.SORTED |

                                       Spliterator.ORDERED);

    }

    public void testConcurrentSkipListMapWithComparator() {

        assertSortedMapCharacteristics(new ConcurrentSkipListMap<>(Comparator.<Integer>reverseOrder()),

                                       Spliterator.CONCURRENT | Spliterator.NONNULL |

                                       Spliterator.DISTINCT | Spliterator.SORTED |

                                       Spliterator.ORDERED);

    }

    public void testConcurrentSkipListSet() {

        assertSortedSetCharacteristics(new ConcurrentSkipListSet<>(),

                                       Spliterator.CONCURRENT | Spliterator.NONNULL |

                                       Spliterator.DISTINCT | Spliterator.SORTED |

                                       Spliterator.ORDERED);

    }

    public void testConcurrentSkipListSetWithComparator() {

        assertSortedSetCharacteristics(new ConcurrentSkipListSet<>(Comparator.reverseOrder()),

                                       Spliterator.CONCURRENT | Spliterator.NONNULL |

                                       Spliterator.DISTINCT | Spliterator.SORTED |

                                       Spliterator.ORDERED);

    }

    //

    void assertMapCharacteristics(Map<Integer, String> m, int keyCharacteristics) {

        assertMapCharacteristics(m, keyCharacteristics, 0);

    }

    void assertMapCharacteristics(Map<Integer, String> m, int keyCharacteristics, int notValueCharacteristics) {

        initMap(m);

        assertCharacteristics(m.keySet(), keyCharacteristics);

        assertCharacteristics(m.values(),

                              keyCharacteristics & ~(Spliterator.DISTINCT | notValueCharacteristics));

        assertCharacteristics(m.entrySet(), keyCharacteristics);

        if ((keyCharacteristics & Spliterator.SORTED) == 0) {

            assertISEComparator(m.keySet());

            assertISEComparator(m.values());

            assertISEComparator(m.entrySet());

        }

    }

    void assertSetCharacteristics(Set<Integer> s, int keyCharacteristics) {

        initSet(s);

        assertCharacteristics(s, keyCharacteristics);

        if ((keyCharacteristics & Spliterator.SORTED) == 0) {

            assertISEComparator(s);

        }

    }

    void assertSortedMapCharacteristics(SortedMap<Integer, String> m, int keyCharacteristics) {

        assertMapCharacteristics(m, keyCharacteristics, Spliterator.SORTED);

        Set<Integer> keys = m.keySet();

        if (m.comparator() != null) {

            assertNotNullComparator(keys);

        }

        else {

            assertNullComparator(keys);

        }

        assertISEComparator(m.values());

        assertNotNullComparator(m.entrySet());

    }

    void assertSortedSetCharacteristics(SortedSet<Integer> s, int keyCharacteristics) {

        assertSetCharacteristics(s, keyCharacteristics);

        if (s.comparator() != null) {

            assertNotNullComparator(s);

        }

        else {

            assertNullComparator(s);

        }

    }

    void initMap(Map<Integer, String> m) {

        m.put(1, "4");

        m.put(2, "3");

        m.put(3, "2");

        m.put(4, "1");

    }

    void initSet(Set<Integer> s) {

        s.addAll(Arrays.asList(1, 2, 3, 4));

    }

    void assertCharacteristics(Collection<?> c, int expectedCharacteristics) {

        assertCharacteristics(c.spliterator(), expectedCharacteristics);

    }

    void assertCharacteristics(Spliterator<?> s, int expectedCharacteristics) {

        assertTrue(s.hasCharacteristics(expectedCharacteristics),

                   "Spliterator characteristics");

    }

    void assertHasNotCharacteristics(Spliterator<?> s, int expectedCharacteristics) {

        assertFalse(s.hasCharacteristics(expectedCharacteristics),

                    "Spliterator characteristics");

    }

    void assertNullComparator(Collection<?> c) {

        assertNull(c.spliterator().getComparator(),

                   "Comparator of Spliterator of Collection");

    }

    void assertNotNullComparator(Collection<?> c) {

        assertNotNull(c.spliterator().getComparator(),

                      "Comparator of Spliterator of Collection");

    }

    void assertISEComparator(Collection<?> c) {

        assertISEComparator(c.spliterator());

    }

    void assertISEComparator(Spliterator<?> s) {

        boolean caught = false;

        try {

            s.getComparator();

        }

        catch (IllegalStateException e) {

            caught = true;

        }

        assertTrue(caught, "Throwing IllegalStateException");

    }

}