UnmodifiableNavigableSetTest.java

/*
 * 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
 *
 *      https://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.apache.commons.collections4.set;

import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertThrows;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.NavigableSet;
import java.util.Set;
import java.util.TreeSet;

import org.junit.jupiter.api.Test;

/**
 * Extension of {@link AbstractNavigableSetTest} for exercising the
 * {@link UnmodifiableNavigableSet} implementation.
 */
public class UnmodifiableNavigableSetTest<E> extends AbstractNavigableSetTest<E> {
    protected UnmodifiableNavigableSet<E> set;
    protected ArrayList<E> array;

    @Override
    public String getCompatibilityVersion() {
        return "4.1";
    }

    @Override
    public boolean isAddSupported() {
        return false;
    }

    @Override
    public boolean isRemoveSupported() {
        return false;
    }

    @Override
    public UnmodifiableNavigableSet<E> makeFullCollection() {
        final TreeSet<E> set = new TreeSet<>(Arrays.asList(getFullElements()));
        return (UnmodifiableNavigableSet<E>) UnmodifiableNavigableSet.unmodifiableNavigableSet(set);
    }

    @Override
    public NavigableSet<E> makeObject() {
        return UnmodifiableNavigableSet.unmodifiableNavigableSet(new TreeSet<>());
    }

    @SuppressWarnings("unchecked")
    protected void setupSet() {
        set = makeFullCollection();
        array = new ArrayList<>();
        array.add((E) Integer.valueOf(1));
    }

    @Test
    void testComparator() {
        setupSet();
        final Comparator<? super E> c = set.comparator();
        assertNull(c, "natural order, so comparator should be null");
    }

    @Test
    void testDecorateFactory() {
        final NavigableSet<E> set = makeFullCollection();
        assertSame(set, UnmodifiableNavigableSet.unmodifiableNavigableSet(set));
        assertThrows(NullPointerException.class, () -> UnmodifiableNavigableSet.unmodifiableNavigableSet(null));
    }

    /**
     * Verify that base set and subsets are not modifiable
     */
    @Test
    @SuppressWarnings("unchecked")
    void testUnmodifiable() {
        setupSet();
        verifyUnmodifiable(set);
        verifyUnmodifiable(set.descendingSet());
        verifyUnmodifiable(set.headSet((E) Integer.valueOf(1)));
        verifyUnmodifiable(set.headSet((E) Integer.valueOf(1), true));
        verifyUnmodifiable(set.tailSet((E) Integer.valueOf(1)));
        verifyUnmodifiable(set.tailSet((E) Integer.valueOf(1), false));
        verifyUnmodifiable(set.subSet((E) Integer.valueOf(1), (E) Integer.valueOf(3)));
        verifyUnmodifiable(set.subSet((E) Integer.valueOf(1), false, (E) Integer.valueOf(3), false));
        verifyUnmodifiable(set.subSet((E) Integer.valueOf(1), true, (E) Integer.valueOf(3), true));
    }

    /**
     * Verifies that a set is not modifiable
     */
    @SuppressWarnings("unchecked")
    public void verifyUnmodifiable(final Set<E> set) {
        assertThrows(UnsupportedOperationException.class, () -> set.add((E) "value"));
        assertThrows(UnsupportedOperationException.class, () -> set.addAll(new TreeSet<>()));
        assertThrows(UnsupportedOperationException.class, () -> set.clear());
        assertThrows(UnsupportedOperationException.class, () -> set.iterator().remove());
        assertThrows(UnsupportedOperationException.class, () -> set.remove("x"));
        assertThrows(UnsupportedOperationException.class, () -> set.removeAll(array));
        assertThrows(UnsupportedOperationException.class, () -> set.removeIf(element -> true));
        assertThrows(UnsupportedOperationException.class, () -> set.retainAll(array));

        if (set instanceof NavigableSet) {
            final NavigableSet<E> navigableSet = (NavigableSet<E>) set;
            assertThrows(UnsupportedOperationException.class, () -> navigableSet.pollFirst());
            assertThrows(UnsupportedOperationException.class, () -> navigableSet.pollLast());
        }
    }

//    void testCreate() throws Exception {
//        resetEmpty();
//        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/UnmodifiableNavigableSet.emptyCollection.version4.1.obj");
//        resetFull();
//        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/UnmodifiableNavigableSet.fullCollection.version4.1.obj");
//    }

}