/*
    * 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 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.Set;
  import java.util.SortedSet;
  import java.util.TreeSet;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Extension of {@link AbstractSortedSetTest} for exercising the
   * {@link UnmodifiableSortedSet} implementation.
   */
  public class UnmodifiableSortedSetTest<E> extends AbstractSortedSetTest<E> {
      protected UnmodifiableSortedSet<E> set;
      protected ArrayList<E> array;
  
      @Override
      public String getCompatibilityVersion() {
          return "4";
      }
  
      @Override
      public boolean isAddSupported() {
          return false;
      }
  
      @Override
      public boolean isRemoveSupported() {
          return false;
      }
  
      @Override
      public UnmodifiableSortedSet<E> makeFullCollection() {
          final TreeSet<E> set = new TreeSet<>(Arrays.asList(getFullElements()));
          return (UnmodifiableSortedSet<E>) UnmodifiableSortedSet.unmodifiableSortedSet(set);
      }
  
      @Override
      public SortedSet<E> makeObject() {
          return UnmodifiableSortedSet.unmodifiableSortedSet(new TreeSet<>());
      }
  
      @SuppressWarnings("unchecked")
      protected void setupSet() {
          set = makeFullCollection();
          array = new ArrayList<>();
          array.add((E) Integer.valueOf(1));
      }
  
      @Test
      public void testComparator() {
          setupSet();
          final Comparator<? super E> c = set.comparator();
          assertNull(c, "natural order, so comparator should be null");
      }
  
      @Test
      public void testDecorateFactory() {
          final SortedSet<E> set = makeFullCollection();
          assertSame(set, UnmodifiableSortedSet.unmodifiableSortedSet(set));
  
          assertThrows(NullPointerException.class, () -> UnmodifiableSortedSet.unmodifiableSortedSet(null));
      }
  
      /**
       * Verify that base set and subsets are not modifiable
       */
      @Test
      @SuppressWarnings("unchecked")
      public void testUnmodifiable() {
          setupSet();
          verifyUnmodifiable(set);
          verifyUnmodifiable(set.headSet((E) Integer.valueOf(1)));
          verifyUnmodifiable(set.tailSet((E) Integer.valueOf(1)));
          verifyUnmodifiable(set.subSet((E) Integer.valueOf(1), (E) Integer.valueOf(3)));
      }
 
     /**
      * 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.remove("x"));
         assertThrows(UnsupportedOperationException.class, () -> set.removeAll(array));
         assertThrows(UnsupportedOperationException.class, () -> set.retainAll(array));
     }
 
 //    public void testCreate() throws Exception {
 //        resetEmpty();
 //        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/UnmodifiableSortedSet.emptyCollection.version4.obj");
 //        resetFull();
 //        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/UnmodifiableSortedSet.fullCollection.version4.obj");
 //    }
 
 }