/*
    * Copyright (C) 2007 The Guava Authors
    *
    * 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 com.google.common.collect;
  
  import static java.util.Arrays.asList;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.AnEnum;
  import com.google.common.collect.testing.google.TestEnumMultisetGenerator;
  
  import junit.framework.TestCase;
  
  import java.util.Collection;
  import java.util.EnumSet;
  import java.util.Set;
  
  /**
   * Tests for an {@link EnumMultiset}.
   *
   * @author Jared Levy
   */
  @GwtCompatible(emulated = true)
  public class EnumMultisetTest extends TestCase {
  
    private static TestEnumMultisetGenerator enumMultisetGenerator() {
      return new TestEnumMultisetGenerator() {
        @Override protected Multiset<AnEnum> create(AnEnum[] elements) {
          return (elements.length == 0)
              ? EnumMultiset.create(AnEnum.class)
              : EnumMultiset.create(asList(elements));
        }
      };
    }
  
    private enum Color {
      BLUE, RED, YELLOW, GREEN, WHITE
    }
  
    private enum Gender {
      MALE, FEMALE
    }
  
    public void testClassCreate() {
      Multiset<Color> ms = EnumMultiset.create(Color.class);
      ms.add(Color.RED);
      ms.add(Color.YELLOW);
      ms.add(Color.RED);
      assertEquals(0, ms.count(Color.BLUE));
      assertEquals(1, ms.count(Color.YELLOW));
      assertEquals(2, ms.count(Color.RED));
    }
  
    public void testCollectionCreate() {
      Multiset<Color> ms = EnumMultiset.create(
          asList(Color.RED, Color.YELLOW, Color.RED));
      assertEquals(0, ms.count(Color.BLUE));
      assertEquals(1, ms.count(Color.YELLOW));
      assertEquals(2, ms.count(Color.RED));
    }
  
    public void testIllegalCreate() {
      Collection<Color> empty = EnumSet.noneOf(Color.class);
      try {
        EnumMultiset.create(empty);
        fail();
      } catch (IllegalArgumentException expected) {}
    }
    
    public void testCreateEmptyWithClass() {
      Multiset<Color> ms = EnumMultiset.create(ImmutableList.<Color>of(), Color.class);
      ms.add(Color.RED);
    }
    
    public void testCreateEmptyWithoutClassFails() {
      try {
        EnumMultiset.create(ImmutableList.<Color> of());
        fail("Expected IllegalArgumentException");
      } catch (IllegalArgumentException expected) {
      }
    }
  
    public void testToString() {
      Multiset<Color> ms = EnumMultiset.create(Color.class);
      ms.add(Color.BLUE, 3);
      ms.add(Color.YELLOW, 1);
     ms.add(Color.RED, 2);
     assertEquals("[BLUE x 3, RED x 2, YELLOW]", ms.toString());
   }
 
   public void testEntrySet() {
     Multiset<Color> ms = EnumMultiset.create(Color.class);
     ms.add(Color.BLUE, 3);
     ms.add(Color.YELLOW, 1);
     ms.add(Color.RED, 2);
 
     Set<Object> uniqueEntries = Sets.newIdentityHashSet();
     uniqueEntries.addAll(ms.entrySet());
     assertEquals(3, uniqueEntries.size());
   }
 
   // Wrapper of EnumMultiset factory methods, because we need to skip create(Class).
   // create(Enum1.class) is equal to create(Enum2.class) but testEquals() expects otherwise.
   // For the same reason, we need to skip create(Iterable, Class).
   private static class EnumMultisetFactory {
     public static <E extends Enum<E>> EnumMultiset<E> create(Iterable<E> elements) {
       return EnumMultiset.create(elements);
     }
   }
 }