/*
    * 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 com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.google.TestStringBiMapGenerator;
  
  import junit.framework.TestCase;
  
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  
  /**
   * Tests for {@link HashBiMap}.
   *
   * @author Mike Bostock
   */
  @GwtCompatible(emulated = true)
  public class HashBiMapTest extends TestCase {
  
    public static final class HashBiMapGenerator extends TestStringBiMapGenerator {
      @Override
      protected BiMap<String, String> create(Entry<String, String>[] entries) {
        BiMap<String, String> result = HashBiMap.create();
        for (Entry<String, String> entry : entries) {
          result.put(entry.getKey(), entry.getValue());
        }
        return result;
      }
    }
  
    public void testMapConstructor() {
      /* Test with non-empty Map. */
      Map<String, String> map = ImmutableMap.of(
          "canada", "dollar",
          "chile", "peso",
          "switzerland", "franc");
      HashBiMap<String, String> bimap = HashBiMap.create(map);
      assertEquals("dollar", bimap.get("canada"));
      assertEquals("canada", bimap.inverse().get("dollar"));
    }
  
    private static final int N = 1000;
  
    public void testBashIt() throws Exception {
      BiMap<Integer, Integer> bimap = HashBiMap.create(N);
      BiMap<Integer, Integer> inverse = bimap.inverse();
  
      for (int i = 0; i < N; i++) {
        assertNull(bimap.put(2 * i, 2 * i + 1));
      }
      for (int i = 0; i < N; i++) {
        assertEquals(2 * i + 1, (int) bimap.get(2 * i));
      }
      for (int i = 0; i < N; i++) {
        assertEquals(2 * i, (int) inverse.get(2 * i + 1));
      }
      for (int i = 0; i < N; i++) {
        int oldValue = bimap.get(2 * i);
        assertEquals(2 * i + 1, (int) bimap.put(2 * i, oldValue - 2));
      }
      for (int i = 0; i < N; i++) {
        assertEquals(2 * i - 1, (int) bimap.get(2 * i));
      }
      for (int i = 0; i < N; i++) {
        assertEquals(2 * i, (int) inverse.get(2 * i - 1));
      }
      Set<Entry<Integer, Integer>> entries = bimap.entrySet();
      for (Entry<Integer, Integer> entry : entries) {
        entry.setValue(entry.getValue() + 2 * N);
      }
      for (int i = 0; i < N; i++) {
        assertEquals(2 * N + 2 * i - 1, (int) bimap.get(2 * i));
      }
    }
  
    public void testBiMapEntrySetIteratorRemove() {
      BiMap<Integer, String> map = HashBiMap.create();
      map.put(1, "one");
      Set<Map.Entry<Integer, String>> entries = map.entrySet();
      Iterator<Map.Entry<Integer, String>> iterator = entries.iterator();
      Map.Entry<Integer, String> entry = iterator.next();
      entry.setValue("two"); // changes the iterator's current entry value
     assertEquals("two", map.get(1));
     assertEquals(Integer.valueOf(1), map.inverse().get("two"));
     iterator.remove(); // removes the updated entry
     assertTrue(map.isEmpty());
   }
 }