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Java example source code file (EnumHashBiMapTest.java)

This example Java source code file (EnumHashBiMapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

country, entry, enumbimap, enumhashbimap, franc, gwtincompatible, illegalargumentexception, object, override, pound, sampleelements, string, suppresswarnings, util, yen

The EnumHashBiMapTest.java Java example source code

/*
 * 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.annotations.GwtIncompatible;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.collect.testing.google.BiMapTestSuiteBuilder;
import com.google.common.collect.testing.google.TestBiMapGenerator;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/**
 * Tests for {@code EnumHashBiMap}.
 *
 * @author Mike Bostock
 */
@GwtCompatible(emulated = true)
public class EnumHashBiMapTest extends TestCase {
  private enum Currency { DOLLAR, FRANC, PESO, POUND, YEN }
  private enum Country { CANADA, CHILE, JAPAN, SWITZERLAND, UK }

  public static final class EnumHashBiMapGenerator implements TestBiMapGenerator<Country, String> {
    @SuppressWarnings("unchecked")
    @Override
    public BiMap<Country, String> create(Object... entries) {
      BiMap<Country, String> result = EnumHashBiMap.create(Country.class);
      for (Object o : entries) {
        Entry<Country, String> entry = (Entry) o;
        result.put(entry.getKey(), entry.getValue());
      }
      return result;
    }

    @Override
    public SampleElements<Entry samples() {
      return new SampleElements<Entry(
          Maps.immutableEntry(Country.CANADA, "DOLLAR"),
          Maps.immutableEntry(Country.CHILE, "PESO"),
          Maps.immutableEntry(Country.UK, "POUND"),
          Maps.immutableEntry(Country.JAPAN, "YEN"),
          Maps.immutableEntry(Country.SWITZERLAND, "FRANC"));
    }

    @SuppressWarnings("unchecked")
    @Override
    public Entry<Country, String>[] createArray(int length) {
      return new Entry[length];
    }

    @Override
    public Iterable<Entry order(List> insertionOrder) {
      return insertionOrder;
    }

    @Override
    public Country[] createKeyArray(int length) {
      return new Country[length];
    }

    @Override
    public String[] createValueArray(int length) {
      return new String[length];
    }
  }

  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(BiMapTestSuiteBuilder.using(new EnumHashBiMapGenerator())
        .named("EnumHashBiMap")
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.SERIALIZABLE,
            CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.GENERAL_PURPOSE,
            CollectionFeature.KNOWN_ORDER)
        .createTestSuite());
    suite.addTestSuite(EnumHashBiMapTest.class);
    return suite;
  }

  public void testCreate() {
    EnumHashBiMap<Currency, String> bimap =
        EnumHashBiMap.create(Currency.class);
    assertTrue(bimap.isEmpty());
    assertEquals("{}", bimap.toString());
    assertEquals(HashBiMap.create(), bimap);
    bimap.put(Currency.DOLLAR, "dollar");
    assertEquals("dollar", bimap.get(Currency.DOLLAR));
    assertEquals(Currency.DOLLAR, bimap.inverse().get("dollar"));
  }

  public void testCreateFromMap() {
    /* Test with non-empty Map. */
    Map<Currency, String> map = ImmutableMap.of(
        Currency.DOLLAR, "dollar",
        Currency.PESO, "peso",
        Currency.FRANC, "franc");
    EnumHashBiMap<Currency, String> bimap
        = EnumHashBiMap.create(map);
    assertEquals("dollar", bimap.get(Currency.DOLLAR));
    assertEquals(Currency.DOLLAR, bimap.inverse().get("dollar"));

    /* Map must have at least one entry if not an EnumHashBiMap. */
    try {
      EnumHashBiMap.create(
          Collections.<Currency, String>emptyMap());
      fail("IllegalArgumentException expected");
    } catch (IllegalArgumentException expected) {}

    /* Map can be empty if it's an EnumHashBiMap. */
    Map<Currency, String> emptyBimap = EnumHashBiMap.create(Currency.class);
    bimap = EnumHashBiMap.create(emptyBimap);
    assertTrue(bimap.isEmpty());

    /* Map can be empty if it's an EnumBiMap. */
    Map<Currency, Country> emptyBimap2 =
        EnumBiMap.create(Currency.class, Country.class);
    EnumHashBiMap<Currency, Country> bimap2
        = EnumHashBiMap.create(emptyBimap2);
    assertTrue(bimap2.isEmpty());
  }

  public void testEnumHashBiMapConstructor() {
    /* Test that it copies existing entries. */
    EnumHashBiMap<Currency, String> bimap1 =
        EnumHashBiMap.create(Currency.class);
    bimap1.put(Currency.DOLLAR, "dollar");
    EnumHashBiMap<Currency, String> bimap2 =
        EnumHashBiMap.create(bimap1);
    assertEquals("dollar", bimap2.get(Currency.DOLLAR));
    assertEquals(bimap1, bimap2);
    bimap2.inverse().put("franc", Currency.FRANC);
    assertEquals("franc", bimap2.get(Currency.FRANC));
    assertNull(bimap1.get(Currency.FRANC));
    assertFalse(bimap2.equals(bimap1));

    /* Test that it can be empty. */
    EnumHashBiMap<Currency, String> emptyBimap =
        EnumHashBiMap.create(Currency.class);
    EnumHashBiMap<Currency, String> bimap3 =
        EnumHashBiMap.create(emptyBimap);
    assertEquals(bimap3, emptyBimap);
  }

  public void testEnumBiMapConstructor() {
    /* Test that it copies existing entries. */
    EnumBiMap<Currency, Country> bimap1 =
        EnumBiMap.create(Currency.class, Country.class);
    bimap1.put(Currency.DOLLAR, Country.SWITZERLAND);
    EnumHashBiMap<Currency, Object> bimap2 = // use supertype
        EnumHashBiMap.<Currency, Object>create(bimap1);
    assertEquals(Country.SWITZERLAND, bimap2.get(Currency.DOLLAR));
    assertEquals(bimap1, bimap2);
    bimap2.inverse().put("franc", Currency.FRANC);
    assertEquals("franc", bimap2.get(Currency.FRANC));
    assertNull(bimap1.get(Currency.FRANC));
    assertFalse(bimap2.equals(bimap1));

    /* Test that it can be empty. */
    EnumBiMap<Currency, Country> emptyBimap =
        EnumBiMap.create(Currency.class, Country.class);
    EnumHashBiMap<Currency, Country> bimap3 = // use exact type
        EnumHashBiMap.create(emptyBimap);
    assertEquals(bimap3, emptyBimap);
  }

  public void testKeyType() {
    EnumHashBiMap<Currency, String> bimap =
        EnumHashBiMap.create(Currency.class);
    assertEquals(Currency.class, bimap.keyType());
  }

  public void testEntrySet() {
    // Bug 3168290
    Map<Currency, String> map = ImmutableMap.of(
        Currency.DOLLAR, "dollar",
        Currency.PESO, "peso",
        Currency.FRANC, "franc");
    EnumHashBiMap<Currency, String> bimap
        = EnumHashBiMap.create(map);

    Set<Object> uniqueEntries = Sets.newIdentityHashSet();
    uniqueEntries.addAll(bimap.entrySet());
    assertEquals(3, uniqueEntries.size());
  }

  @GwtIncompatible // serialize
  public void testSerializable() {
    SerializableTester.reserializeAndAssert(EnumHashBiMap.create(Currency.class));
  }

  @GwtIncompatible // reflection
  public void testNulls() {
    new NullPointerTester().testAllPublicStaticMethods(EnumHashBiMap.class);
    new NullPointerTester().testAllPublicInstanceMethods(EnumHashBiMap.create(Currency.class));
  }
}

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