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Java example source code file (EnumBiMapTest.java)

This example Java source code file (EnumBiMapTest.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, currency, dollar, entry, enumbimap, enumbimapgenerator, enumbimaptest, gwtincompatible, illegalargumentexception, iterator, override, sampleelements, suppresswarnings, testsuite, util

The EnumBiMapTest.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 static com.google.common.collect.testing.Helpers.orderEntriesByKey;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.Helpers;
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.EqualsTester;
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.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

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

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

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

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

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

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

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

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

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

  public void testCreateFromMap() {
    /* Test with non-empty Map. */
    Map<Currency, Country> map = ImmutableMap.of(
        Currency.DOLLAR, Country.CANADA,
        Currency.PESO, Country.CHILE,
        Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);
    assertEquals(Country.CANADA, bimap.get(Currency.DOLLAR));
    assertEquals(Currency.DOLLAR, bimap.inverse().get(Country.CANADA));

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

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

  public void testEnumBiMapConstructor() {
    /* Test that it copies existing entries. */
    EnumBiMap<Currency, Country> bimap1 =
        EnumBiMap.create(Currency.class, Country.class);
    bimap1.put(Currency.DOLLAR, Country.CANADA);
    EnumBiMap<Currency, Country> bimap2 =
        EnumBiMap.create(bimap1);
    assertEquals(Country.CANADA, bimap2.get(Currency.DOLLAR));
    assertEquals(bimap1, bimap2);
    bimap2.inverse().put(Country.SWITZERLAND, Currency.FRANC);
    assertEquals(Country.SWITZERLAND, 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);
    EnumBiMap<Currency, Country> bimap3 =
        EnumBiMap.create(emptyBimap);
    assertEquals(bimap3, emptyBimap);
  }

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

  public void testValueType() {
    EnumBiMap<Currency, Country> bimap =
        EnumBiMap.create(Currency.class, Country.class);
    assertEquals(Country.class, bimap.valueType());
  }

  public void testIterationOrder() {
    // The enum orderings are alphabetical, leading to the bimap and its inverse
    // having inconsistent iteration orderings.
    Map<Currency, Country> map = ImmutableMap.of(
        Currency.DOLLAR, Country.CANADA,
        Currency.PESO, Country.CHILE,
        Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);

    // forward map ordered by currency
    assertThat(bimap.keySet())
        .containsExactly(Currency.DOLLAR, Currency.FRANC, Currency.PESO).inOrder();
    // forward map ordered by currency (even for country values)
    assertThat(bimap.values())
        .containsExactly(Country.CANADA, Country.SWITZERLAND, Country.CHILE).inOrder();
    // backward map ordered by country
    assertThat(bimap.inverse().keySet())
        .containsExactly(Country.CANADA, Country.CHILE, Country.SWITZERLAND).inOrder();
    // backward map ordered by country (even for currency values)
    assertThat(bimap.inverse().values())
        .containsExactly(Currency.DOLLAR, Currency.PESO, Currency.FRANC).inOrder();
  }

  public void testKeySetIteratorRemove() {
    // The enum orderings are alphabetical, leading to the bimap and its inverse
    // having inconsistent iteration orderings.
    Map<Currency, Country> map = ImmutableMap.of(
        Currency.DOLLAR, Country.CANADA,
        Currency.PESO, Country.CHILE,
        Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);

    Iterator<Currency> iter = bimap.keySet().iterator();
    assertEquals(Currency.DOLLAR, iter.next());
    iter.remove();

    // forward map ordered by currency
    assertThat(bimap.keySet())
        .containsExactly(Currency.FRANC, Currency.PESO).inOrder();
    // forward map ordered by currency (even for country values)
    assertThat(bimap.values())
        .containsExactly(Country.SWITZERLAND, Country.CHILE).inOrder();
    // backward map ordered by country
    assertThat(bimap.inverse().keySet())
        .containsExactly(Country.CHILE, Country.SWITZERLAND).inOrder();
    // backward map ordered by country (even for currency values)
    assertThat(bimap.inverse().values())
        .containsExactly(Currency.PESO, Currency.FRANC).inOrder();
  }

  public void testValuesIteratorRemove() {
    // The enum orderings are alphabetical, leading to the bimap and its inverse
    // having inconsistent iteration orderings.
    Map<Currency, Country> map = ImmutableMap.of(
        Currency.DOLLAR, Country.CANADA,
        Currency.PESO, Country.CHILE,
        Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);

    Iterator<Currency> iter = bimap.keySet().iterator();
    assertEquals(Currency.DOLLAR, iter.next());
    assertEquals(Currency.FRANC, iter.next());
    iter.remove();

    // forward map ordered by currency
    assertThat(bimap.keySet())
        .containsExactly(Currency.DOLLAR, Currency.PESO).inOrder();
    // forward map ordered by currency (even for country values)
    assertThat(bimap.values())
        .containsExactly(Country.CANADA, Country.CHILE).inOrder();
    // backward map ordered by country
    assertThat(bimap.inverse().keySet())
        .containsExactly(Country.CANADA, Country.CHILE).inOrder();
    // backward map ordered by country (even for currency values)
    assertThat(bimap.inverse().values())
        .containsExactly(Currency.DOLLAR, Currency.PESO).inOrder();
  }

  public void testEntrySet() {
    // Bug 3168290
    Map<Currency, Country> map = ImmutableMap.of(
        Currency.DOLLAR, Country.CANADA,
        Currency.PESO, Country.CHILE,
        Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);
    Set<Object> uniqueEntries = Sets.newIdentityHashSet();
    uniqueEntries.addAll(bimap.entrySet());
    assertEquals(3, uniqueEntries.size());
  }

  @GwtIncompatible // serialization
  public void testSerializable() {
    SerializableTester.reserializeAndAssert(
        EnumBiMap.create(ImmutableMap.of(Currency.DOLLAR, Country.CANADA)));
  }

  @GwtIncompatible // reflection
  public void testNulls() {
    new NullPointerTester().testAllPublicStaticMethods(EnumBiMap.class);
    new NullPointerTester()
        .testAllPublicInstanceMethods(
            EnumBiMap.create(ImmutableMap.of(Currency.DOLLAR, Country.CHILE)));
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(
            EnumBiMap.create(ImmutableMap.of(Currency.DOLLAR, Country.CANADA)),
            EnumBiMap.create(ImmutableMap.of(Currency.DOLLAR, Country.CANADA)))
        .addEqualityGroup(EnumBiMap.create(ImmutableMap.of(Currency.DOLLAR, Country.CHILE)))
        .addEqualityGroup(EnumBiMap.create(ImmutableMap.of(Currency.FRANC, Country.CANADA)))
        .testEquals();
  }

  /* Remaining behavior tested by AbstractBiMapTest. */
}

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