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Java example source code file (LinkedHashMultimapTest.java)

This example Java source code file (LinkedHashMultimapTest.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

collection, gwtincompatible, illegalargumentexception, integer, iteratortester, linkedhashmultimap, modifiable, multimap, override, seriazabletester, set, string, suppresswarnings, testsuite, util

The LinkedHashMultimapTest.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.Lists.newArrayList;
import static com.google.common.collect.Sets.newHashSet;
import static com.google.common.collect.Sets.newLinkedHashSet;
import static com.google.common.collect.testing.Helpers.mapEntry;
import static com.google.common.collect.testing.IteratorFeature.MODIFIABLE;
import static com.google.common.truth.Truth.assertThat;
import static java.util.Arrays.asList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.IteratorTester;
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.SetMultimapTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringSetMultimapGenerator;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.SerializableTester;

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

import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/**
 * Unit tests for {@code LinkedHashMultimap}.
 *
 * @author Jared Levy
 */
@GwtCompatible(emulated = true)
public class LinkedHashMultimapTest extends TestCase {

  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(SetMultimapTestSuiteBuilder.using(new TestStringSetMultimapGenerator() {
        @Override
        protected SetMultimap<String, String> create(Entry[] entries) {
          SetMultimap<String, String> multimap = LinkedHashMultimap.create();
          for (Entry<String, String> entry : entries) {
            multimap.put(entry.getKey(), entry.getValue());
          }
          return multimap;
        }
      })
      .named("LinkedHashMultimap")
      .withFeatures(
          MapFeature.ALLOWS_NULL_KEYS,
          MapFeature.ALLOWS_NULL_VALUES,
          MapFeature.ALLOWS_ANY_NULL_QUERIES,
          MapFeature.GENERAL_PURPOSE,
          MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION,
          CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
          CollectionFeature.KNOWN_ORDER,
          CollectionFeature.SERIALIZABLE,
          CollectionSize.ANY)
      .createTestSuite());
    suite.addTestSuite(LinkedHashMultimapTest.class);
    return suite;
  }

  public void testValueSetHashTableExpansion() {
    LinkedHashMultimap<String, Integer> multimap = LinkedHashMultimap.create();
    for (int z = 1; z <= 100; z++) {
      multimap.put("a", z);
      // The Eclipse compiler (and hence GWT) rejects a parameterized cast.
      @SuppressWarnings("unchecked")
      LinkedHashMultimap<String, Integer>.ValueSet valueSet =
          (LinkedHashMultimap.ValueSet) multimap.backingMap().get("a");
      assertEquals(z, valueSet.size());
      assertFalse(Hashing.needsResizing(valueSet.size(), valueSet.hashTable.length,
          LinkedHashMultimap.VALUE_SET_LOAD_FACTOR));
    }
  }

  private Multimap<String, Integer> initializeMultimap5() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("foo", 5);
    multimap.put("bar", 4);
    multimap.put("foo", 3);
    multimap.put("cow", 2);
    multimap.put("bar", 1);
    return multimap;
  }

  public void testToString() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("foo", 3);
    multimap.put("bar", 1);
    multimap.putAll("foo", Arrays.asList(-1, 2, 4));
    multimap.putAll("bar", Arrays.asList(2, 3));
    multimap.put("foo", 1);
    assertEquals("{foo=[3, -1, 2, 4, 1], bar=[1, 2, 3]}",
        multimap.toString());
  }

  public void testOrderingReadOnly() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    assertOrderingReadOnly(multimap);
  }

  public void testOrderingUnmodifiable() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    assertOrderingReadOnly(Multimaps.unmodifiableMultimap(multimap));
  }

  public void testOrderingSynchronized() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    assertOrderingReadOnly(Multimaps.synchronizedMultimap(multimap));
  }

  @GwtIncompatible // SeriazableTester
  public void testSerializationOrdering() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    Multimap<String, Integer> copy
        = SerializableTester.reserializeAndAssert(multimap);
    assertOrderingReadOnly(copy);
  }

  @GwtIncompatible // SeriazableTester
  public void testSerializationOrderingKeysAndEntries() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("a", 1);
    multimap.put("b", 2);
    multimap.put("a", 3);
    multimap.put("c", 4);
    multimap.remove("a", 1);
    multimap = SerializableTester.reserializeAndAssert(multimap);
    assertThat(multimap.keySet()).containsExactly("a", "b", "c").inOrder();
    assertThat(multimap.entries()).containsExactly(
        mapEntry("b", 2),
        mapEntry("a", 3),
        mapEntry("c", 4)).inOrder();
    // note that the keys and entries are in different orders
  }

  private void assertOrderingReadOnly(Multimap<String, Integer> multimap) {
    assertThat(multimap.get("foo")).containsExactly(5, 3).inOrder();
    assertThat(multimap.get("bar")).containsExactly(4, 1).inOrder();
    assertThat(multimap.get("cow")).contains(2);

    assertThat(multimap.keySet()).containsExactly("foo", "bar", "cow").inOrder();
    assertThat(multimap.values()).containsExactly(5, 4, 3, 2, 1).inOrder();

    Iterator<Map.Entry entryIterator =
        multimap.entries().iterator();
    assertEquals(Maps.immutableEntry("foo", 5), entryIterator.next());
    assertEquals(Maps.immutableEntry("bar", 4), entryIterator.next());
    assertEquals(Maps.immutableEntry("foo", 3), entryIterator.next());
    assertEquals(Maps.immutableEntry("cow", 2), entryIterator.next());
    assertEquals(Maps.immutableEntry("bar", 1), entryIterator.next());

    Iterator<Map.Entry> collectionIterator =
        multimap.asMap().entrySet().iterator();
    Map.Entry<String, Collection entry = collectionIterator.next();
    assertEquals("foo", entry.getKey());
    assertThat(entry.getValue()).containsExactly(5, 3).inOrder();
    entry = collectionIterator.next();
    assertEquals("bar", entry.getKey());
    assertThat(entry.getValue()).containsExactly(4, 1).inOrder();
    entry = collectionIterator.next();
    assertEquals("cow", entry.getKey());
    assertThat(entry.getValue()).contains(2);
  }

  public void testOrderingUpdates() {
    Multimap<String, Integer> multimap = initializeMultimap5();

    assertThat(multimap.replaceValues("foo", asList(6, 7))).containsExactly(5, 3).inOrder();
    assertThat(multimap.keySet()).containsExactly("foo", "bar", "cow").inOrder();
    assertThat(multimap.removeAll("foo")).containsExactly(6, 7).inOrder();
    assertThat(multimap.keySet()).containsExactly("bar", "cow").inOrder();
    assertTrue(multimap.remove("bar", 4));
    assertThat(multimap.keySet()).containsExactly("bar", "cow").inOrder();
    assertTrue(multimap.remove("bar", 1));
    assertThat(multimap.keySet()).contains("cow");
    multimap.put("bar", 9);
    assertThat(multimap.keySet()).containsExactly("cow", "bar").inOrder();
  }

  public void testToStringNullExact() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();

    multimap.put("foo", 3);
    multimap.put("foo", -1);
    multimap.put(null, null);
    multimap.put("bar", 1);
    multimap.put("foo", 2);
    multimap.put(null, 0);
    multimap.put("bar", 2);
    multimap.put("bar", null);
    multimap.put("foo", null);
    multimap.put("foo", 4);
    multimap.put(null, -1);
    multimap.put("bar", 3);
    multimap.put("bar", 1);
    multimap.put("foo", 1);

    assertEquals(
        "{foo=[3, -1, 2, null, 4, 1], null=[null, 0, -1], bar=[1, 2, null, 3]}",
        multimap.toString());
  }

  public void testPutMultimapOrdered() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.putAll(initializeMultimap5());
    assertOrderingReadOnly(multimap);
  }

  public void testKeysToString_ordering() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    assertEquals("[foo x 2, bar x 2, cow]", multimap.keys().toString());
  }

  public void testCreate() {
    LinkedHashMultimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("foo", 1);
    multimap.put("bar", 2);
    multimap.put("foo", 3);
    assertEquals(ImmutableSet.of(1, 3), multimap.get("foo"));
  }

  public void testCreateFromMultimap() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("a", 1);
    multimap.put("b", 2);
    multimap.put("a", 3);
    multimap.put("c", 4);
    LinkedHashMultimap<String, Integer> copy =
        LinkedHashMultimap.create(multimap);
    new EqualsTester()
        .addEqualityGroup(multimap, copy)
        .testEquals();
  }

  public void testCreateFromSizes() {
    LinkedHashMultimap<String, Integer> multimap
        = LinkedHashMultimap.create(20, 15);
    multimap.put("foo", 1);
    multimap.put("bar", 2);
    multimap.put("foo", 3);
    assertEquals(ImmutableSet.of(1, 3), multimap.get("foo"));
  }

  public void testCreateFromIllegalSizes() {
    try {
      LinkedHashMultimap.create(-20, 15);
      fail();
    } catch (IllegalArgumentException expected) {}

    try {
      LinkedHashMultimap.create(20, -15);
      fail();
    } catch (IllegalArgumentException expected) {}
  }

  @GwtIncompatible // unreasonably slow
  public void testGetIteration() {
    new IteratorTester<Integer>(6, MODIFIABLE,
        newLinkedHashSet(asList(2, 3, 4, 7, 8)),
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<Integer> newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3, 4));
        multimap.putAll("bar", asList(5, 6));
        multimap.putAll("foo", asList(7, 8));
        return multimap.get("foo").iterator();
      }

      @Override protected void verify(List<Integer> elements) {
        assertEquals(newHashSet(elements), multimap.get("foo"));
      }
    }.test();
  }

  @GwtIncompatible // unreasonably slow
  public void testEntriesIteration() {
    @SuppressWarnings("unchecked")
    Set<Entry set = Sets.newLinkedHashSet(asList(
        Maps.immutableEntry("foo", 2),
        Maps.immutableEntry("foo", 3),
        Maps.immutableEntry("bar", 4),
        Maps.immutableEntry("bar", 5),
        Maps.immutableEntry("foo", 6)));

    new IteratorTester<Entry(6, MODIFIABLE, set,
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<Entry newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        return multimap.entries().iterator();
      }

      @Override protected void verify(List<Entry elements) {
        assertEquals(newHashSet(elements), multimap.entries());
      }
    }.test();
  }

  @GwtIncompatible // unreasonably slow
  public void testKeysIteration() {
    new IteratorTester<String>(6, MODIFIABLE, newArrayList("foo", "foo", "bar",
        "bar", "foo"), IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<String> newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        return multimap.keys().iterator();
      }

      @Override protected void verify(List<String> elements) {
        assertEquals(elements, Lists.newArrayList(multimap.keys()));
      }
    }.test();
  }

  @GwtIncompatible // unreasonably slow
  public void testValuesIteration() {
    new IteratorTester<Integer>(6, MODIFIABLE, newArrayList(2, 3, 4, 5, 6),
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<Integer> newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        return multimap.values().iterator();
      }

      @Override protected void verify(List<Integer> elements) {
        assertEquals(elements, Lists.newArrayList(multimap.values()));
      }
    }.test();
  }

  @GwtIncompatible // unreasonably slow
  public void testKeySetIteration() {
    new IteratorTester<String>(6, MODIFIABLE,
        newLinkedHashSet(asList("foo", "bar", "baz", "dog", "cat")),
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<String> newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        multimap.putAll("baz", asList(7, 8));
        multimap.putAll("dog", asList(9));
        multimap.putAll("bar", asList(10, 11));
        multimap.putAll("cat", asList(12, 13, 14));
        return multimap.keySet().iterator();
      }

      @Override protected void verify(List<String> elements) {
        assertEquals(newHashSet(elements), multimap.keySet());
      }
    }.test();
  }

  @GwtIncompatible // unreasonably slow
  public void testAsSetIteration() {
    @SuppressWarnings("unchecked")
    Set<Entry> set = newLinkedHashSet(asList(
        Maps.immutableEntry("foo",
            (Collection<Integer>) Sets.newHashSet(2, 3, 6)),
        Maps.immutableEntry("bar",
            (Collection<Integer>) Sets.newHashSet(4, 5, 10, 11)),
        Maps.immutableEntry("baz",
            (Collection<Integer>) Sets.newHashSet(7, 8)),
        Maps.immutableEntry("dog",
            (Collection<Integer>) Sets.newHashSet(9)),
        Maps.immutableEntry("cat",
            (Collection<Integer>) Sets.newHashSet(12, 13, 14))
    ));
    new IteratorTester<Entry>(6, MODIFIABLE, set,
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      private Multimap<String, Integer> multimap;

      @Override protected Iterator<Entry>
          newTargetIterator() {
        multimap = LinkedHashMultimap.create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        multimap.putAll("baz", asList(7, 8));
        multimap.putAll("dog", asList(9));
        multimap.putAll("bar", asList(10, 11));
        multimap.putAll("cat", asList(12, 13, 14));
        return multimap.asMap().entrySet().iterator();
      }

      @Override protected void verify(
          List<Entry> elements) {
        assertEquals(newHashSet(elements), multimap.asMap().entrySet());
      }
    }.test();
  }
}

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