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Java example source code file (MultimapAsMapTester.java)

This example Java source code file (MultimapAsMapTester.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, entry, gwtcompatible, iterator, list, multimap, multimapasmaptester, nullpointerexception, set, supports_remove, util, zero

The MultimapAsMapTester.java Java example source code

/*
 * Copyright (C) 2013 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.testing.google;

import static com.google.common.collect.testing.Helpers.assertContentsAnyOrder;
import static com.google.common.collect.testing.Helpers.assertContentsInOrder;
import static com.google.common.collect.testing.Helpers.assertEqualIgnoringOrder;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT;
import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimap;
import com.google.common.collect.testing.Helpers;
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 java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;

/**
 * Tests for {@link Multimap#asMap}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
public class MultimapAsMapTester<K, V> extends AbstractMultimapTester> {
  public void testAsMapGet() {
    for (K key : sampleKeys()) {
      List<V> expectedValues = new ArrayList();
      for (Entry<K, V> entry : getSampleElements()) {
        if (entry.getKey().equals(key)) {
          expectedValues.add(entry.getValue());
        }
      }

      Collection<V> collection = multimap().asMap().get(key);
      if (expectedValues.isEmpty()) {
        assertNull(collection);
      } else {
        assertEqualIgnoringOrder(expectedValues, collection);
      }
    }
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(ALLOWS_NULL_KEYS)
  public void testAsMapGetNullKeyPresent() {
    initMultimapWithNullKey();
    assertContentsAnyOrder(multimap().asMap().get(null), getValueForNullKey());
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
  public void testAsMapGetNullKeyAbsent() {
    assertNull(multimap().asMap().get(null));
  }

  @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
  public void testAsMapGetNullKeyUnsupported() {
    try {
      multimap().asMap().get(null);
      fail("Expected NullPointerException");
    } catch (NullPointerException expected) {
    }
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testAsMapRemove() {
    assertContentsInOrder(multimap().asMap().remove(k0()), v0());
    assertGet(k0());
    assertEquals(getNumElements() - 1, multimap().size());
  }

  @CollectionSize.Require(SEVERAL)
  @MapFeature.Require(SUPPORTS_PUT)
  public void testAsMapEntrySetReflectsPutSameKey() {
    resetContainer(Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v3()));

    Set<Entry> asMapEntrySet = multimap().asMap().entrySet();
    Collection<V> valueCollection = Iterables.getOnlyElement(asMapEntrySet).getValue();
    assertContentsAnyOrder(valueCollection, v0(), v3());
    assertTrue(multimap().put(k0(), v4()));
    assertContentsAnyOrder(valueCollection, v0(), v3(), v4());
  }

  @CollectionSize.Require(SEVERAL)
  @MapFeature.Require(SUPPORTS_PUT)
  public void testAsMapEntrySetReflectsPutDifferentKey() {
    resetContainer(Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v3()));

    Set<Entry> asMapEntrySet = multimap().asMap().entrySet();
    assertTrue(multimap().put(k1(), v4()));
    assertEquals(2, asMapEntrySet.size());
  }

  @CollectionSize.Require(SEVERAL)
  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})
  public void testAsMapEntrySetRemovePropagatesToMultimap() {
    resetContainer(Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v3()));
    Set<Entry> asMapEntrySet = multimap().asMap().entrySet();
    Entry<K, Collection asMapEntry0 = Iterables.getOnlyElement(asMapEntrySet);
    assertTrue(multimap().put(k1(), v4()));
    assertTrue(asMapEntrySet.remove(asMapEntry0));
    assertEquals(1, multimap().size());
    assertContentsInOrder(multimap().keySet(), k1());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testAsMapEntrySetIteratorRemovePropagatesToMultimap() {
    resetContainer(Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v3()));
    Set<Entry> asMapEntrySet = multimap().asMap().entrySet();
    Iterator<Entry> asMapEntryItr = asMapEntrySet.iterator();
    asMapEntryItr.next();
    asMapEntryItr.remove();
    assertTrue(multimap().isEmpty());
  }
}

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