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Java example source code file (AbstractMultimapAsMapImplementsMapTest.java)

This example Java source code file (AbstractMultimapAsMapImplementsMapTest.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

abstractmultimapasmapimplementsmaptest, collection, expected, gwtcompatible, integer, mapinterfacetest, override, string, unsupportedoperationexception, util

The AbstractMultimapAsMapImplementsMapTest.java Java example source code

/*
 * Copyright (C) 2008 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.MapInterfaceTest;

import java.util.Collection;
import java.util.Map;

/**
 * Test {@link Multimap#asMap()} for an arbitrary multimap with
 * {@link MapInterfaceTest}.
 *
 * @author George van den Driessche
 * @author Jared Levy
 */
@GwtCompatible
public abstract class AbstractMultimapAsMapImplementsMapTest
    extends MapInterfaceTest<String, Collection {

  public AbstractMultimapAsMapImplementsMapTest(
      boolean modifiable, boolean allowsNulls, boolean supportsIteratorRemove) {
    super(allowsNulls, allowsNulls, false, modifiable, modifiable, supportsIteratorRemove);
  }

  protected void populate(Multimap<String, Integer> multimap) {
    multimap.put("one", 1);
    multimap.put("two", 2);
    multimap.put("two", 22);
    multimap.put("three", 3);
    multimap.put("three", 33);
    multimap.put("three", 333);
  }

  @Override protected String getKeyNotInPopulatedMap()
      throws UnsupportedOperationException {
    return "zero";
  }

  @Override protected Collection<Integer> getValueNotInPopulatedMap()
      throws UnsupportedOperationException {
    return Lists.newArrayList(0);
  }

  /**
   * The version of this test supplied by {@link MapInterfaceTest} fails for
   * this particular Map implementation, because {@code map.get()} returns a
   * view collection that changes in the course of a call to {@code remove()}.
   * Thus, the expectation doesn't hold that {@code map.remove(x)} returns the
   * same value which {@code map.get(x)} did immediately beforehand.
   */
  @Override public void testRemove() {
    final Map<String, Collection map;
    final String keyToRemove;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }
    keyToRemove = map.keySet().iterator().next();
    if (supportsRemove) {
      int initialSize = map.size();
      map.get(keyToRemove);
      map.remove(keyToRemove);
      // This line doesn't hold - see the Javadoc comments above.
      // assertEquals(expectedValue, oldValue);
      assertFalse(map.containsKey(keyToRemove));
      assertEquals(initialSize - 1, map.size());
    } else {
      try {
        map.remove(keyToRemove);
        fail("Expected UnsupportedOperationException.");
      } catch (UnsupportedOperationException e) {
        // Expected.
      }
    }
    assertInvariants(map);
  }
}

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