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Java example source code file (MultisetEntrySetTester.java)

This example Java source code file (MultisetEntrySetTester.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

abstractmultisettester, gwtcompatible, iterator, multisetentrysettester, supports_add, supports_remove, util, zero

The MultisetEntrySetTester.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.testing.google;

import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.ONE;
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.google.MultisetFeature.ENTRIES_ARE_VIEWS;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multiset;
import com.google.common.collect.Multisets;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

import java.util.Collections;
import java.util.Iterator;

/**
 * Tests for {@code Multiset.entrySet}.
 *
 * @author Jared Levy
 */
@GwtCompatible
public class MultisetEntrySetTester<E> extends AbstractMultisetTester {

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_clear() {
    getMultiset().entrySet().clear();
    assertTrue("multiset not empty after entrySet().clear()", getMultiset().isEmpty());
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testEntrySet_iteratorRemovePropagates() {
    Iterator<Multiset.Entry iterator = getMultiset().entrySet().iterator();
    assertTrue(
        "non-empty multiset.entrySet() iterator.hasNext() returned false", iterator.hasNext());
    assertEquals(
        "multiset.entrySet() iterator.next() returned incorrect entry",
        Multisets.immutableEntry(e0(), 1),
        iterator.next());
    assertFalse(
        "size 1 multiset.entrySet() iterator.hasNext() returned true after next()",
        iterator.hasNext());
    iterator.remove();
    assertTrue(
        "multiset isn't empty after multiset.entrySet() iterator.remove()",
        getMultiset().isEmpty());
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removePresent() {
    assertTrue(
        "multiset.entrySet.remove(presentEntry) returned false",
        getMultiset().entrySet().remove(Multisets.immutableEntry(e0(), 1)));
    assertFalse("multiset contains element after removing its entry", getMultiset().contains(e0()));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removeAbsent() {
    assertFalse(
        "multiset.entrySet.remove(missingEntry) returned true",
        getMultiset().entrySet().remove(Multisets.immutableEntry(e0(), 2)));
    assertTrue(
        "multiset didn't contain element after removing a missing entry",
        getMultiset().contains(e0()));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removeAllPresent() {
    assertTrue(
        "multiset.entrySet.removeAll(presentEntry) returned false",
        getMultiset()
            .entrySet()
            .removeAll(Collections.singleton(Multisets.immutableEntry(e0(), 1))));
    assertFalse("multiset contains element after removing its entry", getMultiset().contains(e0()));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removeAllAbsent() {
    assertFalse(
        "multiset.entrySet.remove(missingEntry) returned true",
        getMultiset()
            .entrySet()
            .removeAll(Collections.singleton(Multisets.immutableEntry(e0(), 2))));
    assertTrue(
        "multiset didn't contain element after removing a missing entry",
        getMultiset().contains(e0()));
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_retainAllPresent() {
    assertFalse(
        "multiset.entrySet.retainAll(presentEntry) returned false",
        getMultiset()
            .entrySet()
            .retainAll(Collections.singleton(Multisets.immutableEntry(e0(), 1))));
    assertTrue(
        "multiset doesn't contains element after retaining its entry",
        getMultiset().contains(e0()));
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_retainAllAbsent() {
    assertTrue(
        "multiset.entrySet.retainAll(missingEntry) returned true",
        getMultiset()
            .entrySet()
            .retainAll(Collections.singleton(Multisets.immutableEntry(e0(), 2))));
    assertFalse(
        "multiset contains element after retaining a different entry",
        getMultiset().contains(e0()));
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryViewReflectsRemove() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    assertTrue(getMultiset().remove(e0()));
    assertEquals(2, entry.getCount());
    assertTrue(getMultiset().elementSet().remove(e0()));
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsIteratorRemove() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    Iterator<E> itr = getMultiset().iterator();
    itr.next();
    itr.remove();
    assertEquals(2, entry.getCount());
    itr.next();
    itr.remove();
    itr.next();
    itr.remove();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsClear() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    getMultiset().clear();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsEntrySetClear() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    getMultiset().entrySet().clear();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsEntrySetIteratorRemove() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Iterator<Multiset.Entry entryItr = getMultiset().entrySet().iterator();
    Multiset.Entry<E> entry = entryItr.next();
    entryItr.remove();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsElementSetClear() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    getMultiset().elementSet().clear();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsElementSetIteratorRemove() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    Iterator<E> elementItr = getMultiset().elementSet().iterator();
    elementItr.next();
    elementItr.remove();
    assertEquals(0, entry.getCount());
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require({SUPPORTS_REMOVE, SUPPORTS_ADD})
  @MultisetFeature.Require(ENTRIES_ARE_VIEWS)
  public void testEntryReflectsRemoveThenAdd() {
    initThreeCopies();
    assertEquals(3, getMultiset().count(e0()));
    Multiset.Entry<E> entry = Iterables.getOnlyElement(getMultiset().entrySet());
    assertEquals(3, entry.getCount());
    assertTrue(getMultiset().remove(e0()));
    assertEquals(2, entry.getCount());
    assertTrue(getMultiset().elementSet().remove(e0()));
    assertEquals(0, entry.getCount());
    getMultiset().add(e0(), 2);
    assertEquals(2, entry.getCount());
  }

  public void testToString() {
    assertEquals(getMultiset().entrySet().toString(), getMultiset().toString());
  }
}

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