369 lines
13 KiB
Java
369 lines
13 KiB
Java
/*
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* Copyright (C) 2007 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import static com.google.common.collect.BoundType.CLOSED;
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import static com.google.common.truth.Truth.assertThat;
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import static java.util.Collections.sort;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.annotations.GwtIncompatible;
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import com.google.common.collect.testing.Helpers.NullsBeforeB;
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import com.google.common.collect.testing.NavigableSetTestSuiteBuilder;
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import com.google.common.collect.testing.TestStringSetGenerator;
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import com.google.common.collect.testing.features.CollectionFeature;
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import com.google.common.collect.testing.features.CollectionSize;
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import com.google.common.collect.testing.google.MultisetFeature;
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import com.google.common.collect.testing.google.SortedMultisetTestSuiteBuilder;
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import com.google.common.collect.testing.google.TestStringMultisetGenerator;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Set;
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import java.util.SortedSet;
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import junit.framework.Test;
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import junit.framework.TestCase;
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import junit.framework.TestSuite;
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/**
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* Unit test for {@link TreeMultiset}.
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*
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* @author Neal Kanodia
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*/
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@GwtCompatible(emulated = true)
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public class TreeMultisetTest extends TestCase {
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@GwtIncompatible // suite
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public static Test suite() {
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TestSuite suite = new TestSuite();
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suite.addTest(
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SortedMultisetTestSuiteBuilder.using(
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new TestStringMultisetGenerator() {
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@Override
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protected Multiset<String> create(String[] elements) {
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return TreeMultiset.create(Arrays.asList(elements));
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}
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@Override
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public List<String> order(List<String> insertionOrder) {
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return Ordering.natural().sortedCopy(insertionOrder);
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}
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})
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.withFeatures(
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CollectionSize.ANY,
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CollectionFeature.KNOWN_ORDER,
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CollectionFeature.GENERAL_PURPOSE,
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CollectionFeature.SERIALIZABLE,
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CollectionFeature.ALLOWS_NULL_QUERIES,
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MultisetFeature.ENTRIES_ARE_VIEWS)
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.named("TreeMultiset, Ordering.natural")
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.createTestSuite());
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suite.addTest(
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SortedMultisetTestSuiteBuilder.using(
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new TestStringMultisetGenerator() {
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@Override
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protected Multiset<String> create(String[] elements) {
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Multiset<String> result = TreeMultiset.create(NullsBeforeB.INSTANCE);
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Collections.addAll(result, elements);
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return result;
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}
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@Override
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public List<String> order(List<String> insertionOrder) {
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sort(insertionOrder, NullsBeforeB.INSTANCE);
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return insertionOrder;
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}
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})
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.withFeatures(
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CollectionSize.ANY,
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CollectionFeature.KNOWN_ORDER,
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CollectionFeature.GENERAL_PURPOSE,
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CollectionFeature.SERIALIZABLE,
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CollectionFeature.ALLOWS_NULL_VALUES,
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MultisetFeature.ENTRIES_ARE_VIEWS)
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.named("TreeMultiset, NullsBeforeB")
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.createTestSuite());
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suite.addTest(
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NavigableSetTestSuiteBuilder.using(
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new TestStringSetGenerator() {
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@Override
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protected Set<String> create(String[] elements) {
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return TreeMultiset.create(Arrays.asList(elements)).elementSet();
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}
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@Override
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public List<String> order(List<String> insertionOrder) {
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return Lists.newArrayList(Sets.newTreeSet(insertionOrder));
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}
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})
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.named("TreeMultiset[Ordering.natural].elementSet")
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.withFeatures(
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CollectionSize.ANY,
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CollectionFeature.REMOVE_OPERATIONS,
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CollectionFeature.ALLOWS_NULL_QUERIES)
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.createTestSuite());
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suite.addTestSuite(TreeMultisetTest.class);
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return suite;
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}
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public void testCreate() {
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TreeMultiset<String> multiset = TreeMultiset.create();
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multiset.add("foo", 2);
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multiset.add("bar");
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assertEquals(3, multiset.size());
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assertEquals(2, multiset.count("foo"));
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assertEquals(Ordering.natural(), multiset.comparator());
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assertEquals("[bar, foo x 2]", multiset.toString());
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}
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public void testCreateWithComparator() {
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Multiset<String> multiset = TreeMultiset.create(Collections.reverseOrder());
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multiset.add("foo", 2);
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multiset.add("bar");
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assertEquals(3, multiset.size());
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assertEquals(2, multiset.count("foo"));
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assertEquals("[foo x 2, bar]", multiset.toString());
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}
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public void testCreateFromIterable() {
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Multiset<String> multiset = TreeMultiset.create(Arrays.asList("foo", "bar", "foo"));
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assertEquals(3, multiset.size());
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assertEquals(2, multiset.count("foo"));
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assertEquals("[bar, foo x 2]", multiset.toString());
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}
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public void testToString() {
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Multiset<String> ms = TreeMultiset.create();
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ms.add("a", 3);
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ms.add("c", 1);
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ms.add("b", 2);
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assertEquals("[a x 3, b x 2, c]", ms.toString());
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}
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public void testElementSetSortedSetMethods() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("c", 1);
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ms.add("a", 3);
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ms.add("b", 2);
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SortedSet<String> elementSet = ms.elementSet();
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assertEquals("a", elementSet.first());
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assertEquals("c", elementSet.last());
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assertEquals(Ordering.natural(), elementSet.comparator());
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assertThat(elementSet.headSet("b")).containsExactly("a");
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assertThat(elementSet.tailSet("b")).containsExactly("b", "c").inOrder();
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assertThat(elementSet.subSet("a", "c")).containsExactly("a", "b").inOrder();
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}
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public void testElementSetSubsetRemove() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("a", 1);
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ms.add("b", 3);
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ms.add("c", 2);
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ms.add("d", 1);
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ms.add("e", 3);
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ms.add("f", 2);
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SortedSet<String> elementSet = ms.elementSet();
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assertThat(elementSet).containsExactly("a", "b", "c", "d", "e", "f").inOrder();
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SortedSet<String> subset = elementSet.subSet("b", "f");
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assertThat(subset).containsExactly("b", "c", "d", "e").inOrder();
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assertTrue(subset.remove("c"));
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assertThat(elementSet).containsExactly("a", "b", "d", "e", "f").inOrder();
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assertThat(subset).containsExactly("b", "d", "e").inOrder();
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assertEquals(10, ms.size());
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assertFalse(subset.remove("a"));
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assertThat(elementSet).containsExactly("a", "b", "d", "e", "f").inOrder();
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assertThat(subset).containsExactly("b", "d", "e").inOrder();
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assertEquals(10, ms.size());
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}
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public void testElementSetSubsetRemoveAll() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("a", 1);
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ms.add("b", 3);
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ms.add("c", 2);
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ms.add("d", 1);
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ms.add("e", 3);
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ms.add("f", 2);
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SortedSet<String> elementSet = ms.elementSet();
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assertThat(elementSet).containsExactly("a", "b", "c", "d", "e", "f").inOrder();
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SortedSet<String> subset = elementSet.subSet("b", "f");
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assertThat(subset).containsExactly("b", "c", "d", "e").inOrder();
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assertTrue(subset.removeAll(Arrays.asList("a", "c")));
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assertThat(elementSet).containsExactly("a", "b", "d", "e", "f").inOrder();
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assertThat(subset).containsExactly("b", "d", "e").inOrder();
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assertEquals(10, ms.size());
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}
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public void testElementSetSubsetRetainAll() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("a", 1);
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ms.add("b", 3);
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ms.add("c", 2);
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ms.add("d", 1);
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ms.add("e", 3);
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ms.add("f", 2);
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SortedSet<String> elementSet = ms.elementSet();
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assertThat(elementSet).containsExactly("a", "b", "c", "d", "e", "f").inOrder();
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SortedSet<String> subset = elementSet.subSet("b", "f");
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assertThat(subset).containsExactly("b", "c", "d", "e").inOrder();
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assertTrue(subset.retainAll(Arrays.asList("a", "c")));
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assertThat(elementSet).containsExactly("a", "c", "f").inOrder();
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assertThat(subset).containsExactly("c");
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assertEquals(5, ms.size());
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}
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public void testElementSetSubsetClear() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("a", 1);
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ms.add("b", 3);
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ms.add("c", 2);
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ms.add("d", 1);
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ms.add("e", 3);
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ms.add("f", 2);
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SortedSet<String> elementSet = ms.elementSet();
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assertThat(elementSet).containsExactly("a", "b", "c", "d", "e", "f").inOrder();
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SortedSet<String> subset = elementSet.subSet("b", "f");
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assertThat(subset).containsExactly("b", "c", "d", "e").inOrder();
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subset.clear();
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assertThat(elementSet).containsExactly("a", "f").inOrder();
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assertThat(subset).isEmpty();
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assertEquals(3, ms.size());
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}
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public void testCustomComparator() throws Exception {
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Comparator<String> comparator =
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new Comparator<String>() {
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@Override
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public int compare(String o1, String o2) {
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return o2.compareTo(o1);
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}
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};
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TreeMultiset<String> ms = TreeMultiset.create(comparator);
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ms.add("b");
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ms.add("c");
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ms.add("a");
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ms.add("b");
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ms.add("d");
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assertThat(ms).containsExactly("d", "c", "b", "b", "a").inOrder();
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SortedSet<String> elementSet = ms.elementSet();
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assertEquals("d", elementSet.first());
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assertEquals("a", elementSet.last());
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assertEquals(comparator, elementSet.comparator());
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}
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public void testNullAcceptingComparator() throws Exception {
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Comparator<String> comparator = Ordering.<String>natural().nullsFirst();
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TreeMultiset<String> ms = TreeMultiset.create(comparator);
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ms.add("b");
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ms.add(null);
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ms.add("a");
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ms.add("b");
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ms.add(null, 2);
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assertThat(ms).containsExactly(null, null, null, "a", "b", "b").inOrder();
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assertEquals(3, ms.count(null));
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SortedSet<String> elementSet = ms.elementSet();
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assertEquals(null, elementSet.first());
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assertEquals("b", elementSet.last());
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assertEquals(comparator, elementSet.comparator());
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}
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private static final Comparator<String> DEGENERATE_COMPARATOR =
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new Comparator<String>() {
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@Override
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public int compare(String o1, String o2) {
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return o1.length() - o2.length();
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}
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};
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/** Test a TreeMultiset with a comparator that can return 0 when comparing unequal values. */
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public void testDegenerateComparator() throws Exception {
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TreeMultiset<String> ms = TreeMultiset.create(DEGENERATE_COMPARATOR);
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ms.add("foo");
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ms.add("a");
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ms.add("bar");
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ms.add("b");
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ms.add("c");
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assertEquals(2, ms.count("bar"));
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assertEquals(3, ms.count("b"));
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Multiset<String> ms2 = TreeMultiset.create(DEGENERATE_COMPARATOR);
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ms2.add("cat", 2);
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ms2.add("x", 3);
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assertEquals(ms, ms2);
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assertEquals(ms2, ms);
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SortedSet<String> elementSet = ms.elementSet();
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assertEquals("a", elementSet.first());
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assertEquals("foo", elementSet.last());
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assertEquals(DEGENERATE_COMPARATOR, elementSet.comparator());
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}
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public void testSubMultisetSize() {
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TreeMultiset<String> ms = TreeMultiset.create();
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ms.add("a", Integer.MAX_VALUE);
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ms.add("b", Integer.MAX_VALUE);
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ms.add("c", 3);
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assertEquals(Integer.MAX_VALUE, ms.count("a"));
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assertEquals(Integer.MAX_VALUE, ms.count("b"));
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assertEquals(3, ms.count("c"));
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assertEquals(Integer.MAX_VALUE, ms.headMultiset("c", CLOSED).size());
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assertEquals(Integer.MAX_VALUE, ms.headMultiset("b", CLOSED).size());
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assertEquals(Integer.MAX_VALUE, ms.headMultiset("a", CLOSED).size());
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assertEquals(3, ms.tailMultiset("c", CLOSED).size());
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assertEquals(Integer.MAX_VALUE, ms.tailMultiset("b", CLOSED).size());
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assertEquals(Integer.MAX_VALUE, ms.tailMultiset("a", CLOSED).size());
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}
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@GwtIncompatible // reflection
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@AndroidIncompatible // Reflection bug, or actual binary compatibility problem?
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public void testElementSetBridgeMethods() {
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for (Method m : TreeMultiset.class.getMethods()) {
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if (m.getName().equals("elementSet") && m.getReturnType().equals(SortedSet.class)) {
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return;
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}
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}
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fail("No bridge method found");
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}
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}
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