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/*
* 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.testing.IteratorFeature.MODIFIABLE;
import static java.util.Arrays.asList;
import static org.truth0.Truth.ASSERT;
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.google.MultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringMultisetGenerator;
import junit.framework.Test;
import junit.framework.TestSuite;
import java.util.Arrays;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
/**
* Unit test for {@link LinkedHashMultiset}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
public class LinkedHashMultisetTest extends AbstractMultisetTest {
@GwtIncompatible("suite")
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTest(MultisetTestSuiteBuilder.using(linkedHashMultisetGenerator())
.named("LinkedHashMultiset")
.withFeatures(CollectionSize.ANY,
CollectionFeature.KNOWN_ORDER,
CollectionFeature.ALLOWS_NULL_VALUES,
CollectionFeature.SERIALIZABLE,
CollectionFeature.GENERAL_PURPOSE)
.createTestSuite());
suite.addTestSuite(LinkedHashMultisetTest.class);
return suite;
}
private static TestStringMultisetGenerator linkedHashMultisetGenerator() {
return new TestStringMultisetGenerator() {
@Override protected Multiset<String> create(String[] elements) {
return LinkedHashMultiset.create(asList(elements));
}
@Override
public List<String> order(List<String> insertionOrder) {
List<String> order = Lists.newArrayList();
for (String s : insertionOrder) {
int index = order.indexOf(s);
if (index == -1) {
order.add(s);
} else {
order.add(index, s);
}
}
return order;
}
};
}
@Override protected <E> Multiset<E> create() {
return LinkedHashMultiset.create();
}
public void testCreate() {
Multiset<String> multiset = LinkedHashMultiset.create();
multiset.add("foo", 2);
multiset.add("bar");
assertEquals(3, multiset.size());
assertEquals(2, multiset.count("foo"));
assertEquals("[foo x 2, bar]", multiset.toString());
}
public void testCreateWithSize() {
Multiset<String> multiset = LinkedHashMultiset.create(50);
multiset.add("foo", 2);
multiset.add("bar");
assertEquals(3, multiset.size());
assertEquals(2, multiset.count("foo"));
assertEquals("[foo x 2, bar]", multiset.toString());
}
public void testCreateFromIterable() {
Multiset<String> multiset
= LinkedHashMultiset.create(Arrays.asList("foo", "bar", "foo"));
assertEquals(3, multiset.size());
assertEquals(2, multiset.count("foo"));
assertEquals("[foo x 2, bar]", multiset.toString());
}
@GwtIncompatible("unreasonable slow")
public void testIteratorBashing() {
ms = createSample();
IteratorTester<String> tester =
new IteratorTester<String>(6, MODIFIABLE, newArrayList(ms),
IteratorTester.KnownOrder.KNOWN_ORDER) {
@Override protected Iterator<String> newTargetIterator() {
return createSample().iterator();
}
};
tester.test();
}
@GwtIncompatible("slow (~30s)")
public void testElementSetIteratorBashing() {
IteratorTester<String> tester =
new IteratorTester<String>(5, MODIFIABLE, newArrayList("a", "c", "b"),
IteratorTester.KnownOrder.KNOWN_ORDER) {
@Override protected Iterator<String> newTargetIterator() {
Multiset<String> multiset = create();
multiset.add("a", 3);
multiset.add("c", 1);
multiset.add("b", 2);
return multiset.elementSet().iterator();
}
};
tester.test();
}
public void testToString() {
ms.add("a", 3);
ms.add("c", 1);
ms.add("b", 2);
assertEquals("[a x 3, c, b x 2]", ms.toString());
}
public void testLosesPlaceInLine() throws Exception {
ms.add("a");
ms.add("b", 2);
ms.add("c");
ASSERT.that(ms.elementSet()).has().allOf("a", "b", "c").inOrder();
ms.remove("b");
ASSERT.that(ms.elementSet()).has().allOf("a", "b", "c").inOrder();
ms.add("b");
ASSERT.that(ms.elementSet()).has().allOf("a", "b", "c").inOrder();
ms.remove("b", 2);
ms.add("b");
ASSERT.that(ms.elementSet()).has().allOf("a", "c", "b").inOrder();
}
public void testIteratorRemoveConcurrentModification() {
ms.add("a");
ms.add("b");
Iterator<String> iterator = ms.iterator();
iterator.next();
ms.remove("a");
assertEquals(1, ms.size());
assertTrue(ms.contains("b"));
try {
iterator.remove();
fail();
} catch (ConcurrentModificationException expected) {}
assertEquals(1, ms.size());
assertTrue(ms.contains("b"));
}
}
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