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/*
* Copyright (C) 2012 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.truth.Truth.assertThat;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.TestStringMapGenerator;
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.List;
import java.util.Map;
import java.util.Map.Entry;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Tests for {@code CompactLinkedHashMap}.
*
* @author Louis Wasserman
*/
public class CompactLinkedHashMapTest extends TestCase {
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTest(
MapTestSuiteBuilder.using(
new TestStringMapGenerator() {
@Override
protected Map<String, String> create(Entry<String, String>[] entries) {
Map<String, String> map = CompactLinkedHashMap.create();
for (Entry<String, String> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
return map;
}
})
.named("CompactLinkedHashMap")
.withFeatures(
CollectionSize.ANY,
CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
MapFeature.GENERAL_PURPOSE,
MapFeature.ALLOWS_NULL_KEYS,
MapFeature.ALLOWS_NULL_VALUES,
CollectionFeature.SERIALIZABLE,
CollectionFeature.KNOWN_ORDER)
.createTestSuite());
suite.addTestSuite(CompactLinkedHashMapTest.class);
return suite;
}
public void testInsertionOrder() {
Map<Integer, String> map = CompactLinkedHashMap.create();
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
testHasMapEntriesInOrder(map, 1, "a", 4, "b", 3, "d", 2, "c");
}
public void testInsertionOrderAfterPutKeyTwice() {
Map<Integer, String> map = CompactLinkedHashMap.create();
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
map.put(1, "e");
testHasMapEntriesInOrder(map, 1, "e", 4, "b", 3, "d", 2, "c");
}
public void testInsertionOrderAfterRemoveFirstEntry() {
Map<Integer, String> map = CompactLinkedHashMap.create();
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
map.remove(1);
testHasMapEntriesInOrder(map, 4, "b", 3, "d", 2, "c");
}
public void testInsertionOrderAfterRemoveMiddleEntry() {
Map<Integer, String> map = CompactLinkedHashMap.create();
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
map.remove(4);
testHasMapEntriesInOrder(map, 1, "a", 3, "d", 2, "c");
}
public void testInsertionOrderAfterRemoveLastEntry() {
Map<Integer, String> map = CompactLinkedHashMap.create();
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
map.remove(2);
testHasMapEntriesInOrder(map, 1, "a", 4, "b", 3, "d");
}
public void testTrimToSize() {
CompactLinkedHashMap<Integer, String> map = CompactLinkedHashMap.createWithExpectedSize(100);
map.put(1, "a");
map.put(4, "b");
map.put(3, "d");
map.put(2, "c");
map.trimToSize();
assertThat(map.entries).hasLength(4);
assertThat(map.keys).hasLength(4);
assertThat(map.values).hasLength(4);
assertThat(map.links).hasLength(4);
assertEquals(4, map.size());
testHasMapEntriesInOrder(map, 1, "a", 4, "b", 3, "d", 2, "c");
}
private void testHasMapEntriesInOrder(Map<?, ?> map, Object... alternatingKeysAndValues) {
List<? extends Entry<?, ?>> entries = Lists.newArrayList(map.entrySet());
List<Object> keys = Lists.newArrayList(map.keySet());
List<Object> values = Lists.newArrayList(map.values());
assertEquals(2 * entries.size(), alternatingKeysAndValues.length);
assertEquals(2 * keys.size(), alternatingKeysAndValues.length);
assertEquals(2 * values.size(), alternatingKeysAndValues.length);
for (int i = 0; i < map.size(); i++) {
Object expectedKey = alternatingKeysAndValues[2 * i];
Object expectedValue = alternatingKeysAndValues[2 * i + 1];
Entry<Object, Object> expectedEntry = Maps.immutableEntry(expectedKey, expectedValue);
assertEquals(expectedEntry, entries.get(i));
assertEquals(expectedKey, keys.get(i));
assertEquals(expectedValue, values.get(i));
}
}
public void testAllocArraysDefault() {
CompactLinkedHashMap<Integer, String> map = CompactLinkedHashMap.create();
assertThat(map.needsAllocArrays()).isTrue();
assertThat(map.entries).isNull();
assertThat(map.keys).isNull();
assertThat(map.values).isNull();
assertThat(map.links).isNull();
map.put(1, Integer.toString(1));
assertThat(map.needsAllocArrays()).isFalse();
assertThat(map.entries).hasLength(CompactHashing.DEFAULT_SIZE);
assertThat(map.keys).hasLength(CompactHashing.DEFAULT_SIZE);
assertThat(map.values).hasLength(CompactHashing.DEFAULT_SIZE);
assertThat(map.links).hasLength(CompactHashing.DEFAULT_SIZE);
}
public void testAllocArraysExpectedSize() {
for (int i = 0; i <= CompactHashing.DEFAULT_SIZE; i++) {
CompactLinkedHashMap<Integer, String> map = CompactLinkedHashMap.createWithExpectedSize(i);
assertThat(map.needsAllocArrays()).isTrue();
assertThat(map.entries).isNull();
assertThat(map.keys).isNull();
assertThat(map.values).isNull();
assertThat(map.links).isNull();
map.put(1, Integer.toString(1));
assertThat(map.needsAllocArrays()).isFalse();
int expectedSize = Math.max(1, i);
assertThat(map.entries).hasLength(expectedSize);
assertThat(map.keys).hasLength(expectedSize);
assertThat(map.values).hasLength(expectedSize);
assertThat(map.links).hasLength(expectedSize);
}
}
}
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