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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.yolean.chain;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import static com.yahoo.yolean.chain.ContainsSameElements.containsSameElements;
import static com.yahoo.yolean.chain.ContainsSameElements.toIdentitySet;
import static java.util.Collections.singleton;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.collection.IsEmptyCollection.empty;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
/**
* Tests for EnumeratedIdentitySet.
*/
public class EnumeratedIdentitySetTest {
private final List<Element> elements;
public EnumeratedIdentitySetTest() {
elements = new ArrayList<>();
for (int i = 0; i < 10; i++) {
elements.add(new Element());
}
}
@Test
public void size() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
assertThat(set.size(), is(elements.size()));
set.add(elements.get(0));
assertThat(set.size(), is(elements.size()));
set.remove(elements.get(0));
assertThat(set.size(), is(elements.size() - 1));
}
@Test
public void isEmpty() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>();
assertTrue(set.isEmpty());
set.add(elements.get(0));
assertFalse(set.isEmpty());
}
@Test
public void contains2() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
assertTrue(set.contains(elements.get(0)));
assertFalse(set.contains(new Element()));
}
@Test
public void iterator() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
IdentityHashMap<Element, Void> collectedElements = new IdentityHashMap<>();
int count = 0;
for (Element element : set) {
collectedElements.put(element, null);
count++;
}
assertThat(collectedElements.size(), is(count));
assertThat(collectedElements.size(), is(elements.size()));
for (Element element : elements) {
assertTrue(collectedElements.containsKey(element));
}
}
@Test
public void toArray() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
Object[] array = set.toArray();
Element[] array2 = set.toArray(new Element[0]);
assertThat(Arrays.asList(array), containsSameElements(set));
assertThat(Arrays.asList(array2), containsSameElements(set));
}
@Test
public void add() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>();
assertTrue(set.add(elements.get(0)));
assertFalse(set.add(elements.get(0)));
}
@Test
public void remove() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
assertTrue(set.remove(elements.get(0)));
assertFalse(set.remove(elements.get(0)));
}
@Test
public void containsAll() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
assertTrue(set.containsAll(elements.subList(0, 7)));
assertTrue(set.containsAll(elements));
List<Element> extendedElements = new ArrayList<>(elements);
extendedElements.add(new Element());
assertFalse(set.containsAll(extendedElements));
}
@Test
public void addAll() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>();
set.addAll(elements);
assertThat(set, containsSameElements(elements));
}
@Test
public void retainAll() {
Set<Element> set = new EnumeratedIdentitySet<>();
set.addAll(elements.subList(0, 5));
boolean changed = set.retainAll(toIdentitySet(elements.subList(3, 10)));
assertTrue(changed);
assertThat(set, containsSameElements(elements.subList(3, 5)));
changed = set.retainAll(toIdentitySet(elements));
assertFalse(changed);
}
@Test
public void removeAll() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
set.removeAll(elements.subList(0, 5));
assertThat(set, containsSameElements(elements.subList(5, 10)));
}
@Test
public void clear() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
set.clear();
assertThat(set, empty());
}
@Test
public void removeNulls() {
Element[] singletonArray = { null, elements.get(0), null };
assertThat(EnumeratedIdentitySet.removeNulls(singletonArray),
containsSameElements(Arrays.asList(elements.get(0))));
Element[] elementsWithNull = new Element[20];
Iterator<Element> iterator = elements.iterator();
copyElementsTo(iterator, elementsWithNull, 2, 1);
copyElementsTo(iterator, elementsWithNull, 4, 8);
copyElementsTo(iterator, elementsWithNull, 19, 1);
assertThat(EnumeratedIdentitySet.removeNulls(elementsWithNull), containsSameElements(elements));
}
private void copyElementsTo(Iterator<Element> iterator, Element[] array, int startIndex, int numItems) {
for (int i = 0; i < numItems; i++) {
array[i + startIndex] = iterator.next();
}
}
@Test
public void renumber_preserves_ordering() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>();
for (int i = 0; i < 200; i++) {
set.add(new Element());
}
set.addAll(elements);
EnumeratedIdentitySet<Element> elementsToPreserve = new EnumeratedIdentitySet<>(elements);
for (Iterator<Element> i = set.iterator(); i.hasNext(); ) {
if (!elementsToPreserve.contains(i.next())) {
i.remove();
}
}
List<Element> forceRenumber = set.insertionOrderedList();
assertThat(forceRenumber.size(), is(elements.size()));
for (int i = 0; i < elements.size(); i++) {
assertSame(forceRenumber.get(i), elements.get(i));
}
set.add(new Element());
assertThat(set.numbers(), containsSameElements(range(0, 10)));
}
@Test
public void renumber_when_empty() {
EnumeratedIdentitySet<Element> set = new EnumeratedIdentitySet<>(elements);
for (Iterator<Element> i = set.iterator(); i.hasNext(); ) {
i.next();
i.remove();
}
set.insertionOrderedList();
assertThat(set.numbers(), empty());
set.add(new Element());
assertThat(set.numbers(), containsSameElements(singleton(0)));
}
private List<Integer> range(int start, int endInclusive) {
List<Integer> result = new ArrayList<>();
for (int i = start; i <= endInclusive; i++) {
result.add(i);
}
return result;
}
static class Element {
@Override
public int hashCode() {
throw new UnsupportedOperationException();
}
@Override
public boolean equals(Object obj) {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return "Element@" + System.identityHashCode(this);
}
}
}
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