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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import org.junit.Test;
import static org.junit.Assert.*;
public class HashletTestCase {
@Test
public void testCopyEmptyHashlet() {
Hashlet<String, Integer> hash = new Hashlet<>();
Hashlet<String, Integer> hash2 = new Hashlet<>(hash);
assertEquals(0, hash.size());
assertEquals(0, hash2.size());
hash.put("foo", 5);
hash2.put("bar", 7);
assertEquals(5, hash.get("foo").intValue());
assertNull(hash.get("bar"));
assertNull(hash2.get("foo"));
assertEquals(7, hash2.get("bar").intValue());
}
private void verifyEquals(Object a, Object b) {
assertEquals(a, b);
assertEquals(b, a);
}
private void verifyNotEquals(Object a, Object b) {
assertNotEquals(a, b);
assertNotEquals(b, a);
}
@Test
public void testThatDifferentGenericsDoesNotEqual() {
Hashlet<Long, Long> a = new Hashlet<>();
Hashlet<String, Integer> b = new Hashlet<>();
verifyEquals(a, b);
b.put("a", 1);
verifyNotEquals(a, b);
a.put(1L, 1L);
verifyNotEquals(a, b);
}
@Test
public void testHashCodeAndEquals() {
Hashlet<String, Integer> h1 = new Hashlet<>();
Hashlet<String, Integer> h2 = new Hashlet<>();
assertEquals(h1.hashCode(), h2.hashCode());
verifyEquals(h1, h2);
h1.put("a", 7);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h2.put("b", 8);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h2.put("a", 7);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h1.put("b", 8);
assertEquals(h1.hashCode(), h2.hashCode());
verifyEquals(h1, h2);
h1.put("c", null);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h2.put("d", null);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h2.put("c", null);
assertNotEquals(h1.hashCode(), h2.hashCode());
verifyNotEquals(h1, h2);
h1.put("d", null);
assertEquals(h1.hashCode(), h2.hashCode());
verifyEquals(h1, h2);
}
@Test
public void testSetValue() {
String A = "a";
Hashlet<String, Integer> h = new Hashlet<>();
h.put(A, 1);
int indexOfA = h.getIndexOfKey(A);
assertEquals(Integer.valueOf(1), h.value(indexOfA));
h.setValue(indexOfA, 2);
assertEquals(Integer.valueOf(2), h.value(indexOfA));
assertEquals(Integer.valueOf(2), h.get(A));
}
@Test
public void testGet() {
Hashlet<String, Integer> h = new Hashlet<>();
h.put("a", 1);
h.put("b", null);
assertEquals(0, h.getIndexOfKey("a"));
assertEquals(h.get("a"), h.value(h.getIndexOfKey("a")));
assertEquals(1, h.getIndexOfKey("b"));
assertEquals(h.get("b"), h.value(h.getIndexOfKey("b")));
assertEquals(-1, h.getIndexOfKey("c"));
assertNull(h.get("c"));
}
@Test
public void testCopyNonEmptyHashlet() {
Hashlet<String, Integer> hash = new Hashlet<>();
hash.put("foo", 5);
hash.put("bar", 7);
Hashlet<String, Integer> hash2 = new Hashlet<>(hash);
assertEquals(2, hash2.size());
assertEquals(5, hash2.get("foo").intValue());
assertEquals(7, hash2.get("bar").intValue());
assertEquals("foo", hash2.key(0));
assertEquals("bar", hash2.key(1));
assertEquals(5, hash2.value(0).intValue());
assertEquals(7, hash2.value(1).intValue());
assertSame(hash2.key(0), hash.key(0));
assertSame(hash2.key(1), hash.key(1));
assertSame(hash2.value(0), hash.value(0));
assertSame(hash2.value(1), hash.value(1));
}
@Test
public void testSetValueToNull() {
Hashlet<String, Integer> hash = new Hashlet<>();
hash.put("foo", 5);
hash.put("bar", 7);
assertEquals(2, hash.size());
assertEquals(5, hash.get("foo").intValue());
assertEquals(7, hash.get("bar").intValue());
assertEquals("foo", hash.key(0));
assertEquals("bar", hash.key(1));
assertEquals(5, hash.value(0).intValue());
assertEquals(7, hash.value(1).intValue());
hash.put("foo", null);
assertEquals(2, hash.size());
assertNull(hash.get("foo"));
assertEquals(7, hash.get("bar").intValue());
assertEquals("foo", hash.key(0));
assertEquals("bar", hash.key(1));
assertNull(hash.value(0));
assertEquals(7, hash.value(1).intValue());
}
@Test
public void testIterate() {
int n = 100;
Hashlet<String, Integer> hash = new Hashlet<>();
for (int i = 0; i < n; i++) {
String str = ("" + i + "_str_" + i);
hash.put(str, i);
}
assertEquals(n, hash.size());
for (int i = 0; i < n; i++) {
String str = ("" + i + "_str_" + i);
assertEquals(str, hash.key(i));
assertEquals(i, hash.value(i).intValue());
}
}
@Test
public void testManyEntries() {
int n = 5000;
Hashlet<String, Integer> hash = new Hashlet<>();
for (int i = 0; i < n; i++) {
String str = ("" + i + "_str_" + i);
assertNull(hash.get(str));
switch (i % 2) {
case 1: assertNull(hash.put(str, i));
}
}
assertEquals(n / 2, hash.size());
for (int i = 0; i < n; i++) {
String str = ("" + i + "_str_" + i);
switch (i % 2) {
case 0: assertNull(hash.get(str)); break;
case 1: assertEquals(i, hash.get(str).intValue()); break;
}
}
}
}
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