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import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.IntStream;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert .assertEquals;
import static org.testng.Assert .assertFalse;
import static org.testng.Assert .assertNotEquals;
import static org.testng.Assert .assertNotSame;
import static org.testng.Assert .assertSame;
import static org.testng.Assert .assertThrows;
import static org.testng.Assert .assertTrue;
/*
* @test
* @bug 8048330 8221924
* @summary Test convenience static factory methods on Map.
* @run testng MapFactories
*/
public class MapFactories {
static final int MAX_ENTRIES = 20; // should be larger than the largest fixed-arg overload
static String valueFor(int i) {
// the String literal below should be of length MAX_ENTRIES
return "abcdefghijklmnopqrst" .substring(i, i+1);
}
// for "expected" values
Map<Integer,String> genMap(int n) {
Map<Integer,String> result = new HashMap<>();
for (int i = 0; i < n; i++) {
result.put(i, valueFor(i));
}
return result;
}
// for varargs Map.Entry methods
@SuppressWarnings("unchecked" )
Map.Entry<Integer,String>[] genEmptyEntryArray1() {
return (Map.Entry<Integer,String>[])new Map.Entry<?,?>[1];
}
@SuppressWarnings("unchecked" )
Map.Entry<Integer,String>[] genEntries(int n) {
return IntStream.range(0, n)
.mapToObj(i -> Map.entry(i, valueFor(i)))
.toArray(Map.Entry[]::new );
}
// returns array of [actual, expected]
static Object[] a(Map<Integer,String> act, Map<Integer,String> exp) {
return new Object[] { act, exp };
}
@DataProvider(name="empty" )
public Iterator<Object[]> empty() {
return Collections.singletonList(
a(Map.of(), genMap(0))
).iterator();
}
@DataProvider(name="nonempty" )
@SuppressWarnings("unchecked" )
public Iterator<Object[]> nonempty() {
return Arrays.asList(
a(Map.of(0, "a" ), genMap(1)),
a(Map.of(0, "a" , 1, "b" ), genMap(2)),
a(Map.of(0, "a" , 1, "b" , 2, "c" ), genMap(3)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" ), genMap(4)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ), genMap(5)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" ), genMap(6)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" , 6, "g" ), genMap(7)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" , 6, "g" , 7, "h" ), genMap(8)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" , 6, "g" , 7, "h" , 8, "i" ), genMap(9)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" , 6, "g" , 7, "h" , 8, "i" , 9, "j" ), genMap(10)),
a(Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" , 5, "f" , 6, "g" , 7, "h" , 8, "i" , 9, "j" ),
Map.of(4, "e" , 5, "f" , 6, "g" , 7, "h" , 8, "i" , 9, "j" , 0, "a" , 1, "b" , 2, "c" , 3, "d" )),
a(Map.ofEntries(genEntries(MAX_ENTRIES)), genMap(MAX_ENTRIES))
).iterator();
}
@DataProvider(name="all" )
public Iterator<Object[]> all() {
List<Object[]> all = new ArrayList<>();
empty().forEachRemaining(all::add);
nonempty().forEachRemaining(all::add);
return all.iterator();
}
@Test(dataProvider="all" , expectedExceptions=UnsupportedOperationException.class )
public void cannotPutNew(Map<Integer,String> act, Map<Integer,String> exp) {
act.put(-1, "xyzzy" );
}
@Test(dataProvider="nonempty" , expectedExceptions=UnsupportedOperationException.class )
public void cannotPutOld(Map<Integer,String> act, Map<Integer,String> exp) {
act.put(0, "a" );
}
@Test(dataProvider="nonempty" , expectedExceptions=UnsupportedOperationException.class )
public void cannotRemove(Map<Integer,String> act, Map<Integer,String> exp) {
act.remove(act.keySet().iterator().next());
}
@Test(dataProvider="all" )
public void contentsMatch(Map<Integer,String> act, Map<Integer,String> exp) {
assertEquals(act, exp);
}
@Test(dataProvider="all" )
public void containsAllKeys(Map<Integer,String> act, Map<Integer,String> exp) {
assertTrue(act.keySet().containsAll(exp.keySet()));
assertTrue(exp.keySet().containsAll(act.keySet()));
}
@Test(dataProvider="all" )
public void containsAllValues(Map<Integer,String> act, Map<Integer,String> exp) {
assertTrue(act.values().containsAll(exp.values()));
assertTrue(exp.values().containsAll(act.values()));
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed2() {
Map<Integer, String> map = Map.of(0, "a" , 0, "b" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed3() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 0, "c" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed4() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 0, "d" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed5() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 0, "e" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed6() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
0, "f" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed7() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 0, "g" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed8() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 0, "h" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed9() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , 0, "i" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowed10() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , 8, "i" , 0, "j" );
}
@Test(expectedExceptions=IllegalArgumentException.class )
public void dupKeysDisallowedN() {
Map.Entry<Integer,String>[] entries = genEntries(MAX_ENTRIES);
entries[MAX_ENTRIES-1] = Map.entry(0, "xxx" );
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(dataProvider="all" )
public void hashCodeEquals(Map<Integer,String> act, Map<Integer,String> exp) {
assertEquals(act.hashCode(), exp.hashCode());
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed1() {
Map<Integer, String> map = Map.of(null , "a" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed1() {
Map<Integer, String> map = Map.of(0, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed2() {
Map<Integer, String> map = Map.of(0, "a" , null , "b" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed2() {
Map<Integer, String> map = Map.of(0, "a" , 1, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed3() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , null , "c" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed3() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed4() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , null , "d" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed4() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed5() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , null , "e" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed5() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed6() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
null , "f" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed6() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed7() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , null , "g" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed7() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed8() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , null , "h" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed8() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed9() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , null , "i" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed9() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , 8, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowed10() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , 8, "i" , null , "j" );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowed10() {
Map<Integer, String> map = Map.of(0, "a" , 1, "b" , 2, "c" , 3, "d" , 4, "e" ,
5, "f" , 6, "g" , 7, "h" , 8, "i" , 9, null );
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowedVar1() {
Map.Entry<Integer,String>[] entries = genEmptyEntryArray1();
entries[0] = new AbstractMap.SimpleImmutableEntry<>(null , "a" );
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowedVar1() {
Map.Entry<Integer,String>[] entries = genEmptyEntryArray1();
entries[0] = new AbstractMap.SimpleImmutableEntry<>(0, null );
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullEntryDisallowedVar1() {
Map.Entry<Integer,String>[] entries = genEmptyEntryArray1();
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullKeyDisallowedVarN() {
Map.Entry<Integer,String>[] entries = genEntries(MAX_ENTRIES);
entries[0] = new AbstractMap.SimpleImmutableEntry<>(null , "a" );
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullValueDisallowedVarN() {
Map.Entry<Integer,String>[] entries = genEntries(MAX_ENTRIES);
entries[0] = new AbstractMap.SimpleImmutableEntry<>(0, null );
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullEntryDisallowedVarN() {
Map.Entry<Integer,String>[] entries = genEntries(MAX_ENTRIES);
entries[5] = null ;
Map<Integer, String> map = Map.ofEntries(entries);
}
@Test(expectedExceptions=NullPointerException.class )
public void nullArrayDisallowed() {
Map.ofEntries((Map.Entry<?,?>[])null );
}
@Test(dataProvider="all" , expectedExceptions=NullPointerException.class )
public void containsValueNullShouldThrowNPE(Map<Integer,String> act, Map<Integer,String> exp) {
act.containsValue(null );
}
@Test(dataProvider="all" , expectedExceptions=NullPointerException.class )
public void containsKeyNullShouldThrowNPE(Map<Integer,String> act, Map<Integer,String> exp) {
act.containsKey(null );
}
@Test(dataProvider="all" , expectedExceptions=NullPointerException.class )
public void getNullShouldThrowNPE(Map<Integer,String> act, Map<Integer,String> exp) {
act.get(null );
}
@Test(dataProvider="all" )
public void serialEquality(Map<Integer, String> act, Map<Integer, String> exp) {
// assume that act.equals(exp) tested elsewhere
Map<Integer, String> copy = serialClone(act);
assertEquals(act, copy);
assertEquals(copy, exp);
}
@SuppressWarnings("unchecked" )
static <T> T serialClone(T obj) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
oos.writeObject(obj);
}
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
return (T) ois.readObject();
} catch (IOException | ClassNotFoundException e) {
throw new AssertionError(e);
}
}
Map<Integer, String> genMap() {
Map<Integer, String> map = new HashMap<>();
map.put(1, "a" );
map.put(2, "b" );
map.put(3, "c" );
return map;
}
@Test
public void copyOfResultsEqual() {
Map<Integer, String> orig = genMap();
Map<Integer, String> copy = Map.copyOf(orig);
assertEquals(orig, copy);
assertEquals(copy, orig);
}
@Test
public void copyOfModifiedUnequal() {
Map<Integer, String> orig = genMap();
Map<Integer, String> copy = Map.copyOf(orig);
orig.put(4, "d" );
assertNotEquals(orig, copy);
assertNotEquals(copy, orig);
}
@Test
public void copyOfIdentity() {
Map<Integer, String> orig = genMap();
Map<Integer, String> copy1 = Map.copyOf(orig);
Map<Integer, String> copy2 = Map.copyOf(copy1);
assertNotSame(orig, copy1);
assertSame(copy1, copy2);
}
@Test(expectedExceptions=NullPointerException.class )
public void copyOfRejectsNullMap() {
Map<Integer, String> map = Map.copyOf(null );
}
@Test(expectedExceptions=NullPointerException.class )
public void copyOfRejectsNullKey() {
Map<Integer, String> map = genMap();
map.put(null , "x" );
Map<Integer, String> copy = Map.copyOf(map);
}
@Test(expectedExceptions=NullPointerException.class )
public void copyOfRejectsNullValue() {
Map<Integer, String> map = genMap();
map.put(-1, null );
Map<Integer, String> copy = Map.copyOf(map);
}
// Map::entry tests
@Test(expectedExceptions=NullPointerException.class )
public void entryWithNullKeyDisallowed() {
Map.Entry<Integer,String> e = Map.entry(null , "x" );
}
@Test(expectedExceptions=NullPointerException.class )
public void entryWithNullValueDisallowed() {
Map.Entry<Integer,String> e = Map.entry(0, null );
}
@Test
public void entrySetValueDisallowed() {
var e = Map.entry("a" , "b" );
assertThrows(UnsupportedOperationException.class , () -> e.setValue("x" ));
}
@Test
public void entryBasicTests() {
Map.Entry<String,String> kvh1 = Map.entry("xyzzy" , "plugh" );
Map.Entry<String,String> kvh2 = Map.entry("foobar" , "blurfl" );
Map.Entry<String,String> sie = new AbstractMap.SimpleImmutableEntry<>("xyzzy" , "plugh" );
assertTrue(kvh1.equals(sie));
assertTrue(sie.equals(kvh1));
assertFalse(kvh2.equals(sie));
assertFalse(sie.equals(kvh2));
assertEquals(kvh1.hashCode(), sie.hashCode());
assertEquals(kvh1.toString(), sie.toString());
}
// Map.Entry::copyOf tests
@Test(expectedExceptions=NullPointerException.class )
public void entryCopyNullDisallowed() {
Map.Entry.copyOf(null );
}
@Test
public void entryCopyWithNullKeyDisallowed() {
var e = new AbstractMap.SimpleEntry<>(null , "b" );
assertThrows(NullPointerException.class , () -> Map.Entry.copyOf(e));
}
@Test
public void entryCopyWithNullValueDisallowed() {
var e = new AbstractMap.SimpleEntry<>("a" , null );
assertThrows(NullPointerException.class , () -> Map.Entry.copyOf(e));
}
@Test
public void entryCopySetValueDisallowed() {
var e = new AbstractMap.SimpleEntry<>("a" , "b" );
var c = Map.Entry.copyOf(e);
assertThrows(UnsupportedOperationException.class , () -> c.setValue("x" ));
}
@Test
public void entryCopyBasicTests() {
Map.Entry<String,String> orig = new AbstractMap.SimpleImmutableEntry<>("xyzzy" , "plugh" );
Map.Entry<String,String> copy1 = Map.Entry.copyOf(orig);
Map.Entry<String,String> copy2 = Map.Entry.copyOf(copy1);
assertEquals(orig, copy1);
assertEquals(copy1, orig);
assertEquals(orig, copy2);
assertEquals(copy2, orig);
assertEquals(copy1, copy2);
assertEquals(copy2, copy1);
assertNotSame(orig, copy1);
assertSame(copy1, copy2);
assertEquals(copy1.hashCode(), orig.hashCode());
assertEquals(copy1.toString(), orig.toString());
}
// compile-time test of wildcards
@Test
public void entryWildcardTests() {
Map.Entry<Integer,Double > e1 = Map.entry(1, 2.0);
Map.Entry<Float ,Long > e2 = Map.entry(3.0f, 4L);
Map<Number,Number> map = Map.ofEntries(e1, e2);
assertEquals(map.size(), 2);
}
}
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