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Java example source code file (EmptyNavigableMap.java)
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The EmptyNavigableMap.java Java example source code
/*
* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4533691 7129185
* @summary Unit test for Collections.emptyNavigableMap
* @run testng EmptyNavigableMap
*/
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.NavigableMap;
import java.util.SortedMap;
import java.util.TreeMap;
import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert.fail;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertSame;
public class EmptyNavigableMap {
public static <T> void assertInstance(T actual, Class expected) {
assertInstance(expected.isInstance(actual), null);
}
public static <T> void assertInstance(T actual, Class expected, String message) {
assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
+ " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
}
public static <T extends Throwable> void assertEmptyNavigableMap(Object obj) {
assertInstance(obj, NavigableMap.class);
assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0));
}
public static <T extends Throwable> void assertEmptyNavigableMap(Object obj, String message) {
assertInstance(obj, NavigableMap.class, message);
assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0),
((null != message) ? message : "") + " Not empty. ");
}
public interface Thrower<T extends Throwable> {
public void run() throws T;
}
public static <T extends Throwable> void assertThrows(Thrower thrower, Class throwable) {
assertThrows(thrower, throwable, null);
}
public static <T extends Throwable> void assertThrows(Thrower thrower, Class throwable, String message) {
Throwable result;
try {
thrower.run();
fail(((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
return;
} catch (Throwable caught) {
result = caught;
}
assertInstance(result, throwable, ((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
}
public static final boolean isDescending(SortedMap<?,?> set) {
if (null == set.comparator()) {
// natural order
return false;
}
if (Collections.reverseOrder() == set.comparator()) {
// reverse natural order.
return true;
}
if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
// it's a Collections.reverseOrder(Comparator).
return true;
}
throw new IllegalStateException("can't determine ordering for " + set);
}
/**
* Tests that the comparator is {@code null}.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testComparatorIsNull(String description, NavigableMap<?,?> navigableMap) {
Comparator comparator = navigableMap.comparator();
assertTrue(comparator == null || comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
}
/**
* Tests that contains requires Comparable
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testContainsRequiresComparable(String description, NavigableMap<?,?> navigableMap) {
assertThrows(() -> {
navigableMap.containsKey(new Object());
},
ClassCastException.class,
description + ": Compareable should be required");
}
/**
* Tests that the contains method returns {@code false}.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testContains(String description, NavigableMap<?,?> navigableMap) {
assertFalse(navigableMap.containsKey(new Integer(1)),
description + ": Should not contain any elements.");
assertFalse(navigableMap.containsValue(new Integer(1)),
description + ": Should not contain any elements.");
}
/**
* Tests that the containsAll method returns {@code false}.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testContainsAll(String description, NavigableMap<?,?> navigableMap) {
TreeMap treeMap = new TreeMap();
treeMap.put("1", 1);
treeMap.put("2", 2);
treeMap.put("3", 3);
assertFalse(navigableMap.equals(treeMap), "Should not contain any elements.");
}
/**
* Tests that the iterator is empty.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testEmptyIterator(String description, NavigableMap<?,?> navigableMap) {
assertFalse(navigableMap.keySet().iterator().hasNext(), "The iterator is not empty.");
assertFalse(navigableMap.values().iterator().hasNext(), "The iterator is not empty.");
assertFalse(navigableMap.entrySet().iterator().hasNext(), "The iterator is not empty.");
}
/**
* Tests that the set is empty.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testIsEmpty(String description, NavigableMap<?,?> navigableMap) {
assertTrue(navigableMap.isEmpty(), "The set is not empty.");
}
/**
* Tests the headMap() method.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testHeadMap(String description, NavigableMap navigableMap) {
assertThrows(
() -> { NavigableMap ss = navigableMap.headMap(null, false); },
NullPointerException.class,
description + ": Must throw NullPointerException for null element");
assertThrows(
() -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
ClassCastException.class,
description + ": Must throw ClassCastException for non-Comparable element");
NavigableMap ss = navigableMap.headMap("1", false);
assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
}
/**
* Tests that the size is 0.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testSizeIsZero(String description, NavigableMap<?,?> navigableMap) {
assertTrue(0 == navigableMap.size(), "The size of the set is not 0.");
}
/**
* Tests the subMap() method.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testSubMap(String description, NavigableMap navigableMap) {
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
},
NullPointerException.class,
description + ": Must throw NullPointerException for null element");
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(BigInteger.ZERO, null);
},
NullPointerException.class,
description + ": Must throw NullPointerException for null element");
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(null, null);
},
NullPointerException.class,
description + ": Must throw NullPointerException for null element");
Object obj1 = new Object();
Object obj2 = new Object();
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(obj1, BigInteger.TEN);
},
ClassCastException.class, description
+ ": Must throw ClassCastException for parameter which is not Comparable.");
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(BigInteger.ZERO, obj2);
},
ClassCastException.class, description
+ ": Must throw ClassCastException for parameter which is not Comparable.");
assertThrows(
() -> {
SortedMap ss = navigableMap.subMap(obj1, obj2);
},
ClassCastException.class, description
+ ": Must throw ClassCastException for parameter which is not Comparable.");
// minimal range
navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, false);
navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, true);
navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, false);
navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, true);
Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
assertThrows(
() -> {
navigableMap.subMap(last, true, first, false);
},
IllegalArgumentException.class, description
+ ": Must throw IllegalArgumentException when fromElement is not less then then toElement.");
navigableMap.subMap(first, true, last, false);
}
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testSubMapRanges(String description, NavigableMap navigableMap) {
Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
NavigableMap subMap = navigableMap.subMap(first, true, last, true);
// same subset
subMap.subMap(first, true, last, true);
// slightly smaller
NavigableMap ns = subMap.subMap(first, false, last, false);
// slight exapansion
assertThrows(() -> {
ns.subMap(first, true, last, true);
},
IllegalArgumentException.class,
description + ": Expansion should not be allowed");
// much smaller
subMap.subMap(first, false, BigInteger.ONE, false);
}
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testheadMapRanges(String description, NavigableMap navigableMap) {
NavigableMap subMap = navigableMap.headMap(BigInteger.ONE, true);
// same subset
subMap.headMap(BigInteger.ONE, true);
// slightly smaller
NavigableMap ns = subMap.headMap(BigInteger.ONE, false);
// slight exapansion
assertThrows(() -> {
ns.headMap(BigInteger.ONE, true);
},
IllegalArgumentException.class,
description + ": Expansion should not be allowed");
// much smaller
subMap.headMap(isDescending(subMap) ? BigInteger.TEN : BigInteger.ZERO, true);
}
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testTailMapRanges(String description, NavigableMap navigableMap) {
NavigableMap subMap = navigableMap.tailMap(BigInteger.ONE, true);
// same subset
subMap.tailMap(BigInteger.ONE, true);
// slightly smaller
NavigableMap ns = subMap.tailMap(BigInteger.ONE, false);
// slight exapansion
assertThrows(() -> {
ns.tailMap(BigInteger.ONE, true);
},
IllegalArgumentException.class,
description + ": Expansion should not be allowed");
// much smaller
subMap.tailMap(isDescending(subMap) ? BigInteger.ZERO : BigInteger.TEN, false);
}
/**
* Tests the tailMap() method.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testTailMap(String description, NavigableMap navigableMap) {
assertThrows(() -> {
navigableMap.tailMap(null);
},
NullPointerException.class,
description + ": Must throw NullPointerException for null element");
assertThrows(() -> {
navigableMap.tailMap(new Object());
}, ClassCastException.class);
NavigableMap ss = navigableMap.tailMap("1", true);
assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
}
@DataProvider(name = "NavigableMap<?,?>", parallel = true)
public static Iterator<Object[]> navigableMapsProvider() {
return makeNavigableMaps().iterator();
}
public static Collection<Object[]> makeNavigableMaps() {
return Arrays.asList(
new Object[]{"UnmodifiableNavigableMap(TreeMap)", Collections.unmodifiableNavigableMap(new TreeMap())},
new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap())},
new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap().descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap().descendingMap())},
new Object[]{"emptyNavigableMap()", Collections.emptyNavigableMap()},
new Object[]{"emptyNavigableMap().descendingMap()", Collections.emptyNavigableMap().descendingMap()},
new Object[]{"emptyNavigableMap().descendingMap().descendingMap()", Collections.emptyNavigableMap().descendingMap().descendingMap()}
);
}
}
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