/*
* Copyright (C) 2007 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.collect.Maps.transformEntries;
import static com.google.common.collect.testing.testers.CollectionIteratorTester.getIteratorUnknownOrderRemoveSupportedMethod;
import static org.junit.contrib.truth.Truth.ASSERT;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Equivalence;
import com.google.common.base.Equivalences;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Maps.EntryTransformer;
import com.google.common.collect.Maps.ValueDifferenceImpl;
import com.google.common.collect.SetsTest.Derived;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.SortedMapInterfaceTest;
import com.google.common.collect.testing.TestStringMapGenerator;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.NullPointerTester;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumMap;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentMap;
/**
* Unit test for {@code Maps}.
*
* @author Kevin Bourrillion
* @author Mike Bostock
* @author Jared Levy
*/
@GwtCompatible(emulated = true)
public class MapsTest extends TestCase {
private static final Comparator<Integer> SOME_COMPARATOR =
Collections.reverseOrder();
public void testHashMap() {
HashMap<Integer, Integer> map = Maps.newHashMap();
assertEquals(Collections.emptyMap(), map);
}
public void testHashMapWithInitialMap() {
Map<String, Integer> original = new TreeMap<String, Integer>();
original.put("a", 1);
original.put("b", 2);
original.put("c", 3);
HashMap<String, Integer> map = Maps.newHashMap(original);
assertEquals(original, map);
}
public void testHashMapGeneralizesTypes() {
Map<String, Integer> original = new TreeMap<String, Integer>();
original.put("a", 1);
original.put("b", 2);
original.put("c", 3);
HashMap<Object, Object> map =
Maps.newHashMap((Map<? extends Object, ? extends Object>) original);
assertEquals(original, map);
}
public void testCapacityForNegativeSizeFails() {
try {
Maps.capacity(-1);
fail("Negative expected size must result in IllegalArgumentException");
} catch (IllegalArgumentException ex) {
}
}
/**
* Tests that nHMWES makes hash maps large enough that adding the expected
* number of elements won't cause a rehash.
*
* This test may fail miserably on non-OpenJDK environments...
*/
@GwtIncompatible("reflection")
public void testNewHashMapWithExpectedSize_wontGrow() throws Exception {
for (int size = 0; size < 200; size++) {
HashMap<Integer, Void> map1 = Maps.newHashMapWithExpectedSize(size);
int startSize = sizeOf(map1);
for (int i = 0; i < size; i++) {
map1.put(i, null);
}
assertEquals("table size after adding " + size + "elements",
startSize, sizeOf(map1));
/*
* Something slightly different happens when the entries are added all at
* once; make sure that passes too.
*/
HashMap<Integer, Void> map2 = Maps.newHashMapWithExpectedSize(size);
map2.putAll(map1);
assertEquals("table size after adding " + size + "elements",
startSize, sizeOf(map2));
}
}
@GwtIncompatible("reflection")
private static int sizeOf(HashMap<?, ?> hashMap) throws Exception {
Field tableField = HashMap.class.getDeclaredField("table");
tableField.setAccessible(true);
Object[] table = (Object[]) tableField.get(hashMap);
return table.length;
}
public void testCapacityForLargeSizes() {
int[] largeExpectedSizes = new int[] {
Integer.MAX_VALUE / 2 - 1,
Integer.MAX_VALUE / 2,
Integer.MAX_VALUE / 2 + 1,
Integer.MAX_VALUE - 1,
Integer.MAX_VALUE};
for (int expectedSize : largeExpectedSizes) {
int capacity = Maps.capacity(expectedSize);
assertTrue(
"capacity (" + capacity + ") must be >= expectedSize (" + expectedSize + ")",
capacity >= expectedSize);
}
}
public void testLinkedHashMap() {
LinkedHashMap<Integer, Integer> map = Maps.newLinkedHashMap();
assertEquals(Collections.emptyMap(), map);
}
@SuppressWarnings("serial")
public void testLinkedHashMapWithInitialMap() {
Map<String, String> map = new LinkedHashMap<String, String>() {{
put("Hello", "World");
put("first", "second");
put("polygene", "lubricants");
put("alpha", "betical");
}};
LinkedHashMap<String, String> copy = Maps.newLinkedHashMap(map);
Iterator<Entry<String, String>> iter = copy.entrySet().iterator();
assertTrue(iter.hasNext());
Entry<String, String> entry = iter.next();
assertEquals("Hello", entry.getKey());
assertEquals("World", entry.getValue());
assertTrue(iter.hasNext());
entry = iter.next();
assertEquals("first", entry.getKey());
assertEquals("second", entry.getValue());
assertTrue(iter.hasNext());
entry = iter.next();
assertEquals("polygene", entry.getKey());
assertEquals("lubricants", entry.getValue());
assertTrue(iter.hasNext());
entry = iter.next();
assertEquals("alpha", entry.getKey());
assertEquals("betical", entry.getValue());
assertFalse(iter.hasNext());
}
public void testLinkedHashMapGeneralizesTypes() {
Map<String, Integer> original = new LinkedHashMap<String, Integer>();
original.put("a", 1);
original.put("b", 2);
original.put("c", 3);
HashMap<Object, Object> map
= Maps.<Object, Object>newLinkedHashMap(original);
assertEquals(original, map);
}
public void testIdentityHashMap() {
IdentityHashMap<Integer, Integer> map = Maps.newIdentityHashMap();
assertEquals(Collections.emptyMap(), map);
}
public void testConcurrentMap() {
ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
assertEquals(Collections.emptyMap(), map);
}
public void testTreeMap() {
TreeMap<Integer, Integer> map = Maps.newTreeMap();
assertEquals(Collections.emptyMap(), map);
assertNull(map.comparator());
}
public void testTreeMapDerived() {
TreeMap<Derived, Integer> map = Maps.newTreeMap();
assertEquals(Collections.emptyMap(), map);
map.put(new Derived("foo"), 1);
map.put(new Derived("bar"), 2);
ASSERT.that(map.keySet()).hasContentsInOrder(
new Derived("bar"), new Derived("foo"));
ASSERT.that(map.values()).hasContentsInOrder(2, 1);
assertNull(map.comparator());
}
public void testTreeMapNonGeneric() {
TreeMap<LegacyComparable, Integer> map = Maps.newTreeMap();
assertEquals(Collections.emptyMap(), map);
map.put(new LegacyComparable("foo"), 1);
map.put(new LegacyComparable("bar"), 2);
ASSERT.that(map.keySet()).hasContentsInOrder(
new LegacyComparable("bar"), new LegacyComparable("foo"));
ASSERT.that(map.values()).hasContentsInOrder(2, 1);
assertNull(map.comparator());
}
public void testTreeMapWithComparator() {
TreeMap<Integer, Integer> map = Maps.newTreeMap(SOME_COMPARATOR);
assertEquals(Collections.emptyMap(), map);
assertSame(SOME_COMPARATOR, map.comparator());
}
public void testTreeMapWithInitialMap() {
SortedMap<Integer, Integer> map = Maps.newTreeMap();
map.put(5, 10);
map.put(3, 20);
map.put(1, 30);
TreeMap<Integer, Integer> copy = Maps.newTreeMap(map);
assertEquals(copy, map);
assertSame(copy.comparator(), map.comparator());
}
public enum SomeEnum { SOME_INSTANCE }
public void testEnumMap() {
EnumMap<SomeEnum, Integer> map = Maps.newEnumMap(SomeEnum.class);
assertEquals(Collections.emptyMap(), map);
map.put(SomeEnum.SOME_INSTANCE, 0);
assertEquals(Collections.singletonMap(SomeEnum.SOME_INSTANCE, 0), map);
}
public void testEnumMapNullClass() {
try {
Maps.<SomeEnum, Long>newEnumMap((Class<MapsTest.SomeEnum>) null);
fail("no exception thrown");
} catch (NullPointerException expected) {
}
}
public void testEnumMapWithInitialEnumMap() {
EnumMap<SomeEnum, Integer> original = Maps.newEnumMap(SomeEnum.class);
original.put(SomeEnum.SOME_INSTANCE, 0);
EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
assertEquals(original, copy);
}
public void testEnumMapWithInitialEmptyEnumMap() {
EnumMap<SomeEnum, Integer> original = Maps.newEnumMap(SomeEnum.class);
EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
assertEquals(original, copy);
assertNotSame(original, copy);
}
public void testEnumMapWithInitialMap() {
HashMap<SomeEnum, Integer> original = Maps.newHashMap();
original.put(SomeEnum.SOME_INSTANCE, 0);
EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
assertEquals(original, copy);
}
public void testEnumMapWithInitialEmptyMap() {
Map<SomeEnum, Integer> original = Maps.newHashMap();
try {
Maps.newEnumMap(original);
fail("Empty map must result in an IllegalArgumentException");
} catch (IllegalArgumentException expected) {}
}
public void testToStringImplWithNullKeys() throws Exception {
Map<String, String> hashmap = Maps.newHashMap();
hashmap.put("foo", "bar");
hashmap.put(null, "baz");
assertEquals(hashmap.toString(), Maps.toStringImpl(hashmap));
}
public void testToStringImplWithNullValues() throws Exception {
Map<String, String> hashmap = Maps.newHashMap();
hashmap.put("foo", "bar");
hashmap.put("baz", null);
assertEquals(hashmap.toString(), Maps.toStringImpl(hashmap));
}
@GwtIncompatible("NullPointerTester")
public void testNullPointerExceptions() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(BiMap.class, ImmutableBiMap.of());
tester.setDefault(EntryTransformer.class, ALWAYS_NULL);
tester.setDefault(Equivalence.class, Equivalences.equals());
tester.setDefault(SortedMap.class, Maps.newTreeMap());
tester.testAllPublicStaticMethods(Maps.class);
}
private static final EntryTransformer<Object, Object, Object> ALWAYS_NULL =
new EntryTransformer<Object, Object, Object>() {
@Override
public Object transformEntry(Object k, Object v1) {
return null;
}
};
private static final Map<Integer, Integer> EMPTY
= Collections.emptyMap();
private static final Map<Integer, Integer> SINGLETON
= Collections.singletonMap(1, 2);
public void testMapDifferenceEmptyEmpty() {
MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, EMPTY);
assertTrue(diff.areEqual());
assertEquals(EMPTY, diff.entriesOnlyOnLeft());
assertEquals(EMPTY, diff.entriesOnlyOnRight());
assertEquals(EMPTY, diff.entriesInCommon());
assertEquals(EMPTY, diff.entriesDiffering());
assertEquals("equal", diff.toString());
}
public void testMapDifferenceEmptySingleton() {
MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, SINGLETON);
assertFalse(diff.areEqual());
assertEquals(EMPTY, diff.entriesOnlyOnLeft());
assertEquals(SINGLETON, diff.entriesOnlyOnRight());
assertEquals(EMPTY, diff.entriesInCommon());
assertEquals(EMPTY, diff.entriesDiffering());
assertEquals("not equal: only on right={1=2}", diff.toString());
}
public void testMapDifferenceSingletonEmpty() {
MapDifference<Integer, Integer> diff = Maps.difference(SINGLETON, EMPTY);
assertFalse(diff.areEqual());
assertEquals(SINGLETON, diff.entriesOnlyOnLeft());
assertEquals(EMPTY, diff.entriesOnlyOnRight());
assertEquals(EMPTY, diff.entriesInCommon());
assertEquals(EMPTY, diff.entriesDiffering());
assertEquals("not equal: only on left={1=2}", diff.toString());
}
public void testMapDifferenceTypical() {
Map<Integer, String> left = ImmutableMap.of(
1, "a", 2, "b", 3, "c", 4, "d", 5, "e");
Map<Integer, String> right = ImmutableMap.of(
1, "a", 3, "f", 5, "g", 6, "z");
MapDifference<Integer, String> diff1 = Maps.difference(left, right);
assertFalse(diff1.areEqual());
assertEquals(ImmutableMap.of(2, "b", 4, "d"), diff1.entriesOnlyOnLeft());
assertEquals(ImmutableMap.of(6, "z"), diff1.entriesOnlyOnRight());
assertEquals(ImmutableMap.of(1, "a"), diff1.entriesInCommon());
assertEquals(ImmutableMap.of(3,
ValueDifferenceImpl.create("c", "f"), 5,
ValueDifferenceImpl.create("e", "g")),
diff1.entriesDiffering());
assertEquals("not equal: only on left={2=b, 4=d}: only on right={6=z}: "
+ "value differences={3=(c, f), 5=(e, g)}", diff1.toString());
MapDifference<Integer, String> diff2 = Maps.difference(right, left);
assertFalse(diff2.areEqual());
assertEquals(ImmutableMap.of(6, "z"), diff2.entriesOnlyOnLeft());
assertEquals(ImmutableMap.of(2, "b", 4, "d"), diff2.entriesOnlyOnRight());
assertEquals(ImmutableMap.of(1, "a"), diff2.entriesInCommon());
assertEquals(ImmutableMap.of(3,
ValueDifferenceImpl.create("f", "c"), 5,
ValueDifferenceImpl.create("g", "e")),
diff2.entriesDiffering());
assertEquals("not equal: only on left={6=z}: only on right={2=b, 4=d}: "
+ "value differences={3=(f, c), 5=(g, e)}", diff2.toString());
}
public void testMapDifferenceEquals() {
Map<Integer, String> left = ImmutableMap.of(
1, "a", 2, "b", 3, "c", 4, "d", 5, "e");
Map<Integer, String> right = ImmutableMap.of(
1, "a", 3, "f", 5, "g", 6, "z");
Map<Integer, String> right2 = ImmutableMap.of(
1, "a", 3, "h", 5, "g", 6, "z");
MapDifference<Integer, String> original = Maps.difference(left, right);
MapDifference<Integer, String> same = Maps.difference(left, right);
MapDifference<Integer, String> reverse = Maps.difference(right, left);
MapDifference<Integer, String> diff2 = Maps.difference(left, right2);
new EqualsTester()
.addEqualityGroup(original, same)
.addEqualityGroup(reverse)
.addEqualityGroup(diff2)
.testEquals();
}
public void testMapDifferencePredicateTypical() {
Map<Integer, String> left = ImmutableMap.of(
1, "a", 2, "b", 3, "c", 4, "d", 5, "e");
Map<Integer, String> right = ImmutableMap.of(
1, "A", 3, "F", 5, "G", 6, "Z");
// TODO(kevinb): replace with Ascii.caseInsensitiveEquivalence() when it
// exists
Equivalence<String> caseInsensitiveEquivalence = Equivalences.equals().onResultOf(
new Function<String, String>() {
@Override public String apply(String input) {
return input.toLowerCase();
}
});
MapDifference<Integer, String> diff1 = Maps.difference(left, right,
caseInsensitiveEquivalence);
assertFalse(diff1.areEqual());
assertEquals(ImmutableMap.of(2, "b", 4, "d"), diff1.entriesOnlyOnLeft());
assertEquals(ImmutableMap.of(6, "Z"), diff1.entriesOnlyOnRight());
assertEquals(ImmutableMap.of(1, "a"), diff1.entriesInCommon());
assertEquals(ImmutableMap.of(3,
ValueDifferenceImpl.create("c", "F"), 5,
ValueDifferenceImpl.create("e", "G")),
diff1.entriesDiffering());
assertEquals("not equal: only on left={2=b, 4=d}: only on right={6=Z}: "
+ "value differences={3=(c, F), 5=(e, G)}", diff1.toString());
MapDifference<Integer, String> diff2 = Maps.difference(right, left,
caseInsensitiveEquivalence);
assertFalse(diff2.areEqual());
assertEquals(ImmutableMap.of(6, "Z"), diff2.entriesOnlyOnLeft());
assertEquals(ImmutableMap.of(2, "b", 4, "d"), diff2.entriesOnlyOnRight());
assertEquals(ImmutableMap.of(1, "A"), diff2.entriesInCommon());
assertEquals(ImmutableMap.of(3,
ValueDifferenceImpl.create("F", "c"), 5,
ValueDifferenceImpl.create("G", "e")),
diff2.entriesDiffering());
assertEquals("not equal: only on left={6=Z}: only on right={2=b, 4=d}: "
+ "value differences={3=(F, c), 5=(G, e)}", diff2.toString());
}
private static final SortedMap<Integer, Integer> SORTED_EMPTY = Maps.newTreeMap();
private static final SortedMap<Integer, Integer> SORTED_SINGLETON =
ImmutableSortedMap.of(1, 2);
public void testMapDifferenceOfSortedMapIsSorted() {
Map<Integer, Integer> map = SORTED_SINGLETON;
MapDifference<Integer, Integer> difference = Maps.difference(map, EMPTY);
assertTrue(difference instanceof SortedMapDifference);
}
public void testSortedMapDifferenceEmptyEmpty() {
SortedMapDifference<Integer, Integer> diff =
Maps.difference(SORTED_EMPTY, SORTED_EMPTY);
assertTrue(diff.areEqual());
assertEquals(SORTED_EMPTY, diff.entriesOnlyOnLeft());
assertEquals(SORTED_EMPTY, diff.entriesOnlyOnRight());
assertEquals(SORTED_EMPTY, diff.entriesInCommon());
assertEquals(SORTED_EMPTY, diff.entriesDiffering());
assertEquals("equal", diff.toString());
}
public void testSortedMapDifferenceEmptySingleton() {
SortedMapDifference<Integer, Integer> diff =
Maps.difference(SORTED_EMPTY, SORTED_SINGLETON);
assertFalse(diff.areEqual());
assertEquals(SORTED_EMPTY, diff.entriesOnlyOnLeft());
assertEquals(SORTED_SINGLETON, diff.entriesOnlyOnRight());
assertEquals(SORTED_EMPTY, diff.entriesInCommon());
assertEquals(SORTED_EMPTY, diff.entriesDiffering());
assertEquals("not equal: only on right={1=2}", diff.toString());
}
public void testSortedMapDifferenceSingletonEmpty() {
SortedMapDifference<Integer, Integer> diff =
Maps.difference(SORTED_SINGLETON, SORTED_EMPTY);
assertFalse(diff.areEqual());
assertEquals(SORTED_SINGLETON, diff.entriesOnlyOnLeft());
assertEquals(SORTED_EMPTY, diff.entriesOnlyOnRight());
assertEquals(SORTED_EMPTY, diff.entriesInCommon());
assertEquals(SORTED_EMPTY, diff.entriesDiffering());
assertEquals("not equal: only on left={1=2}", diff.toString());
}
public void testSortedMapDifferenceTypical() {
SortedMap<Integer, String> left =
ImmutableSortedMap.<Integer, String>reverseOrder()
.put(1, "a").put(2, "b").put(3, "c").put(4, "d").put(5, "e")
.build();
SortedMap<Integer, String> right =
ImmutableSortedMap.of(1, "a", 3, "f", 5, "g", 6, "z");
SortedMapDifference<Integer, String> diff1 =
Maps.difference(left, right);
assertFalse(diff1.areEqual());
ASSERT.that(diff1.entriesOnlyOnLeft().entrySet()).hasContentsInOrder(
Maps.immutableEntry(4, "d"), Maps.immutableEntry(2, "b"));
ASSERT.that(diff1.entriesOnlyOnRight().entrySet()).hasContentsInOrder(
Maps.immutableEntry(6, "z"));
ASSERT.that(diff1.entriesInCommon().entrySet()).hasContentsInOrder(
Maps.immutableEntry(1, "a"));
ASSERT.that(diff1.entriesDiffering().entrySet()).hasContentsInOrder(
Maps.immutableEntry(5, ValueDifferenceImpl.create("e", "g")),
Maps.immutableEntry(3, ValueDifferenceImpl.create("c", "f")));
assertEquals("not equal: only on left={4=d, 2=b}: only on right={6=z}: "
+ "value differences={5=(e, g), 3=(c, f)}", diff1.toString());
SortedMapDifference<Integer, String> diff2 =
Maps.difference(right, left);
assertFalse(diff2.areEqual());
ASSERT.that(diff2.entriesOnlyOnLeft().entrySet()).hasContentsInOrder(
Maps.immutableEntry(6, "z"));
ASSERT.that(diff2.entriesOnlyOnRight().entrySet()).hasContentsInOrder(
Maps.immutableEntry(2, "b"), Maps.immutableEntry(4, "d"));
ASSERT.that(diff1.entriesInCommon().entrySet()).hasContentsInOrder(
Maps.immutableEntry(1, "a"));
assertEquals(ImmutableMap.of(
3, ValueDifferenceImpl.create("f", "c"),
5, ValueDifferenceImpl.create("g", "e")),
diff2.entriesDiffering());
assertEquals("not equal: only on left={6=z}: only on right={2=b, 4=d}: "
+ "value differences={3=(f, c), 5=(g, e)}", diff2.toString());
}
public void testSortedMapDifferenceImmutable() {
SortedMap<Integer, String> left = Maps.newTreeMap(
ImmutableSortedMap.of(1, "a", 2, "b", 3, "c", 4, "d", 5, "e"));
SortedMap<Integer, String> right =
Maps.newTreeMap(ImmutableSortedMap.of(1, "a", 3, "f", 5, "g", 6, "z"));
SortedMapDifference<Integer, String> diff1 =
Maps.difference(left, right);
left.put(6, "z");
assertFalse(diff1.areEqual());
ASSERT.that(diff1.entriesOnlyOnLeft().entrySet()).hasContentsInOrder(
Maps.immutableEntry(2, "b"), Maps.immutableEntry(4, "d"));
ASSERT.that(diff1.entriesOnlyOnRight().entrySet()).hasContentsInOrder(
Maps.immutableEntry(6, "z"));
ASSERT.that(diff1.entriesInCommon().entrySet()).hasContentsInOrder(
Maps.immutableEntry(1, "a"));
ASSERT.that(diff1.entriesDiffering().entrySet()).hasContentsInOrder(
Maps.immutableEntry(3, ValueDifferenceImpl.create("c", "f")),
Maps.immutableEntry(5, ValueDifferenceImpl.create("e", "g")));
try {
diff1.entriesInCommon().put(7, "x");
fail();
} catch (UnsupportedOperationException expected) {
}
try {
diff1.entriesOnlyOnLeft().put(7, "x");
fail();
} catch (UnsupportedOperationException expected) {
}
try {
diff1.entriesOnlyOnRight().put(7, "x");
fail();
} catch (UnsupportedOperationException expected) {
}
}
public void testSortedMapDifferenceEquals() {
SortedMap<Integer, String> left =
ImmutableSortedMap.of(1, "a", 2, "b", 3, "c", 4, "d", 5, "e");
SortedMap<Integer, String> right =
ImmutableSortedMap.of(1, "a", 3, "f", 5, "g", 6, "z");
SortedMap<Integer, String> right2 =
ImmutableSortedMap.of(1, "a", 3, "h", 5, "g", 6, "z");
SortedMapDifference<Integer, String> original =
Maps.difference(left, right);
SortedMapDifference<Integer, String> same =
Maps.difference(left, right);
SortedMapDifference<Integer, String> reverse =
Maps.difference(right, left);
SortedMapDifference<Integer, String> diff2 =
Maps.difference(left, right2);
new EqualsTester()
.addEqualityGroup(original, same)
.addEqualityGroup(reverse)
.addEqualityGroup(diff2)
.testEquals();
}
private static final BiMap<Integer, String> INT_TO_STRING_MAP =
new ImmutableBiMap.Builder<Integer, String>()
.put(1, "one")
.put(2, "two")
.put(3, "three")
.build();
public void testUniqueIndexCollection() {
ImmutableMap<Integer, String> outputMap =
Maps.uniqueIndex(INT_TO_STRING_MAP.values(),
Functions.forMap(INT_TO_STRING_MAP.inverse()));
assertEquals(INT_TO_STRING_MAP, outputMap);
}
public void testUniqueIndexIterable() {
ImmutableMap<Integer, String> outputMap =
Maps.uniqueIndex(new Iterable<String>() {
@Override
public Iterator<String> iterator() {
return INT_TO_STRING_MAP.values().iterator();
}
},
Functions.forMap(INT_TO_STRING_MAP.inverse()));
assertEquals(INT_TO_STRING_MAP, outputMap);
}
public void testUniqueIndexIterator() {
ImmutableMap<Integer, String> outputMap =
Maps.uniqueIndex(INT_TO_STRING_MAP.values().iterator(),
Functions.forMap(INT_TO_STRING_MAP.inverse()));
assertEquals(INT_TO_STRING_MAP, outputMap);
}
/** Can't create the map if more than one value maps to the same key. */
public void testUniqueIndexDuplicates() {
try {
Maps.uniqueIndex(ImmutableSet.of("one", "uno"), Functions.constant(1));
fail();
} catch (IllegalArgumentException expected) {
}
}
/** Null values are not allowed. */
public void testUniqueIndexNullValue() {
List<String> listWithNull = Lists.newArrayList((String) null);
try {
Maps.uniqueIndex(listWithNull, Functions.constant(1));
fail();
} catch (NullPointerException expected) {
}
}
/** Null keys aren't allowed either. */
public void testUniqueIndexNullKey() {
List<String> oneStringList = Lists.newArrayList("foo");
try {
Maps.uniqueIndex(oneStringList, Functions.constant(null));
fail();
} catch (NullPointerException expected) {
}
}
@GwtIncompatible("Maps.fromProperties")
@SuppressWarnings("deprecation") // StringBufferInputStream
public void testFromProperties() throws IOException {
Properties testProp = new Properties();
Map<String, String> result = Maps.fromProperties(testProp);
assertTrue(result.isEmpty());
testProp.setProperty("first", "true");
result = Maps.fromProperties(testProp);
assertEquals("true", result.get("first"));
assertEquals(1, result.size());
testProp.setProperty("second", "null");
result = Maps.fromProperties(testProp);
assertEquals("true", result.get("first"));
assertEquals("null", result.get("second"));
assertEquals(2, result.size());
// Now test values loaded from a stream.
String props = "test\n second = 2\n Third item : a short phrase ";
// TODO: change to StringReader in Java 1.6
testProp.load(new java.io.StringBufferInputStream(props));
result = Maps.fromProperties(testProp);
assertEquals(4, result.size());
assertEquals("true", result.get("first"));
assertEquals("", result.get("test"));
assertEquals("2", result.get("second"));
assertEquals("item : a short phrase ", result.get("Third"));
assertFalse(result.containsKey("not here"));
// Test loading system properties
result = Maps.fromProperties(System.getProperties());
assertTrue(result.containsKey("java.version"));
// Test that defaults work, too.
testProp = new Properties(System.getProperties());
String override = "test\njava.version : hidden";
// TODO: change to StringReader in Java 1.6
testProp.load(new java.io.StringBufferInputStream(override));
result = Maps.fromProperties(testProp);
assertTrue(result.size() > 2);
assertEquals("", result.get("test"));
assertEquals("hidden", result.get("java.version"));
assertNotSame(System.getProperty("java.version"),
result.get("java.version"));
}
@GwtIncompatible("Maps.fromProperties")
@SuppressWarnings("serial") // never serialized
public void testFromPropertiesNullKey() {
Properties properties = new Properties() {
@Override public Enumeration<?> propertyNames() {
return Iterators.asEnumeration(
Arrays.asList(null, "first", "second").iterator());
}
};
properties.setProperty("first", "true");
properties.setProperty("second", "null");
try {
Maps.fromProperties(properties);
fail();
} catch (NullPointerException expected) {}
}
@GwtIncompatible("Maps.fromProperties")
@SuppressWarnings("serial") // never serialized
public void testFromPropertiesNonStringKeys() {
Properties properties = new Properties() {
@Override public Enumeration<?> propertyNames() {
return Iterators.asEnumeration(
Arrays.<Object>asList(Integer.valueOf(123), "first").iterator());
}
};
try {
Maps.fromProperties(properties);
fail();
} catch (ClassCastException expected) {}
}
/**
* Constructs a "nefarious" map entry with the specified key and value,
* meaning an entry that is suitable for testing that map entries cannot be
* modified via a nefarious implementation of equals. This is used for testing
* unmodifiable collections of map entries; for example, it should not be
* possible to access the raw (modifiable) map entry via a nefarious equals
* method.
*/
public static <K, V> Map.Entry<K, V> nefariousEntry(
final K key, final V value) {
return new AbstractMapEntry<K, V>() {
@Override public K getKey() {
return key;
}
@Override public V getValue() {
return value;
}
@Override public V setValue(V value) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override public boolean equals(Object o) {
if (o instanceof Map.Entry<?, ?>) {
Map.Entry<K, V> e = (Map.Entry<K, V>) o;
e.setValue(value); // muhahaha!
}
return super.equals(o);
}
};
}
public void testUnmodifiableBiMap() {
BiMap<Integer, String> mod = HashBiMap.create();
mod.put(1, "one");
mod.put(2, "two");
mod.put(3, "three");
BiMap<Number, String> unmod = Maps.<Number, String>unmodifiableBiMap(mod);
/* No aliasing on inverse operations. */
assertSame(unmod.inverse(), unmod.inverse());
assertSame(unmod, unmod.inverse().inverse());
/* Unmodifiable is a view. */
mod.put(4, "four");
assertEquals(true, unmod.get(4).equals("four"));
assertEquals(true, unmod.inverse().get("four").equals(4));
/* UnsupportedOperationException on direct modifications. */
try {
unmod.put(4, "four");
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
try {
unmod.forcePut(4, "four");
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
try {
unmod.putAll(Collections.singletonMap(4, "four"));
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
/* UnsupportedOperationException on indirect modifications. */
BiMap<String, Number> inverse = unmod.inverse();
try {
inverse.put("four", 4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
try {
inverse.forcePut("four", 4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
try {
inverse.putAll(Collections.singletonMap("four", 4));
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
Set<String> values = unmod.values();
try {
values.remove("four");
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
Set<Map.Entry<Number, String>> entries = unmod.entrySet();
Map.Entry<Number, String> entry = entries.iterator().next();
try {
entry.setValue("four");
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
@SuppressWarnings("unchecked")
Map.Entry<Integer, String> entry2
= (Map.Entry<Integer, String>) entries.toArray()[0];
try {
entry2.setValue("four");
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
}
public void testBiMapEntrySetIteratorRemove() {
BiMap<Integer, String> map = HashBiMap.create();
map.put(1, "one");
Set<Map.Entry<Integer, String>> entries = map.entrySet();
Iterator<Map.Entry<Integer, String>> iterator = entries.iterator();
Map.Entry<Integer, String> entry = iterator.next();
entry.setValue("two"); // changes the iterator's current entry value
assertEquals("two", map.get(1));
iterator.remove(); // removes the updated entry
assertTrue(map.isEmpty());
}
public void testImmutableEntry() {
Map.Entry<String, Integer> e = Maps.immutableEntry("foo", 1);
assertEquals("foo", e.getKey());
assertEquals(1, (int) e.getValue());
try {
e.setValue(2);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
assertEquals("foo=1", e.toString());
assertEquals(101575, e.hashCode());
}
public void testImmutableEntryNull() {
Map.Entry<String, Integer> e
= Maps.immutableEntry((String) null, (Integer) null);
assertNull(e.getKey());
assertNull(e.getValue());
try {
e.setValue(null);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {}
assertEquals("null=null", e.toString());
assertEquals(0, e.hashCode());
}
/** See {@link SynchronizedBiMapTest} for more tests. */
public void testSynchronizedBiMap() {
BiMap<String, Integer> bimap = HashBiMap.create();
bimap.put("one", 1);
BiMap<String, Integer> sync = Maps.synchronizedBiMap(bimap);
bimap.put("two", 2);
sync.put("three", 3);
assertEquals(ImmutableSet.of(1, 2, 3), bimap.inverse().keySet());
assertEquals(ImmutableSet.of(1, 2, 3), sync.inverse().keySet());
}
private static final Predicate<String> NOT_LENGTH_3
= new Predicate<String>() {
@Override
public boolean apply(String input) {
return input == null || input.length() != 3;
}
};
private static final Predicate<Integer> EVEN
= new Predicate<Integer>() {
@Override
public boolean apply(Integer input) {
return input == null || input % 2 == 0;
}
};
private static final Predicate<Entry<String, Integer>> CORRECT_LENGTH
= new Predicate<Entry<String, Integer>>() {
@Override
public boolean apply(Entry<String, Integer> input) {
return input.getKey().length() == input.getValue();
}
};
public void testFilteredKeysIllegalPut() {
Map<String, Integer> unfiltered = Maps.newHashMap();
Map<String, Integer> filtered = Maps.filterKeys(unfiltered, NOT_LENGTH_3);
filtered.put("a", 1);
filtered.put("b", 2);
assertEquals(ImmutableMap.of("a", 1, "b", 2), filtered);
try {
filtered.put("yyy", 3);
fail();
} catch (IllegalArgumentException expected) {}
try {
filtered.putAll(ImmutableMap.of("c", 3, "zzz", 4, "b", 5));
fail();
} catch (IllegalArgumentException expected) {}
assertEquals(ImmutableMap.of("a", 1, "b", 2), filtered);
}
public void testFilteredKeysChangeFiltered() {
Map<String, Integer> unfiltered = Maps.newHashMap();
Map<String, Integer> filtered = Maps.filterKeys(unfiltered, NOT_LENGTH_3);
unfiltered.put("two", 2);
unfiltered.put("three", 3);
unfiltered.put("four", 4);
assertEquals(ImmutableMap.of("two", 2, "three", 3, "four", 4), unfiltered);
assertEquals(ImmutableMap.of("three", 3, "four", 4), filtered);
unfiltered.remove("three");
assertEquals(ImmutableMap.of("two", 2, "four", 4), unfiltered);
assertEquals(ImmutableMap.of("four", 4), filtered);
unfiltered.clear();
assertEquals(ImmutableMap.of(), unfiltered);
assertEquals(ImmutableMap.of(), filtered);
}
public void testFilteredKeysChangeUnfiltered() {
Map<String, Integer> unfiltered = Maps.newHashMap();
Map<String, Integer> filtered = Maps.filterKeys(unfiltered, NOT_LENGTH_3);
unfiltered.put("two", 2);
unfiltered.put("three", 3);
unfiltered.put("four", 4);
assertEquals(ImmutableMap.of("two", 2, "three", 3, "four", 4), unfiltered);
assertEquals(ImmutableMap.of("three", 3, "four", 4), filtered);
filtered.remove("three");
assertEquals(ImmutableMap.of("two", 2, "four", 4), unfiltered);
assertEquals(ImmutableMap.of("four", 4), filtered);
filtered.clear();
assertEquals(ImmutableMap.of("two", 2), unfiltered);
assertEquals(ImmutableMap.of(), filtered);
}
public void testFilteredValuesIllegalPut() {
Map<String, Integer> unfiltered = Maps.newHashMap();
Map<String, Integer> filtered = Maps.filterValues(unfiltered, EVEN);
filtered.put("a", 2);
unfiltered.put("b", 4);
unfiltered.put("c", 5);
assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);
try {
filtered.put("yyy", 3);
fail();
} catch (IllegalArgumentException expected) {}
try {
filtered.putAll(ImmutableMap.of("c", 4, "zzz", 5, "b", 6));
fail();
} catch (IllegalArgumentException expected) {}
assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);
}
public void testFilteredValuesIllegalSetValue() {
Map<String, Integer> unfiltered = Maps.newHashMap();
Map<String, Integer> filtered = Maps.filterValues(unfiltered, EVEN);
filtered.put("a", 2);
filtered.put("b", 4);
assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);
Entry<String, Integer> entry = filtered.entrySet().iterator().next();
try {
entry.setValue(5);
fail();
} catch (IllegalArgumentException expected) {}
assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);
}
public void testFilteredValuesClear() {
Map<String, Integer> unfiltered = Maps.newHashMap();
unfiltered.put("one", 1);
unfiltered.put("two", 2);
unfiltered.put("three", 3);
unfiltered.put("four", 4);
Map<String, Integer> filtered = Maps.filterValues(unfiltered, EVEN);
assertEquals(ImmutableMap.of("one", 1, "two", 2, "three", 3, "four", 4),
unfiltered);
assertEquals(ImmutableMap.of("two", 2, "four", 4), filtered);
filtered.clear();
assertEquals(ImmutableMap.of("one", 1, "three", 3), unfiltered);
assertTrue(filtered.isEmpty());
}
public void testFilteredEntriesIllegalPut() {
Map<String, Integer> unfiltered = Maps.newHashMap();
unfiltered.put("cat", 3);
unfiltered.put("dog", 2);
unfiltered.put("horse", 5);
Map<String, Integer> filtered
= Maps.filterEntries(unfiltered, CORRECT_LENGTH);
assertEquals(ImmutableMap.of("cat", 3, "horse", 5), filtered);
filtered.put("chicken", 7);
assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
try {
filtered.put("cow", 7);
fail();
} catch (IllegalArgumentException expected) {}
assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
try {
filtered.putAll(ImmutableMap.of("sheep", 5, "cow", 7));
fail();
} catch (IllegalArgumentException expected) {}
assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
}
public void testFilteredEntriesObjectPredicate() {
Map<String, Integer> unfiltered = Maps.newHashMap();
unfiltered.put("cat", 3);
unfiltered.put("dog", 2);
unfiltered.put("horse", 5);
Predicate<Object> predicate = Predicates.alwaysFalse();
Map<String, Integer> filtered
= Maps.filterEntries(unfiltered, predicate);
assertTrue(filtered.isEmpty());
}
public void testFilteredEntriesWildCardEntryPredicate() {
Map<String, Integer> unfiltered = Maps.newHashMap();
unfiltered.put("cat", 3);
unfiltered.put("dog", 2);
unfiltered.put("horse", 5);
Predicate<Entry<?, ?>> predicate = new Predicate<Entry<?, ?>>() {
@Override
public boolean apply(Entry<?, ?> input) {
return "cat".equals(input.getKey())
|| Integer.valueOf(2) == input.getValue();
}
};
Map<String, Integer> filtered
= Maps.filterEntries(unfiltered, predicate);
assertEquals(ImmutableMap.of("cat", 3, "dog", 2), filtered);
}
public void testTransformValues() {
Map<String, Integer> map = ImmutableMap.of("a", 4, "b", 9);
Function<Integer, Double> sqrt = new Function<Integer, Double>() {
@Override
public Double apply(Integer in) {
return Math.sqrt(in);
}
};
Map<String, Double> transformed = Maps.transformValues(map, sqrt);
assertEquals(ImmutableMap.of("a", 2.0, "b", 3.0), transformed);
}
public void testTransformValuesSecretlySorted() {
Map<String, Integer> map = ImmutableSortedMap.of("a", 4, "b", 9);
Function<Integer, Double> sqrt = new Function<Integer, Double>() {
@Override
public Double apply(Integer in) {
return Math.sqrt(in);
}
};
Map<String, Double> transformed = Maps.transformValues(map, sqrt);
assertEquals(ImmutableMap.of("a", 2.0, "b", 3.0), transformed);
assertTrue(transformed instanceof SortedMap);
}
public void testTransformEntries() {
Map<String, String> map = ImmutableMap.of("a", "4", "b", "9");
EntryTransformer<String, String, String> concat =
new EntryTransformer<String, String, String>() {
@Override
public String transformEntry(String key, String value) {
return key + value;
}
};
Map<String, String> transformed = Maps.transformEntries(map, concat);
assertEquals(ImmutableMap.of("a", "a4", "b", "b9"), transformed);
}
public void testTransformEntriesSecretlySorted() {
Map<String, String> map = ImmutableSortedMap.of("a", "4", "b", "9");
EntryTransformer<String, String, String> concat =
new EntryTransformer<String, String, String>() {
@Override
public String transformEntry(String key, String value) {
return key + value;
}
};
Map<String, String> transformed = Maps.transformEntries(map, concat);
assertEquals(ImmutableMap.of("a", "a4", "b", "b9"), transformed);
assertTrue(transformed instanceof SortedMap);
}
public void testTransformEntriesGenerics() {
Map<Object, Object> map1 = ImmutableMap.<Object, Object>of(1, 2);
Map<Object, Number> map2 = ImmutableMap.<Object, Number>of(1, 2);
Map<Object, Integer> map3 = ImmutableMap.<Object, Integer>of(1, 2);
Map<Number, Object> map4 = ImmutableMap.<Number, Object>of(1, 2);
Map<Number, Number> map5 = ImmutableMap.<Number, Number>of(1, 2);
Map<Number, Integer> map6 = ImmutableMap.<Number, Integer>of(1, 2);
Map<Integer, Object> map7 = ImmutableMap.<Integer, Object>of(1, 2);
Map<Integer, Number> map8 = ImmutableMap.<Integer, Number>of(1, 2);
Map<Integer, Integer> map9 = ImmutableMap.<Integer, Integer>of(1, 2);
Map<? extends Number, ? extends Number> map0 = ImmutableMap.of(1, 2);
EntryTransformer<Number, Number, Double> transformer =
new EntryTransformer<Number, Number, Double>() {
@Override
public Double transformEntry(Number key, Number value) {
return key.doubleValue() + value.doubleValue();
}
};
Map<Object, Double> objectKeyed;
Map<Number, Double> numberKeyed;
Map<Integer, Double> integerKeyed;
numberKeyed = transformEntries(map5, transformer);
numberKeyed = transformEntries(map6, transformer);
integerKeyed = transformEntries(map8, transformer);
integerKeyed = transformEntries(map9, transformer);
Map<? extends Number, Double> wildcarded = transformEntries(map0, transformer);
// Can't loosen the key type:
// objectKeyed = transformEntries(map5, transformer);
// objectKeyed = transformEntries(map6, transformer);
// objectKeyed = transformEntries(map8, transformer);
// objectKeyed = transformEntries(map9, transformer);
// numberKeyed = transformEntries(map8, transformer);
// numberKeyed = transformEntries(map9, transformer);
// Can't loosen the value type:
// Map<Number, Number> looseValued1 = transformEntries(map5, transformer);
// Map<Number, Number> looseValued2 = transformEntries(map6, transformer);
// Map<Integer, Number> looseValued3 = transformEntries(map8, transformer);
// Map<Integer, Number> looseValued4 = transformEntries(map9, transformer);
// Can't call with too loose a key:
// transformEntries(map1, transformer);
// transformEntries(map2, transformer);
// transformEntries(map3, transformer);
// Can't call with too loose a value:
// transformEntries(map1, transformer);
// transformEntries(map4, transformer);
// transformEntries(map7, transformer);
}
public void testTransformEntriesExample() {
Map<String, Boolean> options =
ImmutableMap.of("verbose", true, "sort", false);
EntryTransformer<String, Boolean, String> flagPrefixer =
new EntryTransformer<String, Boolean, String>() {
@Override
public String transformEntry(String key, Boolean value) {
return value ? key : "no" + key;
}
};
Map<String, String> transformed =
Maps.transformEntries(options, flagPrefixer);
assertEquals("{verbose=verbose, sort=nosort}", transformed.toString());
}
// TestStringMapGenerator uses entries of the form "one=January" and so forth.
// To test the filtered collections, we'll create a map containing the entries
// they ask for, plus some bogus numeric entries. Then our predicates will
// simply filter numeric entries back out.
private static ImmutableMap<String, String> ENTRIES_TO_FILTER_OUT =
new ImmutableMap.Builder<String, String>()
.put("0", "0")
.put("1", "1")
.put("2", "2")
.build();
@GwtIncompatible("suite")
public static class FilteredMapTests 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 = Maps.newHashMap();
for (Entry<String, String> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
map.putAll(ENTRIES_TO_FILTER_OUT);
return Maps.filterKeys(map, new Predicate<String>() {
@Override
public boolean apply(String input) {
return input == null
|| (input.charAt(0) >= 'a' && input.charAt(0) <= 'z');
}
});
}
})
.named("Maps.filterKeys")
.withFeatures(
CollectionSize.ANY,
MapFeature.ALLOWS_NULL_KEYS,
MapFeature.ALLOWS_NULL_VALUES,
MapFeature.GENERAL_PURPOSE)
.suppressing(getIteratorUnknownOrderRemoveSupportedMethod())
.createTestSuite());
suite.addTest(MapTestSuiteBuilder.using(
new TestStringMapGenerator() {
@Override protected Map<String, String> create(
Entry<String, String>[] entries) {
Map<String, String> map = Maps.newHashMap();
for (Entry<String, String> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
map.putAll(ENTRIES_TO_FILTER_OUT);
return Maps.filterValues(map, new Predicate<String>() {
@Override
public boolean apply(String input) {
return input == null
|| (input.charAt(0) >= 'A' && input.charAt(0) <= 'Z');
}
});
}
})
.named("Maps.filterValues")
.withFeatures(
CollectionSize.ANY,
MapFeature.ALLOWS_NULL_KEYS,
MapFeature.ALLOWS_NULL_VALUES,
MapFeature.GENERAL_PURPOSE)
.suppressing(getIteratorUnknownOrderRemoveSupportedMethod())
.createTestSuite());
suite.addTest(MapTestSuiteBuilder.using(
new TestStringMapGenerator() {
@Override protected Map<String, String> create(
Entry<String, String>[] entries) {
Map<String, String> map = Maps.newHashMap();
for (Entry<String, String> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
map.putAll(ENTRIES_TO_FILTER_OUT);
return Maps.filterEntries(map,
new Predicate<Entry<String, String>>() {
@Override
public boolean apply(Entry<String, String> entry) {
String input = entry.getKey();
return input == null
|| (input.charAt(0) >= 'a' && input.charAt(0) <= 'z');
}
});
}
})
.named("Maps.filterEntries")
.withFeatures(
CollectionSize.ANY,
MapFeature.ALLOWS_NULL_KEYS,
MapFeature.ALLOWS_NULL_VALUES,
MapFeature.GENERAL_PURPOSE)
.suppressing(getIteratorUnknownOrderRemoveSupportedMethod())
.createTestSuite());
suite.addTest(MapTestSuiteBuilder.using(
new TestStringMapGenerator() {
@Override protected Map<String, String> create(
Entry<String, String>[] entries) {
Map<String, String> map = Maps.newHashMap();
for (Entry<String, String> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
map.putAll(ENTRIES_TO_FILTER_OUT);
map.put("", "weird");
Map<String, String> withoutEmptyKey = Maps.filterKeys(map,
new Predicate<String>() {
@Override
public boolean apply(String input) {
return input == null || input.length() != 0;
}
});
return Maps.filterKeys(withoutEmptyKey, new Predicate<String>() {
@Override
public boolean apply(String input) {
return input == null
|| (input.charAt(0) >= 'a' && input.charAt(0) <= 'z');
}
});
// note: these filters were deliberately chosen so that an
// element somehow getting around the first filter would cause
// an exception in the second
}
})
.named("Maps.filterKeys, chained")
.withFeatures(
CollectionSize.ANY,
MapFeature.ALLOWS_NULL_KEYS,
MapFeature.ALLOWS_NULL_VALUES,
MapFeature.GENERAL_PURPOSE)
.suppressing(getIteratorUnknownOrderRemoveSupportedMethod())
.createTestSuite());
return suite;
}
}
public void testSortedMapTransformValues() {
SortedMap<String, Integer> map = ImmutableSortedMap.of("a", 4, "b", 9);
Function<Integer, Double> sqrt = new Function<Integer, Double>() {
@Override
public Double apply(Integer in) {
return Math.sqrt(in);
}
};
SortedMap<String, Double> transformed =
Maps.transformValues(map, sqrt);
assertEquals(ImmutableSortedMap.of("a", 2.0, "b", 3.0), transformed);
}
public void testSortedMapTransformEntries() {
SortedMap<String, String> map = ImmutableSortedMap.of("a", "4", "b", "9");
EntryTransformer<String, String, String> concat =
new EntryTransformer<String, String, String>() {
@Override
public String transformEntry(String key, String value) {
return key + value;
}
};
SortedMap<String, String> transformed =
Maps.transformEntries(map, concat);
assertEquals(ImmutableSortedMap.of("a", "a4", "b", "b9"), transformed);
}
/*
* Not testing Map methods of Maps.filter*(SortedMap), since the
* implementation doesn't override Maps.FilteredEntryMap, which is already
* tested.
*/
public void testSortedMapFilterKeys() {
Comparator<Integer> comparator = Ordering.natural();
SortedMap<Integer, String> unfiltered = Maps.newTreeMap(comparator);
unfiltered.put(1, "one");
unfiltered.put(2, "two");
unfiltered.put(3, "three");
unfiltered.put(4, "four");
unfiltered.put(5, "five");
unfiltered.put(6, "six");
unfiltered.put(7, "seven");
SortedMap<Integer, String> filtered
= Maps.filterKeys(unfiltered, EVEN);
ASSERT.that(filtered.keySet()).hasContentsInOrder(2, 4, 6);
assertSame(comparator, filtered.comparator());
assertEquals((Integer) 2, filtered.firstKey());
assertEquals((Integer) 6, filtered.lastKey());
ASSERT.that(filtered.headMap(5).keySet()).hasContentsInOrder(2, 4);
ASSERT.that(filtered.tailMap(3).keySet()).hasContentsInOrder(4, 6);
ASSERT.that(filtered.subMap(3, 5).keySet()).hasContentsInOrder(4);
}
public void testSortedMapFilterValues() {
Comparator<Integer> comparator = Ordering.natural();
SortedMap<Integer, String> unfiltered = Maps.newTreeMap(comparator);
unfiltered.put(1, "one");
unfiltered.put(2, "two");
unfiltered.put(3, "three");
unfiltered.put(4, "four");
unfiltered.put(5, "five");
unfiltered.put(6, "six");
unfiltered.put(7, "seven");
SortedMap<Integer, String> filtered
= Maps.filterValues(unfiltered, NOT_LENGTH_3);
ASSERT.that(filtered.keySet()).hasContentsInOrder(3, 4, 5, 7);
assertSame(comparator, filtered.comparator());
assertEquals((Integer) 3, filtered.firstKey());
assertEquals((Integer) 7, filtered.lastKey());
ASSERT.that(filtered.headMap(5).keySet()).hasContentsInOrder(3, 4);
ASSERT.that(filtered.tailMap(4).keySet()).hasContentsInOrder(4, 5, 7);
ASSERT.that(filtered.subMap(4, 6).keySet()).hasContentsInOrder(4, 5);
}
private static final Predicate<Map.Entry<Integer, String>>
EVEN_AND_LENGTH_3 = new Predicate<Map.Entry<Integer, String>>() {
@Override public boolean apply(Entry<Integer, String> entry) {
return (entry.getKey() == null || entry.getKey() % 2 == 0)
&& (entry.getValue() == null || entry.getValue().length() == 3);
}
};
private static class ContainsKeySafeSortedMap
extends ForwardingSortedMap<Integer, String> {
SortedMap<Integer, String> delegate
= Maps.newTreeMap(Ordering.natural().nullsFirst());
@Override protected SortedMap<Integer, String> delegate() {
return delegate;
}
// Needed by MapInterfaceTest.testContainsKey()
@Override public boolean containsKey(Object key) {
try {
return super.containsKey(key);
} catch (ClassCastException e) {
return false;
}
}
}
public static class FilteredEntriesSortedMapInterfaceTest
extends SortedMapInterfaceTest<Integer, String> {
public FilteredEntriesSortedMapInterfaceTest() {
super(true, true, true, true, true);
}
@Override protected SortedMap<Integer, String> makeEmptyMap() {
SortedMap<Integer, String> unfiltered = new ContainsKeySafeSortedMap();
unfiltered.put(1, "one");
unfiltered.put(3, "three");
unfiltered.put(4, "four");
unfiltered.put(5, "five");
return Maps.filterEntries(unfiltered, EVEN_AND_LENGTH_3);
}
@Override protected SortedMap<Integer, String> makePopulatedMap() {
SortedMap<Integer, String> unfiltered = new ContainsKeySafeSortedMap();
unfiltered.put(1, "one");
unfiltered.put(2, "two");
unfiltered.put(3, "three");
unfiltered.put(4, "four");
unfiltered.put(5, "five");
unfiltered.put(6, "six");
return Maps.filterEntries(unfiltered, EVEN_AND_LENGTH_3);
}
@Override protected Integer getKeyNotInPopulatedMap() {
return 10;
}
@Override protected String getValueNotInPopulatedMap() {
return "ten";
}
// Iterators don't support remove.
@Override public void testEntrySetIteratorRemove() {}
@Override public void testValuesIteratorRemove() {}
// These tests fail on GWT.
// TODO: Investigate why.
@Override public void testEntrySetRemoveAll() {}
@Override public void testEntrySetRetainAll() {}
}
}