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guava functional work

This commit is contained in:
Eugen Paraschiv 2013-10-30 17:42:47 +02:00
parent 625f4e126d
commit cf73a09b62
2 changed files with 38 additions and 21 deletions
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13
guava/src/test/java/org/baeldung/guava/GuavaCollectionsExamplesTest.java
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@ -4,6 +4,7 @@ import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
@ -173,4 +174,16 @@ public class GuavaCollectionsExamplesTest {
final ImmutableMap<String, String> imuttableMap = ImmutableMap.<String, String> builder().putAll(muttableMap).build();
}
// unmodifiable
@Test(expected = UnsupportedOperationException.class)
public final void givenUnmodifiableViewOverIterable_whenTryingToRemove_thenNotAllowed() {
final List<Integer> numbers = Lists.newArrayList(1, 2, 3);
final Iterable<Integer> unmodifiableIterable = Iterables.unmodifiableIterable(numbers);
final Iterator<Integer> iterator = unmodifiableIterable.iterator();
if (iterator.hasNext()) {
iterator.remove();
}
}
}

46
guava/src/test/java/org/baeldung/guava/GuavaFunctionalExamplesTest.java
View File

@ -8,7 +8,6 @@ import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
@ -35,14 +34,14 @@ public class GuavaFunctionalExamplesTest {
@Test
public final void whenFilteringNumbersAccordingToACondition_thenCorrectResults() {
final List<Integer> randomNumbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89);
final List<Integer> numbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89);
final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
@Override
public final boolean apply(final Integer number) {
return (number % 2) == 0;
}
};
final List<Integer> evenNumbers = Lists.newArrayList(Collections2.filter(randomNumbers, acceptEvenNumber));
final List<Integer> evenNumbers = Lists.newArrayList(Collections2.filter(numbers, acceptEvenNumber));
final Integer found = Collections.binarySearch(evenNumbers, 57);
assertThat(found, lessThan(0));
@ -50,10 +49,10 @@ public class GuavaFunctionalExamplesTest {
@Test
public final void givenCollectionContainsNulls_whenNullsAreFilteredOut_thenResultingCollectionsHasNoNulls() {
final List<String> collectionOfStringsWithNulls = Lists.newArrayList("a", "bc", null, "def", null, null, "ghij");
final Iterable<String> collectionWithoutNulls = Iterables.filter(collectionOfStringsWithNulls, Predicates.notNull());
final List<String> withNulls = Lists.newArrayList("a", "bc", null, "def");
final Iterable<String> withoutNuls = Iterables.filter(withNulls, Predicates.notNull());
assertTrue(Iterables.all(collectionWithoutNulls, Predicates.notNull()));
assertTrue(Iterables.all(withoutNuls, Predicates.notNull()));
}
// predicates - checking
@ -86,18 +85,6 @@ public class GuavaFunctionalExamplesTest {
assertTrue(Iterables.all(evenNumbers, Predicates.not(acceptOddNumber)));
}
// try - 1
@Test(expected = UnsupportedOperationException.class)
public final void givenUnmodifiableViewOverIterable_whenTryingToRemove_thenNotAllowed() {
final List<Integer> numbers = Lists.newArrayList(1, 2, 3);
final Iterable<Integer> unmodifiableIterable = Iterables.unmodifiableIterable(numbers);
final Iterator<Integer> iterator = unmodifiableIterable.iterator();
if (iterator.hasNext()) {
iterator.remove();
}
}
// other predicates
@Test
@ -118,10 +105,10 @@ public class GuavaFunctionalExamplesTest {
public final void whenUsingAnIntermediaryFunctionToOrder_thenCorerctlyOrderedInAlphabeticalOrder() {
final List<Integer> numbersToSort = Arrays.asList(2, 1, 11, 100, 8, 14);
final Ordering<Object> ordering = Ordering.natural().onResultOf(Functions.toStringFunction());
final List<Integer> alphabeticalOrderingOfNumbers = ordering.sortedCopy(numbersToSort);
final List<Integer> inAlphabeticalOrder = ordering.sortedCopy(numbersToSort);
final List<Integer> expectedAlphabeticalOrderingOfNumbers = Lists.newArrayList(1, 100, 11, 14, 2, 8);
assertThat(expectedAlphabeticalOrderingOfNumbers, equalTo(alphabeticalOrderingOfNumbers));
final List<Integer> correctAlphabeticalOrder = Lists.newArrayList(1, 100, 11, 14, 2, 8);
assertThat(correctAlphabeticalOrder, equalTo(inAlphabeticalOrder));
}
@Test
@ -179,4 +166,21 @@ public class GuavaFunctionalExamplesTest {
assertThat(numberToPowerOfTwoImuttable.get(2), equalTo(4));
}
// Predicate => Function
@Test
public final void whenConvertingPredicateToFunction_thenCorrect() {
final List<Integer> numbers = Lists.newArrayList(1, 2, 3, 6);
final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
@Override
public final boolean apply(final Integer number) {
return (number % 2) == 0;
}
};
final Function<Integer, Boolean> isEventNumberFunction = Functions.forPredicate(acceptEvenNumber);
final List<Boolean> areNumbersEven = Lists.transform(numbers, isEventNumberFunction);
assertThat(areNumbersEven, contains(false, true, false, true));
}
}