functional work
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package org.baeldung.guava;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.lessThan;
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import static org.junit.Assert.assertThat;
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import static org.junit.Assert.assertTrue;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.junit.Test;
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import com.google.common.base.Function;
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import com.google.common.base.Predicate;
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import com.google.common.collect.Collections2;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Maps;
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import com.google.common.collect.Sets;
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public class GuavaFunctionalExamplesTest {
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@ -19,7 +27,7 @@ public class GuavaFunctionalExamplesTest {
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// predicates
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@Test
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public final void whenFilteringStringsAccordingToACondition_thenCorrectResults() {
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public final void whenFilteringNumbersAccordingToACondition_thenCorrectResults() {
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final List<Integer> randomNumbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89);
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final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
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@Override
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assertThat(found, lessThan(0));
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}
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@Test
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public final void givenEvenNumbers_whenCheckingIfAllSatisfyTheEvenPredicate_thenYes() {
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final List<Integer> eventNumbers = Lists.newArrayList(2, 6, 8, 10, 34, 90);
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final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
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@Override
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public final boolean apply(final Integer number) {
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return (number % 2) == 0;
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}
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};
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assertTrue(Iterables.all(eventNumbers, acceptEvenNumber));
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}
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// Set+Function => Map
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/**
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* - see: http://code.google.com/p/guava-libraries/issues/detail?id=56
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*/
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@Test
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public final void whenMapIsBackedBySetAndFunction_thenCorrect() {
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final Function<Integer, Integer> powerOfTwo = new Function<Integer, Integer>() {
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@Override
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public final Integer apply(final Integer input) {
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return (int) Math.pow(input, 2);
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}
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};
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final Set<Integer> lowNumbers = Sets.newHashSet(2, 3, 4);
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final Map<Integer, Integer> numberToPowerOfTwoMuttable = Maps.asMap(lowNumbers, powerOfTwo);
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final Map<Integer, Integer> numberToPowerOfTwoImuttable = Maps.toMap(lowNumbers, powerOfTwo);
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assertThat(numberToPowerOfTwoMuttable.get(2), equalTo(4));
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assertThat(numberToPowerOfTwoImuttable.get(2), equalTo(4));
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}
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}
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