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functional work

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This commit is contained in:
Eugen Paraschiv 2013-10-30 11:56:07 +02:00
parent 79d7313680
commit 6af58dce94
1 changed files with 43 additions and 1 deletions
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44
guava/src/test/java/org/baeldung/guava/GuavaFunctionalExamplesTest.java
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@ -1,16 +1,24 @@
package org.baeldung.guava; package org.baeldung.guava;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.lessThan; import static org.hamcrest.Matchers.lessThan;
import static org.junit.Assert.assertThat; import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import java.util.Collections; import java.util.Collections;
import java.util.List; import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Test; import org.junit.Test;
import com.google.common.base.Function;
import com.google.common.base.Predicate; import com.google.common.base.Predicate;
import com.google.common.collect.Collections2; import com.google.common.collect.Collections2;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists; import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
public class GuavaFunctionalExamplesTest { public class GuavaFunctionalExamplesTest {
@ -19,7 +27,7 @@ public class GuavaFunctionalExamplesTest {
// predicates // predicates
@Test @Test
public final void whenFilteringStringsAccordingToACondition_thenCorrectResults() { public final void whenFilteringNumbersAccordingToACondition_thenCorrectResults() {
final List<Integer> randomNumbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89); final List<Integer> randomNumbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89);
final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() { final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
@Override @Override
@ -33,4 +41,38 @@ public class GuavaFunctionalExamplesTest {
assertThat(found, lessThan(0)); assertThat(found, lessThan(0));
} }
@Test
public final void givenEvenNumbers_whenCheckingIfAllSatisfyTheEvenPredicate_thenYes() {
final List<Integer> eventNumbers = Lists.newArrayList(2, 6, 8, 10, 34, 90);
final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
@Override
public final boolean apply(final Integer number) {
return (number % 2) == 0;
}
};
assertTrue(Iterables.all(eventNumbers, acceptEvenNumber));
}
// Set+Function => Map
/**
* - see: http://code.google.com/p/guava-libraries/issues/detail?id=56
*/
@Test
public final void whenMapIsBackedBySetAndFunction_thenCorrect() {
final Function<Integer, Integer> powerOfTwo = new Function<Integer, Integer>() {
@Override
public final Integer apply(final Integer input) {
return (int) Math.pow(input, 2);
}
};
final Set<Integer> lowNumbers = Sets.newHashSet(2, 3, 4);
final Map<Integer, Integer> numberToPowerOfTwoMuttable = Maps.asMap(lowNumbers, powerOfTwo);
final Map<Integer, Integer> numberToPowerOfTwoImuttable = Maps.toMap(lowNumbers, powerOfTwo);
assertThat(numberToPowerOfTwoMuttable.get(2), equalTo(4));
assertThat(numberToPowerOfTwoImuttable.get(2), equalTo(4));
}
} }