79 lines
3.1 KiB
Java
79 lines
3.1 KiB
Java
package com.baeldung.commons.collections;
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import org.apache.commons.collections4.SetUtils;
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import org.apache.commons.collections4.set.TransformedSet;
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import org.junit.Test;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Set;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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public class SetUtilsUnitTest {
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@Test(expected = IllegalArgumentException.class)
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public void givenSetAndPredicate_whenPredicatedSet_thenValidateSet_and_throw_IllegalArgumentException() {
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Set<String> sourceSet = new HashSet<>();
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sourceSet.addAll(Arrays.asList("London", "Lagos", "Err Source1"));
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Set<String> validatingSet = SetUtils.predicatedSet(sourceSet, (s) -> s.startsWith("L"));
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validatingSet.add("Err Source2");
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}
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@Test
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public void givenTwoSets_whenDifference_thenSetView() {
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Set<Integer> a = new HashSet<>(Arrays.asList(1, 2, 5));
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Set<Integer> b = new HashSet<>(Arrays.asList(1, 2));
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SetUtils.SetView<Integer> result = SetUtils.difference(a, b);
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assertTrue(result.size() == 1 && result.contains(5));
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}
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@Test
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public void givenTwoSets_whenUnion_thenUnionResult() {
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Set<Integer> a = new HashSet<>(Arrays.asList(1, 2, 5));
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Set<Integer> b = new HashSet<>(Arrays.asList(1, 2));
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Set<Integer> expected = new HashSet<>(Arrays.asList(1, 2, 5));
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SetUtils.SetView<Integer> union = SetUtils.union(a, b);
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assertTrue(SetUtils.isEqualSet(expected, union));
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}
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@Test
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public void givenTwoSets_whenIntersection_thenIntersectionResult() {
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Set<Integer> a = new HashSet<>(Arrays.asList(1, 2, 5));
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Set<Integer> b = new HashSet<>(Arrays.asList(1, 2));
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Set<Integer> expected = new HashSet<>(Arrays.asList(1, 2));
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SetUtils.SetView<Integer> intersect = SetUtils.intersection(a, b);
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assertTrue(SetUtils.isEqualSet(expected, intersect));
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}
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@Test
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public void givenSet_whenTransformedSet_thenTransformedResult() {
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Set<Integer> a = SetUtils.transformedSet(new HashSet<>(), (e) -> e * 2);
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a.add(2);
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assertEquals(a.toArray()[0], 4);
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Set<Integer> source = new HashSet<>(Arrays.asList(1));
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Set<Integer> newSet = TransformedSet.transformedSet(source, (e) -> e * 2);
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assertEquals(newSet.toArray()[0], 2);
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assertEquals(source.toArray()[0], 2);
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}
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@Test
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public void givenTwoSet_whenDisjunction_thenDisjunctionSet() {
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Set<Integer> a = new HashSet<>(Arrays.asList(1, 2, 5));
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Set<Integer> b = new HashSet<>(Arrays.asList(1, 2, 3));
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SetUtils.SetView<Integer> result = SetUtils.disjunction(a, b);
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assertTrue(result.toSet().contains(5) && result.toSet().contains(3));
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}
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@Test
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public void givenSet_when_OrderedSet_thenMaintainElementOrder() {
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Set<Integer> set = new HashSet<>(Arrays.asList(10, 1, 5));
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System.out.println("unordered set: " + set);
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Set<Integer> orderedSet = SetUtils.orderedSet(new HashSet<>());
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orderedSet.addAll(Arrays.asList(10, 1, 5));
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System.out.println("ordered set = " + orderedSet);
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}
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} |