Bael 2712 lombok builder singular (#6435)
* updated lombok libs to 1.18.4 * sketched out basic test class for @singular * more examples showing other collection types, non-standard plural * fixed indentation
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Dave Crane
maibin
parent
e506bc1d75
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65ae0ce3c4
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package com.baeldung.lombok.builder.singular;
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import lombok.Builder;
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import lombok.Getter;
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import lombok.Singular;
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import java.time.LocalDate;
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import java.util.Date;
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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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@Getter
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@Builder
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public class Person {
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private final String givenName;
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private final String additionalName;
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private final String familyName;
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private final List<String> tags;
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@Singular private final List<String> interests;
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@Singular private final Set<String> skills;
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@Singular private final Map<String, LocalDate> awards;
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}
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package com.baeldung.lombok.builder.singular;
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import java.util.List;
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import lombok.Builder;
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import lombok.Getter;
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import lombok.Singular;
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@Getter
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@Builder
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public class Sea {
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@Singular private final List<String> grasses;
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@Singular("oneFish") private final List<String> fish;
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}
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package com.baeldung.lombok.builder.singular;
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import org.junit.Test;
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import java.time.LocalDate;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.*;
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public class BuilderWithSingularSupportForCollectionsUnitTest {
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@Test
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public void canAddMultipleElementsAsNewCollection() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.tags(Arrays.asList("fictional", "incidental"))
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.build();
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assertThat(person.getTags(), containsInAnyOrder("fictional", "incidental"));
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}
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@Test
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public void canUpdateCollectionAfterBuildIfMutableCollectionPassedToBuilder() throws Exception {
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List<String> tags = new ArrayList();
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tags.add("fictional");
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tags.add("incidental");
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.tags(tags)
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.build();
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person.getTags()
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.clear();
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person.getTags()
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.add("non-fictional");
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person.getTags()
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.add("important");
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assertThat(person.getTags(), containsInAnyOrder("non-fictional", "important"));
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}
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@Test(expected = UnsupportedOperationException.class)
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public void cannotUpdateCollectionAfterBuildIfImmutableCollectionPassedToBuilder() throws Exception {
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List<String> tags = Arrays.asList("fictional", "incidental");
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.tags(tags)
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.build();
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person.getTags()
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.clear();
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}
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@Test
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public void canAssignToSingularAnnotatedCollectionOneByOne() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.interest("history")
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.interest("sport")
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.build();
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assertThat(person.getInterests(), containsInAnyOrder("sport", "history"));
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}
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@Test(expected = UnsupportedOperationException.class)
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public void singularAnnotatedBuilderCreatesImmutableCollection() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.interest("history")
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.interest("sport")
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.build();
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person.getInterests()
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.clear();
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}
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@Test
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public void unpopulatedListsCreatedAsNullIfNotSingularButEmptyArrayIfSingular() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.build();
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assertThat(person.getInterests(), hasSize(0));
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assertThat(person.getSkills(), hasSize(0));
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assertThat(person.getAwards()
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.keySet(), hasSize(0));
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assertThat(person.getTags(), is(nullValue()));
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}
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@Test
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public void singularSupportsSetsToo() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.skill("singing")
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.skill("dancing")
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.build();
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assertThat(person.getSkills(), contains("singing", "dancing"));
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}
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@Test
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public void singularSetsAreLenientWithDuplicates() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.interest("singing")
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.interest("singing")
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.skill("singing")
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.skill("singing")
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.build();
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assertThat(person.getInterests(), contains("singing", "singing"));
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assertThat(person.getSkills(), contains("singing"));
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}
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@Test
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public void singularSupportsMapsToo() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.award("Singer of the Year", LocalDate.now()
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.minusYears(5))
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.award("Best Dancer", LocalDate.now()
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.minusYears(2))
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.build();
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assertThat(person.getAwards()
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.keySet(), contains("Singer of the Year", "Best Dancer"));
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assertThat(person.getAwards()
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.get("Best Dancer"),
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is(LocalDate.now()
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.minusYears(2)));
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}
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@Test
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public void singularIsLenientWithMapKeys() throws Exception {
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Person person = Person.builder()
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.givenName("Aaron")
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.additionalName("A")
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.familyName("Aardvark")
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.award("Best Dancer", LocalDate.now()
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.minusYears(5))
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.award("Best Dancer", LocalDate.now()
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.minusYears(4))
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.award("Best Dancer", LocalDate.now()
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.minusYears(3))
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.award("Best Dancer", LocalDate.now()
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.minusYears(2))
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.award("Best Dancer", LocalDate.now()
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.minusYears(1))
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.build();
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assertThat(person.getAwards()
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.keySet(), hasSize(1));
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assertThat(person.getAwards()
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.get("Best Dancer"),
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is(LocalDate.now()
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.minusYears(1)));
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}
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@Test
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public void wordsWithNonStandardPlurals() throws Exception {
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Sea sea = Sea.builder()
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.grass("Dulse")
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.grass("Kelp")
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.oneFish("Cod")
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.oneFish("Mackerel")
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.build();
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assertThat(sea.getGrasses(), contains("Dulse", "Kelp"));
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assertThat(sea.getFish(), contains("Cod", "Mackerel"));
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}
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}
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