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feat BAEL-6092 Record Patterns (eugenp#13243)
* feat BAEL-6092 Record Patterns * Update pom.xml * Update pom.xml * Add additional Switch Test Case
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‎core-java-modules/core-java-19/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<artifactId>core-java-19</artifactId>
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<properties>
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<maven.compiler.source>19</maven.compiler.source>
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<maven.compiler.target>19</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>19</source>
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<target>19</target>
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<compilerArgs>--enable-preview</compilerArgs>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎core-java-modules/core-java-19/src/main/java/com/baeldung/features/records/GPSPoint.java‎

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package com.baeldung.features.records;
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public record GPSPoint (double lat, double lng) { }

‎core-java-modules/core-java-19/src/main/java/com/baeldung/features/records/ILocation.java‎

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package com.baeldung.features.records;
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public sealed interface ILocation permits Location {
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default String getName() {
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return switch (this) {
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case Location(var name, var ignored) -> name;
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};
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}
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}

‎core-java-modules/core-java-19/src/main/java/com/baeldung/features/records/Location.java‎

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package com.baeldung.features.records;
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public record Location(String name, GPSPoint gpsPoint) implements ILocation {
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}
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‎core-java-modules/core-java-19/src/main/java/com/baeldung/features/records/LocationWrapper.java‎

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package com.baeldung.features.records;
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public record LocationWrapper<T>(T t, String description) { }

‎core-java-modules/core-java-19/src/test/java/com/baeldung/features/JEP405RecordPatternsUnitTest.java‎

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package com.baeldung.features;
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import com.baeldung.features.records.GPSPoint;
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import com.baeldung.features.records.Location;
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import com.baeldung.features.records.LocationWrapper;
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import org.junit.jupiter.api.Test;
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import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
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public class JEP405RecordPatternsUnitTest {
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Object object = new Location("Home", new GPSPoint(1.0, 2.0));
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@Test
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void givenObject_whenTestInstanceOfAndCastIdiom_shouldMatchNewInstanceOf() {
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// old Code
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if (object instanceof Location) {
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Location l = (Location) object;
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assertThat(l).isInstanceOf(Location.class);
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}
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// new code
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if (object instanceof Location l) {
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assertThat(l).isInstanceOf(Location.class);
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}
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}
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@Test
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void givenObject_whenTestDestruct_shouldMatch() {
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// when
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if (object instanceof Location(var name, var gpsPoint)) {
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// then
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assertThat(name).isEqualTo("Home");
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assertThat(gpsPoint).isInstanceOf(GPSPoint.class);
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}
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if (object instanceof Location(var name, GPSPoint(var lat, var lng))) {
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assertThat(lat).isEqualTo(1.0);
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assertThat(lng).isEqualTo(2.0);
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}
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}
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@Test
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void givenObjectIsNull_whenTestNullCheck_shouldNotMatch() {
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Location l = null;
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if (l instanceof Location location) {
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assertThat(location).isNotNull();
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}
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}
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@Test
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void givenObject_whenTestGenericTypeInstanceOf_shouldMatch() {
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LocationWrapper<Location> locationWrapper = new LocationWrapper<>(new Location("Home", new GPSPoint(1.0, 2.0)), "Description");
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if (locationWrapper instanceof LocationWrapper<Location>(var ignored, var description)) {
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assertThat(description).isEqualTo("Description");
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}
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}
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@Test
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void givenObject_whenTestSwitchExpressionWithTypePattern_shouldMatch() {
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String result = switch (object) {
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case Location l -> l.name();
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default -> "default";
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};
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assertThat(result).isEqualTo("Home");
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Double result2 = switch (object) {
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case Location(var name, GPSPoint(var lat, var lng)) -> lat;
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default -> 0.0;
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};
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assertThat(result2).isEqualTo(1.0);
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}
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@Test
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void givenObject_whenTestGuardedSwitchExpressionWithTypePattern_shouldMatchAndGuard() {
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String result = switch (object) {
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case Location(var name, var ignored) when name.equals("Home") -> "Test";
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case Location(var name, var ignored) -> name;
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default -> "default";
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};
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assertThat(result).isEqualTo("Test");
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String otherResult = switch (new Location("Other", new GPSPoint(1.0, 2.0))) {
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case Location(var name, var ignored) when name.equals("Home") -> "Test";
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case Location(var name, var ignored) -> name;
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default -> "default";
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};
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assertThat(otherResult).isEqualTo("Other");
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Object noLocation = new GPSPoint(1.0, 2.0);
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String noLocationResult = switch (noLocation) {
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case Location(var name, var ignored) when name.equals("Home") -> "Test";
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case Location(var name, var ignored) -> name;
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default -> "default";
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};
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assertThat(noLocationResult).isEqualTo("default");
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}
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}

‎core-java-modules/pom.xml‎

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</dependencies>
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</dependencyManagement>
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</project>
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</project>

‎pom.xml‎

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<!-- <module>core-java-modules/core-java-15</module> --> <!-- uses preview features, to be decided how to handle -->
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<!-- <module>core-java-modules/core-java-16</module> --> <!-- uses preview features, to be decided how to handle -->
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<!-- <module>core-java-modules/core-java-17</module> --> <!-- uses preview features, to be decided how to handle -->
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<!-- <module>core-java-modules/core-java-19</module> --> <!-- uses preview features, to be decided how to handle -->
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<module>core-java-modules/core-java-collections-set</module>
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<module>core-java-modules/core-java-collections-list-4</module>
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<module>core-java-modules/core-java-collections-maps-4</module>

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