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Merge pull request #1702 from DamnClin/simple-collections-utility
Simple collections utility
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65 changes: 65 additions & 0 deletions
65
src/main/resources/generator/server/javatool/base/ProjectCollections.java.mustache
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package {{packageName}}.common.domain; | ||
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| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
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| /** | ||
| * Null safe utility class to manage collections | ||
| */ | ||
| public final class {{collectionClass}}Collections { | ||
| private {{collectionClass}}Collections() {} | ||
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| /** | ||
| * Get an immutable collection from the given collection | ||
| * | ||
| * @param <T> | ||
| * Type of this collection | ||
| * @param collection | ||
| * input collection | ||
| * @return An immutable collection | ||
| */ | ||
| public static <T> Collection<T> immutable(Collection<T> collection) { | ||
| if (collection == null) { | ||
| return Set.of(); | ||
| } | ||
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| return Collections.unmodifiableCollection(collection); | ||
| } | ||
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| /** | ||
| * Get an immutable set from the given set | ||
| * | ||
| * @param <T> | ||
| * Type of this set | ||
| * @param set | ||
| * input set | ||
| * @return An immutable set | ||
| */ | ||
| public static <T> Set<T> immutable(Set<T> set) { | ||
| if (set == null) { | ||
| return Set.of(); | ||
| } | ||
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| return Collections.unmodifiableSet(set); | ||
| } | ||
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| /** | ||
| * Get an immutable set from the given list | ||
| * | ||
| * @param <T> | ||
| * Type of this list | ||
| * @param list | ||
| * input list | ||
| * @return An immutable list | ||
| */ | ||
| public static <T> List<T> immutable(List<T> list) { | ||
| if (list == null) { | ||
| return List.of(); | ||
| } | ||
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| return Collections.unmodifiableList(list); | ||
| } | ||
| } |
89 changes: 89 additions & 0 deletions
89
src/main/resources/generator/server/javatool/base/ProjectCollectionsTest.java.mustache
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package {{packageName}}.common.domain; | ||
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| import static org.assertj.core.api.Assertions.*; | ||
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| import {{packageName}}.UnitTest; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import org.junit.jupiter.api.DisplayName; | ||
| import org.junit.jupiter.api.Nested; | ||
| import org.junit.jupiter.api.Test; | ||
|
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| @UnitTest | ||
| class {{collectionClass}}CollectionsTest { | ||
| @Nested | ||
| @DisplayName("Collections") | ||
| class {{collectionClass}}CollectionsCollectionsTest { | ||
| @Test | ||
| void shouldGetEmptyImmutableCollectionFromNullCollection() { | ||
| Collection<Object> input = null; | ||
| Collection<Object> collection = {{collectionClass}}Collections.immutable(input); | ||
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| assertThat(collection).isEmpty(); | ||
| assertThatThrownBy(() -> collection.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
|
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| @Test | ||
| void shouldGetImmutableCollectionFromMutableCollection() { | ||
| Collection<String> input = new ArrayList<>(); | ||
| input.add("value"); | ||
| Collection<String> collection = {{collectionClass}}Collections.immutable(input); | ||
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| assertThat(collection).containsExactly("value"); | ||
| assertThatThrownBy(() -> collection.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
| } | ||
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| @Nested | ||
| @DisplayName("Set") | ||
| class {{collectionClass}}CollectionsSetTest { | ||
| @Test | ||
| void shouldGetEmptyImmutableCollectionFromNullCollection() { | ||
| Set<Object> input = null; | ||
| Set<Object> set = {{collectionClass}}Collections.immutable(input); | ||
|
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| assertThat(set).isEmpty(); | ||
| assertThatThrownBy(() -> set.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
|
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| @Test | ||
| void shouldGetImmutableCollectionFromMutableCollection() { | ||
| Set<String> input = new HashSet<>(); | ||
| input.add("value"); | ||
| Set<String> set = {{collectionClass}}Collections.immutable(input); | ||
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| assertThat(set).containsExactly("value"); | ||
| assertThatThrownBy(() -> set.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
| } | ||
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| @Nested | ||
| @DisplayName("List") | ||
| class {{collectionClass}}CollectionsListTest { | ||
| @Test | ||
| void shouldGetEmptyImmutableCollectionFromNullCollection() { | ||
| List<Object> input = null; | ||
| List<Object> list = {{collectionClass}}Collections.immutable(input); | ||
|
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| assertThat(list).isEmpty(); | ||
| assertThatThrownBy(() -> list.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
|
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| @Test | ||
| void shouldGetImmutableCollectionFromMutableCollection() { | ||
| List<String> input = new ArrayList<>(); | ||
| input.add("value"); | ||
| List<String> list = {{collectionClass}}Collections.immutable(input); | ||
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| assertThat(list).containsExactly("value"); | ||
| assertThatThrownBy(() -> list.clear()).isExactlyInstanceOf(UnsupportedOperationException.class); | ||
| } | ||
| } | ||
| } |
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