OZG-4461 single processorName fix

src/main/java/de/ozgcloud/processor/processor/ProcessorEventListener.java

@@ -75,8 +75,12 @@ class ProcessorEventListener {
 	}
 
 	@SuppressWarnings("unchecked")
-	private Collection<String> getProcessorNames(Command command) {
-		return (Collection<String>) MapUtils.getObject(command.getBodyObject(), COMMAND_PROCESSOR_NAMES_KEY, Collections.emptyList());
+	Collection<String> getProcessorNames(Command command) {
+		var processorNames = MapUtils.getObject(command.getBodyObject(), COMMAND_PROCESSOR_NAMES_KEY, Collections.emptyList());
+		if (processorNames instanceof String processorNamesStr) {
+			return Collections.singleton(processorNamesStr);
+		}
+		return (Collection<String>) processorNames;
 	}
 
 	private ProcessorResult addVorgangId(ProcessorResult result, String vorgangId) {

src/test/java/de/ozgcloud/processor/processor/ProcessorEventListenerTest.java

@@ -6,6 +6,7 @@ import static org.mockito.Mockito.*;
 
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Stream;
@@ -131,7 +132,8 @@ class ProcessorEventListenerTest {
 
 		private final Vorgang vorgang = VorgangTestFactory.create();
 		private final Collection<String> processorNames = List.of("dummy1", "dummy2");
-		private final Command command = CommandTestFactory.createBuilder().bodyObject(Map.of(ProcessorEventListener.COMMAND_PROCESSOR_NAMES_KEY, processorNames)).build();
+		private final Command command = CommandTestFactory.createBuilder()
+				.bodyObject(Map.of(ProcessorEventListener.COMMAND_PROCESSOR_NAMES_KEY, processorNames)).build();
 		private final CommandCreatedEvent event = new CommandCreatedEvent(command);
 
 		@DisplayName("process flow")
@@ -176,6 +178,31 @@ class ProcessorEventListenerTest {
 			}
 		}
 
+		@DisplayName("get processorNames")
+		@Nested
+		class TestGetProcessorNames {
+
+			@Test
+			void shouldReturnSingletonList() {
+				var processorNames = vorgangEventListener.getProcessorNames(createCommand("singleName"));
+
+				assertThat(processorNames).isInstanceOf(Collection.class).containsExactly("singleName");
+			}
+
+			@Test
+			void shouldReturnList() {
+				var processorNames = vorgangEventListener.getProcessorNames(createCommand(List.of("name", "otherName")));
+
+				assertThat(processorNames).isInstanceOf(Collection.class).containsExactly("name", "otherName");
+			}
+
+			private Command createCommand(Object processorNames) {
+				var map = new HashMap<String, Object>();
+				map.put(ProcessorEventListener.COMMAND_PROCESSOR_NAMES_KEY, processorNames);
+				return CommandTestFactory.createBuilder().bodyObject(map).build();
+			}
+		}
+
 		@DisplayName("publish command processed event")
 		@Nested
 		class TestPublishCommandProcessedEvent {