OZG-4857 OZG-4934 compose method

alfa-xdomea/src/main/java/de/ozgcloud/alfa/kommentar/DateiformatCode.java

@@ -3,7 +3,6 @@ package de.ozgcloud.alfa.kommentar;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Objects;
 
 import org.apache.commons.lang3.StringUtils;
@@ -59,16 +58,29 @@ public final class DateiformatCode {
 	}
 
 	public static String getXdomeaCode(String mimeType, String extension) {
-		var fileExtensionToCodeMapping = mimeTypesMapping.getOrDefault(
+		var fileExtensionToCodeMapping = getFileExtensionToCodeMapping(mimeType);
+		if (hasSingleExtensionMapping(fileExtensionToCodeMapping)) {
+			return getCodeOrDefault(fileExtensionToCodeMapping);
+		}
+		return getCodeForExtensionOrDefault(extension, fileExtensionToCodeMapping);
+	}
+
+	private static Map<String, String> getFileExtensionToCodeMapping(String mimeType) {
+		return mimeTypesMapping.getOrDefault(
 				Objects.requireNonNullElse(mimeType, StringUtils.EMPTY),
 				Collections.emptyMap());
-		if (fileExtensionToCodeMapping.entrySet().size() == 1) {
-			return fileExtensionToCodeMapping.entrySet().stream().findFirst().map(Entry::getValue).orElse(SONSTIGES_CODE);
-		}
-		return fileExtensionToCodeMapping.getOrDefault(
-				Objects.requireNonNullElse(extension, StringUtils.EMPTY),
-				SONSTIGES_CODE
-		);
+	}
+
+	private static boolean hasSingleExtensionMapping(Map<String, String> fileExtensionToCodeMapping) {
+		return fileExtensionToCodeMapping.entrySet().size() == 1;
+	}
+
+	private static String getCodeOrDefault(Map<String, String> fileExtensionToCodeMapping) {
+		return fileExtensionToCodeMapping.values().stream().findFirst().orElse(SONSTIGES_CODE);
+	}
+
+	private static String getCodeForExtensionOrDefault(String extension, Map<String, String> fileExtensionToCodeMapping) {
+		return fileExtensionToCodeMapping.getOrDefault(Objects.requireNonNullElse(extension, StringUtils.EMPTY), SONSTIGES_CODE);
 	}
 
 }