WIP: Use Enum type instead of strings.

jacoco-maven-plugin/src/org/jacoco/maven/ReportFormat.java

@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2021 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Marc R. Hoffmann - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.maven;
+
+/**
+ * Configurable output formats for the report goals.
+ */
+public enum ReportFormat {
+
+	/**
+	 * Multi-page html report.
+	 */
+	HTML,
+
+	/**
+	 * Single-file XML report.
+	 */
+	XML,
+
+	/**
+	 * Single-file CSV report.
+	 */
+	CSV
+
+}