Added support for Java 20-21 specific options

src/main/java/rife/bld/operations/JlinkOptions.java

@@ -49,6 +49,23 @@ public class JlinkOptions extends HashMap<String, String> {
         return this;
     }
 
+    /**
+     * Compression to use in compressing resources.
+     * <p>
+     * <b>Requires Java 21 or higher</b>.
+     * <p>
+     * Where {@link ZipCompression#ZIP_0 ZIP_0} provides no compression and {@link ZipCompression#ZIP_9 ZIP_9} provides
+     * the best compression.
+     * <p>Default is {@link ZipCompression#ZIP_6 ZIP_6}
+     *
+     * @param compression the {@link ZipCompression compression} level
+     * @return this map of options
+     */
+    public JlinkOptions compress(ZipCompression compression) {
+        put("--compress", compression.level);
+        return this;
+    }
+
     /**
      * Enable compression of resources.
      *

src/main/java/rife/bld/operations/JmodOptions.java

@@ -38,6 +38,24 @@ public class JmodOptions extends HashMap<String, String> {
         return this;
     }
 
+    /**
+     * Compression to use when creating the JMOD archive.
+     * <p>
+     * <b>Requires Java 20 or higher</b>.
+     * <p>
+     * Where {@link ZipCompression#ZIP_0 ZIP_0} provides no compression and {@link ZipCompression#ZIP_9 ZIP_9} provides the
+     * best compression.
+     * <p>
+     * Default is {@link ZipCompression#ZIP_6 ZIP_6}
+     *
+     * @param compression the {@link ZipCompression compression} level
+     * @return this map of options
+     */
+    public JmodOptions compress(ZipCompression compression) {
+        put("--compress", compression.level);
+        return this;
+    }
+
     /**
      * Location of user-editable config files
      *

src/main/java/rife/bld/operations/JpackageOptions.java

@@ -27,8 +27,10 @@ public class JpackageOptions extends HashMap<String, String> {
     /**
      * List of application launchers.
      * <p>
-     * The main application launcher will be built from the command line options. Additional alternative launchers
-     * can be built using this option, and this option can be used to build multiple additional launchers.
+     * The main application launcher will be built from the command line options.
+     * <p>
+     * Additional alternative launchers can be built using this option, and this option can be used to build multiple
+     * additional launchers.
      *
      * @param launcher one or more {@link Launcher}
      * @return this map of options
@@ -58,6 +60,8 @@ public class JpackageOptions extends HashMap<String, String> {
 
     /**
      * List of paths to files and/or directories to add to the application payload.
+     * <p>
+     * <b>Requires Java 20 or higher</b>.
      *
      * @param additionalContent one or more path
      * @return this map of options
@@ -213,6 +217,8 @@ public class JpackageOptions extends HashMap<String, String> {
     /**
      * Request to create an installer that will register the main application launcher as a background service-type
      * application.
+     * <p>
+     * <b>Requires Java 20 or higher</b>.
      *
      * @param launcherAsService {@code true} to register the launcher as a service; {@code false} otherwise
      * @return this map of options

src/main/java/rife/bld/operations/ZipCompression.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright 2024 Erik C. Thauvin (https://erik.thauvin.net/)
+ * Licensed under the Apache License, Version 2.0 (the "License")
+ */
+package rife.bld.operations;
+
+/**
+ * The zip compression levels for jlink and jmod.
+ *
+ * @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
+ * @since 2.0.2
+ */
+public enum ZipCompression {
+    ZIP_0("zip-0"),
+    ZIP_1("zip-1"),
+    ZIP_2("zip-2"),
+    ZIP_3("zip-3"),
+    ZIP_4("zip-4"),
+    ZIP_5("zip-5"),
+    ZIP_6("zip-6"),
+    ZIP_7("zip-7"),
+    ZIP_8("zip-8"),
+    ZIP_9("zip-9");
+
+    public final String level;
+
+    ZipCompression(String level) {
+        this.level = level;
+    }
+}

src/test/java/rife/bld/operations/TestJlinkOperation.java

@@ -97,8 +97,13 @@ public class TestJlinkOperation {
                     .modulePath("src/test/resources/jlink/build/jmod")
                     .addModules("dev.mccue.tree")
                     .launcher("tree", "dev.mccue.tree", "dev.mccue.tree.Tree")
-                    .compress(CompressionLevel.NO_COMPRESSION)
                     .output(output.getAbsolutePath());
+            if (Runtime.version().version().get(0) >= 21) {
+                options.compress(ZipCompression.ZIP_6);
+            } else {
+                options.compress(CompressionLevel.ZIP);
+            }
+
             var jlink = new JlinkOperation().jlinkOptions(options);
 
             assertDoesNotThrow(jlink::execute);

src/test/java/rife/bld/operations/TestJmodOperation.java

@@ -109,6 +109,10 @@ public class TestJmodOperation {
             var mod = new File(tmpdir, "dev.mccue.tree.jmod");
 
             var options = new JmodOptions().classpath("src/test/resources/jlink/build/jar/dev.mccue.tree.jar");
+            if (Runtime.version().version().get(0) >= 20) {
+                options.compress(ZipCompression.ZIP_9);
+            }
+
             var jmod = new JmodOperation()
                     .operationMode(OperationMode.CREATE)
                     .jmodFile(mod.getAbsolutePath())