Add support for Maven 4 PluginDescriptor.getRequiredJavaVersion() method

maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/PluginDescriptorHelper.java

@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.tools.plugin;
+
+import java.lang.reflect.Method;
+
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+
+public class PluginDescriptorHelper {
+
+    private static final Method GET_REQUIRED_JAVA_VERSION_METHOD;
+    private static final Method SET_REQUIRED_JAVA_VERSION_METHOD;
+
+    static {
+        Method getMethod = null;
+        Method setMethod = null;
+        try {
+            getMethod = PluginDescriptor.class.getMethod("getRequiredJavaVersion");
+            setMethod = PluginDescriptor.class.getMethod("setRequiredJavaVersion", String.class);
+        } catch (NoSuchMethodException e) {
+            // Methods don't exist in this version of Maven
+        }
+        GET_REQUIRED_JAVA_VERSION_METHOD = getMethod;
+        SET_REQUIRED_JAVA_VERSION_METHOD = setMethod;
+    }
+
+    public static String getRequiredJavaVersion(PluginDescriptor descriptor) {
+        if (descriptor == null) {
+            return null;
+        }
+
+        // First try to use the direct method if available in Maven 4
+        if (GET_REQUIRED_JAVA_VERSION_METHOD != null) {
+            try {
+                return (String) GET_REQUIRED_JAVA_VERSION_METHOD.invoke(descriptor);
+            } catch (Exception e) {
+                // Fall back to the wrapper approach
+            }
+        }
+
+        // Fall back to the wrapper approach for Maven 3
+        if (descriptor instanceof ExtendedPluginDescriptor) {
+            return ((ExtendedPluginDescriptor) descriptor).getRequiredJavaVersion();
+        }
+
+        return null;
+    }
+
+    /**
+     * Sets the required Java version on a plugin descriptor.
+     * <p>
+     * This method works with both Maven 3 and Maven 4:
+     * <ul>
+     *   <li>In Maven 4, it uses the direct method on the PluginDescriptor class</li>
+     *   <li>In Maven 3, it uses the ExtendedPluginDescriptor wrapper</li>
+     * </ul>
+     *
+     * @param descriptor the plugin descriptor
+     * @param requiredJavaVersion the required Java version to set
+     * @return the modified plugin descriptor, or null if the input descriptor was null
+     */
+    public static PluginDescriptor setRequiredJavaVersion(PluginDescriptor descriptor, String requiredJavaVersion) {
+        if (descriptor == null) {
+            return null;
+        }
+
+        // First try to use the direct method if available in Maven 4
+        if (SET_REQUIRED_JAVA_VERSION_METHOD != null) {
+            try {
+                SET_REQUIRED_JAVA_VERSION_METHOD.invoke(descriptor, requiredJavaVersion);
+                return descriptor;
+            } catch (Exception e) {
+                // Fall back to the wrapper approach
+            }
+        }
+
+        // Fall back to the wrapper approach for Maven 3
+        if (!(descriptor instanceof ExtendedPluginDescriptor)) {
+            descriptor = new ExtendedPluginDescriptor(descriptor);
+        }
+        ((ExtendedPluginDescriptor) descriptor).setRequiredJavaVersion(requiredJavaVersion);
+        return descriptor;
+    }
+}