remove requires value from extension annotation and add new requires annotation instead

scm-annotations/src/main/java/sonia/scm/plugin/Extension.java

@@ -41,14 +41,4 @@ import java.lang.annotation.Target;
 @PluginAnnotation("extension")
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Extension {
-  /**
-   * This extension is loaded only if all of the specified plugins are installed.
-   * The requires attribute can be used to implement optional extensions.
-   * A plugin author is able to implement an extension point of an optional plugin and the extension is only loaded if
-   * all of the specified plugins are installed.
-   *
-   * @since 2.0.0
-   * @return list of required plugins to load this extension
-   */
-  String[] requires() default {};
 }

scm-annotations/src/main/java/sonia/scm/plugin/Requires.java

@@ -0,0 +1,38 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.plugin;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target({ ElementType.TYPE })
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Requires {
+  String[] value();
+}