From 679ef705a16e92a86c0e81f4708e7a6c69d5f9ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Dinis=20Ferreira?= <hello@joaof.eu>
Date: Mon, 15 Jun 2026 23:11:01 +0200
Subject: [PATCH] refactor: migrate Xtend to Java -
 com.avaloq.tools.ddk.xtext.test.core (Tag)

DRAFT CHECKPOINT - DO NOT MERGE until the active-annotation question is resolved.

Converts the Tag active annotation (@Active(TagCompilationParticipant)) from
Xtend to Java, keeping @Active + the processor + org.eclipse.xtext.xtend.lib,
and removes the module's Xtend build infrastructure (.classpath, .project,
build.properties, xtend-gen). Local gate (-DskipTests) is green.

BLOCKED: Tag is an Xtend active annotation whose macro assigns each @Tag field a
unique integer at Xtend-compile time. DDK declares no @Tag fields itself (the
consumers are downstream), so DDK CI cannot validate that the macro still fires
for a Java-authored @interface. See the PR description for the resolution plan.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 com.avaloq.tools.ddk.xtext.test.core/.classpath     |  5 -----
 com.avaloq.tools.ddk.xtext.test.core/.project       |  6 ------
 .../build.properties                                |  3 +--
 .../tools/ddk/xtext/test/{Tag.xtend => Tag.java}    | 13 +++++++------
 .../xtend-gen/.gitignore                            |  0
 5 files changed, 8 insertions(+), 19 deletions(-)
 rename com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/{Tag.xtend => Tag.java} (75%)
 delete mode 100644 com.avaloq.tools.ddk.xtext.test.core/xtend-gen/.gitignore

diff --git a/com.avaloq.tools.ddk.xtext.test.core/.classpath b/com.avaloq.tools.ddk.xtext.test.core/.classpath
index 907a12b9cb..71aee59a71 100644
--- a/com.avaloq.tools.ddk.xtext.test.core/.classpath
+++ b/com.avaloq.tools.ddk.xtext.test.core/.classpath
@@ -1,11 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="src" path="xtend-gen">
-		<attributes>
-			<attribute name="ignore_optional_problems" value="true"/>
-		</attributes>
-	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins">
 		<accessrules>
diff --git a/com.avaloq.tools.ddk.xtext.test.core/.project b/com.avaloq.tools.ddk.xtext.test.core/.project
index 326acc3457..a65f2423c0 100644
--- a/com.avaloq.tools.ddk.xtext.test.core/.project
+++ b/com.avaloq.tools.ddk.xtext.test.core/.project
@@ -20,11 +20,6 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.xtext.ui.shared.xtextBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
 		<buildCommand>
 			<name>net.sf.eclipsecs.core.CheckstyleBuilder</name>
 			<arguments>
@@ -44,7 +39,6 @@
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.pde.PluginNature</nature>
-		<nature>org.eclipse.xtext.ui.shared.xtextNature</nature>
 		<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
 		<nature>net.sf.eclipsecs.core.CheckstyleNature</nature>
 		<nature>edu.umd.cs.findbugs.plugin.eclipse.findbugsNature</nature>
diff --git a/com.avaloq.tools.ddk.xtext.test.core/build.properties b/com.avaloq.tools.ddk.xtext.test.core/build.properties
index ea832598c9..b107977f4e 100644
--- a/com.avaloq.tools.ddk.xtext.test.core/build.properties
+++ b/com.avaloq.tools.ddk.xtext.test.core/build.properties
@@ -1,4 +1,3 @@
-source.. = src/,\
-           xtend-gen/
+source.. = src/
 bin.includes = META-INF/,\
                .
diff --git a/com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.xtend b/com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.java
similarity index 75%
rename from com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.xtend
rename to com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.java
index 892e50810b..5cc4a24878 100644
--- a/com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.xtend
+++ b/com.avaloq.tools.ddk.xtext.test.core/src/com/avaloq/tools/ddk/xtext/test/Tag.java
@@ -8,19 +8,20 @@
  * Contributors:
  *     Avaloq Group AG - initial API and implementation
  *******************************************************************************/
-package com.avaloq.tools.ddk.xtext.test
+package com.avaloq.tools.ddk.xtext.test;
 
-import java.lang.annotation.Retention
-import java.lang.annotation.RetentionPolicy
-import org.eclipse.xtend.lib.macro.Active
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import org.eclipse.xtend.lib.macro.Active;
 
 /**
  * Initializes global tags in linking tests.
  * The annotated field must be of integer type.
  * Usage example: @Tag int MEM_DOC
  */
-@Active(typeof(TagCompilationParticipant))
+@Active(TagCompilationParticipant.class)
 @Retention(RetentionPolicy.RUNTIME)
-annotation Tag {
+public @interface Tag {
 
 }
diff --git a/com.avaloq.tools.ddk.xtext.test.core/xtend-gen/.gitignore b/com.avaloq.tools.ddk.xtext.test.core/xtend-gen/.gitignore
deleted file mode 100644
index e69de29bb2..0000000000