[2.4] Support ClassInfo signature at any position

pom.xml

@@ -129,7 +129,7 @@
         <dependency>
             <groupId>org.jboss.jandex</groupId>
             <artifactId>typeannotation-test</artifactId>
-            <version>1.9</version>
+            <version>1.10</version>
             <type>jar</type>
             <scope>test</scope>
         </dependency>

src/main/java/org/jboss/jandex/Indexer.java

@@ -270,6 +270,7 @@ private static void skipFully(InputStream s, long n) throws IOException {
     private ArrayList<AnnotationInstance> elementAnnotations;
     private IdentityHashMap<AnnotationTarget, Object> signaturePresent;
     private List<Object> signatures;
+    private int classSignatureIndex;
     private Map<DotName, InnerClassInfo> innerClasses;
     private IdentityHashMap<AnnotationTarget, List<TypeAnnotationState>> typeAnnotations;
     private List<MethodInfo> methods;
@@ -320,6 +321,7 @@ private void initClassFields() {
         elementAnnotations = new ArrayList<AnnotationInstance>();
         signaturePresent = new IdentityHashMap<AnnotationTarget, Object>();
         signatures = new ArrayList<Object>();
+        classSignatureIndex = -1;
         typeAnnotations = new IdentityHashMap<AnnotationTarget, List<TypeAnnotationState>>();
 
         // in bytecode, record components are stored as class attributes,
@@ -1386,6 +1388,9 @@ private void processExceptions(DataInputStream data, MethodInfo target) throws I
 
     private void processSignature(DataInputStream data, AnnotationTarget target) throws IOException {
         String signature =  decodeUtf8Entry(data.readUnsignedShort());
+        if (target instanceof ClassInfo) {
+            classSignatureIndex = signatures.size();
+        }
         signatures.add(signature);
         signatures.add(target);
         signaturePresent.put(target, null);
@@ -1401,14 +1406,18 @@ private void parseClassSignature(String signature, ClassInfo clazz) {
     private void applySignatures() {
         int end = signatures.size();
 
-        // Class signature is always the last element and should be processed first
-        Object last = end > 1 ? signatures.get(end - 1) : null;
-        if (last instanceof ClassInfo) {
-            parseClassSignature((String)signatures.get(end - 2), (ClassInfo)last);
-            end -= 2;
+        // Class signature should be processed first to establish class type parameters
+        if (classSignatureIndex >= 0) {
+            String elementSignature = (String) signatures.get(classSignatureIndex);
+            Object element = signatures.get(classSignatureIndex + 1);
+            parseClassSignature(elementSignature, (ClassInfo) element);
         }
 
         for (int i = 0; i < end; i += 2) {
+            if (i == classSignatureIndex) {
+                continue;
+            }
+
             String elementSignature = (String) signatures.get(i);
             Object element = signatures.get(i + 1);
 
@@ -1995,6 +2004,7 @@ public ClassInfo index(InputStream stream) throws IOException {
             elementAnnotations = null;
             innerClasses = null;
             signatures = null;
+            classSignatureIndex = -1;
             signaturePresent = null;
         }
     }

src/test/java/org/jboss/jandex/test/RecordTestCase.java

@@ -77,7 +77,7 @@ public void testRecordComponentHasAnnotation() {
         assertEquals("name", componentAnnos.get(0).target().asRecordComponent().name());
         assertEquals("nameComponent", componentAnnos.get(0).value().asString());
 
-        assertEquals(2, rec.recordComponents().size());
+        assertEquals(3, rec.recordComponents().size());
 
         RecordComponentInfo idComponent = rec.recordComponent("id");
         assertNotNull(idComponent);
@@ -144,6 +144,16 @@ public void testComponentAccessorHasAnnotation() {
         assertEquals("nameAccessor", nameAnnotations.get(1).value().asString());
     }
 
+    @Test
+    public void testRecordSignatureProcessed() {
+        ClassInfo rec = index.getClassByName(DotName.createSimple("test.RecordExample"));
+        assertNotNull(rec);
+        assertTrue(rec.isRecord());
+
+        assertEquals(1, rec.typeParameters().size());
+        assertEquals("T", rec.typeParameters().get(0).identifier());
+    }
+
     private Index buildIndex() throws IOException {
         Indexer indexer = new Indexer();
         indexer.index(getClass().getClassLoader().getResourceAsStream("test/RecordExample.class"));