diff --git a/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerBundleExtender.java b/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerBundleExtender.java
new file mode 100644
index 00000000000..447b3598ec6
--- /dev/null
+++ b/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerBundleExtender.java
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Christoph Läubrich and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ * Christoph Läubrich - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.transforms;
+
+import java.net.URL;
+import java.util.Dictionary;
+import java.util.Map;
+import org.osgi.framework.*;
+import org.osgi.util.tracker.BundleTracker;
+import org.osgi.util.tracker.BundleTrackerCustomizer;
+
+/**
+ * Extender that scans for bundle header {@value #EQUINOX_TRANSFORMER_HEADER}
+ * that declare a bundle wants to transform resources. The header can be either
+ * a resource in the bundle (e.g. /transform.csv
) in which case it
+ * is assumed to use the default replace transformer, or can specify a
+ * transformation type e.g. xslt;/transform.csv
+ */
+class TransformerBundleExtender implements BundleTrackerCustomizer> {
+
+ private static final String EQUINOX_TRANSFORMER_HEADER = "Equinox-Transformer"; //$NON-NLS-1$
+ private BundleContext bundleContext;
+
+ public TransformerBundleExtender(BundleContext bundleContext) {
+ this.bundleContext = bundleContext;
+ }
+
+ @Override
+ public ServiceRegistration addingBundle(Bundle bundle, BundleEvent event) {
+ TransformerInfo info = getTransformerInfo(bundle);
+ if (info != null) {
+ return bundleContext.registerService(URL.class, info.url(),
+ FrameworkUtil.asDictionary(Map.of(TransformTuple.TRANSFORMER_TYPE, info.type())));
+ }
+ return null;
+ }
+
+ @Override
+ public void modifiedBundle(Bundle bundle, BundleEvent event, ServiceRegistration registration) {
+ // state modifications are not relevant here
+ }
+
+ @Override
+ public void removedBundle(Bundle bundle, BundleEvent event, ServiceRegistration registration) {
+ registration.unregister();
+ }
+
+ private static TransformerInfo getTransformerInfo(Bundle bundle) {
+ Dictionary headers = bundle.getHeaders(""); //$NON-NLS-1$
+ String header = headers.get(EQUINOX_TRANSFORMER_HEADER);
+ if (header != null && !header.isBlank()) {
+ String[] split = header.split(";", 2); //$NON-NLS-1$
+ if (split.length == 2) {
+ URL entry = bundle.getEntry(split[1]);
+ if (entry != null) {
+ return new TransformerInfo(split[0], entry);
+ }
+ } else {
+ URL entry = bundle.getEntry(header);
+ if (entry != null) {
+ return new TransformerInfo("replace", entry); //$NON-NLS-1$
+ }
+ }
+ }
+ return null;
+ }
+
+ private static record TransformerInfo(String type, URL url) {
+
+ }
+
+ static void start(BundleContext bundleContext) {
+ BundleTracker> tracker = new BundleTracker<>(bundleContext, Bundle.RESOLVED,
+ new TransformerBundleExtender(bundleContext));
+ tracker.open();
+ }
+
+}
diff --git a/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerHook.java b/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerHook.java
index 1eecc150be6..257612d237c 100644
--- a/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerHook.java
+++ b/bundles/org.eclipse.equinox.transforms.hook/src/org/eclipse/equinox/internal/transforms/TransformerHook.java
@@ -46,6 +46,7 @@ public void addHooks(HookRegistry hookRegistry) {
public void start(BundleContext context) throws BundleException {
try {
+ TransformerBundleExtender.start(context);
this.transformers = new TransformerList(context, logServices);
} catch (InvalidSyntaxException e) {
throw new BundleException("Problem registering service tracker: transformers", e); //$NON-NLS-1$