XRENDERING-803: Add support for overwriting the list of transformations to execute from the transformation context

xwiki-rendering-api/src/main/java/org/xwiki/rendering/internal/transformation/DefaultTransformationManager.java

@@ -83,7 +83,7 @@ public class DefaultTransformationManager implements TransformationManager
     public void performTransformations(Block block, TransformationContext context) throws TransformationException
     {
         Map<String, String> transformationsInError = null;
-        for (Transformation transformation : getTransformations()) {
+        for (Transformation transformation : getTransformations(context)) {
             try {
                 ((MutableRenderingContext) this.renderingContext).transformInContext(transformation, context, block);
             } catch (Exception e) {
@@ -106,6 +106,18 @@ public void performTransformations(Block block, TransformationContext context) t
         }
     }
 
+    private List<Transformation> getTransformations(TransformationContext context)
+    {
+        List<String> transformationNames = context.getTransformationNames();
+        if (transformationNames == null || transformationNames.isEmpty()) {
+            // Execute the transformations specified in the configuration.
+            return getTransformations();
+        } else {
+            // Execute the transformations specified on the transformation context.
+            return getTransformations(transformationNames);
+        }
+    }
+
     /**
      * @return the ordered list of Transformations to execute
      */

xwiki-rendering-api/src/main/java/org/xwiki/rendering/transformation/TransformationContext.java

@@ -19,6 +19,8 @@
  */
 package org.xwiki.rendering.transformation;
 
+import java.util.List;
+
 import org.xwiki.rendering.block.XDOM;
 import org.xwiki.rendering.syntax.Syntax;
 
@@ -55,6 +57,12 @@ public class TransformationContext implements Cloneable
      */
     private Syntax targetSyntax;
 
+    /**
+     * @see #getTransformationNames()
+     * @since 18.1.0RC1
+     */
+    private List<String> transformationNames;
+
     /**
      * Default constructor that doesn't set the XDOM or the Syntax. This is because setting the XDOM and the Syntax is
      * optional and only required by some Macros to behave as expected.
@@ -166,6 +174,29 @@ public Syntax getTargetSyntax()
         return this.targetSyntax;
     }
 
+    /**
+     * @return the list of transformations to execute; if not set or empty, the configured list of transformations will
+     *         be executed
+     * @see org.xwiki.rendering.configuration.RenderingConfiguration#getTransformationNames()
+     * @since 18.1.0RC1
+     */
+    public List<String> getTransformationNames()
+    {
+        return this.transformationNames;
+    }
+
+    /**
+     * Set the list of transformations to execute. Use this to override the configured list of transformations.
+     *
+     * @param transformationNames the list of transformations to execute
+     * @see org.xwiki.rendering.configuration.RenderingConfiguration#getTransformationNames()
+     * @since 18.1.0RC1
+     */
+    public void setTransformationNames(List<String> transformationNames)
+    {
+        this.transformationNames = transformationNames;
+    }
+
     /**
      * @param targetSyntax the syntax of the renderer
      */