How to use

replaceChild

method

in

org.xwiki.rendering.block.XDOM

/**
 * Clone and filter wiki macro content depending of the context.
 * 
 * @param context the macro execution context
 * @return the cleaned wiki macro content
 */
private XDOM prepareWikiMacroContent()
{
  XDOM xdom = this.wikimacro.getContent().clone();
  // Macro code segment is always parsed into a separate xdom document. Now if this code segment starts with
  // another macro block, it will always be interpreted as a block macro regardless of the current wiki macro's
  // context (because as far as the nested macro is concerned, it starts on a new line). This will introduce
  // unnecessary paragraph elements when the wiki macro is used inline, so we need to force such opening macro
  // blocks to behave as inline macros if the wiki macro is used inline.
  if (this.inline) {
    List<Block> children = xdom.getChildren();
    if (!children.isEmpty() && children.get(0) instanceof MacroBlock) {
      MacroBlock old = (MacroBlock) children.get(0);
      MacroBlock replacement = new MacroBlock(old.getId(), old.getParameters(), old.getContent(), true);
      xdom.replaceChild(replacement, old);
    }
  }
  return xdom;
}