Class XsltReport

basex-core/src/main/java/org/basex/query/func/xslt/XsltReport.java:28–149

XSLT report builder, with focus on the XSLT Saxon processor. @author BaseX Team, BSD License @author Christian Gruen

 * @author Christian Gruen
 */
final class XsltReport {
  /** Saxon TransformerImpl class. */
  private static final Class<?> TI = Reflect.find("net.sf.saxon.jaxp.TransformerImpl");
  /** Saxon XsltController class. */
  private static final Class<?> XC = Reflect.find("net.sf.saxon.trans.XsltController");
  /** Saxon MessageWarner class. */
  private static final Class<?> MW = Reflect.find("net.sf.saxon.serialize.MessageWarner");

  /** TransformerImpl.getUnderlyingController method. */
  private static final Method TI_GUC = Reflect.method(TI, "getUnderlyingController");
  /** MessageWarner.getWriter method. */
  private static final Method MW_GW = Reflect.method(MW, "getWriter");
  /** XsltController.setMessageFactory method. */
  private static final Method MW_SMW = Reflect.method(XC, "setMessageFactory", Supplier.class);

  /** Report map builder. */
  private final MapBuilder report = new MapBuilder();
  /** Saxon-specific: Message collector. */
  private final Stack<Object> messages = new Stack<>();
  /** Query context. */
  private final QueryContext qc;

  /**
   * Constructor.
   * @param qc query context
   */
  XsltReport(final QueryContext qc) {
    this.qc = qc;
  }

  /**
   * Registers a message factory to collect messages.
   * @param tr transformer
   */
  void register(final Transformer tr) {
    if(tr.getClass() == TI) {
      try {
        final Supplier<Object> supplier = () -> {
          final Object mw = Reflect.get(MW);
          messages.add(mw);
          return mw;
        };
        MW_SMW.invoke(TI_GUC.invoke(tr), supplier);
      } catch(final Exception ex) {
        Util.stack(ex);
      }
    }
  }

  /**
   * Adds a result.
   * @param result transformation result
   * @throws QueryException query exception
   */
  void addResult(final byte[] result) throws QueryException {
    report.put("result", convert(new IOContent(result), true));
  }