Examples of org.zkoss.xel.VariableResolver

org.zkoss.xel.VariableResolver
Used to customize the way an {@link Expression} resolves variablereferences at evaluation time.
Since 5.0.0, you can implement another interface called {@link VariableResolverX}to have more control about resolving the variables.
Any class implementing this interface shall implement {@link Object#equals(Object)}and {@link Object#hashCode()} @author tomyeh @since 3.0.0 @see VariableResolverX

  }


  public static CellValue evaluate(Book book, Cell cell) {
    final XelContext old = XelContextHolder.getXelContext();
    try {
      final VariableResolver resolver = BookHelper.getVariableResolver(book);
      final FunctionMapper mapper = BookHelper.getFunctionMapper(book);
      final XelContext ctx = new SimpleXelContext(resolver, mapper);
      ctx.setAttribute("zkoss.zss.CellType", Object.class);
      XelContextHolder.setXelContext(ctx);
      final CellValue cv = book.getFormulaEvaluator().evaluate(cell);

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  }
  
  private static CellValue evaluateFormula(Book book, int sheetIndex, String formula) {
    final XelContext old = XelContextHolder.getXelContext();
    try {
      final VariableResolver resolver = BookHelper.getVariableResolver(book);
      final FunctionMapper mapper = BookHelper.getFunctionMapper(book);
      final XelContext ctx = new SimpleXelContext(resolver, mapper);
      ctx.setAttribute("zkoss.zss.CellType", Object.class);
      XelContextHolder.setXelContext(ctx);
      final CellValue cv = book.getFormulaEvaluator().evaluateFormula(sheetIndex, formula);

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  }


  private static ValueEval evaluateFormulaValueEval(Book book, int sheetIndex, String formula, boolean ignoreDereference) {
    final XelContext old = XelContextHolder.getXelContext();
    try {
      final VariableResolver resolver = BookHelper.getVariableResolver(book);
      final FunctionMapper mapper = BookHelper.getFunctionMapper(book);
      final XelContext ctx = new SimpleXelContext(resolver, mapper);
      ctx.setAttribute("zkoss.zss.CellType", Object.class);
      XelContextHolder.setXelContext(ctx);
      return book.getFormulaEvaluator().evaluateFormulaValueEval(sheetIndex, formula, ignoreDereference);

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