public void checkArguments(StaticContext env) throws XPathException { if (checked) return; checked = true; super.checkArguments(env); Optimizer opt = env.getConfiguration().getOptimizer(); argument[1] = ExpressionTool.unsorted(opt, argument[1], false); if (argument[0] instanceof StringValue) { // common case, key name is supplied as a constant try { keyFingerprint = ((ExpressionContext) env) .getFingerprint(((StringValue) argument[0]).getStringValue(), false); } catch (XPathException e) { StaticError err = new StaticError( "Error in key name " + ((StringValue) argument[0]).getStringValue() + ": " + e.getMessage()); err.setLocator(this); err.setErrorCode("XTDE1260"); throw err; } if (keyFingerprint == -1) { StaticError err = new StaticError( "Key " + ((StringValue) argument[0]).getStringValue() + " has not been defined"); err.setLocator(this); err.setErrorCode("XTDE1260"); throw err; } } else { // we need to save the namespace context nsContext = env.getNamespaceResolver(); } }