Illegal Syntax for Set Operation

[dhook.donald.hook.gmail.com]

I created have a seam-gen created app that I am modifying a search page to search on an ID (Integer) rather than a string.  The string search parms work fine, but the numeric ones do not.  For example, I have a list of items, of which I am using the selected item from the list (its id) to search.  I em up getting an Illegal Syntax for Set Operation and am not sure what I am doing wrong.  Any insight would be greatly appreciated. 

The Stocklist object extends EntityQuery and I have created a string attribute on it (stockList.emptyString) so that 0 is not displayed, otherwise 0 gets passed in for the search criteria.  So if the value is > 0, then display the value, otherwise display an empty string.

This is the error I receive.

07:18:15,171 SEVERE [component] /StockList.xhtml @30,146 value="#{ stockList.stock.exchangeId > 0 ? stockList.stock.exchangeId : stockList.emptyString  }": Illegal Syntax for Set Operation

Thanks .....

[niox.nikospara.yahoo.com]

The value of an editable component must be a r-value, ie an expression to which values can be assigned to. Is the following legal in Java? That's what you are trying to do.

(id > 0 ? id : foo.emptyString) = 1234;

One way to mimic the desired functionality is a synthetic property:

// NOTE: Error handling is left out
public String getSpecialExchangeId() {
  if( exchangeId == null || exchangeId.intValue() <= 0 ) return "";
  else return exchangeId.toString();
}
public void setSpecialExchangeId(String x) {
  Integer newid = new Integer(x);
  if( newid.intValue() > 0 ) exchangeId = newid;
  else exchangeId = null; // or anything appropriate
}

A more appropriate way would be to implement a standard javax.faces.convert.Converter that implements the desired behavior and register it to the input component.

[niox.nikospara.yahoo.com]

Nikos Paraskevopoulos wrote on Aug 05, 2009 14:49:


The value of an editable component must be a r-value,

...I mean a l-value...

[dhook.donald.hook.gmail.com]

Nikos -

Thank you for your feedback.  I tried a converter earlier in the debugging process and came across another error, but will revisit to see if I can get it to work.  I will let you know what the result is.  THANKS!!!

[dhook.donald.hook.gmail.com]

Nikos - I ended up using the synthetic property that you mentioned since the convertNumber did not work since I was trying to display a space for a value that had zero.  I have since implemented a selectOneMenu which works well.  Thanks again for your guidance!