How to combine a content search with an attribute search with the API

Question

Hi
I have been working with searches in Content Services using the API and I have successfully set up the search over the contents of a document and inside of the Category attributes of the document.
My problem comes when I try to combine this 2 kinds of search, that is when I want to find all the documents that cointain the text "test" and at the same time contain other text into their category attributes.
What I do is to build 2 SearchExpression's one for the content search and the other for the attributes search and then joining them in a third SearchExpression object using the FdkConstants.OPERATOR_AND. When I search using only the first or the second SearchExpression everything works fine. But when I do the search using the third SearchExpression an ORACLE.FDK.ParameterError:ORACLE.FDK.InvalidSearchExpression
exception id raised.
The code I'm using is like this:
private SearchExpression getMainSE(String contentQuery, CategoryInfo catInfo)
     SearchExpression contentSE = null;
     SearchExpression catSE = null;
     SearchExpression mainSE = null;
     if(contentQuery != null)
          contentSE = this.setupSE4Contents(contentQuery);
     if(catInfo != null)
          catSE = this.setupSE4Category(catInfo);
     if(contentSE != null && catSE != null)
          mainSE = new SearchExpression();
          mainSE.setLeftOperand(FdkConstants.OPERATOR_AND);
          mainSE.setLeftOperand(catSE);
          mainSE.setRightOperand(contentSE);
     else
          mainSE = contentSE != null ? contentSE : catSE;
     return mainSE;
CategoryInfo is one class made by my own that contains the categoryId of the document and a List of the attributes where I want to search. mainSE is the SearchExpression that is returned.The portion of code that appears to be having problems is this:
if(contentSE != null && catSE != null)
     mainSE = new SearchExpression();
     mainSE.setLeftOperand(FdkConstants.OPERATOR_AND);
     mainSE.setLeftOperand(catSE);
     mainSE.setRightOperand(contentSE);
And finally I only execute the search using the mainSE returned by the function:
// Define search options
NamedValue[] nv = WsUtility.newNamedValueArray(new Object[][] {
     { Options.FOLDER_RESTRICTION,
          folder != null ? new Long(folder.getId()) : null },
     { Options.SEARCH_VERSION_HISTORY, Boolean.TRUE } });
     SearchExpression mainSE = this.getMainSE(contentQuery, catInfo);
     try
          // Search documents
          NamedValue[] result = sem.search(mainSE, nv, null);
          // etc....
Is this the correct way to combine a content search with an attribute search???
I know that this is possible since I have seen that it can be done in the Collaboration Suite UI.
I hope yoy can help me...
Thanks in advance

Answer 1

Not sure if this is a typo (while pasting code on the forum) or is the cause of the problem you describe.
Shouldn't mainSE.setLeftOperand(FdkConstants.AND) be replaced by mainSE.setOperator(FdkConstants.AND) ?
Ravikiran