Examples of org.teiid.query.sql.visitor.FunctionCollectorVisitor

org.teiid.query.sql.visitor.FunctionCollectorVisitor

This visitor class will traverse a language object tree and collect all Function references it finds. It uses a collection to collect the Functions in so different collections will give you different collection properties - for instance, using a Set will remove duplicates.

This visitor can optionally collect functions of only a specific name

The easiest way to use this visitor is to call the static methods which create the visitor (and possibly the collection), run the visitor, and return the collection. The public visit() methods should NOT be called directly.

        // Validate use of 'rowlimit' or 'rowlimitexception' pseudo-function - each occurrence must be in a single
        // CompareCriteria which is entirely it's own conjunct (not OR'ed with anything else)
        if (isXML) {
            // Collect all occurrances of rowlimit and rowlimitexception functions
            List<Function> rowLimitFunctions = new ArrayList<Function>();
            FunctionCollectorVisitor visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMIT);
            PreOrderNavigator.doVisit(obj, visitor); 
            visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMITEXCEPTION);
            PreOrderNavigator.doVisit(obj, visitor);
            final int functionCount = rowLimitFunctions.size();
            if (functionCount > 0) {
                
                // Verify each use of rowlimit function is in a compare criteria that is

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    }
    
    private void validateRowLimitFunctionNotInInvalidCriteria(Criteria obj) {
        // Collect all occurrances of rowlimit and rowlimitexception functions
        List<Function> rowLimitFunctions = new ArrayList<Function>();
        FunctionCollectorVisitor visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMIT);
        PreOrderNavigator.doVisit(obj, visitor);      
        visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMITEXCEPTION);
        PreOrderNavigator.doVisit(obj, visitor); 
        if (rowLimitFunctions.size() > 0) {
            handleValidationError(QueryPlugin.Util.getString("ValidationVisitor.3"), obj); //$NON-NLS-1$
        }
    }

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        // Validate use of 'rowlimit' and 'rowlimitexception' pseudo-functions - they cannot be nested within another
        // function, and their operands must be a nonnegative integers


        // Collect all occurrences of rowlimit function
        List rowLimitFunctions = new ArrayList();
        FunctionCollectorVisitor visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMIT);
        PreOrderNavigator.doVisit(obj, visitor);   
        visitor = new FunctionCollectorVisitor(rowLimitFunctions, FunctionLibrary.ROWLIMITEXCEPTION);
        PreOrderNavigator.doVisit(obj, visitor);            
        final int functionCount = rowLimitFunctions.size();
        if (functionCount > 0) {
            Function function = null;
            Expression expr = null;

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Related Classes of org.teiid.query.sql.visitor.FunctionCollectorVisitor

org.teiid.query.validator.ValidationVisitor

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