Examples of org.teiid.query.sql.symbol.Reference

org.teiid.query.sql.symbol.Reference
This class represents a reference (positional from the user query, or to an element from another scope). This reference may resolve to many different values during evaluation. For any particular bound value, it is treated as a constant.

  
  @Test public void testEvaluatedSetCriteria() throws Exception {
    DependentAccessNode dan = new DependentAccessNode(0);
    CommandContext cc = new CommandContext();
    dan.setContext(cc);
    List<Reference> references = Arrays.asList(new Reference(1), new Reference(2));
    for (Reference reference : references) {
      cc.getVariableContext().setGlobalValue(reference.getContextSymbol(), 1);
    }
    SetCriteria sc = new SetCriteria(new ElementSymbol("e1"), references); //$NON-NLS-1$
    DependentCriteriaProcessor dcp = new DependentCriteriaProcessor(1, -1, dan, sc);

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        insert.setGroup(new GroupSymbol("m.g")); //$NON-NLS-1$
        List vars = new ArrayList();
        vars.add(new ElementSymbol("a"));         //$NON-NLS-1$
        insert.setVariables(vars);
        List values = new ArrayList();
        values.add(new Reference(0));
        insert.setValues(values);
        Option option = new Option();
        option.setNoCache(true);       
        insert.setOption(option);
        TestParser.helpTest("INSERT INTO m.g (a) VALUES (?) OPTION NOCACHE",  //$NON-NLS-1$

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    }
    
    @Test public void testUpdateWithOption() {
        Update update = new Update();     
        update.setGroup(new GroupSymbol("m.g")); //$NON-NLS-1$
        update.addChange(new ElementSymbol("a"), new Reference(0));
        Option option = new Option();
        option.setNoCache(true);
        Criteria crit = new CompareCriteria(new ElementSymbol("b"), CompareCriteria.EQ, new Reference(1)); //$NON-NLS-1$
        update.setCriteria(crit);
        TestParser.helpTest("UPDATE m.g SET a = ? WHERE b = ? OPTION NOCACHE",  //$NON-NLS-1$
                 "UPDATE m.g SET a = ? WHERE b = ? OPTION NOCACHE",  //$NON-NLS-1$
                 update);                     
    }

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            findInputNodes(inputSymbols, critNode, conjuncts, coveredParams);
            
            List defaults = new LinkedList();
            
            for (Iterator params = inputReferences.iterator(); params.hasNext();) {
                Reference ref = (Reference)params.next(); 
                ElementSymbol symbol = ref.getExpression();
                
                Expression defaultValue = null;
                
                /*try {
                    defaultValue = ResolverUtil.getDefault(symbol, metadata);

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                boolean checkForInput(Expression expr) {
                    if (!(expr instanceof Reference)) {
                        return false;
                    }
                    //if the expr is a function containing a reference should give a warning
                    Reference ref = (Reference)expr;
                    return inputs.contains(ref.getExpression());
                }
                
        boolean checkForAnyInput(LanguageObject expr) {
                  for (Reference ref : ReferenceCollectorVisitor.getReferences(expr)) {
                        if (checkForInput(ref)) {

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      PreparedPlan pPlan = cache.get(new CacheID(token2, pi, EXAMPLE_QUERY + 12));
      assertNotNull("Unable to get prepared plan from cache", pPlan); //$NON-NLS-1$
      assertEquals("Error getting plan from cache", new RelationalPlan(new ProjectNode(12)).toString(), pPlan.getPlan().toString()); //$NON-NLS-1$
      assertEquals("Error getting command from cache", EXAMPLE_QUERY + 12, pPlan.getCommand().toString()); //$NON-NLS-1$
      assertNotNull("Error getting plan description from cache", pPlan.getAnalysisRecord()); //$NON-NLS-1$
      assertEquals("Error gettting reference from cache", new Reference(1), pPlan.getReferences().get(0)); //$NON-NLS-1$
    }

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        pPlan.setCommand(dummy); 
        pPlan.setPlan(new RelationalPlan(new ProjectNode(i)), new CommandContext());
            AnalysisRecord analysisRecord = new AnalysisRecord(true, false);
        pPlan.setAnalysisRecord(analysisRecord);
        ArrayList<Reference> refs = new ArrayList<Reference>();
        refs.add(new Reference(1));
        pPlan.setReferences(refs);
      }
    }

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      this.refs = refs;
    }
    
    public Expression replaceExpression(Expression element) {
      if (element instanceof Reference) {
        Reference r = (Reference)element;
        Expression ex = refs.getMappedExpression(r.getExpression());
        if (ex != null) {
          if (ex instanceof ElementSymbol) {
            ElementSymbol es = (ElementSymbol) ex.clone();
            es.setIsExternalReference(false);
            ex = es;

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        }
        
        if (insert.getQueryExpression() != null && metadata.isVirtualGroup(insert.getGroup().getMetadataID())) {
          List<Reference> references = new ArrayList<Reference>(insert.getVariables().size());
          for (int i = 0; i < insert.getVariables().size(); i++) {
            Reference ref = new Reference(i);
            ref.setType(((ElementSymbol)insert.getVariables().get(i)).getType());
        references.add(ref);
      }
          insert.setValues(references);
        }
    }

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            QueryNode modifiedNode = new QueryNode(null);
            modifiedNode.setCommand(contextQuery);
            
            for (Iterator<Reference> i = bindings.iterator(); i.hasNext();) {
                Reference ref = i.next();
                modifiedNode.addBinding(ref.getExpression().toString());
            }
            
            GroupSymbol groupSymbol = QueryUtil.createResolvedGroup(rsInfo.getResultSetName(), planEnv.getGlobalMetadata());
            planEnv.addQueryNodeToMetadata(groupSymbol.getMetadataID(), modifiedNode);
        }

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