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

org.teiid.query.sql.symbol.AliasSymbol
An AliasSymbol wraps a SingleElementSymbol and changes it's name. AliasSymbols should be used to perform the aliasing of elements in a SELECT clause. They should typically NOT be used elsewhere in a query. The alias symbol takes on the type of it's underlying SingleElementSymbol. AliasSymbols are typically applied to ElementSymbol, ExpressionSymbol, and AggregateSymbol.

  private void updateSymbolName(List<SingleElementSymbol> projectCols, int i,
      ElementSymbol virtualElem, SingleElementSymbol projectedSymbol) {
    if (projectedSymbol instanceof AliasSymbol) {
      ((AliasSymbol)projectedSymbol).setShortName(virtualElem.getShortCanonicalName());
    } else {
      projectCols.set(i, new AliasSymbol(virtualElem.getShortCanonicalName(), projectedSymbol));
    }
  }

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                        SingleElementSymbol oldSes = oldProjectSymbols.get(i);
                        if (newSes instanceof ExpressionSymbol || !newSes.getShortCanonicalName().equals(oldSes.getShortCanonicalName())) {
                            if (newSes instanceof AliasSymbol) {
                                newSes = ((AliasSymbol)newSes).getSymbol();
                            }
                            newProjectSymbols.set(i, new AliasSymbol(oldSes.getShortName(), newSes));
                        }
                    }
                    
                    PlanNode sort = NodeEditor.findParent(firstProject, NodeConstants.Types.SORT, NodeConstants.Types.SOURCE);

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              if (metadataParameter.getParameterType()==ParameterInfo.INOUT) {
                  aliasName += "_IN"; //$NON-NLS-1$
              }
              
              SingleElementSymbol newSymbol = new AliasSymbol(aliasName, new ExpressionSymbol(paramSymbol.getShortName(), ref));
              
              select.addSymbol(newSymbol);
              accessPatternElementNames.add(queryName + ElementSymbol.SEPARATOR + aliasName);
          }
      }

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                } catch (QueryResolverException err) {
                    throw new TeiidRuntimeException(err);
                }
                
                if (!(originalSymbol instanceof ExpressionSymbol)) {
                    symbol = new AliasSymbol(originalSymbol.getShortName(), symbol);
                } 
            }
            newProject.add(symbol);
        }
        return newProject;

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    @Override
    public void visit( OrderByItem obj ) {
        SingleElementSymbol ses = obj.getSymbol();
        if (ses instanceof AliasSymbol) {
            AliasSymbol as = (AliasSymbol)ses;
            outputDisplayName(as.getOutputName());
        } else {
            visitNode(ses);
        }
        if (!obj.isAscending()) {
            append(SPACE);

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                newSymbol = (SingleElementSymbol)expr; 
            }
                        
            symbols.put(symbol, newAlias);
            if (visitor.namingContext.aliasColumns && needsAlias) {
                newSymbol = new AliasSymbol(symbol.getShortName(), newSymbol);
                newSymbol.setOutputName(newAlias);
            } 
            selectSymbols.set(i, newSymbol);
        }

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              } else if (expr instanceof ElementSymbol) {
                needsAlias &= needsAlias(name, (ElementSymbol)expr);
              } 
                          
              if (needsAlias) {
                  element = new AliasSymbol(element.getShortName(), (SingleElementSymbol)expr);
              } else if (expr instanceof ElementSymbol) {
                element = (ElementSymbol)expr;
                visitNode(element);
              }
              item.setSymbol(element);

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              }
              ElementSymbol es = (ElementSymbol)ses;
              if (!useName) {
                bindings.add(sourceNode.getMappedSymbol(es).toString());
              } else {
                bindings.add(new AliasSymbol(name, sourceNode.getMappedSymbol(es)).toString());
              }
            }
            modifiedNode.setBindings(bindings);
        }
    }

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            if (projectedSymbols.contains(symbol)) {
                mappedElements.put(symbol, new ElementSymbol(groupName + ElementSymbol.SEPARATOR + symbol.getShortName()));
                continue;
            }
            AliasSymbol alias = getMachingAlias(projectedSymbols, symbol);
            if (alias != null) {
                mappedElements.put(symbol, new ElementSymbol(groupName + ElementSymbol.SEPARATOR + alias.getShortName()));
                continue;
            }
            // this means that the criteria symbol, is not projected, so add the element symbol
            // to query node, so that it is projected.
            
            String name = getNewSymbolName(newGroupSymbol.getName(), symbol, symbolMap);
            
            AliasSymbol selectSymbol = new AliasSymbol(name, symbol);
            
            transformationQuery.getSelect().addSymbol(selectSymbol);
            addedProjectedSymbol = true;


            // also add to the projected elements on the temp group.
            metadata.getMetadataStore().addElementSymbolToTempGroup(newGroupSymbol.getName(), selectSymbol);
            
            ElementSymbol upperSymbol = new ElementSymbol(groupName + ElementSymbol.SEPARATOR + selectSymbol.getShortName());
            mappedElements.put(symbol, upperSymbol);
            
            //add to the symbol map.  the base symbol is not to the original group, since it doesn't really project this element 
            symbolMap.put(upperSymbol, upperSymbol); 
        }

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    private AliasSymbol getMachingAlias(List elementsInGroup, ElementSymbol symbol) {
        
        for(Iterator i = elementsInGroup.iterator(); i.hasNext();) {
            final SingleElementSymbol element = (SingleElementSymbol)i.next();
            if (element instanceof AliasSymbol) {
                AliasSymbol alias = (AliasSymbol)element;
                if (alias.getSymbol().equals(symbol)) {
                    return alias;
                }
            }
        }
        return null;

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