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.

        Iterator iter = symbols.iterator();
        while (iter.hasNext()) {
            SingleElementSymbol symbol = (SingleElementSymbol)iter.next();
            String name = symbol.getName();
            if (symbol instanceof AliasSymbol) {
                AliasSymbol alias = (AliasSymbol)symbol;
                symbol = alias.getSymbol();
            }
            if (symbol instanceof ElementSymbol) {
                ElementSymbol element = (ElementSymbol)symbol;
                GroupSymbol group = element.getGroupSymbol();
                Object groupID = null;

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  public static final Select sample2() { 
      Select select = new Select();
      select.addSymbol(new ElementSymbol("a"));   //$NON-NLS-1$
      select.addSymbol(new ElementSymbol("b"));   //$NON-NLS-1$
      select.addSymbol(new ElementSymbol("c")); //$NON-NLS-1$
      select.addSymbol(new AliasSymbol("Z", new ElementSymbol("ZZ 9 Plural Z Alpha"))); //$NON-NLS-1$ //$NON-NLS-2$
      return select;  
  }

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public class TestAliasSymbol extends TestCase {


    public void testAliasEquals() {
        AliasSymbol a1 = new AliasSymbol("X", new ExpressionSymbol("x", new Constant(1))); //$NON-NLS-1$ //$NON-NLS-2$
        AliasSymbol a2 = new AliasSymbol("X", new ExpressionSymbol("x", new Constant(2))); //$NON-NLS-1$ //$NON-NLS-2$
        AliasSymbol a3 = new AliasSymbol("x", new ExpressionSymbol("x", new Constant(1))); //$NON-NLS-1$ //$NON-NLS-2$
        
        assertEquals(a1, a3); //just a different case for the alias
        
        assertFalse(a1.equals(a2)); //different express 
    }

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        assertFalse(a1.equals(a2)); //different express 
    }
    
    public void testClone() {
        AliasSymbol a1 = new AliasSymbol("X", new ExpressionSymbol("x", new Constant(1))); //$NON-NLS-1$ //$NON-NLS-2$
        a1.setOutputName("foo"); //$NON-NLS-1$
        AliasSymbol clone = (AliasSymbol)a1.clone();
        assertEquals(a1, clone);
        assertEquals(a1.getOutputName(), clone.getOutputName());
    }

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    } else {
        replacmentSymbol = new ExpressionSymbol(ses.getShortName(), replacement);
    }
    
    if (alias && createAliases() && !replacmentSymbol.getShortCanonicalName().equals(ses.getShortCanonicalName())) {
        replacmentSymbol = new AliasSymbol(ses.getShortName(), replacmentSymbol);
    }
    return replacmentSymbol;
  }

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  public void testVisitOrderBy() { 
      OrderBy ob = new OrderBy();
      ob.addVariable(exampleElement(true, 0));
      ob.addVariable(exampleElement(true, 1));
      ob.addVariable(new AliasSymbol("abc", exampleElement(true, 2))); //$NON-NLS-1$
      helpTest(ob, getSymbolMap());      
  }

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    update.setCriteria(new CompareCriteria(exampleElement(true, 2), CompareCriteria.LT, new Constant("xyz"))); //$NON-NLS-1$
    helpTest(update, getSymbolMap());
  }


  public void testVisitAliasSymbol() {
    AliasSymbol as = new AliasSymbol("abc", exampleElement(true, 0)); //$NON-NLS-1$
    helpTest(as, getSymbolMap());
  }

View Full Code Here

  }


  public void testOrderBy2() {
    OrderBy ob = new OrderBy();
    ob.addVariable(new ElementSymbol("e1")); //$NON-NLS-1$
    ob.addVariable(new AliasSymbol("x", new ElementSymbol("e2"))); //$NON-NLS-1$ //$NON-NLS-2$
    
    helpTest(ob, "ORDER BY e1, x");     //$NON-NLS-1$
  }

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    AggregateSymbol agg = new AggregateSymbol("abc", NonReserved.MAX, false, new Constant("abc")); //$NON-NLS-1$ //$NON-NLS-2$
    helpTest(agg, "MAX('abc')"); //$NON-NLS-1$
  }
  
  public void testAliasSymbol1() {
      AliasSymbol as = new AliasSymbol("x", new ElementSymbol("y")); //$NON-NLS-1$ //$NON-NLS-2$
      helpTest(as, "y AS x"); //$NON-NLS-1$
  }

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      helpTest(as, "y AS x"); //$NON-NLS-1$
  }


  // Test alias symbol with reserved word 
  public void testAliasSymbol2() {
      AliasSymbol as = new AliasSymbol("select", new ElementSymbol("y")); //$NON-NLS-1$ //$NON-NLS-2$
      helpTest(as, "y AS \"select\""); //$NON-NLS-1$
  }

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