SelectExpression


1   // $Id: SelectExpression.java,v 1.1 2005/07/12 20:27:16 steveebersole Exp $
2   package org.hibernate.hql.ast.tree;
3   
4   import org.hibernate.type.Type;
5   
6   import antlr.SemanticException;
7   
8   /**
9    * Represents an element of a projection list, i.e. a select expression.
10   *
11   * @author josh Sep 21, 2004 9:00:13 PM
12   */
13  public interface SelectExpression {
14      /**
15       * Returns the data type of the select expression.
16       *
17       * @return The data type of the select expression.
18       */
19      Type getDataType();
20  
21      /**
22       * Appends AST nodes that represent the columns after the current AST node.
23       * (e.g. 'as col0_O_')
24       *
25       * @param i The index of the select expression in the projection list.
26       */
27      void setScalarColumnText(int i) throws SemanticException;
28  
29      /**
30       * Returns the FROM element that this expression refers to.
31       *
32       * @return The FROM element.
33       */
34      FromElement getFromElement();
35  
36      /**
37       * Returns true if the element is a constructor (e.g. new Foo).
38       *
39       * @return true if the element is a constructor (e.g. new Foo).
40       */
41      boolean isConstructor();
42  
43      /**
44       * Returns true if this select expression represents an entity that can be returned.
45       *
46       * @return true if this select expression represents an entity that can be returned.
47       */
48      boolean isReturnableEntity() throws SemanticException;
49  
50      /**
51       * Sets the text of the node.
52       *
53       * @param text the new node text.
54       */
55      void setText(String   text);
56  
57      boolean isScalar() throws SemanticException;
58      
59      void setAlias(String   alias);
60      String   getAlias();
61  }
62
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