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Java > Open Source Codes > com > caucho > amber > expr > KeyColumnExpr


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free Software Foundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.amber.expr;
30
31 import com.caucho.amber.query.FromItem;
32 import com.caucho.amber.table.Column;
33
34 /**
35  * Bound identifier expression.
36  */
37 public class KeyColumnExpr extends ColumnExpr {
38   /**
39    * Creates a new unbound id expression.
40    */
41   public KeyColumnExpr(PathExpr parent, Column column)
42   {
43     super(parent, column);
44   }
45
46   /**
47    * Binds the expression as a select item.
48    */
49   /*
50   public AmberExpr bindSelect(QueryParser parser)
51   {
52     return this;
53   }
54   */
55
56   /**
57    * Returns true if the expression uses the from item.
58    */
59   public boolean usesFrom(FromItem from, int type, boolean isNot)
60   {
61     FromItem fromItem = _parent.getChildFromItem();
62
63     // ejb/0j00 vs ejb/0h13 vs ejb/0t00
64 if (type == IS_INNER_JOIN)
65       return (from == fromItem);
66     else
67       return false;
68   }
69
70   /**
71    * Replaces linked join to eliminate a table.
72    */
73   public AmberExpr replaceJoin(JoinExpr join)
74   {
75     return join.replace(this);
76   }
77 }
78
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