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


1 /*
2  * Copyright (c) 1998-2004 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 SoftwareFoundation, 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.query;
30
31 import com.caucho.amber.table.Column;
32
33 /**
34  * Bound identifier expression.
35  */
36 public class KeyColumnExpr extends ColumnExpr {
37   /**
38    * Creates a new unbound id expression.
39    */
40   public KeyColumnExpr(PathExpr parent, Column column)
41   {
42     super(parent, column);
43   }
44
45   /**
46    * Binds the expression as a select item.
47    */
48   /*
49   public AmberExpr bindSelect(QueryParser parser)
50   {
51     return this;
52   }
53   */
54
55   /**
56    * Returns true if the expression uses the from item.
57    */
58   public boolean usesFrom(FromItem from, int type, boolean isNot)
59   {
60     FromItem fromItem = _parent.getChildFromItem();
61     
62     // ejb/0j00 vs ejb/0h13
63 if (type == IS_INNER_JOIN)
64       return (from == _fromItem);
65     else
66       return false;
67   }
68
69   /**
70    * Replaces linked join to eliminate a table.
71    */
72   public AmberExpr replaceJoin(JoinExpr join)
73   {
74     return join.replace(this);
75   }
76 }
77
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