01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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: 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: if (_parent instanceof ManyToOneExpr) {
60: // jpa/0h1c
61: return false;
62: }
63:
64: FromItem fromItem = _parent.getChildFromItem();
65:
66: // ejb/0j00 vs ejb/0h13 vs ejb/0t00
67: if (type == IS_INNER_JOIN)
68: return (from == fromItem);
69: else
70: return false;
71: }
72:
73: /**
74: * Replaces linked join to eliminate a table.
75: */
76: public AmberExpr replaceJoin(JoinExpr join) {
77: return join.replace(this);
78: }
79: }
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