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.fun;
30:
31: import com.caucho.amber.expr.AmberExpr;
32: import com.caucho.amber.query.QueryParser;
33: import com.caucho.util.CharBuffer;
34: import com.caucho.util.L10N;
35:
36: import java.util.ArrayList;
37:
38: /**
39: * LOWER function expression
40: */
41: public class LowerFunExpr extends FunExpr {
42: private static final L10N L = new L10N(LowerFunExpr.class);
43:
44: /**
45: * Creates a new expression
46: */
47: protected LowerFunExpr(QueryParser parser, ArrayList<AmberExpr> args) {
48: super (parser, "lower", args, false);
49: }
50:
51: public static FunExpr create(QueryParser parser,
52: ArrayList<AmberExpr> args) {
53: return new LowerFunExpr(parser, args);
54: }
55:
56: /**
57: * Generates the where expression.
58: */
59: public void generateWhere(CharBuffer cb) {
60: generateInternalWhere(cb, true);
61: }
62:
63: /**
64: * Generates the (update) where expression.
65: */
66: public void generateUpdateWhere(CharBuffer cb) {
67: generateInternalWhere(cb, false);
68: }
69:
70: //
71: // private/protected
72:
73: void generateInternalWhere(CharBuffer cb, boolean select) {
74: ArrayList<AmberExpr> args = getArgs();
75:
76: int n = args.size();
77:
78: // XXX: this validation should be moved to QueryParser
79: // if (n != 1)
80: // throw new QueryParseException(L.l("expected 1 string argument for LOWER"));
81:
82: cb.append("lower(");
83:
84: if (select)
85: args.get(0).generateWhere(cb);
86: else
87: args.get(0).generateUpdateWhere(cb);
88:
89: cb.append(")");
90: }
91: }
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