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 Rodrigo Westrupp
27: */
28:
29: package com.caucho.amber.expr.fun;
30:
31: import com.caucho.amber.query.QueryParser;
32: import com.caucho.amber.expr.AmberExpr;
33: import com.caucho.amber.type.*;
34: import com.caucho.util.L10N;
35:
36: import java.util.ArrayList;
37:
38: /**
39: * SUM() function expression
40: */
41: public class SumFunExpr extends FunExpr {
42: private static final L10N L = new L10N(SumFunExpr.class);
43:
44: private AmberExpr _arg;
45:
46: /**
47: * Creates a new function expression
48: */
49: protected SumFunExpr(QueryParser parser, String id,
50: ArrayList<AmberExpr> args, boolean distinct) {
51: super (parser, id, args, distinct);
52:
53: // XXX: needs to throw IllegalArgument for empty args
54: _arg = args.get(0);
55: }
56:
57: public static SumFunExpr create(QueryParser parser, String id,
58: ArrayList<AmberExpr> args, boolean distinct) {
59: return new SumFunExpr(parser, id, args, distinct);
60: }
61:
62: /**
63: * Returns the expr type.
64: */
65: public Type getType() {
66: // int/Integer -> Long and float/Float -> Double
67: Type argType = _arg.getType();
68:
69: if ((argType instanceof IntegerType)
70: || (argType instanceof PrimitiveIntType))
71: return LongType.create();
72:
73: if ((argType instanceof FloatType)
74: || (argType instanceof PrimitiveFloatType))
75: return DoubleType.create();
76:
77: return argType;
78: }
79: }
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